Product Overview of the 2SD1407A-Y(F) NPN Power Transistor
The 2SD1407A-Y(F) is a silicon NPN triple-diffused bipolar junction transistor designed by Toshiba Semiconductor and Storage. It is intended for power amplifier applications, particularly in industrial environments, and is supplied in a through-hole TO-220NIS package.
The 2SD1407A-Y(F) is specified as a 100 V, 5 A device with a power dissipation capability of 30 W and a typical transition frequency of 12 MHz. These parameters position the 2SD1407A-Y(F) as a general-purpose power transistor suitable for roles such as output stages in power amplifiers, power control blocks, and industrial drive circuitry where moderate to high voltage and current handling are required.
A key feature of the 2SD1407A-Y(F) is its relatively low collector–emitter saturation voltage, which supports efficient operation when used as a switch or in the output stage of a power amplifier. The device is also designed as the NPN complement to the PNP transistor 2SB1016A, enabling straightforward implementation of push-pull amplifier and complementary output stages.
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Key Performance Characteristics of the 2SD1407A-Y(F) in Power Amplifier Applications
The 2SD1407A-Y(F) is specified for power amplifier and industrial applications and combines several characteristics that make it suitable for such roles:
• High breakdown voltage (VCEO = 100 V):
The collector–emitter breakdown voltage rating of 100 V (with base open) allows the 2SD1407A-Y(F) to be used in circuits where the collector may experience relatively high supply voltages or transient overvoltages. In power amplifier designs, this enables use with higher supply rails while maintaining a margin between operating voltage and breakdown.
Example: In an industrial amplifier powered from a 60–70 V DC rail, the 2SD1407A-Y(F) can provide amplifier headroom and tolerate occasional spikes that remain below the 100 V VCEO rating when combined with appropriate snubber and protection circuitry.
• Low collector saturation voltage (VCE(sat) = 2.0 V max):
The datasheet specifies a maximum collector–emitter saturation voltage of 2.0 V under test conditions defined by Toshiba. A low saturation voltage reduces conduction losses when the transistor is driven fully on. For switching operation and for heavily driven output stages in class B or AB power amplifiers, the lower VCE(sat) of the 2SD1407A-Y(F) helps reduce power dissipation and improves overall efficiency.
Example: In a load-switching application where the 2SD1407A-Y(F) drives a 5 A load, a lower VCE(sat) directly translates into fewer watts lost as heat. At 2.0 V and 5 A, the device would dissipate up to 10 W in saturation; any reduction from this maximum in real operation improves thermal margins.
• Transition frequency (fT ≈ 12 MHz):
The 2SD1407A-Y(F) has a typical transition frequency of 12 MHz. This parameter reflects the frequency at which the current gain falls to unity. For power amplifier applications, fT provides an indication of how well the transistor can handle higher-frequency signals and how stable it can be in amplifier and switching circuits if compensation and layout are properly managed.
In practical terms, an fT of 12 MHz enables the 2SD1407A-Y(F) to operate effectively in audio-band power amplifiers and many low- to mid-frequency industrial control circuits, while still providing sufficient gain at the frequencies of interest.
• Power dissipation capability (30 W):
The 2SD1407A-Y(F) is rated for a power dissipation of 30 W (under specified thermal conditions). In conjunction with its TO-220NIS package, this rating allows the device to handle substantial current and voltage combinations when mounted with appropriate heat sinking and thermal management.
Example: In an industrial motor control circuit where the transistor operates as part of a linear regulator or as a switching element with non-zero duty cycle, designers can allocate a thermal budget for the 2SD1407A-Y(F) based on the 30 W rating and design the heatsink and airflow accordingly.
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Absolute Maximum Ratings and Reliability Considerations for the 2SD1407A-Y(F)
The absolute maximum ratings of the 2SD1407A-Y(F) define the limits within which the transistor can be used without risking immediate damage. These ratings are specified at an ambient temperature of Ta = 25°C. While the full numeric table is not reproduced in the provided text, the documentation clearly indicates that:
• The 2SD1407A-Y(F) is rated for operation up to 100 V between collector and emitter (VCEO).
• The maximum collector current is 5 A.
• The power dissipation is 30 W.
