Original Part
Alternative Part
1. TL431IZ Substitution Conclusion
The TL431IZ is electrically equivalent to the TL431CLP in all key parameters (2.495V reference, 36V withstand voltage, 100mA output capability), with negligible difference in tolerance (±2.21% vs ±2.2%). However, a potential mechanical incompatibility exists: the indicated TO-226-2/TO-92-2 package may differ from the original TO-226-3/TO-92-3 in pinout or physical structure (e.g., pin sequence or thermal design). The mechanical package specifications must be verified prior to direct substitution to avoid installation errors or incorrect electrical connections.
2. LM431ACZ Substitution Conclusion
The LM431ACZ can serve as a functional substitute. Its nominal reference voltage is slightly higher (2.5V vs. 2.495V) but remains within the specified tolerance (±2%), resulting in minimal practical impact. A key advantage is its explicitly specified temperature drift (50ppm/°C), which may offer superior voltage stability over the original unspecified part in wide-temperature environments. The package (TO-92-3) is fully compatible. Nevertheless, if the circuit is sensitive to the absolute reference voltage value (e.g., in precision voltage divider ratios), the slight nominal offset should still be validated in the design.
Analysis ID: 8961-1CC0000
Based on part parameters and for reference only. Not to be used for procurement or production.
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