1 kV avalanche rectifier in an SMA package
The BYG10M-E3/TR3: The BYG10M-/TR3: The Vishay BYG10M-/TR3 is a standard-recovery avalanche diode rated for 1000 V reverse voltage and 1.5 A average rectified current, housed in a DO-214AC (SMA) surface-mount package. The avalanche construction means it can safely clamp and dissipate reverse-energy transients without failing — a key difference from a plain rectifier that would break down destructively under the same surge. This part is used in power-supply secondary rectification, snubber networks, flyback clamp circuits, and any 1 kV-class DC bus where the load can kick back energy.
4 µs reverse recovery — what it rules out
The reverse recovery time is 4 µs, which classifies this as a standard-recovery (>500 ns) diode. That trr is fine for 50/60 Hz mains rectification, bulk capacitor charging, and DC bus freewheeling at line-frequency rates. It is not suited for high-frequency switch-mode power supplies running above a few tens of kHz — the recovery tail would cause excessive switching loss and ringing. For a 100 kHz PFC boost or LLC converter, look at an ultrafast or SiC diode instead. The 1 µA reverse leakage at 1000 V is tight for a 1.5 A part and helps keep standby power low.
Forward drop and thermal budget
Maximum forward voltage is 1.15 V at 1.5 A, 25 °C junction. At 1.5 A that is about 1.7 W conduction loss — the SMA package dissipates that comfortably on a standard FR-4 pad, but the junction temperature must stay within the -55°C to 150°C operating range. The DO-214AC (SMA) footprint is shared with many 1 A to 2 A rectifiers, so this part drops into existing layouts without a board spin.