Original Part
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.4% 100 mA TO-92-3
Alternative Part
1. AS431IAZTR-G1 Substitution Conclusion
Direct substitution is not recommended due to risks of key parameter degradation or omission. Compared to the original LT1431CZTRPBF, this substitute exhibits poorer initial accuracy (±0.5% vs. ±0.4%) and lacks a specified temperature coefficient, making it difficult to assess or suggesting potentially inferior output voltage stability over temperature. Furthermore, its typical cathode operating current is only 50µA, significantly lower than the original’s 1mA. This implies that in the same application circuit, the dynamic impedance and operating point will shift noticeably, which may lead to deviations in reference voltage stability, loop response, or even basic functionality—necessitating a redesign of the external biasing circuitry.
2. AZ431AZ-ATRE1 Substitution Conclusion
This device is recommended as a direct replacement candidate, with core parameters well matched and some specifications even improved. Compared to the original LT1431CZTRPBF, it offers the same initial accuracy (±0.4%) and a superior temperature coefficient (20ppm/°C vs. 30ppm/°C), resulting in lower output voltage drift over temperature and more stable reference performance across a wide temperature range. Additionally, its typical cathode operating current is also 1mA, identical to the original part. This ensures the same operating point and dynamic characteristics in the existing application circuit without modifying the bias resistors, providing high electrical compatibility.
Analysis ID: 8D59-E6BE000
Based on part parameters and for reference only. Not to be used for procurement or production.
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