735 mV forward drop at 20 A — the conduction loss number
The STPS40M80CT is a dual Schottky rectifier from STMicroelectronics, pairing two 20 A diodes in a common-cathode configuration inside a single TO-220-3 through-hole package.
Rated for 80 V DC reverse maximum, this part suits 48 V bus rails, 60 V battery systems, and power supplies with a healthy derating margin. The junction temperature rating of 175 °C maximum allows operation in tight thermal enclosures or high-ambient industrial environments, provided the heatsink keeps Tj below that ceiling. Reverse leakage is 65 µA at 80 V and 25 °C junction — expect it to rise with temperature, so budget the standby loss in a hot chassis accordingly.