Original Part
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.25% 100 mA TO-92-3
Alternative Part
1. AS431IAZTR-G1 Substitution Conclusion
Direct substitution is not viable; this part can only be considered for non-critical applications where initial accuracy and temperature stability are not stringent. The key differences are a twofold reduction in initial accuracy (±0.5% vs. ±0.25%) and the absence of a specified temperature coefficient (Tempo). Consequently, the output voltage drift over temperature is unknown and unguaranteed. While its lower cathode current (50µA) can help reduce power consumption, in a design originally biased for a 600µA cathode current, this may lead to a slight shift in the reference operating point or changes in linearity. Substitution will degrade overall system accuracy and temperature stability; a careful assessment against the final product specifications is required.
2. AS431BZTR-E1 Substitution Conclusion
Conditional substitution is feasible, provided the lower initial accuracy is acceptable and the bias circuit is re-evaluated. The primary deviation is a significantly reduced initial accuracy (±1% vs. ±0.25%). However, its temperature coefficient (20ppm/°C Typical) is substantially better than the original part (90ppm/°C), potentially resulting in smaller output voltage variation over a wide temperature range. Its cathode current requirement is 1mA, which is 1.67 times that of the original part (600µA). This necessitates that the supply circuit must be capable of delivering a higher minimum operating current; otherwise, the reference will fail to regulate properly. This also increases the system's no-load power dissipation. Substitution mandates a recalculation of the bias resistors to ensure the minimum operating current requirement is met.
Analysis ID: CBB5-3509000
Based on part parameters and for reference only. Not to be used for procurement or production.
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