ERJ-UP8F3602V

FAQFrequently Asked Questions

• What are the key design considerations when selecting the ERJ-UP8F3602V for high-temperature automotive applications? The ERJ-UP8F3602V is rated for continuous operation from -55°C to 155°C, making it suitable for under-hood and engine compartment environments. However, the 0.667W power rating and ±100ppm/°C temperature coefficient mean that resistor values will drift measurably in thermal cycling scenarios. When designing bias networks or precision signal conditioning circuits, account for resistance shift at temperature extremes—particularly in sensor interfaces where a 36 kOhm pull-up or load resistor experiences both ambient heating and self-heating from bias current. Derating to 50-60% of rated power in continuous operation reduces thermal drift and extends service life in vibration-prone automotive settings.
• Can the ERJ-UP8F3602V replace legacy automotive resistors with lower AEC-Q200: qualification in retrofit or design-in scenarios? The ERJ-UP8F3602V carries full AEC-Q200: qualification, confirming it meets automotive stress and reliability screening. When migrating from non-qualified or lower-grade thick-film resistors to the ERJ-UP8F3602V, the chief trade-off is cost; qualification adds procurement overhead but eliminates field failure risk in safety-critical or high-reliability vehicle modules. The anti-sulfur coating provides additional robustness in corrosive environments—relevant for modules exposed to salt spray or industrial cleaning solvents. For drop-in replacement, verify the original part's footprint; the 1206 (3.20mm × 1.60mm) is standard, but legacy designs occasionally used non-standard geometries.
• What voltage and current limitations should guide circuit design when using the ERJ-UP8F3602V in signal-conditioning or analog front-end networks? The ERJ-UP8F3602V has a maximum working voltage of 200V (typical for thick-film chip resistors in this package), though automotive analog circuits rarely approach this limit. For 36 kOhm networks, the practical constraint is current: at 0.667W maximum dissipation, the absolute maximum DC current is approximately 4.3mA (P=I²R). In sensor pull-up circuits, 3–5V bias rails with 36 kOhm loads draw 83–139µA—well within safe margins and producing minimal self-heating. When the ERJ-UP8F3602V is used in series with high-impedance inputs (ADC or op-amp), ensure circuit impedance doesn't approach the resistor's value, as that degrades signal conditioning and introduces thermal noise on the order of 150–200nV/√Hz.
• How does the anti-sulfur coating of the ERJ-UP8F3602V affect long-term reliability in industrial or corrosive-atmosphere storage and field conditions? The anti-sulfur feature of the ERJ-UP8F3602V addresses environmental degradation from hydrogen sulfide, sulfur dioxide, and other sulfur compounds common in petrochemical plants, coastal regions, and industrial facilities. Without anti-sulfur treatment, thick-film resistor paste can corrode under these gases, causing intermittent contact and resistance drift. The ERJ-UP8F3602V's coating extends survival time in 85°C/85% RH salt-fog conditions and maintains tolerance stability over 10+ years in harsh outdoor or chemical-exposure scenarios. For storage, maintain MSL 1 (unlimited moisture sensitivity) conditions—the ERJ-UP8F3602V tolerates warehouse environments without baking, simplifying supply chain handling.
• What are the tolerance and stability trade-offs when choosing the ERJ-UP8F3602V over precision thin-film resistors for analog measurement or calibration circuits? The ERJ-UP8F3602V offers ±1% initial tolerance and ±100ppm/°C drift, compared to thin-film resistors at ±0.1% and ±25ppm/°C. In temperature-compensated analog front-ends, the ERJ-UP8F3602V introduces approximately 0.36% resistance shift across the full -55°C to 155°C range; thin-film resistors shift only 0.09%. For ratiometric measurement circuits—such as transimpedance amplifier feedback networks or precision dividers—the ERJ-UP8F3602V is adequate if both resistors track together; mismatched thermal coefficients between the ERJ-UP8F3602V and a reference element can introduce 0.2–0.3% measurement error at temperature extremes. In DC bias or non-critical analog paths, the ERJ-UP8F3602V cost advantage and automotive qualification outweigh precision limitations.
• How should the ERJ-UP8F3602V be thermal-managed in high-current or continuous power dissipation scenarios? The 0.667W rating assumes free-air convection on standard FR-4 PCB copper. In confined spaces or multi-layer boards with high-copper density, thermal resistance rises, reducing effective power dissipation capability of the ERJ-UP8F3602V. Hand calculations suggest PCB thermal resistance of 200–250°C/W for a single 1206 resistor on an internal layer; dissipating the full 0.667W would raise junction temperature by 133–167°C above ambient. In automotive modules with potted or conformal-coated assemblies, actual dissipation capacity may drop to 0.4–0.5W. To maintain margin, design circuits so the ERJ-UP8F3602V carries no more than 0.3–0.4W continuously; higher currents require parallel resistance networks or migration to larger packages (like 2010 or 2512).
