Original Part
Alternative Part
1. TL431AILPRAG Substitution Conclusion
From the perspective of core functionality and package, the TL431AILPRAG can serve as a direct replacement for the AS431BZTR-G1. Both are adjustable shunt references with identical output voltage ranges, output current capabilities, and tolerances. The differences are as follows: First, the reference voltages differ. The TL431AILPRAG has a typical reference voltage of 2.495V, compared to 2.5V for the AS431BZTR-G1. This 5mV deviation falls within the ±1% tolerance of both parts and is negligible for the vast majority of applications. However, caution is advised if the design imposes stringent requirements on the absolute reference value. Second, the typical temperature coefficients differ significantly. The TL431AILPRAG exhibits 50ppm/°C, which is notably higher than the 20ppm/°C of the AS431BZTR-G1. In applications with severe ambient temperature fluctuations, the TL431AILPRAG will demonstrate greater output voltage drift with temperature, potentially affecting overall system accuracy and temperature drift performance. This substitution requires careful evaluation for wide-temperature-range or high-precision applications. For general-purpose voltage regulation, feedback, or protection circuits, the substitution is typically viable.
2. FAN431AZXA Substitution Conclusion
The substitution conclusion for the FAN431AZXA relative to the AS431BZTR-G1 is identical to that for the TL431AILPRAG, as their key parameters—including the 2.495V reference voltage and 50ppm/°C temperature coefficient—are exactly the same. They can be considered different part number codes for the same die. The FAN431AZXA is also a pin-compatible direct replacement option. Its core differences from the original part similarly lie in the slightly lower typical reference voltage and the inferior temperature coefficient. The considerations for application are precisely the same: the minor difference in reference voltage is generally acceptable under tolerance coverage, but its higher temperature coefficient is the primary performance shortcoming compared to the original part. This may become a limiting factor in designs demanding high temperature stability. For general-purpose applications, this substitution is feasible.
Analysis ID: 7DFD-1A6D000
Based on part parameters and for reference only. Not to be used for procurement or production.
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