Original Part
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.5% 100 mA SOT-23-3
Alternative Part
Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±0.5% 100 mA SOT-23-3
1. KA431SAMFTF Substitution Conclusion
Direct substitution is not recommended; it may be considered for non-critical circuits with relaxed performance requirements only after careful evaluation. Key deviations include: a nominal output voltage of 2.495V (a 5mV offset from the original 2.5V), reduced initial accuracy of ±1% (versus the original ±0.5%), and a typical temperature coefficient increased to 50ppm/°C (versus the original 20ppm/°C). This part exhibits significantly inferior absolute voltage reference accuracy and temperature stability compared to the original. In circuits reliant on a precision reference voltage—such as high-accuracy ADC/DAC references or power supply feedback loops—its use may degrade overall system precision. Furthermore, its SOT-23F-3 flat-lead package requires verification for PCB pad compatibility.
2. TL431BCDBZRG4 Substitution Conclusion
This device is a suitable direct replacement for the vast majority of applications and is the preferred substitution option. Only two minor differences exist: the nominal output voltage is 2.495V (a slight 5mV deviation from the original 2.5V), and the required cathode operating current is 600µA (versus the original 1mA). Its core performance parameters—accuracy, output voltage range, and current capability—are fully aligned with the original. The lower cathode operating current is advantageous for reducing power dissipation. The 5mV voltage deviation falls well within the ±0.5% accuracy tolerance and typically does not impact circuit functionality. The package is identical to the original, allowing for a drop-in replacement.
Analysis ID: A2FE-B036000
Based on part parameters and for reference only. Not to be used for procurement or production.
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