1. AZ431AZ-ATRG1 Substitution Conclusion The AZ431AZ-ATRG1 can serve as a complete drop-in replacement for the TL431CLPRPG, as both share identical core architecture, package (TO-92), and key electrical parameters (output voltage range 2.5V/2.495V, maximum 36V, output current 100mA, cathode current 1mA). The primary distinctions lie in the AZ431AZ-ATRG1’s higher accuracy (±0.4% vs. ±2.2%) and lower temperature coefficient (20ppm/°C vs. 50ppm/°C). Substituting with the AZ431AZ-ATRG1 will significantly improve system reference voltage stability and reduce temperature drift, making it particularly suitable for applications with stricter voltage accuracy or thermal stability requirements. However, it should be noted that in rare designs relying on lower precision for error compensation, loop response may need to be re-evaluated.