Original Part
Alternative Part
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.25% 100 mA TO-92-3
1. KA431LZTA Substitution Conclusion
The KA431LZTA can be used as a direct drop-in replacement for the original TL431ACLPRPG. Both are adjustable shunt voltage references from the same ON Semiconductor product family, sharing identical core specifications (output range, maximum current, package). The primary difference is that the KA431LZTA offers improved initial accuracy of ±0.5% (compared to ±1% for the original part). In applications demanding higher absolute precision for the reference voltage, the KA431LZTA provides a more accurate reference without requiring changes to the external circuitry. Its temperature coefficient (50ppm/°C) remains the same as the original, ensuring equivalent operational stability. Consequently, the performance after substitution will be equal to or better than the original design.
2. TL1431ACZ-AP Substitution Conclusion
The TL1431ACZ-AP can serve as a conditional replacement, but the specific application requirements must be evaluated. There are three key differences: First, its initial accuracy is superior (±0.25%), which is beneficial for improving reference voltage precision. Second, its temperature coefficient is inferior (90ppm/°C, compared to a typical 50ppm/°C for the original). This results in greater output voltage drift over a wide temperature range, potentially making it unsuitable for scenarios with high sensitivity to temperature variation. Third, its cathode operating current is lower (600µA vs. 1mA for the original). This may affect stability under very light loads or necessitate adjustment of the cathode resistor. If the application experiences minimal temperature variation and the circuit can be adapted to the lower cathode current, substitution can be implemented to gain higher accuracy. Otherwise, careful validation of temperature performance is required.
Analysis ID: E818-FA1D000
Based on part parameters and for reference only. Not to be used for procurement or production.
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