Taiwan Semiconductor Corporation GBU406

Overview

GBU406 from Taiwan Semiconductor is a 4A, 800V rated standard bridge rectifier in GBU package, configured as a quad-diode full-wave rectifier with 150A surge capability and 150°C max junction temperature. It delivers reliable AC-to-DC conversion in compact PCB-mounted power supplies.

For engineers reviewing the GBU406 datasheet, GBU406 pinout, GBU406 application, or GBU406 equivalent, key selection factors include its 800V repetitive peak reverse voltage, 4A average forward current rating, thermal resistance (R_θJC = 4°C/W), and AEC-Q101 qualification option (GBU406H).

Technical Context

The GBU406 integrates four silicon diodes in a single-phase full-bridge configuration, enabling efficient unidirectional conduction from AC input to DC output without external wiring. Its 800V V_RRM supports high-line universal input designs, while the 150A I_FSM (8.3ms) withstands transient surges common in SMPS startup and line disturbances.

Thermally optimized for surface-mount or through-hole PCB assembly, the GBU package provides R_θJA = 20°C/W and R_θJC = 4°C/W, allowing sustained 4A operation at case temperatures up to 95°C. Dielectric strength is rated at 1500V_RMS between case and terminals.

Key Specifications

Pinout & Package

Package: GBU - Molded plastic body (UL 94V-0), matte tin-plated leads, 4.0 g weight, polarity marked on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU406, GBU8K offers double the current rating but lacks automotive qualification, while GBPC1208 provides greater thermal headroom at the cost of footprint compatibility-making GBU406 optimal for space-constrained, cost-sensitive 4A applications requiring AEC-Q101 readiness.

Availability

GBU406 is available at Aetrix Electronics and suitable for switching mode power supplies, AC/DC adapters, LED lighting drivers, and industrial control power supplies requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance.

Supply support for GBU406 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in rectifiers, TVS diodes, MOSFETs, and bipolar transistors.

The GBU406 belongs to TSC's standard bridge rectifier product line, engineered for high-reliability, cost-effective AC/DC front-end conversion in consumer, industrial, and automotive-qualified power systems.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for GBU406?

The GBU406 has a V_RRM of 800 V, verified per Taiwan Semiconductor's M2103 datasheet. This rating ensures safe operation under worst-case AC line conditions including 265 VAC input plus transient overvoltage. The value is specific to GBU406 and differs from other members of the GBU401–GBU407 family, such as GBU405 (600 V) and GBU407 (1000 V). GBU406 is not interchangeable with lower- or higher-voltage variants without circuit revalidation.

Does GBU406 have AEC-Q101 qualification?

The base GBU406 is not AEC-Q101 qualified; however, the variant GBU406H is explicitly certified to AEC-Q101. Per the ordering information in the datasheet, the "H" suffix denotes automotive-grade qualification, including stress testing for temperature cycling, humidity, and mechanical shock. GBU406H shares identical electrical specs and package with GBU406 but adds traceability, extended test coverage, and lot-level documentation required for automotive use.

What is the forward voltage drop (V_F) of GBU406 at full rated current?

At I_F = 4 A and T_J = 25°C, the GBU406 exhibits a maximum forward voltage drop of 1.1 V per diode, as specified in the Electrical Specifications table. This value reflects worst-case conduction loss across the internal quad-diode structure and directly impacts thermal design-contributing ~4.4 W total dissipation at full load. The typical V_F is lower, but system thermal analysis must use the 1.1 V max value.

Can GBU406 be used in surface-mount applications?

Yes, GBU406 uses the GBU package with matte tin-plated leads that are solderable per J-STD-002, supporting both through-hole and surface-mount assembly. While traditionally mounted via axial leads, its lead geometry and thermal profile allow reflow-compatible SMT placement when used with appropriate pad layout and stencil design. Thermal performance remains valid in either configuration, with R_θJC = 4°C/W enabling effective heatsinking in either mounting style.

What is the junction-to-case thermal resistance (R_θJC) of GBU406?

The GBU406 has a specified R_θJC of 4°C/W, measured from junction to case under standardized test conditions. This low value enables efficient heat transfer to an external heatsink or copper plane, supporting continuous 4 A operation at case temperatures up to 95°C. Engineers must ensure mechanical contact integrity and thermal interface material (if used) to realize this performance-actual board-level R_θJA will vary based on copper area and airflow.