800 V, 3.4 A — single-phase bridge in a through-hole SIP
The BU1208-E3/45: The Vishay BU1208-/45 is a single-phase bridge rectifier rated for 800 V peak reverse voltage and 3.4 A average rectified output current — sized for line-rectified DC supplies in industrial and appliance power stages where the input sees up to 600 VAC nominal with margin for line transients. Housed in the 4-pin isoCINK+ BU SIP, the through-hole package sits upright on the board — the pin pitch matches standard 5.08 mm spacing, so it slots into existing layouts for single-phase bridge footprints without a layout change.
Forward drop and leakage — the thermal budget drivers
Maximum forward voltage is 1.05 V at 6 A peak — this sets the conduction loss per half-cycle. At 3.4 A average, the forward drop sits lower, but the 1.05 V ceiling at the 6 A test point gives the derating curve a known anchor for worst-case junction temperature. Reverse leakage is 5 µA at the full 800 V blocking voltage — negligible at room temperature, but leakage doubles roughly every 10 °C junction rise. In a 105 °C ambient, budget for leakage current that can shift the bias in a high-impedance divider if the bridge feeds a resistive tap.
Active production — compliance and sourcing
RoHS3 compliant — the /45 suffix confirms lead-free plating and no restricted substances above the threshold.