The datasheet also includes an explicit caution about continuous operation under heavy loads—specifically high temperature, current, and voltage, and large temperature variations. Even if the operating conditions remain within the stated absolute maximum ratings, such stress can significantly reduce the long-term reliability of the 2SD1407A-Y(F).
To manage this, the documentation recommends that designs using the 2SD1407A-Y(F) follow guidance from the Toshiba Semiconductor Reliability Handbook, including:
• Handling precautions
• Derating concepts and methods
• Use of individual reliability data such as reliability test reports and estimated failure rates
In practice, this means that for the 2SD1407A-Y(F), engineers should:
• Derate voltage, current, and power dissipation from their maximums based on expected ambient temperature ranges and internal heating.
• Avoid operating the 2SD1407A-Y(F) continuously at or near its 30 W dissipation limit without careful thermal design.
• Consider transient conditions such as inrush currents, short-duration overloads, or repeated start/stop cycles that can cumulatively affect reliability.
By applying derating, a designer might, for example, limit the continuous power dissipation of the 2SD1407A-Y(F) to substantially below 30 W in a high-ambient-temperature industrial enclosure, while still leveraging the higher rating as a margin for transient events.
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Electrical Characteristics and Gain Classification of the 2SD1407A-Y(F)
At Ta = 25°C, the 2SD1407A-Y(F) is characterized by a set of electrical parameters that define its behavior in typical operation. While the full numerical table is not included in the text, one key parameter explicitly documented is the DC current gain (hFE) classification.
The 2SD1407A-Y(F) uses a classification scheme based on measured hFE under defined test conditions:
• hFE(1) classification:
– R: 40 to 80
– O: 70 to 140
– Y: 120 to 240
The specific variant highlighted in the documentation is the 2SD1407A-Y(F), where the suffix “Y” indicates the gain class with hFE between 120 and 240. This classification gives a range for the DC current gain in the device’s specified operating region.
Implications of the 2SD1407A-Y(F) “Y” gain class include:
• Higher current gain in the operating region compared to “R” or “O” class devices.
• Reduced base drive requirements for a given collector current in many amplifier and switching configurations.
Example: If a design requires a collector current of 3 A and the 2SD1407A-Y(F) is used with an assumed hFE of 120 (lower end of the “Y” range under the relevant test conditions), the base current requirement would be approximately 25 mA in that operating region. Designing for the lower bound of the “Y” range provides margin to account for temperature and device-to-device variation.
Engineers using the 2SD1407A-Y(F) should refer to the full Toshiba datasheet for detailed electrical characteristics such as:
• Collector–base breakdown voltage
• Collector–emitter saturation voltage versus current
• Base–emitter voltage
• Output characteristics over current and voltage
• Gain versus collector current and temperature
These parameters, combined with the hFE classification, allow accurate prediction of behavior when the 2SD1407A-Y(F) is included in amplifier stages, switching blocks, or linear regulators.
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Package, Mounting, and Mechanical Details of the 2SD1407A-Y(F) TO-220NIS
The 2SD1407A-Y(F) is provided in a TO-220NIS through-hole package. This package type is widely used for discrete power transistors and provides a good balance between:
• Power dissipation capability
• Mechanical robustness
• Ease of mounting to heatsinks and PCBs
Key mechanical attributes of the 2SD1407A-Y(F) include:
• Package: TO-220NIS (through-hole)
• Typical weight: 1.7 g
The documentation includes dimensional drawings in millimeters, which define the lead spacing, body width, height, and mounting hole position. These dimensions are used to design the PCB footprint and mechanical assembly, including:
• Correct hole spacing and pad sizes for the three leads.
• Proper alignment of the mounting tab with heatsinks or chassis.
• Sufficient clearance to neighboring components for thermal and electrical isolation.
Example: In an industrial power module, the 2SD1407A-Y(F) might be arranged along the edge of a PCB with multiple TO-220NIS devices mounted to a shared heatsink. Designers use the dimensional data and 1.7 g typical weight to verify mechanical stability and to select appropriate mounting hardware and thermal interface materials.
The TO-220NIS configuration also facilitates through-hole soldering and rework. When using the 2SD1407A-Y(F) in such assemblies, careful consideration of solder joint quality and mechanical stress on leads (due to heatsink mounting) helps maintain long-term reliability.
