Product overview of LT1013IN8
The LT1013IN8 is a dual precision operational amplifier from Analog Devices Inc., supplied in an 8‑lead PDIP package. It belongs to the LT1013/LT1014 family, where LT1013 is the dual version and LT1014 is the quad version.
LT1013IN8 is positioned as a general-purpose precision amplifier that directly upgrades widely used dual op amps such as the MC1458/MC1558, LM158 and OP‑221, while preserving the industry-standard 8‑pin configuration. It is designed for both dual-supply (for example ±15 V) and single‑supply operation down to 5 V and even lower, and it supports input common-mode operation including ground, with an output that can swing to within a few millivolts of ground while sinking load current.
Typical target uses of the LT1013IN8 include battery-powered precision instrumentation, strain gauge signal conditioning, thermocouple amplification, instrumentation amplifiers, 4 mA to 20 mA current loop transmitters, multiple threshold detection circuits, active filters, and multiple gain stages in low-power systems.
Within the LT1013/LT1014 family, the LT1013IN8 variant corresponds to the dual op amp implemented in an 8‑pin narrow PDIP, offering a balance between precision analog performance, established pinout compatibility, and straightforward through-hole assembly.
Architectural features of LT1013IN8 precision dual op amp
The LT1013IN8 implements two precision op amp circuits in a single 8‑pin package. Architecturally, it is designed as an upgrade to traditional single-supply and dual-supply dual op amps, providing enhanced DC precision, improved gain, and robust single-supply behavior.
Key architectural and feature points of LT1013IN8 include:
– Single-supply operation
The LT1013IN8 is fully specified for operation with a single positive supply and ground as the negative rail. With a single 5 V supply, the input common-mode voltage range includes ground, and the output can swing to within a few millivolts of ground while sinking current. This behavior directly addresses earlier-generation single-supply devices that either could not approach ground at the output or could not sink meaningful current near ground.
– Precision DC characteristics
The LT1013 family offers guaranteed maximum input offset voltage of 150 µV, guaranteed low drift of 2 µV/°C, and guaranteed maximum input offset current of 0.8 nA. High open‑loop gain is specified, with minimum values of 1.5 million at 5 mA load current and 0.8 million at 17 mA load current. These metrics allow LT1013IN8 to serve effectively in precision measurement and conditioning chains, especially where trimming or offset null pins are not used.
– Output stage and load driving
The LT1013IN8 employs an all-NPN output stage which maintains low output resistance and high gain characteristics up to saturation, and which can source and sink load currents well in excess of those provided by many classical low-power devices. Compared with older single‑supply op amps whose outputs either stay significantly above ground or sink only microampere-level currents, the LT1013IN8 can handle practical loads at low output voltages.
– Pin-compatible precision upgrade
LT1013, including the LT1013IN8, is pin-compatible with popular 8‑pin dual op amps, so existing designs using devices like MC1458/MC1558, LM158, or OP‑221 can often be upgraded with minimal layout changes. This compatibility enables higher precision and better temperature stability without redesigning the PCB.
– Family relationship with LT1014
The LT1014 is a quad precision op amp in a 14‑pin DIP (and other packages) that similarly upgrades LM324/LM348/OP‑11/4156 pinouts. LT1013IN8 shares the same precision core as this quad, with similar or slightly better key parameters, making it suitable where two channels are required per package.
– Protection and special internal circuitry
The LT1013IN8 incorporates internal 400 Ω series resistors at each input, protecting the input structure against conditions where the input voltage falls several volts below the negative supply. Additionally, it includes specific circuitry to prevent phase reversal at the output when inputs go outside the nominal common-mode range in single-supply use.
As an example, a design that previously used LM158 in a single-supply battery-powered sensor interface can usually substitute LT1013IN8 to reduce offset error and temperature drift while maintaining the same footprint and overall biasing concept.
Electrical performance characteristics of LT1013IN8
The LT1013/LT1014 family is extensively characterized at both ±15 V and single 5 V operation. While detailed tables contain numerous parameters, several groups of characteristics summarize how LT1013IN8 behaves in typical applications.
