Original Part
Alternative Part
1. TL431BILPRAG Substitution Conclusion
The TL431BILPRAG can fully replace the FAN431AZXA and offers superior performance in certain aspects. Both devices share essentially identical key parameters (output voltage range, output current, temperature coefficient, package, and pinout). However, the TL431BILPRAG provides a significantly higher initial accuracy (±0.4%) compared to the original device’s ±1%. In the same circuit, the TL431BILPRAG delivers higher reference voltage accuracy, which can improve overall system performance (e.g., power supply feedback loop stability, voltage monitoring precision) without requiring changes to the external design. It should be noted that the higher accuracy typically comes with a slightly higher cost, but for most applications this represents a direct upgrade replacement.
2. TL431CLPRAG Substitution Conclusion
The TL431CLPRAG can functionally replace the FAN431AZXA, but the accuracy requirements must be evaluated. The electrical characteristics (output voltage range, current capability, temperature coefficient) and package compatibility (the TO-92-3 long-body package is generally mechanically compatible with the original TO-92-3 formed-lead version) are similar. However, the TL431CLPRAG has an initial accuracy of ±2.2%, which is notably lower than the original device’s ±1%. In applications demanding higher voltage accuracy (e.g., precision voltage regulation, ADC reference), direct substitution may increase system error or degrade performance. In accuracy-insensitive scenarios (such as overvoltage protection threshold setting), it can be used normally. If substitution is chosen, the circuit’s tolerance to voltage error should be verified.
Analysis ID: 6ED3-BC82000
Based on part parameters and for reference only. Not to be used for procurement or production.
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