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Complementary Pairing of the 2SD1407A-Y(F) with the 2SB1016A
The 2SD1407A-Y(F) is explicitly described as complementary to the 2SB1016A, which is a PNP transistor of matching characteristics. This complementary relationship is beneficial in designs where both NPN and PNP devices are required, such as:
• Push-pull power amplifier stages
• H-bridge drivers
• Symmetrical power control circuits
Using the 2SD1407A-Y(F) as the NPN device and the 2SB1016A as the PNP counterpart allows:
• Similar voltage and current capability on the positive and negative sides of the circuit.
• More symmetrical performance, including similar gain and saturation characteristics, leading to reduced distortion in amplifier applications.
Example: In an audio power amplifier output stage, pairing the 2SD1407A-Y(F) with the 2SB1016A creates a complementary emitter follower configuration. The complementary nature simplifies biasing and helps achieve balanced waveform handling on both the positive and negative half-cycles of the output signal.
The pairing of the 2SD1407A-Y(F) with the 2SB1016A also simplifies device selection and procurement, as both devices can be selected to meet consistent rating and performance requirements across the design.
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Regulatory, Environmental, and Usage Restrictions for the 2SD1407A-Y(F)
The documentation for the 2SD1407A-Y(F) includes detailed notes on product use, reliability, and regulatory considerations from Toshiba Semiconductor and Storage.
General usage scope of the 2SD1407A-Y(F):
The 2SD1407A-Y(F) is intended for use in:
• General electronics applications, such as:
– Computers
– Personal equipment
– Office equipment
– Measuring equipment
– Industrial robots
– Home electronic appliances
• Specific applications expressly stated in Toshiba documentation.
Unintended uses for the 2SD1407A-Y(F):
The product is not intended or warranted for use in equipment or systems requiring extraordinarily high reliability where failure could cause loss of life, bodily injury, serious property damage, or serious public impact. Examples given include (but are not limited to):
• Equipment used in nuclear facilities
• Aerospace equipment
• Medical equipment
• Equipment used for automobiles, trains, ships, and other transportation
• Traffic signaling equipment
• Equipment used to control combustion or explosions
• Safety devices, elevators, and escalators
• Devices related to electric power infrastructure
• Equipment used in finance-related fields
The documentation advises against using the 2SD1407A-Y(F) in such “Unintended Use” fields unless specifically permitted by Toshiba.
Reliability and design responsibility:
Toshiba emphasizes that the 2SD1407A-Y(F), like any semiconductor product, can malfunction or fail. Therefore:
• Designers are responsible for compliance with safety standards.
• Adequate safeguards should be implemented to minimize risk (for example, redundant circuits, protection devices, and fault detection).
• Users must consult the latest versions of all relevant Toshiba documentation, including the Toshiba Semiconductor Reliability Handbook, application notes, and data sheets, before designing the 2SD1407A-Y(F) into a system.
Environmental and RoHS considerations for the 2SD1407A-Y(F):
The documentation references markings such as “[G]/RoHS COMPATIBLE” or “[G]/RoHS [Pb]” and states that for details regarding environmental aspects, including RoHS compatibility, users should contact a Toshiba sales representative. The RoHS reference is specifically linked to the EU Directive 2002/95/EC, which restricts the use of certain hazardous substances in electrical and electronic equipment.
From an application viewpoint, when using the 2SD1407A-Y(F):
• Designers should ensure compliance with applicable environmental regulations, including RoHS-related directives.
• It is recommended to confirm the specific RoHS status of the 2SD1407A-Y(F) batch being used, as indicated by device labeling and Toshiba’s latest guidance.
Export control and military usage:
The 2SD1407A-Y(F) and related software or technology may be subject to export control regulations, such as:
• Japanese Foreign Exchange and Foreign Trade Law
• U.S. Export Administration Regulations
The documentation states that the 2SD1407A-Y(F) and associated technology must not be used for military purposes, including the design, development, use, stockpiling, or manufacture of nuclear, chemical, or biological weapons, or missile technology products. Export and re-export are prohibited except in compliance with all applicable laws and regulations.
Intellectual property and documentation use:
The documentation also notes:
• No license to any intellectual property rights is granted by the datasheet.
• Reproduction of the document is restricted.
