Original Part
Alternative Part
Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±0.5% 100 mA TO-92-3
1. TL431BQLPME3 Substitution Conclusion
As a direct replacement, the TL431BQLPME3 is functionally viable but exhibits notable performance deviations. Key differences include a slightly wider reference voltage tolerance (±0.5% versus ±0.4%) and an unspecified temperature coefficient, along with a lower cathode operating current (700µA versus 1mA). In applications demanding high initial accuracy or stability across a wide temperature range, its precision and temperature drift performance may fall short of the original part. While the reduced cathode current can lower system standby power consumption, it may also affect startup behavior or dynamic response in certain designs. Verification of circuit operation at the minimum operating current is recommended.
2. TL1431CLPME3 Substitution Conclusion
The TL1431CLPME3 is a suitable direct replacement, with the primary distinction being its nominal reference voltage of 2.5V (compared to 2.495V for the original part). Although both share the same tolerance (±0.4%), this 25mV (approximately 1%) shift in nominal value will introduce a systematic offset in the set feedback or threshold voltage across all applications. If the circuit design is sensitive to absolute voltage levels—such as in precision threshold detection—the peripheral resistor network must be recalculated and adjusted. If the device is used solely for its regulation characteristics, as in switching power supply feedback loops, this minor offset is generally tolerated by the feedback control, making substitution highly feasible. Nevertheless, validation in the actual circuit is advised.
Analysis ID: F2B1-4AF2000
Based on part parameters and for reference only. Not to be used for procurement or production.
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