AEC-Q101 standard-recovery rectifier for automotive bias supplies
The Vishay SE50PAJHM3/H is a 600 V, 1.6 A standard-recovery rectifier in the DO-221BC (SMPA) surface-mount package, qualified to AEC-Q101 for automotive applications. It is a general-purpose silicon diode with a reverse recovery time of 2 µs, placing it in the standard-recovery class (>500 ns at >200 mA). The junction temperature range spans -55°C to 175°C, covering under-hood and chassis-domain thermal environments.
600 V blocking, 1.6 A forward — where it fits the power budget
With a 600 V DC reverse voltage rating and 1.6 A average rectified forward current, this part is sized for auxiliary and bias-supply rectification in automotive systems — think DC-DC converter secondary-side rectification, relay and solenoid flyback clamping, or OR-ing diodes in power distribution modules. The 1.16 V forward voltage drop at 5 A gives a conduction-loss ceiling; at the 1.6 A average rating the actual Vf will be lower, but the 5 A point confirms the die can handle surge events well above the continuous rating. Reverse leakage is 10 µA at the full 600 V blocking voltage, which is typical for a 175°C-rated junction — expect leakage to rise with temperature, but the 10 µA figure at 25°C gives a clean baseline for the off-state power dissipation calculation.
2 µs reverse recovery — the switching-speed ceiling
The 2 µs trr confirms this is a standard-recovery, not fast-recovery, diode. In a 50 Hz or 60 Hz line-frequency rectifier the 2 µs recovery is invisible, but in a 100 kHz+ switching supply the recovery losses will dominate. This part belongs in the line-frequency or low-frequency switched stage — input bridge rectification, pre-charge circuits, or DC bus clamping — not the high-side synchronous rectifier position.
DO-221BC (SMPA) — footprint and thermal management
The DO-221BC (SMPA) package has exposed pad — the cathode tab is the thermal path. The board-side copper area under the pad sets the junction-to-ambient thermal resistance; for 1.6 A continuous in a 105°C ambient, a minimum 30 mm x 30 mm copper island on a 2 oz inner layer is typical to keep Tj below 150°C. The SMA Flat Leads profile reduces the package height compared to a standard SMA, which matters in potted or conformal-coated assemblies where clearance is tight.