Original Part
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.4% 100 mA TO-92-3
Alternative Part
Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±2.21% 100 mA TO-92-3
1. TL431IZ-AP Substitution Conclusion
This device can serve as a replacement in many general-purpose applications, but key performance degradation must be considered. The initial accuracy of the TL431IZ-AP (±2.21%) is notably lower than that of the original part (±0.4%). Moreover, its temperature drift coefficient is unspecified, which may introduce significant error in wide-temperature-range or high-precision applications—such as precision measurement or voltage reference circuits—potentially affecting overall system accuracy. If used only in circuits insensitive to absolute accuracy, such as general switching power supply feedback or overvoltage protection, and where operating temperature variation is minimal, direct substitution is feasible. However, it is recommended to verify stability under actual operating conditions.
2. KA431AZTA Substitution Conclusion
This component can be considered as a substitute in applications with moderate accuracy requirements, but temperature effects should be evaluated. The initial accuracy of the KA431AZTA (±1%) is better than that of the TL431 but still inferior to the original part. Its temperature drift coefficient (50ppm/°C) is higher than that of the original (30ppm/°C), leading to greater output voltage variation with temperature changes. This may render it unsuitable for high/low-temperature environments or circuits demanding strict temperature stability. If the application involves limited temperature variation and allows slight voltage deviation—such as in low-cost power supplies or LED drivers—substitution is possible. Nevertheless, it is advisable to test output consistency across the full temperature range.
Analysis ID: E995-47C8000
Based on part parameters and for reference only. Not to be used for procurement or production.
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