Original Part
Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±0.5% 100 mA TO-92-3
Alternative Part
1. AS431IAZTR-G1 Substitution Conclusion
Direct substitution is not recommended. The key discrepancy lies in the cathode operating current: the original part requires 700µA, whereas the AS431IAZTR-G1 typically draws only 50µA. The AS431IAZTR-G1 demands a significantly lower minimum current to start up and maintain a stable reference voltage. If used as a drop-in replacement, the original circuit’s bias conditions may not supply sufficient current at the lower level required by the new device. This could lead to failure to operate properly, degraded dynamic performance, reference voltage instability, or even oscillation risk.
2. AZ431AZ-ATRE1 Substitution Conclusion
Substitution is recommended with expected performance improvement. The differences are in initial accuracy (tolerance) and temperature coefficient. The AZ431AZ-ATRE1 offers ±0.4% tolerance, better than the original part’s ±0.5%, and specifies a typical temperature coefficient of 20ppm/°C—a key parameter not documented for the original device. Consequently, the AZ431AZ-ATRE1 is anticipated to deliver superior, or at least well-defined, performance in terms of long-term stability and temperature-induced drift of the reference voltage. Moreover, its 1mA cathode operating current is in the same order of magnitude as the original 700µA, allowing ample design margin in most applications. Therefore, the risk of compatibility issues with direct replacement is low.
Analysis ID: 5DAC-5B27000
Based on part parameters and for reference only. Not to be used for procurement or production.
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