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. AS431ANTR-E1 Substitution Conclusion
This device can serve as a replacement, but attention must be paid to package compatibility. The AS431ANTR-E1 outperforms the original part in key electrical parameters: its reference accuracy (±0.5% vs. ±1%) and temperature coefficient (20ppm/°C vs. 50ppm/°C) are both superior, resulting in more precise system output voltage and reduced sensitivity to temperature variation. Moreover, its cathode operating current (1mA) matches the original part exactly, allowing the circuit operating point to remain unchanged. The primary difference lies in the package. The original device uses a “SOT-23-3 Flat Leads” (SOT-23F-3) package with straight leads, whereas the AS431ANTR-E1 comes in a standard “SOT-23-3” package with gull-wing leads. If the PCB pads are designed for the original package, direct substitution may risk soldering or placement issues. A manufacturability assessment is recommended before implementation.
2. AS431IANTR-G1 Substitution Conclusion
Direct substitution is not recommended due to risk of critical parameter mismatch. Although the AS431IANTR-G1 offers better reference accuracy (±0.5%) than the original part, its key deviation is the cathode operating current—only 50µA, significantly lower than the original’s 1mA. This parameter is critical for ensuring proper startup and stable operation of a shunt regulator in the circuit. A 20-fold difference could prevent the circuit from functioning correctly or cause it to operate outside the intended region if substituted directly. Additionally, its temperature coefficient is not clearly specified, casting doubt on performance consistency, and the same package mismatch issue mentioned above applies. Unless the circuit is recalculated and validated accordingly, direct replacement should be avoided.
Analysis ID: AE12-D424000
Based on part parameters and for reference only. Not to be used for procurement or production.
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