Hyperfast rectifiers reduce switching losses and increase efficiency

Vishay Intertechnology, Inc. has expanded its Gen 7 platform of 1200V FRED Pt Hyperfast rectifiers with four new devices in the eSMP series, in the SlimSMA HV (DO-221AC) package. Optimised for industrial and automotive applications, the 1A and 2A rectifiers not only offer the best trade-off between reverse recovery charge (Qrr) and forward voltage drop for devices in their class but also deliver the lowest junction capacitance and recovery time.

The Vishay Semiconductors rectifiers include the VS-E7JX0112-M3 and VS-E7JX0212-M3, as well as AEC-Q101 qualified VS-E7JX0112HM3 and VS-E7JX0212HM3. To reduce switching losses and increase efficiency, the devices combine fast recovery times of 45ns with Qrr down to 105nC (typical), forward voltage drop of 1.45V, and junction capacitance of 2.5pF. The robust rectifiers offer a non-repetitive peak surge current of up to 21A in a compact package measuring 2.6mm x 5.2mm, with a low profile of 0.95mm, compared to 2.3mm for the competing SMA package with a similar footprint. Combined with a minimum 3.2mm creepage distance and moulding compound with a comparative tracking index (CTI) ≥600 (Material Group I), the devices decrease component counts and lower BOM costs based on IEC 60664-1 requirements for high voltage applications.

The devices will serve as clamp, snubber, and freewheeling diodes in flyback auxiliary power supplies and high-frequency rectifiers for bootstrap driver functionality, while providing desaturation protection for the latest fast-switching IGBTs and high-voltage Si/SiC MOSFETs. Typical applications for the devices include industrial drives and tools, on-board chargers and motors for EV, energy generation and storage systems, and Ćuk converters and industrial LED SEPIC circuitry.

The rectifiers feature a planar structure and platinum-doped lifetime control, which guarantee system reliability and robustness without compromising performance. Their optimised stored charge and low recovery current minimise switching losses and reduce power dissipation. RoHS-compliant and halogen-free, the devices feature a Moisture Sensitivity Level of 1 in accordance with J-STD-020 and offer high-temperature operation up to +175C.