– Supply voltage capability and limits
Absolute maximum supply voltage is ±22 V. The LT1013IN8 is specified for operation at ±15 V and single 5 V supplies, and applications information notes correct operation at total supply voltages down to approximately 3.4 V. Differential input voltage can go up to ±30 V, and input voltage can equal the positive supply and go as low as 5 V below the negative supply under specified conditions.
– Offset voltage and drift
The guaranteed maximum input offset voltage is 150 µV. Typical offset for the family is much lower, and the LT1014 distribution of offset voltage illustrates that many devices fall well within the guarantee limit. Offset drift is guaranteed to be no more than 2 µV/°C, with typical drift around 0.3 µV/°C for the quad, and the LT1013 is similar or slightly better. This low drift supports applications such as thermocouple or strain gauge amplifiers where small DC shifts over temperature directly affect measurement accuracy.
– Input bias and offset current
Input offset current is guaranteed at 0.8 nA maximum. Typical bias currents are low enough to allow accurate interfacing to high-impedance sensors and precision resistor networks, especially when bias-current cancellation techniques are employed, as shown in some typical applications using multiple op amp stages.
– Open-loop gain and linearity
The LT1013 family guarantees high open‑loop gain: at a 5 mA load current, the minimum gain is 1.5 million, and at 17 mA load, at least 0.8 million. Such high DC gain directly translates to low gain error in closed-loop configurations. In dual-supply operation, the output stage is designed to be crossover-distortion free, which benefits precision AC and low-frequency signal paths.
– Noise characteristics
For low‑frequency precision applications, the LT1013 offers low voltage noise of 0.55 µV peak‑to‑peak in the 0.1 Hz to 10 Hz band. Its current noise is specified as 0.07 pA/√Hz, better than certain well-known low-noise amplifiers such as the OP‑07 in this aspect. These characteristics suit instrumentation amplifiers, sensor front ends, and active filters where low noise at low frequency is required.
– Supply current
The LT1013 specifies a maximum supply current of 500 µA per amplifier in the family overview. At low supply voltages such as 3.4 V, typical current is around 290 µA per amplifier. This low quiescent consumption enables the LT1013IN8 to be used in battery-powered instruments over long lifetimes.
– Temperature ranges
Different device grades in the LT1013 family support varying operating temperature ranges. LT1013AM/LT1013M devices cover −55 °C to 125 °C, LT1013I covers −40 °C to 85 °C, and LT1013AC/LT1013C/LT1013D devices are specified from 0 °C to 70 °C. LT1013IN8 corresponds to a PDIP dual variant aligned with these grade options. Storage temperature range is −65 °C to 150 °C.
– Short-circuit behavior
Outputs can be shorted indefinitely without damage, as the output short‑circuit duration is specified as “indefinite” under the absolute maximum ratings, indicating robust current-limiting and thermal capability within the package’s thermal limits.
In a real circuit such as a 4 mA to 20 mA transmitter, these performance characteristics allow LT1013IN8 to maintain loop current accuracy across temperature and supply variations, while keeping total power consumption controlled.
Single-supply behavior and protection mechanisms in LT1013IN8
The LT1013IN8 is designed so that single-supply operation is a first-class mode of use, not just an afterthought. Two sets of issues are specifically addressed: how the input behaves when it goes below ground, and how the output behaves near ground.
– Input common-mode range and below-ground conditions
The LT1013IN8’s input common-mode range includes ground when the negative supply is at 0 V. However, in many applications (for example, sensor inputs or transient conditions), the input may dip below ground. Earlier single-supply op amps such as LM124, LM158, OP‑20, OP‑21, OP‑220, OP‑221 and OP‑420 could encounter two distinct problems in such situations:
1) When the input went more than a diode drop below ground, large currents could flow from the substrate (negative supply) to the input, potentially damaging the device.
2) When the input was more than approximately 400 mV below ground, the input stage could saturate and cause phase reversal at the output, potentially leading to servo lock-up or incorrect control action.
The LT1013IN8 addresses both points.
