Original Part
Alternative Part
1. TL431BCLP Substitution Conclusion
The TL431BCLP can serve as a direct replacement for the TL431BILP, as both are adjustable shunt voltage reference ICs from the same series manufactured by onsemi. Their key parameters are identical: reference voltage 2.495V, tolerance ±0.4%, typical temperature coefficient 50ppm/°C, maximum output voltage 36V, and cathode operating current 1mA. Both are supplied in the TO-92-3 (TO-226) package. The only minor distinction is that the TL431BILP datasheet notes "Long Body" in the package description, whereas the TL431BCLP does not emphasize this detail. In practice, however, the physical dimensions and pinout are typically the same, with no impact on electrical performance or mechanical installation. The TL431BCLP is fully compatible in functionality, performance, and package, and can be used as a drop‑in replacement.
2. TL1431IZ Substitution Conclusion
The TL1431IZ from STMicroelectronics requires careful evaluation as a potential substitute. Key differences include: a nominal reference voltage of 2.5V (slightly higher than the original 2.495V), a temperature coefficient of 100ppm/°C (inferior to the original 50ppm/°C), and a package designation of TO-226AC (though similar in outline to TO-92-3, there may be slight mechanical specification variations). In applications demanding high‑precision voltage reference or stable operation over a wide temperature range, the TL1431IZ could degrade output voltage accuracy and increase temperature drift. Additionally, package differences may affect mechanical compatibility. If the application is not sensitive to voltage accuracy and temperature drift, and mechanical compatibility has been verified, the TL1431IZ may be considered as an alternative. Otherwise, a part with matching electrical parameters is recommended.
Analysis ID: 883B-3927000
Based on part parameters and for reference only. Not to be used for procurement or production.
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