LM431BCZX Replacement: TL431IZ-AP, TL431BCLPRAG

Original Part

LM431BCZX

onsemi

Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±1% 100 mA TO-92-3

Alternative Part

TL431IZ-AP

STMicroelectronics

Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±2.21% 100 mA TO-92-3

TL431BCLPRAG

onsemi

Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±0.4% 100 mA TO-92-3

1. TL431IZ-AP Substitution Conclusion The TL431IZ-AP is functionally compatible with the original LM431BCZX in terms of core features (adjustable shunt reference, voltage and current ranges) and package, and can serve as a functional substitute. The key difference lies in its initial accuracy (±2.21%), which is significantly lower than the original part’s ±1%, and its temperature coefficient (Temp Coef) typical value is not provided. If substituted directly, the reference voltage output of the circuit may exhibit greater initial error, and its voltage drift behavior over temperature remains undefined. This may fail to meet the original design requirements for voltage accuracy and temperature stability, especially in precision measurement or wide-temperature-range applications, where the risk is relatively high.

2. TL431BCLPRAG Substitution Conclusion The TL431BCLPRAG is an ideal direct replacement for the LM431BCZX and represents an upgrade in core performance. Both parts are identical in electrical parameters and package, but the TL431BCLPRAG offers a much better initial accuracy (±0.4%) compared to the original part’s ±1%. After substitution, the reference voltage accuracy and consistency of the circuit system will be significantly improved, while temperature stability (50ppm/°C) remains unchanged. This ensures reliable operation under all original design conditions and may even enhance the performance metrics of the end product, making it a reliable and superior alternative.

Analysis ID: BDF8-CE53000

Based on part parameters and for reference only. Not to be used for procurement or production.