1. MIC2790N-04VMT-T5 Substitution Conclusion The MIC2790N-04VMT-T5 is similar to the original part TPS3808G25DRVTG4 in functional architecture and package type (both are single-channel supervisor ICs with open-drain output and adjustable reset). However, a key difference lies in the voltage threshold: the original device features a 2.33V threshold, suitable for monitoring typical digital supply rails (such as 2.5V or 3.3V systems), whereas the MIC2790N-04VMT-T5 has a threshold of only 0.4V, designed specifically for ultra-low voltage monitoring applications (e.g., core supplies below 0.8V). If directly substituted, the MIC2790N would release the reset signal prematurely—well before the supply voltage reaches its normal operating range—potentially causing the system to start up under insufficient voltage and introducing stability risks. Substitution is only feasible if the monitored rail matches the 0.4V threshold; otherwise, the two devices are not compatible.