Alternative Part
Shunt Voltage Reference IC Adjustable 2.495V 37 VV ±2.2% 100 mA TO-92-3
1. LM431ACZ/NOPB Substitution Conclusion
The LM431ACZ/NOPB can serve as a direct drop-in replacement for the original part. Both share identical core architecture, package, and key electrical specifications, such as a 100mA output current and 1mA cathode current. Minor deviations exist in the reference voltage (2.495V vs. 2.5V), maximum operating voltage (37V vs. 36V), and initial accuracy (±2.2% vs. ±2%). For the vast majority of applications, these differences are functionally negligible. The slight reference voltage offset (0.2%) can be easily compensated for or ignored via the external resistor network. The higher maximum voltage provides a slightly wider operating margin. The 0.2% reduction in initial accuracy is typically acceptable in general-purpose power supplies and error amplifier circuits. Crucially, its temperature coefficient (50ppm/°C) matches that of the original part, ensuring equivalent temperature stability performance.
2. TL431ILP Substitution Conclusion
The TL431ILP can be considered a functional substitute for general applications, but requires careful evaluation in designs with stringent temperature stability requirements. Its pinout, basic reference voltage (2.495V), accuracy (±2.2%), and current capability (100mA) are highly compatible with the original part, enabling direct functional replacement. The most critical technical difference is that its datasheet does not specify a guaranteed temperature coefficient (Tempco). The variation of its output voltage over temperature is not characterized; its performance could be better than, equal to, or significantly worse than the original part's typical 50ppm/°C. In wide-temperature-range or high-precision applications, this lack of a guaranteed parameter introduces an uncontrolled risk to system accuracy and may degrade overall performance. Therefore, it is not recommended as a substitute for the original part where a defined temperature drift specification is required.
Analysis ID: B7D8-097C000
Based on part parameters and for reference only. Not to be used for procurement or production.
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