Vishay General Semiconductor - Diodes Division GBU8D-M3/51

Overview

GBU8D-M3/51 from Vishay General Semiconductor is a glass passivated single-phase bridge rectifier in GBU package, rated for 200 V repetitive peak reverse voltage (VRRM), 8.0 A average forward output current (IF(AV)), and 200 A non-repetitive surge current (IFSM). It delivers 1.0 V forward voltage drop at 8.0 A per diode and supports general-purpose AC/DC full-wave rectification in power supplies and consumer electronics.

For engineers reviewing the GBU8D-M3/51 datasheet, GBU8D-M3/51 pinout, GBU8D-M3/51 application, or GBU8D-M3/51 equivalent, key selection criteria include VRRM = 200 V, IF(AV) = 8.0 A at TC = 60 °C, thermal resistance RθJC = 4.0 °C/W, IR ≤ 5 μA at 25 °C, and halogen-free RoHS-compliant M3 termination.

Technical Context

The GBU8D-M3/51 integrates four silicon diodes in a single-phase full-wave bridge configuration with in-line terminal arrangement and polarity marked on the case. Its glass passivation ensures stable reverse leakage (IR ≤ 5 μA at 25 °C) and high dielectric strength (1500 VRMS case isolation).

Designed for PCB mounting with 0.5" × 0.5" copper pads and 9.5 mm lead length, it operates across -55 °C to +150 °C junction temperature range and exhibits 68 pF typical junction capacitance per diode at 4 V / 1 MHz - critical for EMI-sensitive switching-mode power supply inputs.

Key Specifications

Pinout & Package

Package: GBU case - molded plastic housing with matte tin-plated leads, UL 94 V-0 rated, halogen-free (M3 suffix), and JESD 201 Class 1A whisker compliant. Dimensions: 22.3 mm × 18.8 mm × 7.9 mm (L × W × H), with beveled corner indicating positive output terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU8D-E3/51 and KBU8D, the GBU8D-M3/51 provides halogen-free construction and superior thermal resistance (4.0 °C/W), making it preferred for EU-regulated consumer electronics and thermally demanding adapter applications where long-term reliability under sustained load is critical.

Availability

GBU8D-M3/51 is available at Aetrix Electronics and suitable for monitor power supplies, desktop PC adapters, audio amplifier PSUs, and home appliance control boards requiring stable component supply and halogen-free compliance.

Supply support for GBU8D-M3/51 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 and industrial-grade performance.

The GBU series was developed for high-current, high-surge AC/DC bridge rectification in cost-sensitive yet thermally demanding consumer and computing power supplies - prioritizing ruggedness, manufacturability, and safety certification.

FAQ

What is the maximum junction temperature rating for GBU8D-M3/51?

The GBU8D-M3/51 has a specified operating junction temperature range of -55 °C to +150 °C. This +150 °C maximum allows sustained operation under high ambient or high-power conditions when properly heatsinked. Derating curves in the Vishay datasheet (Document Number 88616) define allowable IF(AV) reduction above TC = 60 °C. Thermal design must ensure the actual junction temperature of the GBU8D-M3/51 remains within this limit during worst-case load and ambient conditions.

Does GBU8D-M3/51 support surface-mount assembly?

No, the GBU8D-M3/51 uses through-hole leads in the GBU package and is designed for PCB mounting with 0.375" (9.5 mm) lead length and 0.5" × 0.5" copper pads. It is not a surface-mount device and requires wave soldering or hand soldering. The package outline drawing confirms axial lead configuration with no SMT-compatible footprint. For SMT alternatives, engineers should evaluate discrete diode bridges like the VS-GBU8M or other SMD-rectifier families - not the GBU8D-M3/51 itself.

What does the "M3" suffix mean in GBU8D-M3/51?

The "M3" suffix in GBU8D-M3/51 indicates halogen-free, RoHS-compliant construction meeting JEDEC J-STD-020 and JESD 201 Class 1A whisker test requirements. Unlike the E3 variant, M3 uses bromine- and chlorine-free molding compounds and matte tin plating without lead-free exemptions that permit halogens. This makes GBU8D-M3/51 suitable for environmentally regulated markets including EU WEEE and China RoHS II, where halogen content restrictions apply.

Can GBU8D-M3/51 replace GBU8D-E3/51 in an existing design?

Yes, GBU8D-M3/51 is a direct functional and mechanical replacement for GBU8D-E3/51, sharing identical electrical ratings (VRRM = 200 V, IF(AV) = 8.0 A), package dimensions, pinout, and solderability. The only difference is halogen-free material content (M3) versus standard RoHS (E3). No PCB layout or thermal redesign is needed. However, verify compatibility with your soldering process's thermal profile, as M3's halogen-free compound may exhibit slightly different reflow characteristics than E3.

What is the typical junction capacitance of GBU8D-M3/51 per diode?

The typical junction capacitance (CJ) of GBU8D-M3/51 is 68 pF per diode, measured at 4 V reverse bias and 1 MHz. This value impacts high-frequency noise coupling and EMI filter design in the AC input stage. Because the GBU8D-M3/51 contains four diodes in bridge configuration, total input-to-output capacitance is not simply additive - system-level EMI testing is recommended. The 68 pF figure is confirmed in Vishay's Electrical Characteristics table (Document Number 88616, page 2).