TL431BVLPRAG Replacement: AZ431BZ-ATRE1, AS431BZTR-E1

Original Part

TL431BVLPRAG

onsemi

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

Alternative Part

AZ431BZ-ATRE1

Diodes Incorporated

Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.8% 100 mA TO-92

AS431BZTR-E1

Diodes Incorporated

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

1. AZ431BZ-ATRE1 Substitution Conclusion As a direct replacement, the AZ431BZ-ATRE1 is viable and offers comparable or superior performance in the vast majority of applications. The differences are as follows: the slight variance in its nominal reference voltage (2.5V) versus the original part (2.495V) falls within the typical tolerance band for TL431-type devices and can generally be considered equivalent. Its initial accuracy (±0.8%) is lower than the original's (±0.4%), which may result in slightly poorer absolute output voltage accuracy at room temperature; this requires careful evaluation for circuits with extremely stringent precision requirements for the reference point. However, its temperature coefficient (20ppm/°C) is significantly better than the original's (50ppm/°C), meaning its output voltage exhibits less drift and better stability over a wide temperature range. Except for applications with strict requirements for initial absolute accuracy, this part is an excellent alternative.

2. AS431BZTR-E1 Substitution Conclusion The AS431BZTR-E1 can serve as a substitute in cost-sensitive applications or those where high precision is not critical, but a reduction in accuracy must be accepted. The differences are similar to those of the AZ part: the reference voltage is equivalent, and the temperature coefficient (20ppm/°C) is superior. However, the most critical difference is its further degraded initial accuracy of ±1%. This results in the greatest room-temperature output voltage dispersion, leading to the largest initial error tolerance when used as a reference source in a circuit. It is suitable for applications with relaxed requirements for supply voltage or feedback threshold accuracy, where cost or temperature stability is a higher priority—such as voltage monitoring in some consumer products or feedback in standard isolated power supplies. It should not be used directly in measurement or data acquisition systems requiring a high-precision reference.

Analysis ID: 63DF-9676000

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