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 fully replace the original TL431AILPRAG. Both devices are from the same manufacturer, onsemi, and utilize the identical TO-92-3 package, ensuring pin compatibility and physical fit. Key parameters such as output voltage range (2.495V–36V), output current (100mA), temperature coefficient (50 ppm/°C), and cathode current (1mA) are essentially equivalent. The primary improvement is a tighter reference voltage tolerance, improved from ±1% to ±0.5%. This substitution provides higher reference accuracy and is a direct, performance‑enhanced drop‑in replacement for most applications, requiring no circuit modifications.
2. TL1431ACZ‑AP Substitution Conclusion
The feasibility of substituting the TL1431ACZ‑AP for the original TL431AILPRAG is low. The primary obstacle is package incompatibility (TO‑92‑2 vs. TO‑92‑3), which may prevent proper physical mounting and pin connection. Electrically, the reference voltage shows a slight deviation (2.5V vs. 2.495V), and while the tolerance is superior (±0.25% vs. ±1%), the temperature coefficient is worse (90 ppm/°C vs. 50 ppm/°C), indicating reduced temperature stability that could impact performance over a wide temperature range. Additionally, its lower cathode current requirement (600 µA vs. 1mA) may shift the circuit operating point. This substitution should be approached with caution and is only suitable where package adaptation and relaxed temperature performance are acceptable; otherwise, a circuit redesign would be necessary.
Analysis ID: 6B78-EBFF000
Based on part parameters and for reference only. Not to be used for procurement or production.
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