TL431BILP Replacement: LM431AIZ, LM431CCZ

Original Part

TL431BILP

onsemi

Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±0.4% 100 mA TO-92 (TO-226)

Alternative Part

LM431AIZ

onsemi

Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±2% 100 mA TO-92-3

LM431CCZ

onsemi

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

1. LM431AIZ Substitution Conclusion In the vast majority of applications requiring a precision voltage reference, the LM431AIZ is not suitable as a direct replacement for the TL431BILP. The core difference lies in its initial accuracy (tolerance), which is significantly degraded from ±0.4% to ±2%. Under identical conditions, the output reference voltage of the LM431AIZ may deviate from its nominal value by a range that is five times greater than that of the original part. This will directly lead to a substantial reduction in system accuracy for circuits dependent on this voltage, such as power supply feedback loops or ADC/DAC references. It is only appropriate for applications with very relaxed requirements for reference voltage precision.

2. LM431CCZ Substitution Conclusion The LM431CCZ can serve as a viable substitute for the TL431BILP and can typically be used without design modifications in most applications. Their key parameters, including output voltage range (2.495V-36V), output current (100mA), and typical temperature coefficient (50ppm/°C), are identical. The primary difference is a slight relaxation in initial accuracy (tolerance) from ±0.4% to ±0.5%. This minor degradation in precision is acceptable for the vast majority of circuits that are not extremely precision-critical and does not affect basic functionality or performance.

Analysis ID: E477-8AF6000

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