Schottky barrier, 40 V blocking, 2 A forward — the conduction loss floor
The CRS20I40A(TE85L,QM: The CRS20I40A is a 40 V, 2 A Schottky rectifier in a SOD-123F surface-mount package.
Fast recovery and junction temperature ceiling
Recovery time is specified as ≤500 ns at >200 mA forward current — fast enough for switching supplies in the 50–100 kHz range where reverse-recovery losses in a standard rectifier would hurt efficiency. The maximum junction temperature is 150 °C, so the thermal design must keep Tj below that at the worst-case ambient plus self-heating.
Reverse leakage and capacitance — the off-state trade-offs
Reverse leakage is 60 µA at 40 V — typical for a 40 V Schottky. At elevated junction temperature leakage rises exponentially, so a design running near 150 °C should budget for higher standby loss. Junction capacitance is 35 pF at 10 V, 1 MHz — low enough that switching losses from capacitive discharge are negligible at moderate frequencies.