• Toshiba assumes no liability for infringements resulting from product use.
These notices frame how the 2SD1407A-Y(F) information should be used in design, documentation, and product integration.
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Conclusion on Applying the 2SD1407A-Y(F) in Industrial Designs
The 2SD1407A-Y(F) from Toshiba Semiconductor and Storage is a silicon NPN triple-diffused power transistor tailored for power amplifier and industrial applications. Its combination of 100 V collector–emitter breakdown voltage, 5 A collector current, 30 W power dissipation, and 12 MHz transition frequency gives it a versatile performance profile.
The 2SD1407A-Y(F) offers a low collector–emitter saturation voltage and a high-gain Y classification (hFE = 120 to 240 under specified conditions), which supports efficient operation and reduced base drive requirements. The TO-220NIS through-hole package and 1.7 g typical weight allow reliable mechanical mounting and effective heat management, particularly in conjunction with heatsinks in power modules and industrial equipment.
Complementarity with the 2SB1016A simplifies the design of NPN/PNP pairs in push-pull and symmetric output stages. At the same time, the comprehensive usage guidelines, reliability considerations, and regulatory constraints provided by Toshiba frame how the 2SD1407A-Y(F) should be selected and integrated into systems.
By combining appropriate derating, thermal design, circuit protection, and regulatory compliance, the 2SD1407A-Y(F) can be deployed effectively in a wide range of general and industrial power amplifier roles while aligning with Toshiba’s stated application scope and reliability expectations.
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Frequently Asked Questions (FAQ) about the 2SD1407A-Y(F)
- Q1. What are the main application areas of the 2SD1407A-Y(F)?
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- A1. The 2SD1407A-Y(F) is designed for power amplifier applications and industrial applications. Typical areas include general electronics such as computers, personal and office equipment, measuring equipment, industrial robots, and home electronics appliances. It can be used in output stages of power amplifiers, power control circuits, and similar industrial drive functions, provided that operating conditions and reliability requirements align with Toshiba’s usage guidelines.
- Q2. What are the key electrical ratings of the 2SD1407A-Y(F)?
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- A2. The 2SD1407A-Y(F) has a collector–emitter breakdown voltage VCEO of 100 V, a maximum collector current of 5 A, and a power dissipation capability of 30 W. It also has a typical transition frequency of 12 MHz and a maximum collector saturation voltage VCE(sat) of 2.0 V under specified test conditions. These ratings define its capability in handling voltage, current, and power in amplifier and switching roles.
- Q3. What does the “Y(F)” in 2SD1407A-Y(F) signify?
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- A3. The “Y” in 2SD1407A-Y(F) refers to the hFE (DC current gain) classification of the device. According to the classification: R = 40–80, O = 70–140, and Y = 120–240. The 2SD1407A-Y(F) therefore belongs to the high-gain range of 120 to 240 under the specified test conditions (hFE(1)). The additional “(F)” typically indicates a specific packaging, finish, or variant definition used by Toshiba; details are given in the full Toshiba datasheet.
- Q4. How does the gain classification of the 2SD1407A-Y(F) affect circuit design?
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- A4. The Y-class gain (hFE = 120–240) of the 2SD1407A-Y(F) reduces the base current needed to achieve a given collector current within the defined operating region. In amplifiers, this allows higher effective gain stages or smaller drive currents from preceding stages. In switching circuits, it simplifies base drive design, although designers should still allow for worst-case conditions by assuming the lower bound of the hFE range when calculating base resistor values and drive currents.
- Q5. What is the significance of the low VCE(sat) of the 2SD1407A-Y(F)?
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- A5. The 2SD1407A-Y(F) specifies a maximum collector saturation voltage VCE(sat) of 2.0 V. A low VCE(sat) means that when the transistor is fully turned on in saturation, the voltage drop between collector and emitter is reduced. This lowers conduction losses and decreases heat generation in high-current operation. In power amplifiers and switching applications, this contributes to higher efficiency and reduced thermal stress when the transistor is driven into saturation or operated close to it.
- Q6. What package is used for the 2SD1407A-Y(F), and what are its mechanical characteristics?