– Input protection using 400 Ω series resistors
Each input of the LT1013/LT1014 family includes a 400 Ω series resistor, as shown in the internal schematic. This resistor limits fault current when the input voltage falls below ground. According to the applications information, LT1013/LT1014 devices are protected even when the input is 5 V below ground. This directly simplifies interface design when inputs might see under‑range signals, cable transients, or miswiring.
– Phase-reversal protection
The LT1013/LT1014 includes a unique phase reversal protection network (devices identified as Q21, Q22, Q27, Q28 in the internal schematic). With this circuitry, the LT1013IN8 output does not reverse phase even when inputs are driven to −1.5 V under single-supply operation. In other words, instead of inverting its output when the input common-mode falls beyond the normal range, the device prevents this unintended behavior.
There is, however, a defined limitation in multi‑amp packages: phase-reversal protection does not function for a particular amplifier if another amplifier on the same die is driven hard into negative output saturation. For the LT1013 dual, each of the two amplifiers has a particular counterpart whose deep negative saturation disables that channel’s phase reversal protection. The detailed mapping is provided for the quad LT1014 (amplifiers A, B, C, D), and the concept generalizes to the dual device: some combinations of one amplifier in deep negative saturation influence the protection behavior of the other. Designers should therefore avoid operating one channel with its output heavily driven into negative saturation when the other channel may experience significant below-ground input excursions.
In practice, for a single-supply strain gauge amplifier using LT1013IN8, ensuring that both channels operate within their normal linear range (or saturate only moderately) will preserve the benefits of phase-reversal protection for inputs that may transiently undershoot ground.
– Output swing near ground and sinking ability
On the output side, traditional single-supply op amps either do not swing close to ground or cannot sink more than microampere-level current while near ground. The LT1013/LT1014 all‑NPN output stage maintains low output resistance and high open‑loop gain all the way to saturation, enabling the LT1013IN8 to swing to within a few millivolts of ground while sinking useful load currents. This behavior supports designs such as single-supply current loop drivers, low-side current sources, and ground-referenced signal acquisition circuitry.
In dual-supply configurations, the output stage is free from crossover distortion, improving linearity for AC and precision DC signals around zero.
– Use as a comparator with TTL-compatible outputs
Because of its single-supply capability and clean operation near ground, the LT1013IN8 can also be used as a precision comparator in some circuits, producing TTL-compatible output levels when powered appropriately. In mixed analog systems, this allows one package to implement both amplifier and comparator functions—for example, two channels in an LT1013IN8 might be configured as one instrumentation amplifier and one comparator-based threshold detector.
Low-voltage and low-power operation of LT1013IN8
The LT1013IN8 supports low-voltage operation with low supply current, which is useful in battery-powered and energy‑sensitive systems.
– Minimum supply voltage
Applications information specifies that the minimum supply voltage for proper operation of the LT1013/LT1014 is 3.4 V, equivalent to three Ni‑Cad cells in series. Below this level, parameters may no longer meet the stated limits. At 3.4 V, typical supply current per amplifier is around 290 µA.
– Power dissipation
At 3.4 V and 290 µA, power dissipation per amplifier is approximately 1 mW. Even at higher supply voltages, the maximum supply current of 500 µA per amplifier keeps power dissipation modest, which is advantageous in dense analog sections on a PCB and in thermally constrained environments.
A practical example is a 9 V battery-powered strain gauge signal conditioner: LT1013IN8 can form both the input bridge amplifier and the output driver while consuming only a small fraction of the total system power, prolonging battery life and reducing self‑heating that might otherwise compromise sensor accuracy.
Noise performance and measurement considerations for LT1013IN8
Noise behavior of LT1013IN8 is tailored for precision low-frequency applications.
– Voltage and current noise
In the 0.1 Hz to 10 Hz band, the LT1013/LT1014 family provides 0.55 µV peak‑to‑peak voltage noise. Current noise is around 0.07 pA/√Hz. These values are suited to low-frequency instrumentation tasks in thermocouple amplifiers, load cell signal paths, and low‑frequency active filters, where integrated noise over the measurement bandwidth directly limits resolution.
