TL431AILPME3 Replacement: AS431BZTR-G1, AZ431AZ-ATRG1

Original Part

TL431AILPME3

Texas Instruments

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

Alternative Part

AS431BZTR-G1

Diodes Incorporated

Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±1% 100 mA TO-92

AZ431AZ-ATRG1

Diodes Incorporated

Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.4% 100 mA TO-92

1. AS431BZTR-G1 Substitution Conclusion From a key parameter perspective, the AS431BZTR-G1 aligns closely with the original part in terms of reference voltage (2.5V vs. 2.495V), tolerance (±1%), maximum output voltage (36V), and output current (100mA). It also provides a well-defined typical temperature drift coefficient (20ppm/°C), which is an advantage over the original part that lacked a specified drift rating. However, note that its cathode operating current is 1mA, higher than the original's 700µA. Under the same bias conditions, this results in slightly higher power dissipation, which may impact efficiency in low-power designs. Overall, if the circuit is not sensitive to the absolute reference voltage value and power consumption, and can tolerate a slightly higher cathode current, the AS431BZTR-G1 can serve as a direct replacement. It offers a particular advantage in applications requiring a clearly specified temperature drift parameter.

2. AZ431AZ-ATRG1 Substitution Conclusion The AZ431AZ-ATRG1 is compatible with the original part in reference voltage (2.5V vs. 2.495V), voltage withstand capability, and current handling. Its tolerance is improved to ±0.4% (superior to the original's ±1%), and it provides a well-defined low temperature drift coefficient (20ppm/°C). These characteristics make it significantly better than the original part in terms of accuracy and temperature stability. However, its cathode current is also 1mA, higher than the original's 700µA, which may lead to additional losses in low-power applications. In summary, this part fully meets and even exceeds the performance of the original part in accuracy and temperature drift specifications. Provided the circuit can accommodate the higher cathode current requirement, the AZ431AZ-ATRG1 is a high-performance substitute, especially suitable for designs demanding higher voltage reference accuracy and temperature stability.

Analysis ID: 5E25-1FA8000

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