Original Part
1. LM431BCZX Substitution Conclusion
From the perspective of core electrical parameters and package, the LM431BCZX can serve as a conditional substitute. It matches the original part (TL431BCLPRMG) exactly in output voltage range (2.495V-36V), output current (100mA), temperature coefficient (50ppm/°C typical), and package (TO-92-3). The key difference lies in initial accuracy (tolerance): the original part is rated at ±0.4%, whereas the LM431BCZX is ±1%. A direct board-level replacement will result in a wider initial error band for the system's reference voltage. For applications where reference voltage precision is not critical—such as general voltage monitoring, error amplifiers, or non-precision regulation—this variance is generally acceptable. However, in circuits demanding high-precision references or measurement accuracy, this substitution may degrade overall system performance, requiring a careful assessment against design specifications.
2. LM431BIZX Substitution Conclusion
The substitution conclusion for the LM431BIZX is identical to that of the LM431BCZX: it is a conditional replacement. It shows no deviation from the original part or the LM431BCZX in key parameters (output voltage, current, temperature drift, and package). The discrepancy, again, is in initial accuracy: the LM431BIZX is specified at ±1%, compared to the original's ±0.4%. This difference directly implies a reduction in the precision grade of the circuit's reference value after substitution. In applications with stringent requirements on the absolute accuracy of the 2.495V reference—such as high-precision power supplies or test equipment references—this substitute may not be suitable. For most general-purpose circuits, however, like switch-mode power supply feedback loops or logic-level conversion threshold setting, where ±1% tolerance is a common specification, the substitution is viable.
Analysis ID: EEE3-B1EE000
Based on part parameters and for reference only. Not to be used for procurement or production.
SkyChip © 2026, Email: sales@skychip.com