Original Part
Alternative Part
Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±2.21% 100 mA TO-92-3
1. TL431IZ-AP Substitution Conclusion
The conclusion is a cautious substitution with associated risks. The discrepancies are as follows: First, the temperature coefficient parameter is absent; the datasheet does not provide this value. Consequently, the stability of its output voltage over temperature is undefined, potentially introducing additional error in wide-temperature or high-precision applications. Second, its package is described as "TO-226AC," which may differ from the original "TO-226AA" (standard TO-92) in mechanical dimensions and pinout. This poses a risk to physical compatibility, potentially preventing direct installation into the original PCB footprint or causing thermal design mismatches. Substitution should only be considered after thorough verification of these two points (e.g., confirming the actual pin layout and evaluating temperature drift impact).
2. LM431ACZX Substitution Conclusion
The conclusion is a direct substitution with equivalent or superior performance. The differences are: First, the initial tolerance is improved from ±2.2% to ±2%, resulting in lower output voltage dispersion and a more precise reference at room temperature. Second, the nominal reference voltage changes from 2.495V to 2.5V. This is a minor nominal shift whose impact is typically negligible in the standard circuit configuration using an external resistor divider to set the output voltage, as the final output is determined by the resistor ratio. Furthermore, its temperature coefficient (50ppm/°C) matches the original part, and the package (TO-226AA) is fully compatible. This part is a qualified substitute in terms of both electrical performance and physical form factor.
Analysis ID: CD10-A45E000
Based on part parameters and for reference only. Not to be used for procurement or production.
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