Original Part
Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±0.5% 100 mA TO-92-3
Alternative Part
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.25% 100 mA TO-92-3
1. KA431LZTA Substitution Conclusion
This part can serve as a substitute, but design adjustments are required. The KA431LZTA is identical to the original part in its core electrical parameters (adjustable 2.495V reference, 36V withstand voltage, 100mA output current) and package. The primary difference lies in its typical cathode operating current (Ikat) of 1mA, which is higher than the original part's 700µA. During substitution, the upper bias resistor must be recalculated and reduced in value to ensure sufficient cathode current is supplied. Failure to do so may prevent the reference voltage from establishing correctly or degrade its accuracy. Additionally, its specified typical temperature coefficient of 50ppm/°C provides extra data; this is typically not a concern in applications with less stringent temperature stability requirements.
2. TL1431ACZ-AP Substitution Conclusion
Electrical substitution is feasible, but package compatibility is questionable and temperature performance requires evaluation. The TL1431ACZ-AP offers an advantage with its superior reference voltage accuracy (±0.25%) compared to the original part (±0.5%). There are two key differences: First, its nominal reference voltage is 2.5V (slightly different from the original 2.495V, though the ranges overlap within their respective tolerances); this minor variance is acceptable for most applications. Second, its temperature coefficient is 90ppm/°C. If the original design is sensitive to temperature drift, this parameter may be inferior to the KA431LZTA's 50ppm/°C. Its marked package is "TO-92-2", which may not be directly compatible with the original "TO-92-3" package in terms of physical pin count. The actual pinout must be verified to confirm it follows the standard three-terminal TL431 configuration; otherwise, a physical replacement is impossible.
Analysis ID: E640-29F2000
Based on part parameters and for reference only. Not to be used for procurement or production.
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