Original Part
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±1% 100 mA SOT-23-3
Alternative Part
1. LM431SBCM3X Substitution Conclusion
The LM431SBCM3X can functionally replace the AS431IBNTR-G1, as both are adjustable shunt references with similar output voltage ranges (2.495V/2.5V to 36V), tolerance (±1%), and compatible packages. Key differences include: the LM431SBCM3X has a nominal reference voltage of 2.495V (0.005V lower than the original part), a cathode operating current of 1mA (significantly higher than the original’s 50µA), and a specified typical temperature drift of 50ppm/°C (which is not stated for the original device). For direct substitution, verify whether the circuit is sensitive to the slight deviation in reference voltage. Additionally, the substantially higher cathode current will increase power dissipation, which may impact low-power designs or require adjustment of the current-limiting resistor. The defined temperature drift parameter provides better expectation for temperature stability, but actual in-circuit performance over temperature must be validated to ensure it meets application requirements.
2. LM431SCCM3X Substitution Conclusion
The LM431SCCM3X can serve as a higher-performance alternative, sharing core parameters with the LM431SBCM3X (such as 2.495V reference voltage, 1mA cathode current, and 50ppm/°C temperature drift), while offering improved tolerance of ±0.5% compared to the original part’s ±1%. Substitution may result in higher system accuracy and consistency, making it particularly suitable for applications with stringent voltage reference error requirements. The same considerations apply regarding the slight reference voltage offset and increased power dissipation due to higher cathode current. If the application allows peripheral circuit adjustments to accommodate the higher cathode current and can accept a 2.495V reference value, the LM431SCCM3X offers advantages in both precision and temperature performance.
Analysis ID: 3086-3AA8000
Based on part parameters and for reference only. Not to be used for procurement or production.
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