Original Part
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.5% 100 mA SOT-23-3
Alternative Part
Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.4% 100 mA SOT-23-3
1. AZ431AN-ATRG1 Substitution Conclusion
As a direct and superior replacement for the AN431AN-ATRE1 from the same manufacturer (Diodes Incorporated) and product family, the AZ431AN-ATRG1 offers full compatibility. Both devices share identical core electrical parameters (adjustable voltage range: 2.5V-36V, output current: 100mA, cathode current: 1mA) and package (SOT-23-3). The key improvement lies in the reference voltage tolerance, which is tightened from ±0.5% to ±0.4%. This results in higher initial output voltage accuracy for the AZ431, reducing system initial error, while the temperature coefficient (20ppm/°C) remains unchanged. This substitution is fully compatible both electrically and mechanically, delivering equivalent or better performance.
2. LM431SACM3X Substitution Conclusion
While the LM431SACM3X is a physical drop-in replacement in terms of basic functionality and package, it represents a performance downgrade and requires careful evaluation. Two core differences are critical: First, its initial accuracy (tolerance) is significantly relaxed to ±2%, leading to greater output voltage variation within a single lot. This may exceed the design margin in high-precision reference or threshold circuits. Second, its typical temperature coefficient increases to 50ppm/°C, approximately 2.5 times that of the original part. This means its output voltage will exhibit significantly greater drift over the operating temperature range, degrading system temperature stability. This part is only suitable for low-cost, non-critical applications where initial accuracy and temperature stability are not stringent requirements.
Analysis ID: E8A6-6D5C000
Based on part parameters and for reference only. Not to be used for procurement or production.
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