Alternative Part
1. TL431ACLPG Substitution Conclusion
The TL431ACLPG is a fully compatible substitute for the original KA431AZBU, with identical key electrical parameters. Both are 2.495V adjustable shunt voltage references from the same manufacturer (onsemi), sharing the same output voltage range (2.495V to 36V), output current capability (100mA), reference terminal operating current (1mA), and typical temperature coefficient (50ppm/°C). The only distinction lies in the package description: the TL431ACLPG is specified as "TO-92-3 Long Body," while the KA431AZBU is listed as "TO-92-3 (TO-226AA)." This represents a minor physical variation or revision within the same standard TO-92 package family. The pinout and mechanical dimensions are compatible, allowing for a direct pin-for-pin replacement on the PCB with identical mounting and soldering, requiring no circuit or layout modifications.
2. TL431BCLP Substitution Conclusion
The TL431BCLP can substitute for the original KA431AZBU and represents a performance upgrade. The core functionality, voltage/current ranges, temperature coefficient, and package (TO-226-3, TO-92-3) are the same for both parts. The primary technical difference is the initial accuracy (tolerance): the TL431BCLP offers a significantly tighter ±0.4% specification compared to the ±1% of the KA431AZBU. The TL431BCLP provides a more precise reference voltage closer to the ideal 2.495V, thereby reducing overall system error attributable to reference voltage deviation. This substitution is particularly beneficial for analog circuits, precision power supplies, or measurement circuits demanding higher voltage accuracy, as it will improve performance consistency. However, this upgrade typically comes at a slightly higher cost.
Analysis ID: 90EA-7E9C000
Based on part parameters and for reference only. Not to be used for procurement or production.
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