Original Part
Alternative Part
Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±2.21% 100 mA TO-92-3
1. TL431AIZ-AP Substitution Conclusion
The TL431AIZ-AP is fully compatible with the original part in terms of core functionality, voltage range, tolerance (±1%), and package, making it a suitable drop-in replacement. The key difference lies in its cathode operating current (Icat), which has a typical value of 700µA compared to 1mA for the original part. In the same application circuit, the TL431AIZ-AP requires a lower minimum bias current from cathode to anode, which helps reduce system quiescent power consumption—a beneficial characteristic. Under extreme operating conditions (e.g., low temperature, low input voltage), the lower Icat may affect dynamic response or minimum operating current margin. This difference is negligible for the vast majority of standard applications, but if the original design operates near the Icat threshold, verification is recommended.
2. TL431IZ-AP Substitution Conclusion
The TL431IZ-AP is compatible in core functionality, voltage range, and package, and can serve as a functional substitute. Its primary deviation is an initial tolerance of ±2.21%, which is notably wider than the original part’s ±1%. In the same circuit, this results in a broader initial output voltage accuracy range. For applications requiring high precision—such as voltage reference, threshold detection, or feedback loops—this tolerance degradation may introduce greater system error. It is therefore necessary to evaluate whether this reduced accuracy falls within the allowable error budget of the target application. If the application is not sensitive to absolute reference voltage accuracy (e.g., general power supply feedback), substitution is acceptable. However, for precision measurement or calibration uses, direct replacement is not recommended.
Analysis ID: 28F6-4446000
Based on part parameters and for reference only. Not to be used for procurement or production.
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