Original Part
Alternative Part
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.5% 100 mA SOT-23-3
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.5% 100 mA SOT-23-3
1. ZXRE250BSA-7 Substitution Conclusion
This part is a viable and highly compatible substitute. The two parts share identical core specifications, including reference voltage, tolerance, adjustable range, and package. The key difference lies in the adjust pin bias current (Iref): the original part is rated at 40 µA, while the ZXRE250BSA-7 is approximately 65 µA (this corresponds to the "Current - Cathode: 65 µA" parameter in the datasheet). In an identical application circuit, this substitution will introduce a minor shift in the actual output voltage (typically less than 1%). For the vast majority of applications where absolute precision is not critical—such as error detection or general-purpose comparison—this effect is negligible, and a direct replacement is acceptable. However, if the device is used in a high-precision voltage divider network, it is recommended to recalculate or fine-tune the feedback resistor values based on the new Iref to eliminate systematic error.
2. AN431AN-ATRE1 Substitution Conclusion
A direct substitution is not recommended; a circuit re-evaluation and redesign are required. Although the reference voltage, tolerance, and package are the same, there is one critical discrepancy: the adjust pin bias current (Iref). The original part has an Iref of 40 µA, while the AN431AN-ATRE1 has a typical Iref of 1 mA (indicated by the "Current - Cathode: 1 mA" parameter in its datasheet). Substituting this part would significantly increase the current through the external setting resistors. This leads to higher resistor power dissipation, greater thermal error, and a severe alteration of the voltage divider ratio, causing the output voltage to deviate substantially from the design target. Even though its temperature coefficient (20 ppm/°C) is superior to the original part's 50 ppm/°C, the large Iref disparity makes it unsuitable for a direct drop-in replacement on the existing board. All external resistor values must be recalculated based on the 1 mA Iref, followed by verification for both power dissipation and accuracy.
Analysis ID: 3C58-9572000
Based on part parameters and for reference only. Not to be used for procurement or production.
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