Vishay General Semiconductor - Diodes Division GBU4A-E3/51

Overview

GBU4A-E3/51 from Vishay General Semiconductor is a glass passivated single-phase bridge rectifier in GBU package, rated for 4.0 A average forward current, 50 V maximum repetitive peak reverse voltage, and 150 A non-repetitive surge current. It delivers low 1.0 V forward voltage drop at 4.0 A and exhibits only 5 μA reverse leakage at 25 °C, supporting reliable AC/DC conversion in compact power supplies.

For engineers reviewing the GBU4A-E3/51 datasheet, GBU4A-E3/51 pinout, GBU4A-E3/51 application, or GBU4A-E3/51 equivalent, key selection criteria include its 50 V VRRM rating, 4.0 A IF(AV) at TC = 100 °C, 150 A IFSM capability, 1.0 V VF at rated current, and UL E54214 recognition - all critical for cost-sensitive, space-constrained consumer and industrial rectification designs.

Technical Context

The GBU4A-E3/51 implements a standard full-wave bridge configuration with four silicon diodes arranged in a single-phase in-line layout. Its glass passivation ensures stable junction characteristics under thermal cycling and humidity exposure, while the GBU case provides mechanical robustness and 1500 VRMS dielectric strength between case and terminals.

Designed for PCB mounting with 12 mm × 12 mm copper pads and 9.5 mm lead length, it operates across –55 °C to +150 °C junction temperature range and achieves 4.2 °C/W junction-to-case thermal resistance when heatsink-mounted - enabling predictable thermal management in unregulated or lightly regulated offline supplies.

Key Specifications

Pinout & Package

Package: GBU - molded plastic case with matte tin-plated leads, UL 94 V-0 rated, 0.720–0.740 inch (18.3–18.8 mm) length, 0.190–0.210 inch (4.83–5.33 mm) width, 0.130–0.140 inch (3.30–3.56 mm) height. Polarity marked on body: beveled corner indicates positive output terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU4A-E3/51, GBU4A-E3/45 offers identical performance in a smaller packaging format ideal for evaluation, while KBU4A provides functional equivalence in a mechanically distinct package requiring PCB redesign - making GBU4A-E3/51 optimal for new designs prioritizing density, thermal performance, and high-volume logistics.

Availability

GBU4A-E3/51 is available at Aetrix Electronics and suitable for monitor power supplies, printer SMPS input stages, and audio equipment AC adapters requiring stable component supply, RoHS compliance, and UL-recognized reliability.

Supply support for GBU4A-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 application-specific optimization.

The GBU series was developed for cost-effective, high-surge-capability AC/DC front-end rectification in consumer electronics and industrial controls - balancing thermal performance, safety certification, and manufacturability in through-hole packages.

FAQ

What is the maximum operating junction temperature for GBU4A-E3/51?

The GBU4A-E3/51 has a specified operating junction temperature range of –55 °C to +150 °C. This allows reliable operation in environments such as enclosed power supplies or near heat-generating components. Derating curves in the Vishay datasheet show that at TC = 100 °C, the device sustains 4.0 A average forward current - confirming its suitability for thermally constrained layouts where GBU4A-E3/51 is mounted on an aluminum plate or PCB copper pad.

Does GBU4A-E3/51 require a heatsink for 4.0 A continuous operation?

GBU4A-E3/51 can deliver 4.0 A average forward current only when case temperature (TC) is maintained at ≤100 °C, typically requiring a heatsink or substantial PCB copper area. In free-air mounting (TA = 40 °C), its rated current drops to 3.0 A. Therefore, for sustained 4.0 A operation, GBU4A-E3/51 must be heatsink-mounted or placed on ≥12 mm × 12 mm copper pads - as validated by Vishay's thermal test conditions.

Is GBU4A-E3/51 compatible with lead-free soldering processes?

Yes, GBU4A-E3/51 supports lead-free assembly: its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards, and it withstands solder dip at 275 °C for up to 10 seconds per JESD 22-B106. The E3 suffix confirms RoHS compliance and JESD 201 Class 1A whisker resistance - ensuring compatibility with standard Pb-free reflow and wave solder profiles used in commercial electronics manufacturing.

How does the 1500 VRMS dielectric strength benefit GBU4A-E3/51 in system design?

The 1500 VRMS case dielectric strength of GBU4A-E3/51 ensures safe isolation between AC input terminals and the external case or heatsink, meeting basic insulation requirements for Class I appliances. This eliminates need for additional insulating hardware in designs where the GBU4A-E3/51 case contacts grounded metal chassis - simplifying mechanical integration and reducing bill-of-materials cost in monitors, printers, and home appliances.

Can GBU4A-E3/51 be used in place of higher-voltage variants like GBU4J (600 V)?

No - GBU4A-E3/51 is rated for 50 V VRRM and must not replace higher-voltage variants such as GBU4J (600 V). Substituting GBU4A-E3/51 in a 600 V circuit would cause immediate reverse breakdown and failure. Each GBU variant (A, B, D, G, J, K, M) is electrically distinct; GBU4A-E3/51 is strictly intended for low-voltage AC inputs (e.g., transformer secondaries ≤35 VRMS), not mains-connected applications.