– Noise test configuration
The datasheet references a standard noise test configuration used also as a burn‑in circuit, where the op amp is operated with high closed‑loop gain and ±20 V supplies for qualification. A special note indicates that the resistor in the noise measurement setup must have low thermoelectric potential, otherwise thermal EMF can contaminate low‑level offset and noise measurements.
Although the detailed schematic is provided for LT1007/LT1008 as a reference for noise measurements, the LT1013IN8 can be evaluated using similar methods: high gain with low-noise resistors and careful thermal management. For example, in a laboratory setting where an LT1013IN8 is intended for a thermocouple amplifier, the noise test circuit can validate that its low‑frequency noise does not dominate the thermocouple’s own noise and the system resolution.
Typical application domains and design examples using LT1013IN8
The LT1013/LT1014 datasheet includes numerous typical applications illustrating the versatility of the underlying amplifier core. LT1013IN8, as the dual PDIP implementation, can be used in many of these circuits directly or with minor adaptations.
Representative application domains and examples include:
– Precision instrumentation amplifiers using LT1013IN8
Multiple schematics are presented for instrumentation amplifier configurations:
• 5 V single-supply dual instrumentation amplifier: using LT1013’s dual channels to implement an instrumentation amplifier suitable for low-voltage systems.
• 5 V powered precision instrumentation amplifier: demonstrating precision gain with ground-referenced inputs and outputs at a single 5 V supply.
• Triple op amp instrumentation amplifier with bias current cancellation: implemented with three amplifiers (e.g., two from LT1013IN8 and one additional amplifier) to reduce bias current effects.
In a real deployment, LT1013IN8 can be the core of a compact two-channel instrumentation front end, one channel per bridge or sensor, providing gain, offset adjustment, and filtering around each sensor.
– Strain gauge and bridge signal conditioning with LT1013IN8
The datasheet includes:
• 9 V battery-powered strain gauge signal conditioner: combining low power, high precision, and battery operation.
• Strain gauge bridge signal conditioner: illustrating gain setting, bridge excitation, and linear output scaling.
LT1013IN8 can be used to amplify small differential bridge outputs, reject common-mode noise, and provide the required output range for an ADC or transmitter, leveraging its low offset and drift.
– Temperature measurement and sensing with LT1013IN8
The LT1013/LT1014 is applied in multiple temperature-related circuits:
• 3-channel thermocouple thermometer: using a quad device, but conceptually implementable with one or more LT1013IN8 devices.
• 5 V powered, linearized platinum RTD signal conditioner: demonstrating linearization and gain for a PT100 or similar RTD, with specific trim procedures (zero, gain, and linearity trim at 0 °C, 100 °C, and 400 °C).
• Liquid flowmeter: combining thermistor networks and LT1013/14 amplifiers to derive flow from temperature differences.
For example, an LT1013IN8-based RTD conditioner can be built using one amplifier for excitation and one for scaling and linearization, following the reference design’s resistor ratios and trim sequence.
– Current loop transmitters using LT1013IN8
Typical applications show:
• 5 V powered 4 mA to 20 mA current loop transmitter: where LT1013 provides the control and error amplifier function.
• Fully floating modification to 4 mA to 20 mA current loop: adding isolation and floating behavior for industrial loops.
In a 4–20 mA loop design, one channel of LT1013IN8 may act as the main loop control amplifier, converting a voltage from a sensor or DAC into a loop current, while the second channel handles linearization or limit detection.
– Signal generation and control circuits with LT1013IN8
Several varied examples demonstrate flexibility:
• 50 MHz thermal RMS-to-DC converter: using LT1013/LT1014 as part of the thermal conversion chain.
• 5 V powered EEPROM pulse generator: generating precise programming pulses for nonvolatile memory.
• Methane concentration detector with linearized output: implementing sensor interface and linearization.
• Low dropout regulator for 6 V battery: using LT1013 as an error amplifier in a regulator scheme.
• Voltage-controlled current source with ground-referred input and output: using LT1013/LT1014 to control current precisely while referencing both input and output to ground.
