1. TS431IYLT Substitution Conclusion The substitution is generally feasible, though a slight degradation in precision should be noted. Compared to the TLV431CDBVT, the TS431IYLT differs in the following aspects: its reference voltage tolerance (±2% vs. ±1.5%) is slightly wider, which may result in marginally poorer initial output voltage accuracy in the same circuit; its output current capability (30mA vs. 15mA) is higher, enabling it to drive heavier loads or provide greater shunt current; its cathode current (60µA vs. 80µA) is slightly lower, leading to somewhat lower power dissipation under the same bias conditions, though the bias resistor may require fine-tuning to ensure the minimum operating current. Furthermore, it features automotive-grade (AEC-Q100) qualification and a specified temperature coefficient (100ppm/°C), providing quantifiable assurance in terms of reliability and temperature stability, making it more suitable for automotive or harsh-environment applications. If the application is not stringent on initial accuracy, this part can serve as a high-reliability, high-drive-capability alternative.