1. KA431LZTA Substitution Conclusion The KA431LZTA can serve as a highly compatible direct replacement for the original TL431BILPRE3. Both share identical core performance parameters, including a 2.495V reference, 36V operating range, 100mA output capability, and ±0.5% initial accuracy. The differences are as follows: First, the cathode operating current (Iref(KA)) has increased from a typical 700µA to 1mA. Under the same operating conditions, this results in slightly higher quiescent current consumption by the KA431LZTA, which may have a minor negative impact on system no-load power consumption. However, most circuit designs incorporate sufficient margin, so this change generally does not affect functionality. Second, the KA431LZTA specifies a typical temperature coefficient of 50ppm/°C, whereas the original part does not provide this specification. This allows for a quantifiable and relatively favorable expectation of output voltage drift across the full temperature range during design. In applications where microampere-level quiescent current is not critical and the stated temperature coefficient is acceptable, this substitution is feasible and reliable.