• What are the insertion loss or signal attenuation characteristics when the ERJ-UP8F3602V is used in RF or high-speed digital filtering applications? The ERJ-UP8F3602V is a thick-film resistor optimized for DC and low-frequency analog circuits; it is not recommended for RF or high-speed switching above 1 MHz without verification. Parasitic inductance (typical 0.1–0.3nH for 1206 thick-film) and capacitance introduce impedance deviation at frequencies above a few hundred kilohertz. For signal filtering, the ERJ-UP8F3602V works in RC or LC networks at audio and low-speed data rates (< 100 kHz); above that, measure or simulate insertion loss in actual PCB layout. In high-speed digital reset or pull-up circuits (logic levels, I2C, CAN), the ERJ-UP8F3602V is acceptable because transition speeds are relatively slow and parasitics contribute minimally to timing error.
• Can the ERJ-UP8F3602V be safely used in DC-DC converter feedback networks, and what stability or regulation impacts should be anticipated? The ERJ-UP8F3602V is commonly applied in DC-DC converter feedback dividers to set output voltage. At 36 kOhm, it suits converters with output impedances in the megaohm range (typical for optocoupler feedback circuits). Temperature drift of ±100ppm/°C means a 5V output may drift ±5mV across full temperature range due to the ERJ-UP8F3602V alone; this is acceptable for most industrial converters (±5% tolerance typical). In precision DC-DC designs requiring <1% output stability, pair the ERJ-UP8F3602V with a thermistor or temperature-compensated reference IC. Noise performance: thick-film resistors exhibit Johnson noise of approximately 150nV/√Hz at 36 kOhm; this is negligible in feedback networks but may matter if the ERJ-UP8F3602V is part of an analog signal path after the converter output.
• What soldering and rework considerations apply to the ERJ-UP8F3602V in high-reliability or aerospace-qualified assembly processes? The ERJ-UP8F3602V is rated MSL 1 (unlimited moisture absorption), so standard reflow soldering (peak temp 260°C, 10–30 seconds) poses no reliability risk. However, repeated rework cycles (reheating to reflow temperature 3+ times) can degrade thick-film paste adhesion and increase resistance drift or intermittent opens. For high-reliability applications, minimize rework; if the ERJ-UP8F3602V must be replaced, consider hand-soldering with controlled heating and flux cleanup to reduce thermal shock. The 0.028" maximum seated height is compatible with standard pick-and-place equipment and solder-paste stencil design; no special handling is required compared to standard 1206 components.
• How does the ERJ-UP8F3602V compare to Vishay CRCW1206 or Yageo RC1206 resistors in terms of automotive qualification, cost, and long-term availability? The ERJ-UP8F3602V carries Panasonic's AEC-Q200: qualification; Vishay CRCW1206 and Yageo RC1206 series offer equivalent or better qualification depending on variant selection. All three are 1206 thick-film parts with ±1% tolerance available at 36 kOhm. Cost differences are typically 2–5% across volume production, with Panasonic and Vishay commanding slight premiums due to established automotive supply chains. Key differentiators: ERJ-UP8F3602V includes anti-sulfur coating (advantage in corrosive environments), CRCW1206 offers tighter temperature coefficients (±50ppm/°C) at higher cost, and RC1206 provides lower-cost sourcing in emerging markets. For design-in, verify long-term availability through your distributor; automotive part lifecycles span 10+ years, and Panasonic ERJ-UP8 series shows stable allocation across major suppliers.
• What precautions should be taken when using the ERJ-UP8F3602V in circuits subject to electrostatic discharge (ESD) or transient overvoltage events? The ERJ-UP8F3602V, as a passive thick-film resistor, has no inherent ESD sensitivity; however, it can fail if subjected to sustained overvoltage above its 200V rating or transient pulses exceeding peak current limits. In automotive circuits with inductive kickback (solenoid drivers, motor control), place a TVS diode or varistor in parallel with circuits containing the ERJ-UP8F3602V to clamp transients below the resistor's breaking voltage. Self-heating during surge events can cause open circuits if the resistor is pushed beyond 0.667W for extended periods (>100ms). For ESD-sensitive downstream circuits (analog sensors, ADC inputs), the ERJ-UP8F3602V provides mild ESD protection as a series resistor but should be combined with dedicated ESD suppressors for sensitive interfaces.
• How should the ERJ-UP8F3602V be specified or validated in design documentation and test plans to ensure compliance with automotive reliability standards? Include the full part number ERJ-UP8F3602V in the Bill of Materials with AEC-Q200: qualification noted; cross-reference Panasonic's datasheet revision to confirm thermal coefficient, anti-sulfur feature, and MSL rating. In test plans, verify resistor tolerance at room temperature (20–25°C) using precision multimeter (±0.5% accuracy), then validate thermal drift by measuring resistance at -40°C and 125°C in a temperature chamber; confirm drift stays within ±1% bounds. Soldering validation should include thermal cycling (-40°C to 125°C, 15+ cycles) with periodic resistance checks to detect mechanical or adhesion failures. For high-reliability programs (automotive safety-critical modules), request lot traceability and failure analysis data from your distributor to confirm no process anomalies in the manufacturing batch.