Original Part
Alternative Part
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.5% 100 mA SOT-23-3
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±1% 100 mA SOT-23-3
1. AS431IANTR-G1 Substitution Conclusion
This part can be considered a conditional substitute. The key electrical parameters—adjustable range (2.5V–36V) and accuracy (±0.5%)—are identical to the original part, and the package is pin-compatible, forming the basis for substitution. One discrepancy exists: the values for "Current – Output" and "Current – Cathode" in the respective datasheets are reversed. The original part specifies an output current of 40µA (which is effectively the minimum operating current) and a cathode current of 100mA (the maximum current). In contrast, the AS431IANTR-G1 lists an output current of 100mA and a cathode current of 50µA. This is most likely due to differences in how the two manufacturers define these parameter labels or their test conditions. The actual device's core parameters—"minimum cathode operating current" and "maximum cathode current"—must be verified by consulting each detailed datasheet. Substitution is functionally viable if the AS431I's actual minimum operating current (e.g., Iref) is ≤40µA and its maximum cathode current is ≥100mA. Otherwise, risks may arise under low-current startup or high-load conditions.
2. AS431IBNTR-G1 Substitution Conclusion
This part is a downgraded substitute or suitable for non-critical applications. Its voltage range and package match the original part, meeting the basic substitution criteria. The key difference is its initial accuracy of ±1%, which is inferior to the original's ±0.5%. In circuit design, this translates to a reduction in the absolute accuracy of the reference voltage and, consequently, the accuracy of the system's output voltage or detection threshold. It is therefore not suitable for applications demanding high reference voltage precision, such as precision power supplies or measurement instruments. Furthermore, similar to the AS431IANTR-G1, its current parameter labeling is also reversed compared to the original part. The minimum operating current and maximum cathode current must likewise be verified against the datasheet to ensure they meet the actual circuit requirements. If the application circuit can tolerate the lower reference accuracy (e.g., ±1% is acceptable) and the current parameters are compatible, this part can serve as a lower-cost alternative.
Analysis ID: 7B9D-D4CE000
Based on part parameters and for reference only. Not to be used for procurement or production.
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