Taiwan Semiconductor Corporation GBU604-K

Overview

GBU604-K from Taiwan Semiconductor is a 6A, 400V standard single-phase bridge rectifier in GBU package, featuring 175A non-repetitive surge current capability, 1.1V max forward voltage at 6A/25°C, and <5µA reverse leakage at rated voltage and 25°C - used in AC/DC front-end conversion for compact switching mode power supplies.

For engineers reviewing the GBU604-K datasheet, GBU604-K pinout, GBU604-K application, or GBU604-K equivalent, key selection criteria include peak reverse voltage (400V), thermal resistance (R_θJA = 21°C/W), junction temperature range (–55°C to +150°C), and UL recognition (E-326243) for safety-compliant power designs.

Technical Context

The GBU604-K integrates four silicon diodes in a single-phase full-wave bridge configuration with quad internal layout, enabling direct AC-to-DC conversion without external interconnection. Its 211pF junction capacitance per diode at 1MHz/4V supports stable high-frequency operation in SMPS input stages.

Thermally, it delivers R_θJC = 2°C/W to the case and R_θJA = 21°C/W in free-air mounting, allowing reliable 6A continuous conduction up to 125°C ambient when heatsinked. The device is rated for 1500V_RMS dielectric strength between case and terminals.

Key Specifications

Pinout & Package

Package: GBU - molded plastic case with matte tin-plated leads, UL 94V-0 rated, 4.0g weight, 0.56 N·m max mounting torque.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU6K and KBU6K, the GBU604-K offers verified UL recognition, tighter thermal resistance (21°C/W), and documented halogen-free compliance - critical for certified, thermally constrained, and environmentally regulated power designs.

Availability

GBU604-K is available at Aetrix Electronics and suitable for switching mode power supplies, AC/DC adapters, and LED driver applications requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.

Supply support for GBU604-K 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 global power, industrial, and consumer markets since 1979.

The GBU604-K belongs to TSC's standard bridge rectifier product line, engineered for cost-effective, high-reliability AC/DC front-end conversion in space-constrained, safety-certified power systems.

FAQ

What is the maximum operating temperature for the GBU604-K?

The GBU604-K has a specified junction temperature range of –55°C to +150°C. Its maximum continuous operating case temperature depends on thermal design: at 6A load with R_θJA = 21°C/W, ambient must be ≤70°C for safe operation without heatsinking. Derating curves in the datasheet define precise current limits above 25°C ambient.

Does the GBU604-K require a heatsink in typical 6A applications?

The GBU604-K can operate at 6A without an external heatsink only if ambient temperature remains ≤45°C and PCB copper area exceeds 1.5 cm² per lead. For sustained 6A operation at 70°C ambient or higher, a heatsink or thermal pad is recommended to maintain junction temperature below 150°C per its absolute maximum rating.

Is the GBU604-K pin-compatible with other GBU-series bridge rectifiers?

Yes - all GBU-series devices including GBU604-K, GBU605-K, GBU606-K, and GBU607-K share identical GBU package dimensions, lead pitch, and 4-pin pinout (AC1, AC2, +, –). Voltage rating differences do not affect mechanical or electrical interface compatibility.

What does the "-K" suffix indicate in GBU604-K?

The "-K" suffix in GBU604-K denotes tape-and-reel packaging per Taiwan Semiconductor's ordering convention. However, the datasheet specifies tube packing (20 per tube) for GBU6x-K parts. This reflects internal part-numbering alignment rather than actual reel packaging - GBU604-K ships in tubes unless custom reel packaging is separately ordered.

How does the GBU604-K's junction capacitance impact EMI in SMPS designs?

The GBU604-K exhibits 211pF junction capacitance per diode at 1MHz/4V. This parasitic capacitance contributes to common-mode noise coupling during reverse recovery. In high-frequency SMPS, pairing it with an X-capacitor and common-mode choke helps suppress EMI generated by this capacitance-driven displacement current.