Original Part
Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±0.5% 100 mA TO-92-3
Alternative Part
1. AZ431AZ-ATRE1 Substitution Conclusion
The AZ431AZ-ATRE1 is a highly viable and performance-equivalent substitute for the TL431BILPRE3, suitable for direct replacement in most applications. The primary differences are: 1) Its nominal reference voltage is 2.5V (vs. 2.495V for the TI part), but the actual voltage ranges under their respective tolerances (±0.4% vs. ±0.5%) overlap significantly, resulting in negligible impact on circuit performance; 2) The minimum cathode operating current is 1mA (vs. 700µA for TI), leading to slightly weaker stability under extremely light loads and marginally higher quiescent power dissipation; 3) It provides a typical temperature drift parameter of 20ppm/°C, which is not specified for the TI part, offering greater reference value for stability assessment in temperature-sensitive applications. In summary, this part matches or exceeds the original part in electrical performance, with the sole trade-off of slightly increased power consumption, making it a highly feasible substitute.
2. AZ431BZ-ATRE1 Substitution Conclusion
The AZ431BZ-ATRE1 can serve as a lower-cost alternative to the TL431BILPRE3, but the impact on system accuracy must be carefully evaluated. Its core differentiator is a significantly reduced precision (tolerance) of ±0.8% (compared to ±0.5% for the original part). This results in a larger initial error range for its output voltage, potentially making it unsuitable for applications requiring high absolute accuracy of the reference voltage. Other characteristics, such as reference voltage (2.5V), cathode current (1mA), and temperature drift (20ppm/°C), are identical to the AZ431AZ-ATRE1. If the target circuit has relaxed requirements for reference accuracy (e.g., sufficient error margin) and can tolerate the slightly higher quiescent current, this part presents an economical alternative; otherwise, direct substitution is not recommended.
Analysis ID: 4436-97BD000
Based on part parameters and for reference only. Not to be used for procurement or production.
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