1. TS431IYLT Substitution Conclusion The TS431IYLT can serve as a conditional functional substitute. The key differences are as follows: It has lower initial accuracy (±2% vs. ±1.5%), which results in a larger output voltage tolerance and may be unsuitable for applications demanding tight reference voltage precision. Its output current capability is higher (30mA vs. 15mA), offering greater load or shunt drive, which is advantageous in circuits requiring higher operating current. The cathode current is lower (60µA vs. 80µA), aiding in reduced system standby power consumption. It specifies a temperature coefficient (100ppm/°C), whereas the original part does not, providing a basis for stability assessment over the full temperature range. Furthermore, it is AEC-Q100 qualified, making its reliability and typical operating temperature range (-40°C to +125°C) more suitable for harsh environments like automotive or industrial applications. In summary, the TS431IYLT is a viable substitute in applications where initial accuracy is not critical, or where higher drive capability, lower power consumption, and higher reliability are required. However, in designs reliant on the ±1.5% accuracy, direct substitution may lead to system performance deviation.