Original Part
Alternative Part
1. AZ431AZ-ATRG1 Substitution Conclusion
The AZ431AZ-ATRG1 is compatible with the original TL431ACLPR in basic functionality and package outline, making it a viable substitute. However, key differences must be noted: its reference voltage accuracy (±0.4%) and typical temperature coefficient (20ppm/°C) are significantly better than those of the original part (±1%). In applications requiring higher voltage precision and improved temperature stability, it may offer superior performance. On the other hand, its minimum cathode operating current (1mA) is higher than that of the original (600µA). If the original circuit operates with a cathode current between 600µA and 1mA, direct substitution could prevent the AZ431 from starting up or maintaining a stable reference. It is essential to verify that the actual cathode current exceeds 1mA; otherwise, the external bias resistors must be adjusted.
2. TL431CLPRPG Substitution Conclusion
The TL431CLPRPG is compatible with the original TL431ACLPR in package and basic functionality and can serve as a substitute. However, its key performance parameters are noticeably degraded: reference voltage accuracy (±2.2%) is significantly lower than the original (±1%), and its typical temperature coefficient (50ppm/°C) is inferior. After substitution, overall system output voltage accuracy and temperature stability will be compromised. This substitute is only suitable for applications with relaxed reference accuracy requirements. Additionally, its minimum cathode operating current (1mA) is higher than the original (600µA), posing a risk of unreliable startup at low‑current operating points in the original design. Prior to replacement, it must be confirmed that the circuit’s cathode current meets its requirement.
Analysis ID: 7AC8-416E000
Based on part parameters and for reference only. Not to be used for procurement or production.
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