Alternative Part
1. TL431BVLPRAG Substitution Conclusion
The TL431BVLPRAG is a fully viable substitute for the original LM431BIZX, as it closely matches the core electrical parameters: output voltage range (2.495V to 36V), output current (100mA), and temperature coefficient (50ppm/°C typical). Both devices use a TO-92-3 variant package and are pin-compatible. The primary difference is the tighter tolerance of the TL431BVLPRAG (±0.4%), compared to ±1% for the original part, providing a more stable reference voltage in voltage reference applications without requiring circuit modifications. Overall, the TL431BVLPRAG performs equivalently or better and can be used as a direct replacement.
2. TL431ACLPRE3 Substitution Conclusion
The TL431ACLPRE3 is a functionally feasible substitute for the original LM431BIZX in terms of package and basic performance, sharing the same output voltage range, output current, and tolerance (±1%). Both are offered in a TO-92-3 package and are pin-compatible. Key differences include a lower cathode current of 600 µA for the TL431ACLPRE3 versus 1 mA for the original. This may improve power efficiency in low-current applications, but if the original circuit relies on the 1 mA cathode current operating point, it could lead to reference voltage drift or stability issues. Additionally, the temperature coefficient is unspecified for the TL431ACLPRE3, whereas the original specifies 50ppm/°C typical. This may introduce additional performance uncertainty over wide temperature ranges. Substitution should be evaluated based on the circuit’s sensitivity to cathode current and temperature stability, with bias resistor adjustments made if necessary.
Analysis ID: 490D-A37D000
Based on part parameters and for reference only. Not to be used for procurement or production.
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