• Low power 9 V to 5 V converter: illustrating power circuitry supervision.
• Low power, 5 V driven TXCO (temperature-compensated crystal oscillator): using LT1013/LT1014 for oscillator temperature compensation.
• Step-up switching regulator for 6 V battery: using LT1013/14 in feedback control for a DC-DC converter.
Though not all of these designs map directly into a single dual package, LT1013IN8 can be a building block in many of them. For instance, in a low dropout regulator powered by a 6 V battery, one channel of LT1013IN8 can act as the error amplifier comparing output to a reference, while the other channel provides overcurrent or undervoltage monitoring.
– Mixed amplifier/comparator usage with LT1013IN8
Single-supply operation and TTL-compatible output levels allow LT1013/LT1014 to serve as comparators, with datasheet plots showing comparator rise/fall times for various overdrives (e.g., 10 mV, 5 mV, 2 mV). In a board where discrete comparators might otherwise be needed, LT1013IN8 channels can be assigned as comparators for limit detection while other channels act as continuous-time amplifiers.
These typical circuits illustrate that LT1013IN8 can support both classic analog front-end tasks and control/utility roles in low-power and precision systems.
Package, pin configuration, and thermal characteristics of LT1013IN8
LT1013IN8 is the 8‑lead PDIP (N8 package) implementation of the LT1013 dual op amp. The datasheet provides a general note that the LT1013/LT1014 pin configuration differs from the “standard 8‑pin dual-in-line” configuration, and designers should therefore verify the pinout rather than assuming compatibility with all other dual op amps.
– Package types in the LT1013 family
While LT1013IN8 uses the N8 8‑lead PDIP, the family is available in multiple packages:
• H package 8‑lead TO‑5 metal can (0.200 inch PCD)
• J8 package 8‑lead CERDIP (narrow 0.300 inch, hermetic)
• J package 14‑lead CERDIP for the quad
• N8 package 8‑lead PDIP (narrow 0.300 inch) for LT1013
• N package 14‑lead PDIP for LT1014
• S8 package 8‑lead plastic SO (narrow 0.150 inch)
• SW package wide SO variants
Package drawings provide dimensions, including allowances for mold flash and options for pin‑1 identification via bevel or dimple. These details are relevant for mechanical layout and assembly but do not alter the electrical behavior.
– Thermal characteristics for LT1013IN8 and related packages
Thermal resistance and junction temperature limits are given for typical packages:
• For LT1013 in one package, TJMAX is 125 °C, θJA is 55 °C/W.
• For LT1014 in various packages, TJMAX is 150 °C, with θJA values such as 130 °C/W and 100 °C/W, depending on body size and construction.
For the N8 PDIP package used by LT1013IN8, the thermal resistance is similar to typical 8‑pin DIP values (as given by the general figures in the datasheet). When deployed in a standard PCB environment, this thermal performance supports operation within the specified ambient ranges under typical power dissipation (on the order of milliwatts per amplifier).
– Pin configuration note for LT1013IN8
A specific note highlights that the pin configuration “differs from the standard 8‑pin dual-in-line configuration.” This warns that the internal arrangement of non-inverting input, inverting input, and output pins for each amplifier, and their relationship to the power supply pins, should be checked carefully in the datasheet before using LT1013IN8 as a drop‑in replacement.
In a redesign scenario, for example, upgrading from a common dual op amp to LT1013IN8 for better precision requires matching each amplifier’s pins to the appropriate nodes on the PCB. This ensures that feedback networks, inputs, and outputs align correctly with the LT1013IN8 pinout and that both channels and power pins are wired as intended.
Conclusion on LT1013IN8 application suitability
LT1013IN8 integrates two precision op amps in an 8‑pin PDIP package, delivering low offset voltage, low drift, low bias current, high open‑loop gain, and low noise in a configuration that supports both dual‑supply and single‑supply operation down to about 3.4 V. Its architecture addresses classic shortcomings of earlier single-supply op amps: inputs are protected against excursions below ground, phase reversal is avoided for typical conditions, and the output stage can swing very close to ground while driving useful load currents.
