Original Part
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.5% 100 mA SOT-23-3
Alternative Part
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.4% 100 mA SOT-23-3
1. LM431SCCM32X Substitution Conclusion
The LM431SCCM32X presents a limited risk as a direct substitute, requiring application-specific evaluation. The primary deviations from the original part are its reference voltage nominal value (2.495V vs. 2.5V) and typical temperature coefficient (50ppm/°C vs. 20ppm/°C). The minor voltage difference may introduce a fixed offset in the system output within precision circuits relying on absolute reference values or specific voltage divider ratios. It is necessary to verify if this deviation falls within the application's tolerance window. The higher temperature coefficient indicates greater output voltage drift with ambient temperature variation. In applications with wide operating temperature ranges or high precision requirements, the overall system temperature performance will degrade and may fail to meet the original design specifications. If the application is not stringent on absolute voltage value and temperature stability, and the package, operating voltage, and current capability are compatible, it can serve as a substitute. However, thorough bench testing of key parameters is strongly recommended prior to system integration.
2. AZ431AN-ATRE1 Substitution Conclusion
The AZ431AN-ATRE1 is an excellent and recommended direct substitute, offering electrical compatibility and performance that is equal to or superior to the original part. The only core difference is its initial accuracy (±0.4% vs. ±0.5%), where the AZ part provides a more precise reference voltage at room temperature, constituting a performance enhancement. Both parts are fully aligned on all critical parameters: reference voltage (2.5V), temperature coefficient (20ppm/°C), package, and key electrical specifications. This variance ensures the circuit will, at minimum, maintain its original accuracy post-substitution, with a high probability of improvement. There is no risk of performance degradation or compatibility issues due to parameter mismatch, making it typically suitable for a direct drop-in replacement.
Analysis ID: 17A0-459F000
Based on part parameters and for reference only. Not to be used for procurement or production.
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