Original Part
Alternative Part
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.25% 100 mA TO-92-3
1. TL1431ACZ-AP Substitution Conclusion
The TL1431ACZ-AP is a direct pin-to-pin and functional replacement for the AS431IAZTR-G1 in terms of physical package and basic regulation. However, significant parametric differences necessitate a careful assessment of circuit conditions before substitution. The key distinctions are as follows: The TL1431ACZ-AP offers superior initial accuracy (±0.25% vs. ±0.5%) and a specified temperature coefficient (90ppm/°C), making it the higher-performance device in terms of precision and thermal stability. Its major drawback is a substantially higher cathode operating current requirement (600 µA vs. 50 µA). Post-substitution, the bias current supplied to the reference must be increased significantly. If the original circuit was designed for a low cathode current—for instance, to minimize standby power—direct replacement may prevent the TL1431 from starting up or cause operational instability, potentially leading to system failure.
2. TL1431CZ-AP Substitution Conclusion
The TL1431CZ-AP can serve as a pin-compatible substitute for the AS431IAZTR-G1, but it offers only marginal performance alignment and carries clear application limitations. The differences are: Its initial accuracy is slightly better (±0.4% vs. ±0.5%), and it provides a specified temperature coefficient. However, this minor accuracy advantage is negated by its exceptionally high cathode operating current demand (1 mA vs. 50 µA). The TL1431CZ-AP imposes the most stringent bias condition requirements among the options considered. A direct replacement carries a high risk of reference failure due to insufficient operating current from the original circuit, making it the highest-risk substitution in this comparison. It should only be considered for non-critical, cost-sensitive applications where sufficient cathode current is already confirmed.
Analysis ID: 8C0C-078B000
Based on part parameters and for reference only. Not to be used for procurement or production.
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