Taiwan Semiconductor Corporation GBU605-K

Overview

GBU605-K from Taiwan Semiconductor is a 6A, 600V standard bridge rectifier in GBU package, featuring 175A surge current capability, 2°C/W junction-to-case thermal resistance, and typical reverse leakage <5µA at 25°C. It serves as the AC/DC front-end rectification stage in compact off-line power supplies.

For engineers reviewing the GBU605-K datasheet, GBU605-K pinout, GBU605-K application, or GBU605-K equivalent, key selection criteria include VRRM=600V, IF=6A continuous rating, VF≤1.1V at 6A, RθJC=2°C/W, and UL recognition (E-326243) for safety-compliant designs.

Technical Context

The GBU605-K integrates four silicon diodes in a single-phase full-wave bridge configuration with common-cathode and common-anode terminals externally accessible. Its quad-diode layout enables direct AC input rectification without external interconnection.

Thermally optimized for PCB mounting, it delivers 21°C/W junction-to-ambient resistance under free-air conditions and supports sustained 6A conduction up to 150°C junction temperature, with fusing I²t rating of 127 A²s for transient overload protection.

Key Specifications

Pinout & Package

Package: GBU - Molded plastic case with matte tin-plated leads, UL 94V-0 rated, 4.0 g 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 GBU605 and GBU6J, the GBU605-K provides verified halogen-free construction, lower reverse leakage, and tighter forward voltage control-making it preferred for globally distributed, energy-efficient, and safety-certified power supplies.

Availability

GBU605-K is available at Aetrix Electronics and suitable for switching mode power supplies, lighting drivers, and USB-C adapters requiring stable component supply, long-lifecycle support, and consistent RoHS/halogen-free compliance.

Supply support for GBU605-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 electronics markets since 1979.

The GBU series was developed specifically for cost-sensitive, high-volume AC/DC front-end rectification in compact off-line power converters-balancing surge robustness, thermal performance, and regulatory compliance.

FAQ

What is the maximum repetitive peak reverse voltage (VRRM) of the GBU605-K?

The GBU605-K has a VRRM rating of 600 V, meaning it can safely block up to 600 V of repetitive reverse voltage across each internal diode. This corresponds to a maximum RMS input voltage of 420 V, supporting universal AC input ranges including 240 VAC with margin. The value is explicitly specified in the Absolute Maximum Ratings table for GBU605-K in the official Taiwan Semiconductor datasheet revision E2103.

Does the GBU605-K meet UL safety certification requirements?

Yes, the GBU605-K is UL Recognized under File #E-326243, confirming compliance with UL 60747-1 and related standards for discrete semiconductors. This certification covers dielectric strength (1500 V_RMS isolation), flammability (UL 94V-0), and construction integrity-enabling faster end-product safety approvals. The marking "UL" appears on the device body per documentation.

What is the thermal resistance from junction to case (RθJC) for the GBU605-K?

The GBU605-K has a junction-to-case thermal resistance (RθJC) of 2°C/W, measured under standard test conditions. This low value reflects its optimized internal die attach and leadframe design, enabling efficient heat transfer to an external heatsink or PCB copper area. It is confirmed in the Thermal Performance section of the Taiwan Semiconductor datasheet E2103 and critical for thermal design of high-current rectifier stages.

Is the GBU605-K compatible with lead-free reflow soldering processes?

Yes, the GBU605-K features matte tin-plated leads qualified per J-STD-002 for solderability, and its GBU package is rated for lead-free reflow profiles up to 260°C peak temperature. The molding compound meets UL 94V-0 and is halogen-free per IEC 61249-2-21, ensuring compatibility with modern RoHS-compliant assembly lines without delamination or voiding risks.

How does the reverse leakage current (IR) of the GBU605-K compare at different temperatures?

The GBU605-K specifies IR ≤5 µA at 25°C and ≤500 µA at 125°C under rated reverse voltage, per the Electrical Specifications table. This temperature-dependent increase is inherent to silicon diodes and directly impacts no-load power consumption in standby mode. Designers must account for the 100× rise in IR when sizing auxiliary supplies for high-ambient-temperature applications.