The LT1013IN8’s precision parameters, coupled with low supply current, make it suited for battery-powered precision instrumentation, sensor signal conditioning, current loop transmitters, and a range of control and utility functions in analog systems. The wide range of typical application circuits—spanning instrumentation amplifiers, temperature measurement, current sources, regulators, and oscillators—demonstrates its flexibility as a general-purpose precision analog building block.
For designs that require both accuracy and energy efficiency, LT1013IN8 provides a path to upgrade legacy dual op amp designs and to implement new single-supply and mixed-supply analog subsystems with controlled error budgets and robust behavior under real‑world signal conditions.
Frequently Asked Questions (FAQ) on LT1013IN8
- Q1. What is the recommended supply voltage range for LT1013IN8?
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- A1. LT1013IN8, as part of the LT1013 family, is specified for operation on ±15 V supplies and can be used down to single-supply operation with a total supply of about 3.4 V. The absolute maximum supply voltage is ±22 V. In single‑supply configurations, it is commonly operated from 5 V, with the negative rail at 0 V, and inputs and outputs configured to operate close to ground.
- Q2. Can LT1013IN8 operate from a single 5 V supply, and how does it behave near ground?
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- A2. Yes. LT1013IN8 is fully specified for single 5 V supply operation. With VS+ = 5 V and VS− = 0 V, the input common-mode range includes ground, and the output can swing to within a few millivolts of ground while sinking current. This enables ground-referenced sensors, instrumentation amplifiers, and current sources without a negative supply.
- Q3. How does LT1013IN8 handle inputs that go below ground in single-supply operation?
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- A3. LT1013IN8 incorporates 400 Ω series resistors at each input, which protect the device when input voltages fall as much as 5 V below the negative supply (ground in single-supply mode). This limits substrate current and prevents damage. Additionally, the internal phase-reversal protection circuitry ensures that the output does not reverse phase when inputs are driven to around −1.5 V under normal conditions.
- Q4. Are there any limitations to the phase-reversal protection in LT1013IN8?
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- A4. Yes. Phase-reversal protection does not function on a given amplifier when its companion amplifier in the same package is driven hard into negative saturation at the output. In such a condition, if the protected amplifier’s input goes significantly below ground, phase reversal behavior may differ from the normal protected case. Designers should avoid operating one channel in deep negative saturation when relying on phase-reversal protection on the other channel.
- Q5. What are the typical input offset voltage and drift for LT1013IN8?
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- A5. LT1013IN8 has a guaranteed maximum input offset voltage of 150 µV. Offset voltage drift is guaranteed to be no more than 2 µV/°C, and typical drift for the family is around 0.3 µV/°C. These specifications support high-accuracy DC measurement and low error growth over temperature.
- Q6. What is the input offset current for LT1013IN8, and where does it matter?
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- A6. The LT1013 family guarantees a maximum input offset current of 0.8 nA. This low offset current is useful when interfacing to high-impedance sources, such as bridge sensors, thermistors, or resistor networks, where input bias and offset currents can generate additional errors across large source resistances.
- Q7. How much supply current does LT1013IN8 consume?
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- A7. The maximum supply current is specified as 500 µA per amplifier. At a minimum operating voltage of 3.4 V, typical supply current is about 290 µA per amplifier, resulting in roughly 1 mW power dissipation. In a dual package, the total typical current is approximately double these per‑amplifier values, making LT1013IN8 suitable for low-power designs.
- Q8. What is the noise performance of LT1013IN8?
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- A8. LT1013IN8’s noise performance, as characterized for the family, includes 0.55 µV peak‑to‑peak voltage noise in the 0.1 Hz to 10 Hz band and a current noise density of 0.07 pA/√Hz. This combination suits low-frequency, high-precision circuits such as thermocouple amplifiers, RTD conditioners, and low-frequency active filters.
- Q9. Can LT1013IN8 be used as a comparator, and what are the considerations?
