Taiwan Semiconductor Corporation GBU404

Overview

GBU404 from Taiwan Semiconductor is a 4A, 400V repetitive peak reverse voltage (V_RRM) standard bridge rectifier in GBU package, featuring 150A surge current (8.3ms), 1.1V max forward voltage at 4A, and 100pF junction capacitance at 1MHz/4.0V reverse bias - used in AC-DC front-end stages of compact switching power supplies.

For engineers reviewing the GBU404 datasheet, GBU404 pinout, GBU404 application, or GBU404 equivalent, key selection criteria include V_RRM = 400V, I_F = 4A, thermal resistance R_θJC = 4°C/W, junction temperature range –55°C to +150°C, and UL recognition under file #E-326243.

Technical Context

The GBU404 integrates four silicon diodes in a single-phase full-wave bridge configuration with common-cathode and common-anode terminals. It operates across –55°C to +150°C junction temperature and supports 8.3ms non-repetitive surge currents up to 150A at 25°C ambient.

Its electrical behavior is defined by 1.1V max forward voltage at rated 4A DC load, 5µA max reverse leakage at 25°C, and 100pF junction capacitance measured at 1MHz with 4.0V reverse bias - parameters critical for EMI filtering and high-frequency rectification stability.

Key Specifications

Pinout & Package

Package: GBU - molded plastic case with matte tin-plated leads, UL 94V-0 rated, 4.00g 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 GBU4K and KBU4M, the GBU404 delivers superior thermal efficiency (R_θJC = 4°C/W), higher surge robustness (150A), and UL safety recognition - making it preferred for compact, certified, and high-reliability AC-DC conversion.

Availability

GBU404 is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and LED lighting drivers requiring stable component supply with consistent parametric performance and long-term manufacturability.

Supply support for GBU404 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 industrial, computing, and consumer markets since 1979.

The GBU401–GBU407 series was designed specifically for cost-effective, high-reliability AC-DC front-end rectification in space- and thermally-constrained applications - emphasizing surge resilience, safety certification, and RoHS/halogen-free compliance.

FAQ

What is the peak repetitive reverse voltage rating of the GBU404?

The GBU404 has a repetitive peak reverse voltage (V_RRM) rating of 400V. This value is confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version M2103), where GBU404 is explicitly assigned 400V under the V_RRM column. It defines the maximum AC voltage the device can block during normal operation without avalanche breakdown.

Does the GBU404 have UL recognition, and what is the file number?

Yes, the GBU404 is UL Recognized under file number E-326243. This is stated in the FEATURES section of the Taiwan Semiconductor datasheet and applies to the entire GBU401–GBU407 family, including GBU404. UL recognition validates its suitability for end-product safety certification in accordance with standards such as UL 62368-1.

What is the junction capacitance of the GBU404, and under what test conditions is it specified?

The junction capacitance (C_J) of the GBU404 is 100pF, measured at 1MHz with 4.0V reverse bias applied per diode. This value is explicitly listed in the ELECTRICAL SPECIFICATIONS table under "GBU404 1MHz, VR = 4.0V" and is critical for high-frequency noise analysis and snubber design in modern SMPS.

Is the GBU404 suitable for automotive applications?

The base GBU404 is not AEC-Q101 qualified, but the GBU404H variant is. The datasheet states "AEC-Q101 qualified available" for the GBU401–GBU407 family, and ordering code GBU404H denotes the qualified version. For automotive body electronics or infotainment power supplies requiring qualification, GBU404H must be specified - the standard GBU404 lacks the required stress-test validation.

What is the thermal resistance from junction to case (R_θJC) for the GBU404, and how does it impact heatsinking?

The GBU404 has a junction-to-case thermal resistance (R_θJC) of 4°C/W, as specified in the THERMAL PERFORMANCE section. This low value allows direct mounting to an external heatsink via the case, enabling efficient heat extraction - essential for maintaining T_J ≤150°C in continuous 4A operation without oversized PCB copper areas.