Original Part
Alternative Part
Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±0.5% 100 mA TO-92-3
1. LM431BCZXA Substitution Conclusion
The LM431BCZXA can serve as a direct replacement for the TL431ILPRPG, with its key improvement being an increase in accuracy from ±2.2% to ±1%. Other core parameters—such as the output voltage range of 2.495V–36V, output current of 100mA, temperature coefficient of 50ppm/°C, cathode current of 1mA, and TO-92-3 package—remain identical to the original device. The higher accuracy provides a more stable reference voltage in voltage reference or feedback circuits, contributing to improved overall system performance. As both devices are from onsemi, pin compatibility and process characteristics are highly consistent, allowing substitution without adjustment to the external circuitry.
2. TL431BQLPME3 Substitution Conclusion
Substituting the TL431BQLPME3 for the TL431ILPRPG requires careful evaluation. Its primary advantage is a significantly improved accuracy of ±0.5%. However, there are two key differences: first, the cathode current is reduced to 700µA (compared to 1mA in the original part), which may affect bias circuit design or stability under low-current operation; second, the temperature coefficient parameter is not explicitly specified, so actual performance should be verified if the application is sensitive to temperature drift. Although the package and voltage range are the same, the change in cathode current necessitates recalculating the current-limiting resistor to ensure proper operation during a direct replacement. It is recommended for use in applications with extremely high accuracy requirements where the current conditions are permissible.
Analysis ID: 6957-1BD4000
Based on part parameters and for reference only. Not to be used for procurement or production.
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