Original Part
Alternative Part
Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±2.21% 100 mA TO-92-3
1. TL431IZ-AP Substitution Conclusion
The TL431IZ-AP can serve as a functional replacement for the original part, but key performance differences must be considered. First, its reference voltage tolerance is ±2.21%, significantly wider than the original’s ±0.4%, resulting in notably lower initial output voltage accuracy. This may preclude its use in high-precision reference applications. Second, the temperature coefficient parameter is not explicitly specified, introducing uncertainty in actual drift performance. This could pose stability risks in wide-temperature-range applications. If the circuit has relaxed requirements for voltage accuracy and temperature stability—such as in general voltage regulation or protection circuits—and the package is compatible (TO-92), substitution is acceptable.
2. LM431ACZX Substitution Conclusion
The LM431ACZX is compatible with the original part in basic parameters but exhibits two main deviations. First, its tolerance of ±2% is wider than the original’s ±0.4%, affecting initial accuracy of the output reference voltage. Second, its typical temperature coefficient of 50ppm/°C is higher than the original’s 20ppm/°C, leading to greater output voltage drift over temperature variations. This may render it unsuitable for temperature-sensitive applications, such as precision measurement or wide-temperature environments. If the application does not demand high accuracy or low temperature drift, and the package is identical, it can be considered a cost-effective alternative.
Analysis ID: 0CED-4415000
Based on part parameters and for reference only. Not to be used for procurement or production.
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