LM431BCZXA Replacement: TL431AILPG, KA431LZTA

Original Part

LM431BCZXA

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

Alternative Part

TL431AILPG

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Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±1% 100 mA TO-92 (TO-226)

KA431LZTA

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Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±0.5% 100 mA TO-92-3

1. TL431AILPG Substitution Conclusion The TL431AILPG can directly replace the original LM431BCZXA, as their key electrical parameters are identical: both are adjustable shunt voltage references with an output voltage range of 2.495V to 36V, an output current of 100mA, a temperature coefficient of 50ppm/°C, and a cathode operating current of 1mA. The primary difference lies only in the package description—the TL431AILPG uses a TO-92-3 long-body package, whereas the original part is in a TO-226AA molded-lead package. While there may be slight variations in mechanical dimensions, the pinout and functionality are fully compatible, ensuring no impact on electrical performance. This allows for a drop-in replacement in most circuit layouts.

2. KA431LZTA Substitution Conclusion The KA431LZTA is a suitable replacement for the original LM431BCZXA and offers improved performance. Core parameters—output voltage range, output current, temperature coefficient, and cathode current—are exactly the same. However, the KA431LZTA provides an initial accuracy of ±0.5%, which is superior to the original part’s ±1% tolerance. In applications requiring higher reference voltage precision, the KA431LZTA can deliver a more stable voltage reference. It remains fully compatible with the original circuit design and package (also TO-226AA molded-lead), ensuring no degradation in system performance and potentially enhancing overall accuracy.

Analysis ID: 9C7B-04A4000

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