Original Part
Alternative Part
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.5% 100 mA SOT-23-3
1. AN431AN-ATRE1 Substitution Conclusion
The AN431AN-ATRE1 can directly replace the original KA431SAMFTF, as their key parameters are highly compatible: output voltage range (2.5V–36V), output current (100 mA), and cathode current (1 mA) are all identical, and the package is compatible (SOT-23-3). The main differences are higher accuracy (±0.5% vs ±1%) and a lower temperature coefficient (20ppm/°C vs 50ppm/°C). The AN431AN-ATRE1 offers superior voltage reference stability and lower temperature drift compared to the original part, making it suitable for applications with stricter accuracy and drift requirements, without requiring any circuit modifications.
2. NCP432BVSNT1G Substitution Conclusion
The NCP432BVSNT1G cannot directly substitute the original KA431SAMFTF due to fundamentally opposite current characteristics: its output current is only 40 µA (compared to 100 mA for the original), while its cathode current is as high as 100 mA (compared to 1 mA for the original). The NCP432BVSNT1G is a shunt reference designed for low power consumption and high cathode drive capability, suitable for micro-current sensing or high-impedance load applications. Direct replacement would result in failure to regulate properly or risk of device damage; the external circuit must be redesigned to accommodate these significant current parameter differences.
Analysis ID: 0BD8-6979000
Based on part parameters and for reference only. Not to be used for procurement or production.
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