Original Part
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.5% 100 mA SOT-23-3
Alternative Part
1. LM431SBCM32X Substitution Conclusion
Direct substitution is not recommended. Substitution may be considered in non-critical applications only after careful evaluation. The primary differences between the LM431SBCM32X and the original part are its inferior initial accuracy (±1% vs. ±0.5%) and significantly higher minimum cathode operating current (1mA vs. 50µA). For the same nominal 2.5V output, the wider distribution of the output voltage can impact the absolute accuracy of the system reference. The 20x larger cathode current requirement is a critical substitution constraint. The bias circuit supplying the REF pin must be capable of sourcing at least 1mA; otherwise, the device may fail to regulate properly. In low-power or high-impedance divider circuits, this can lead to startup failure or degraded accuracy. A thorough recalculation and adjustment of the external resistor network is mandatory.
2. LM431SCCM32X Substitution Conclusion
This device serves as a reliable, direct or near-direct substitute in the vast majority of applications. The LM431SCCM32X aligns perfectly with the original part's key parameters: its ±0.5% initial accuracy ensures an identical level of reference voltage precision. Its minimum cathode operating current is also 1mA, which matches the LM431SBCM32X and remains the core consideration during substitution. The replacement circuit must supply a cathode bias current of no less than 1mA. If the original design was based on 50µA, resistor values will need adjustment, though this is typically straightforward. Furthermore, it provides a specified typical temperature coefficient (50ppm/°C). This parameter, unspecified in the original part, offers a positive enhancement by making its performance over temperature more predictable.
Analysis ID: 3A20-03C7000
Based on part parameters and for reference only. Not to be used for procurement or production.
SkyChip © 2026, Email: sales@skychip.com