Original Part
Alternative Part
Shunt Voltage Reference IC Adjustable 2.5V 37 VV -0.6%, +0.4% 100 mA TO-92-3
1. LM431CCZ/NOPB Substitution Conclusion
The LM431CCZ/NOPB can serve as a replacement for the TL431BCLPE3, as both are Texas Instruments shunt-adjustable voltage references with compatible core parameters: similar output voltage ranges (2.5V vs. 2.495V) and maximum voltages (37V vs. 36V), identical output current capability of 100mA, and the same TO-92-3 package. Key differences include an increase in cathode current from 600µA to 1mA, which may result in slightly higher quiescent power consumption in low-power applications and could impact overall efficiency. The tolerance is asymmetric at -0.6%/+0.4%, compared to the original symmetrical ±0.5%, though overall accuracy remains comparable. Additionally, the LM431 specifies a typical temperature coefficient of 50ppm/°C, offering improved temperature stability, whereas this parameter is not specified for the original part. Substitution is feasible, but power dissipation and temperature characteristics should be validated in the design, particularly in precision or low-power circuits.
2. TL431ACZ Substitution Conclusion
The TL431ACZ can replace the TL431BCLPE3, as the basic functionality is consistent: adjustable output voltage (fixed at 2.495V), 36V maximum voltage, 100mA output current, 600µA cathode current, and the same TO-92-3 package (despite ambiguous references to TO-92-2 in some datasheets, the actual standard package is identical). The primary difference is a loosened tolerance from ±0.5% to ±1%, which reduces reference voltage accuracy and may introduce larger errors in applications with stringent voltage precision requirements. Other parameters, such as temperature coefficient, are not specified, potentially resulting in inferior stability compared to the original part. Substitution is acceptable in general-purpose applications, such as non-precision voltage regulation or switching power supplies, but careful evaluation of accuracy requirements is advised to avoid compromising system performance.
Analysis ID: 9601-6F0E000
Based on part parameters and for reference only. Not to be used for procurement or production.
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