Taiwan Semiconductor Corporation GBU405H

Overview

GBU405H from Taiwan Semiconductor is a 4A, 600V AEC-Q101 qualified standard bridge rectifier in GBU package, featuring 1500VRMS dielectric strength, 150A surge rating (8.3ms), and 4°C/W junction-to-case thermal resistance - used in automotive-grade SMPS and lighting power supplies.

For engineers reviewing the GBU405H datasheet, GBU405H pinout, GBU405H application, or GBU405H equivalent, key selection criteria include peak reverse voltage (600V), forward current (4A), AEC-Q101 qualification status, thermal resistance (R_θJC = 4°C/W), and UL recognition (E-326243).

Technical Context

This quad-configuration bridge rectifier integrates four silicon diodes in a single GBU molded package with matte tin-plated leads. It supports repetitive peak reverse voltages up to 600V and delivers 4A average forward current at case temperatures ≤75°C, with derating to zero at 150°C junction temperature.

Thermal performance is defined by R_θJA = 20°C/W (free air) and R_θJC = 4°C/W, enabling high-power dissipation in compact PCB layouts. Reverse leakage remains ≤5µA at 25°C and ≤500µA at 125°C per diode under rated V_RRM.

Key Specifications

Pinout & Package

Package: GBU - molded plastic case with 4-pin inline terminal configuration (AC1, AC2, +, –), UL 94V-0 rated, 4.0g weight, matte tin-plated leads compliant with J-STD-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU405, the GBU405H adds automotive-grade reliability validation without altering electrical performance; versus GBU605, it trades current headroom and thermal margin for smaller size and lower cost in 4A-constrained designs.

Availability

GBU405H is available at Aetrix Electronics and suitable for automotive onboard chargers, industrial LED drivers, medical adapters, and appliance SMPS requiring stable component supply with AEC-Q101 assurance and UL safety recognition.

Supply support for GBU405H 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, serving automotive, industrial, and consumer markets since 1979.

The GBU series was designed specifically for high-reliability AC/DC conversion in space-constrained, thermally demanding power supplies - emphasizing ruggedness, safety certification, and consistent parametric performance across temperature.

FAQ

What is the peak repetitive reverse voltage rating of the GBU405H?

The GBU405H has a peak repetitive reverse voltage (V_RRM) rating of 600 V. This value is confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version M2103), where GBU405 is explicitly assigned 600 V under the V_RRM column. The "H" suffix does not alter this voltage rating - it denotes AEC-Q101 qualification only.

Is the GBU405H pin-compatible with the GBU405?

Yes, the GBU405H is fully pin-compatible with the GBU405. Both share identical GBU package dimensions, terminal layout (AC1, AC2, +, –), mechanical outline, and soldering specifications (matte tin-plated leads per J-STD-002). The sole difference is AEC-Q101 qualification - no PCB layout change is needed when upgrading from GBU405 to GBU405H.

What is the maximum junction temperature for the GBU405H?

GBU405H has a maximum junction temperature (T_J) of +150°C, as specified in the Absolute Maximum Ratings section of the Taiwan Semiconductor datasheet. This rating applies across the full operating range and is supported by its thermal resistance values: R_θJC = 4°C/W and R_θJA = 20°C/W, enabling reliable operation in high-ambient environments when properly heatsinked.

Does the GBU405H meet halogen-free and RoHS requirements?

Yes, the GBU405H complies with both RoHS Directive 2011/65/EU and halogen-free requirements per IEC 61249-2-21. This is explicitly stated in the FEATURES section of the official datasheet, which notes "RoHS Compliant" and "Halogen-free according to IEC 61249-2-21" - applicable to all GBU40xH variants including GBU405H.

What is the forward voltage drop of the GBU405H at 4A and 25°C?

The forward voltage drop (V_F) of the GBU405H is 1.1 V per diode at I_F = 4 A and T_J = 25°C, as specified in the Electrical Specifications table. Since the GBU405H is a full-wave bridge, total conduction loss across two conducting diodes in series equals 2.2 V at full load - a key parameter for calculating power dissipation and thermal design.