Taiwan Semiconductor Corporation GBU405-K

Overview

GBU405-K from Taiwan Semiconductor is a 4A, 600V repetitive peak reverse voltage (V_RRM) standard single-phase bridge rectifier in GBU package, featuring 150A surge current capability, 1.1V max forward voltage at 4A/25°C, and 45pF junction capacitance per diode. It serves as the AC-to-DC conversion stage in compact off-line power supplies.

For engineers reviewing the GBU405-K datasheet, GBU405-K pinout, GBU405-K application, or GBU405-K equivalent, key selection criteria include V_RRM = 600V, I_F = 4A, thermal resistance R_θJC = 4°C/W, UL recognition E-326243, and RoHS/halogen-free compliance - all critical for SMPS reliability and regulatory alignment.

Technical Context

The GBU405-K integrates four silicon diodes in a single-phase full-wave bridge configuration with quad anode-cathode topology. Its 600V V_RRM rating targets mid-voltage AC inputs (e.g., 230VAC mains with safety margin), while the 150A I_FSM supports transient line surges without failure.

Thermally, it delivers R_θJC = 4°C/W and R_θJA = 20°C/W, enabling operation up to 150°C junction temperature. The 45pF junction capacitance per diode minimizes high-frequency switching noise in PFC and flyback converters.

Key Specifications

Pinout & Package

Package: GBU - molded plastic case with matte tin-plated leads, UL 94V-0 rated, 4.0g weight, designed for through-hole PCB mounting and wave soldering per J-STD-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU406-K and DF04S, the GBU405-K uniquely balances 600V V_RRM, UL recognition, and superior thermal resistance (R_θJC = 4°C/W), making it optimal for certified, thermally demanding 230VAC SMPS designs where over-spec'ing voltage or sacrificing safety is unnecessary.

Availability

GBU405-K is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and LED lighting drivers requiring stable component supply, long-term lifecycle support, and full regulatory documentation.

Supply support for GBU405-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 and protection markets since 1979.

The GBU405-K belongs to TSC's standard bridge rectifier product line, engineered for high-reliability AC-DC front-end conversion in cost-sensitive, safety-certified power systems across consumer, industrial, and lighting applications.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the GBU405-K?

The GBU405-K has a V_RRM of 600 V, as specified in the Absolute Maximum Ratings table. This value is fixed for the GBU405-K variant and distinguishes it from the GBU404-K (400V), GBU406-K (800V), and GBU407-K (1000V) in the same family. It is measured under standard test conditions (T_A = 25°C) and defines the maximum reverse voltage the device can block repeatedly without breakdown. The GBU405-K must not be operated beyond this rating in any design.

Does the GBU405-K have UL recognition, and what is the file number?

Yes, the GBU405-K is UL Recognized with file number E-326243, as confirmed in the Features section and Mechanical Data. This applies to the entire GBU404-K through GBU407-K series. UL recognition covers dielectric strength, flammability (UL 94V-0), and construction - enabling direct use in end products seeking UL/CSA/IEC safety certification without requalification. The GBU405-K carries this recognition by default as part of the qualified family.

What is the forward voltage (V_F) of the GBU405-K at 4A and 25°C?

The GBU405-K exhibits a maximum forward voltage of 1.1 V at I_F = 4 A and T_J = 25°C, per the Electrical Specifications table. This is measured per diode under pulse conditions (PW = 0.3 ms). Since the GBU405-K is a full-wave bridge, total conduction loss is approximately twice this value across the conducting pair. The GBU405-K's V_F remains stable up to 125°C, with typical values increasing to ~1.25 V at elevated junction temperatures.

Is the GBU405-K halogen-free and RoHS compliant?

Yes, the GBU405-K is both RoHS compliant and halogen-free in accordance with IEC 61249-2-21, as explicitly stated in the Features section. The molding compound contains no brominated or chlorinated flame retardants, and lead content meets EU RoHS Directive limits (<1000 ppm). These attributes are verified for the GBU405-K and apply across the GBU404-K–GBU407-K series, supporting compliance in export-controlled and environmentally regulated markets.

What is the junction-to-case thermal resistance (R_θJC) of the GBU405-K?

The GBU405-K has a typical junction-to-case thermal resistance (R_θJC) of 4°C/W, as published in the Thermal Performance table. This value is identical across the GBU404-K–GBU407-K family and reflects thermal conduction from the silicon die to the outer surface of the GBU package. Effective heatsinking - via screw-mounted heatsink or large PCB copper area - is essential to maintain T_J ≤ 150°C under 4A continuous load. The GBU405-K's R_θJC is lower than many competing DIP-4 bridges, enhancing thermal headroom.