Original Part
Alternative Part
Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±1% 100 mA TO-236AB
1. LM431SCCMFX Substitution Conclusion
The LM431SCCMFX can serve as a direct drop-in replacement for the original KA431SAMFTF. Both devices are manufactured by onsemi and share the same SOT-23-3 flat-lead package. Their core electrical parameters are identical, including output voltage range (2.495V to 36V), output current (100mA), and typical temperature coefficient (50ppm/°C). The key difference is that the LM431SCCMFX offers higher accuracy, with a reference voltage tolerance of ±0.5% compared to ±1% for the original part. This results in improved stability and precision of the reference voltage without affecting circuit compatibility. In fact, it may enhance system performance, particularly in applications sensitive to accuracy. Other parameters, such as the minimum cathode current (1mA), remain the same, so no circuit modifications are required for a direct substitution.
2. TL431AFDT,215 Substitution Conclusion
The TL431AFDT,215 is a viable substitute, but several key differences must be considered to ensure compatibility. While it shares core specifications with the original KA431SAMFTF—such as output voltage range (2.495V to 36V), output current (100mA), and tolerance (±1%)—notable variations exist. Its cathode current is lower (600µA vs. 1mA for the original), which may reduce power consumption in low-power designs but requires verification that the original circuit’s bias current is sufficient for proper operation. Additionally, the temperature coefficient is not explicitly specified in the available parameters (compared to the original’s typical 50ppm/°C), which could affect temperature stability; consulting the detailed datasheet is recommended. Mechanically, the TO-236AB package is generally pin-compatible with SOT-23-3, but physical fit should be confirmed. This device also carries AEC-Q100 automotive-grade qualification, making it suitable for high-reliability environments, though this feature is not essential for non-automotive applications. Overall, substitution is feasible if the application is not sensitive to temperature coefficient variations and the difference in cathode current is acceptable.
Analysis ID: 2773-C6C8000
Based on part parameters and for reference only. Not to be used for procurement or production.
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