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- A6. The 2SD1407A-Y(F) uses the TO-220NIS through-hole package. It has a typical weight of 1.7 g and the mechanical dimensions are specified in millimeters in the Toshiba documentation. The TO-220NIS package supports mounting to heatsinks and printed circuit boards, providing a path for efficient heat dissipation and mechanical stability. Designers should use the provided dimensional drawings to create PCB footprints and mechanical mounting structures that match the 2SD1407A-Y(F).
- Q7. Is the 2SD1407A-Y(F) suitable for use in automotive, medical, or aerospace systems?
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- A7. The documentation states that the 2SD1407A-Y(F) is not intended or warranted for use in equipment or systems requiring extraordinarily high levels of quality or reliability, where failure could cause loss of life, bodily injury, serious property damage, or serious public impact. Examples include medical equipment, aerospace systems, automotive/train/ship equipment, traffic signaling equipment, combustion control, safety devices, and power infrastructure-related devices. Use in these fields is not recommended unless specifically permitted by Toshiba.
- Q8. How should reliability be managed when using the 2SD1407A-Y(F) in high-stress conditions?
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- A8. Toshiba notes that continuous operation under heavy loads (high temperature, current, voltage, or significant temperature variations) may significantly reduce reliability, even within absolute maximum ratings. For the 2SD1407A-Y(F), designers should apply derating techniques for voltage, current, and power dissipation, ensuring that normal operation stays below the absolute maximum values. The Toshiba Semiconductor Reliability Handbook provides guidance on handling precautions, derating methods, and interpretation of reliability test data and failure rates, all of which should be used when designing with the 2SD1407A-Y(F).
- Q9. How does the 2SD1407A-Y(F) pair with the 2SB1016A in practical circuits?
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- A9. The 2SD1407A-Y(F) is complementary to the PNP transistor 2SB1016A. In practical circuits, they can be used together in push-pull or complementary emitter follower configurations, such as in audio power amplifier output stages or bidirectional industrial drivers. The complementary relationship enables similar voltage and current capabilities for positive and negative swings, facilitating symmetrical output performance and reducing circuit complexity when implementing full-bridge or complementary amplifier structures.
- Q10. What environmental and RoHS considerations apply to the 2SD1407A-Y(F)?
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- A10. The documentation references RoHS-related markings such as “[G]/RoHS COMPATIBLE” or “[G]/RoHS [Pb]” and states that product environmental details, including RoHS compatibility, should be confirmed with Toshiba. The RoHS directive mentioned is EU Directive 2002/95/EC, which restricts certain hazardous substances in electrical and electronic equipment. When using the 2SD1407A-Y(F), designers should ensure compliance with applicable environmental regulations and verify the device’s RoHS status through Toshiba’s latest documentation and markings.
- Q11. Are there any export control or military-use restrictions on the 2SD1407A-Y(F)?
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- A11. Yes. The 2SD1407A-Y(F) and related technology may be controlled under the Japanese Foreign Exchange and Foreign Trade Law and the U.S. Export Administration Regulations. The product and related software/technology must not be used for or incorporated into any products or systems intended for military purposes, including the design, development, use, stockpiling, or manufacture of nuclear, chemical, or biological weapons or missile technology products. Export and re-export of the 2SD1407A-Y(F) must comply with all applicable export laws and regulations.
- Q12. What precautions should be taken when using the 2SD1407A-Y(F) in circuit design?
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- A12. When designing with the 2SD1407A-Y(F), precautions include:
• Ensuring all operating voltages, currents, and power dissipation stay within derated limits derived from the absolute maximum ratings.
• Providing adequate heat sinking and thermal management consistent with the 30 W power rating and the TO-220NIS package.
• Implementing protection (such as fuses, current limiting, or transient suppression) where needed to prevent overstress.
• Consulting the latest Toshiba datasheet, application notes, and reliability handbook to validate that the 2SD1407A-Y(F) meets the intended application requirements. - Q13. Does the 2SD1407A-Y(F) carry any marking related to RoHS or production lot identification?
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- A13. The documentation notes that markings such as “[G]/RoHS COMPATIBLE” or “[G]/RoHS [Pb]” may be used and that a line under the lot number identifies product label information. These markings help identify environmental compliance and production details for the 2SD1407A-Y(F). For precise interpretation of markings and their environmental or regulatory meaning, users should refer to Toshiba’s official information and consult Toshiba representatives when necessary.
