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 TL431IZ-AP is not suitable as a direct substitute for the TL431ILPRPG. The core issue lies in its TO-92-2 (TO-226AC) package, which is physically incompatible with the original TO-92-3 (TO-226AA) pinout, preventing direct installation on the same PCB footprint. Additionally, its key parameter—temperature coefficient—is not clearly specified, leaving its output voltage drift over temperature unknown. This introduces a risk of performance degradation or uncertainty in applications requiring temperature stability. Although its accuracy (±2.21% vs. ±2.2%) and basic functionality are comparable, the rigid physical incompatibility and lack of critical performance data preclude it from being a reliable drop-in replacement.
2. LM431BCZX Substitution Conclusion
The LM431BCZX is a fully compatible and performance-enhanced substitute for the TL431ILPRPG. Both devices are from the same manufacturer, onsemi, and share the identical TO-92-3 (TO-226AA) package, ensuring complete physical pin and mounting compatibility. Electrically, the LM431BCZX offers a superior reference accuracy of ±1%, significantly better than the original ±2.2%, providing lower initial output voltage error and a more precise reference. It maintains a typical temperature coefficient of 50 ppm/°C, matching the temperature stability of the original part. With identical interface, core functionality, and improved key specifications, this part represents a direct and superior replacement option.
Analysis ID: 9852-8FB1000
Based on part parameters and for reference only. Not to be used for procurement or production.
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