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- A9. LT1013IN8 can be used as a precision comparator, particularly in single-supply systems, producing TTL-compatible outputs under appropriate supply conditions. The datasheet provides rise and fall response times for small overdrives (10 mV, 5 mV, 2 mV). When using LT1013IN8 as a comparator, designers should consider its normal op amp response characteristics, including propagation delays and lack of internal hysteresis, and add external hysteresis if needed for noise immunity.
- Q10. How does LT1013IN8 compare to older devices like LM158 or MC1458?
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- A10. LT1013IN8 is specifically described as an upgrade to dual op amps such as MC1458/MC1558, LM158, and OP‑221 in the standard 8‑pin configuration. It offers lower offset voltage, lower drift, higher open‑loop gain, and improved single‑supply behavior, including ground-including common-mode range and robust output sinking at low voltages. It also addresses phase reversal issues present in some earlier single-supply designs.
- Q11. What are typical application areas where LT1013IN8 is used?
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- A11. Typical applications include battery-powered precision instrumentation, strain gauge signal conditioners, thermocouple amplifiers, instrumentation amplifiers, 4 mA to 20 mA current loop transmitters, active filters, multiple gain stages, liquid flowmeters using thermistor networks, RTD signal conditioners, methane detectors, low dropout regulators, voltage-controlled current sources, temperature-compensated oscillators, and step-up switching regulator control circuits.
- Q12. Which temperature ranges are available for LT1013-family devices like LT1013IN8?
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- A12. LT1013AM and LT1013M devices operate from −55 °C to 125 °C. LT1013I operates from −40 °C to 85 °C. LT1013AC, LT1013C, and LT1013D operate from 0 °C to 70 °C. LT1013IN8, as an N8 PDIP variant, is available in grades that correspond to these temperature ranges, allowing selection according to ambient and system requirements.
- Q13. What packaging is available for LT1013, and what does LT1013IN8 specifically use?
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- A13. The LT1013 family is offered in multiple packages, including 8‑lead TO‑5 metal can (H), 8‑lead CERDIP (J8), 8‑lead PDIP (N8), and 8‑lead small-outline (S8), among others. LT1013IN8 is the 8‑lead PDIP (N8) version. Package drawings define mechanical dimensions and pin‑1 indicators but do not change electrical performance.
- Q14. Does the LT1013IN8 output tolerate short circuits, and for how long?
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- A14. The absolute maximum ratings specify that the output short‑circuit duration is “indefinite,” meaning the device can withstand continuous output shorting within the constraints of its thermal environment and junction temperature limit. Nevertheless, in practical designs, continuous short circuits should be avoided to reduce thermal stress on the package.
- Q15. Is the LT1013IN8 pinout identical to all standard 8‑pin dual op amp pinouts?
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- A15. No. The datasheet explicitly notes that the LT1013 pin configuration differs from the standard 8‑pin dual-in-line configuration. While LT1013IN8 is designed as a pin-compatible upgrade for several common dual op amps, designers must confirm the pin mapping in the specific datasheet drawing to ensure correct connections for non-inverting inputs, inverting inputs, outputs, and supply pins.
- Q16. What design techniques are shown in the datasheet for maximizing LT1013IN8 accuracy?
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- A16. The datasheet includes examples such as a triple op amp instrumentation amplifier with bias current cancellation, detailed RTD linearization circuits with specific resistor ratios and trim sequences, and low‑noise RMS-to-DC converter configurations. These examples demonstrate how to use LT1013IN8’s high gain, low offset, and low bias current to construct precision amplifiers, current sources, and measurement chains, often with trimming steps to fine-tune zero, gain, and linearity.
- Q17. Are there any parameters that are guaranteed by design but not 100% tested for LT1013IN8?
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- A17. Yes. The notes indicate that some parameters are guaranteed by design and characterization but not 100% tested on every unit. Typical values are defined as the 60% yield of parameter distributions of individual amplifiers; for instance, out of 100 LT1013 devices, approximately 120 op amps (two per device) are expected to perform better than the indicated typical specification. Designers should rely on guaranteed limits for worst-case design and use typical values for performance estimation.
