Vishay General Semiconductor - Diodes Division GBU8M-E3/51

Overview

GBU8M-E3/51 from Vishay General Semiconductor is a glass passivated single-phase bridge rectifier with 1000 V maximum repetitive peak reverse voltage (VRRM), 8.0 A average forward rectified output current at TC = 60 °C, and 200 A peak forward surge current (IFSM). It features 1.0 V forward voltage drop at 8.0 A, 5 μA reverse leakage at 25 °C, and is rated for operation from –55 °C to +150 °C junction temperature - used in AC/DC full-wave rectification for switching mode power supplies and industrial adapters.

For engineers reviewing the GBU8M-E3/51 datasheet, GBU8M-E3/51 pinout, GBU8M-E3/51 application, or GBU8M-E3/51 equivalent, key selection criteria include VRRM rating, thermal resistance (RθJC = 4.0 °C/W), PCB-mount thermal derating behavior, and UL recognition (E54214) for safety-critical AC-input stages.

Technical Context

The GBU8M-E3/51 implements a standard in-line single-phase bridge configuration with four silicon diodes arranged as two anti-parallel pairs across AC inputs and DC outputs. Its glass passivation ensures stable reverse characteristics up to 1000 V and low IR (5 μA at 25 °C), while the GBU case supports direct heatsink mounting via #6 screws and silicone thermal compound.

Thermal performance is defined by RθJC = 4.0 °C/W (case-to-junction) and RθJA = 20 °C/W (junction-to-ambient, PCB-mounted with 12 mm × 12 mm copper pads). The device meets JESD 22-B106 solderability (275 °C, 10 s) and JESD 201 Class 1A whisker resistance, with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102.

Key Specifications

Pinout & Package

Package: GBU case - molded thermosetting plastic housing with UL 94 V-0 flammability rating, 0.720"–0.740" length, 0.290"–0.310" width, 0.190"–0.210" height, and beveled corner indicating positive DC output lead.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bridge rectifier applications.

Compared with GBU8K-E3/51 and W08M, the GBU8M-E3/51 delivers highest reverse voltage margin among GBU8x family variants and unique UL safety listing - making it preferred for globally certified, high-transient AC-input applications where both electrical robustness and regulatory compliance are mandatory.

Availability

GBU8M-E3/51 is available at Aetrix Electronics and suitable for switching mode power supplies, industrial adapters, and home appliance control boards requiring stable component supply, long-lifecycle support, and consistent RoHS-compliant manufacturing.

Supply support for GBU8M-E3/51 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and optoelectronics with emphasis on reliability, efficiency, and industry-standard compliance.

The GBU8M-E3/51 belongs to Vishay's GBU-series glass-passivated bridge rectifiers - engineered for high-surge, high-voltage AC/DC conversion in cost-sensitive yet safety-critical power supply applications.

FAQ

What is the maximum junction temperature rating for GBU8M-E3/51?

The GBU8M-E3/51 has a maximum operating junction temperature (TJ max.) of +150 °C, as specified in the Vishay datasheet Document Number 88616. This rating allows reliable operation in high-ambient environments such as enclosed industrial enclosures or thermally dense power supply designs. Derating curves show usable output current down to 3.9 A at TA = 40 °C for PCB-mounted configurations. Thermal design must respect RθJC = 4.0 °C/W when heatsink-mounted.

Does GBU8M-E3/51 meet UL safety certification?

Yes, the GBU8M-E3/51 carries UL recognition file number E54214, confirming compliance with UL 60950-1 and IEC 62368-1 safety standards. This certification applies specifically to the GBU8M variant with E3 suffix and validates its dielectric strength (1500 VRMS), flammability rating (UL 94 V-0), and construction suitability for end-equipment safety approvals. Certification is documented in Vishay's official datasheet revision dated 10-Jul-2020.

What is the forward voltage drop of GBU8M-E3/51 at rated current?

The GBU8M-E3/51 exhibits a maximum instantaneous forward voltage drop (VF) of 1.0 V per diode at IF = 8.0 A and TA = 25 °C. Since the bridge conducts through two diodes in series during each half-cycle, the total conduction drop across the output path is approximately 2.0 V. This value directly determines conduction losses and thermal loading in the rectifier stage of the GBU8M-E3/51-based power supply.

How is thermal management implemented for GBU8M-E3/51 in high-power applications?

For high-power use, the GBU8M-E3/51 is designed for bolt-down mounting onto an aluminum plate heatsink using #6 screws and silicone thermal compound - achieving RθJC = 4.0 °C/W. When PCB-mounted without a heatsink (0.5" × 0.5" copper pads), RθJA = 20 °C/W limits usable current to 3.9 A at TA = 40 °C. Mounting torque must not exceed 10 cm-kg, with recommended torque at 5.7 cm-kg to ensure mechanical integrity without case cracking.

What packaging format is used for GBU8M-E3/51?

The GBU8M-E3/51 is supplied in paper tray packaging (package code "51") with a base quantity of 250 units per tray, as specified in Vishay's ordering information table. This format supports automated pick-and-place assembly and is distinct from tube packaging ("45" code, 20 units/tube). The E3 suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads and halogen-free molding compound.