TL431ILPG Replacement: LM431CCZ, KA431AZBU

Original Part

TL431ILPG

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Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±2.2% 100 mA TO-92 (TO-226)

Alternative Part

LM431CCZ

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

KA431AZBU

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

1. LM431CCZ Substitution Conclusion The LM431CCZ can serve as a direct replacement for the TL431ILPG, as their key parameters—output range (2.495V–36V), 100mA output current, 50ppm/°C temperature drift, and TO-92 package—are fully compatible. Notably, the LM431CCZ offers significantly higher accuracy (±0.5%) compared to the original part (±2.2%). This improved accuracy provides a more stable voltage reference in precision-sensitive applications such as regulated power supplies and ADC reference circuits, thereby reducing system error. However, it should be noted that the LM431CCZ may come at a slightly higher cost.

2. KA431AZBU Substitution Conclusion The KA431AZBU is also a viable substitute for the TL431ILPG. Its basic specifications—voltage range, current capability, and package—match those of the original device, while its accuracy (±1%) falls between the original part and the LM431CCZ. In most general-purpose applications, such as switch-mode power supply feedback loops or voltage monitoring circuits, the KA431AZBU delivers better voltage accuracy than the TL431ILPG. However, if the circuit demands extremely tight reference tolerance (e.g., better than ±1%), a higher-accuracy variant should be selected instead.

Analysis ID: 5E61-DB49000

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