Original Part
Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±2% 100 mA TO-236AB
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
Substitution is feasible but requires careful evaluation. The ZXRE250BSA-7 offers superior key parameters compared to the original part (accuracy ±0.5% vs. ±2%), and its extremely low cathode current (65 µA vs. 1 mA) presents a significant advantage in power-sensitive applications like battery-powered systems. However, this very low cathode current means its dynamic response and load driving capability may differ from the original. Direct substitution could shift the operating point or degrade stability in existing circuits sensitive to bias current or transient response. Therefore, the bias resistor network must be recalculated and tested prior to replacement.
2. AN431AN-ATRE1 Substitution Conclusion
An excellent and directly interchangeable upgrade option. The AN431AN-ATRE1 is fully compatible with the original TL431IDBZR in core electrical parameters—package, output voltage range, maximum output current, and cathode operating current (1 mA)—ensuring a true drop-in replacement in existing circuits. Furthermore, it provides comprehensive performance upgrades: higher initial accuracy (±0.5% vs. ±2%) and a well-defined low temperature coefficient (20ppm/°C). This results in a more precise reference voltage and reduced thermal drift after replacement, directly enhancing overall circuit performance without requiring modifications to the external circuit design.
Analysis ID: 8FB4-B89A000
Based on part parameters and for reference only. Not to be used for procurement or production.
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