Original Part
Alternative Part
1. TL431ACZ Substitution Conclusion
The TL431ACZ (ST) matches the original part (TI) in all key electrical parameters, including output voltage range, accuracy, and maximum current. Both devices are offered in a TO-92-3 package, making the ST version a viable direct replacement in most standard applications. A notable discrepancy lies in the datasheet notation: the ST part lists its package as “TO-226-2, TO-92-2 (TO-226AC),” which may indicate subtle mechanical differences in lead forming or package standards (such as lead pitch) compared to TI’s TO-226AA. It is essential to verify the actual package dimensions and pin arrangement. If sufficient PCB clearance is provided or through-hole mounting is used, this difference is generally not an issue; however, it could pose a compatibility risk in automated assembly processes.
2. TL431ACLPG Substitution Conclusion
The TL431ACLPG (onsemi) is functionally compatible with the original part and can serve as a direct replacement. It offers a clear advantage by specifying a typical temperature drift of 50ppm/°C, providing greater confidence in applications requiring temperature stability. Two differences should be considered: first, its typical cathode operating current (Ika) is 1mA, higher than the original part’s 600µA. This may require re-evaluating reference voltage stability under very low-power or low-current operating conditions. Second, the device is listed in a “TO-92-3 Long Body” package, which could introduce slight variations in height or profile compared to the original—mechanical clearance should be confirmed. Overall, this substitute offers more transparent performance data and may represent an improved alternative, provided low-current operation is verified.
Analysis ID: DD27-EE43000
Based on part parameters and for reference only. Not to be used for procurement or production.
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