Taiwan Semiconductor Corporation GBU604

Overview

GBU604 from Taiwan Semiconductor is a 6A, 400V repetitive peak reverse voltage (VRRM) standard bridge rectifier in GBU package, featuring 175A surge current capability, 1.1V max forward voltage at 6A/25°C, and <5µA reverse leakage at 25°C - used for AC-DC conversion in compact offline power supplies.

For engineers reviewing the GBU604 datasheet, GBU604 pinout, GBU604 application, or GBU604 equivalent, key selection criteria include VRRM rating, thermal resistance (R_θJC = 2°C/W), junction temperature range (–55°C to +150°C), and AEC-Q101 qualification availability (GBU604H variant).

Technical Context

The GBU604 integrates four silicon diodes in a single-phase full-wave bridge configuration with common-cathode/common-anode topology. Its 400V VRRM rating targets mid-voltage SMPS inputs, while its 21°C/W junction-to-ambient thermal resistance requires heatsinking above ~3.5A continuous conduction.

Electrical behavior is defined by two critical operating points: 1.1V max VF at 6A/25°C and 5µA max IR at rated VR/25°C. Junction capacitance is 211pF per diode at 1MHz/4V, influencing high-frequency switching noise in PFC stages.

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. Dimensions per Taiwan Semiconductor Package Outline Drawing GBU (Rev. N2103).

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 delivers lower forward voltage (1.1V vs. 1.2V/1.15V), tighter reverse leakage (≤5µA), and superior thermal resistance (2°C/W), making it optimal for space-constrained, thermally demanding, or energy-efficient designs.

Availability

GBU604 is available at Aetrix Electronics and suitable for switching mode power supplies, lighting drivers, and industrial AC-DC adapters requiring stable component supply and long-term manufacturability.

Supply support for GBU604 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 and automotive markets since 1979.

The GBU604 belongs to TSC's standard bridge rectifier product line, engineered for high-reliability AC-DC front-end conversion in cost-sensitive, high-volume power supply applications across consumer, industrial, and automotive segments.

FAQ

What is the maximum repetitive peak reverse voltage (VRRM) for GBU604?

The GBU604 has a VRRM rating of 400 V, verified per Taiwan Semiconductor's N2103 datasheet. This value defines the highest instantaneous reverse voltage the device can block repeatedly without breakdown. It is selected to provide adequate margin above 230VAC mains peak voltage (≈325V) and aligns with IEC 61000-3-2 harmonic current emission requirements for Class D equipment using GBU604 in the input stage.

Does GBU604 have AEC-Q101 qualification?

The base GBU604 is not AEC-Q101 qualified; however, the GBU604H variant is explicitly listed as AEC-Q101 qualified in the ordering information section of the datasheet. Engineers requiring automotive-grade reliability must specify GBU604H - it undergoes stress testing per AEC-Q101 Rev D including HTGB, HTRB, and temperature cycling - whereas standard GBU604 is intended for industrial and consumer applications.

What is the thermal resistance from junction to case (R_θJC) for GBU604?

The GBU604 has a junction-to-case thermal resistance (R_θJC) of 2°C/W, measured under standard test conditions per JEDEC JESD51-14. This low value enables efficient heat transfer from the silicon die to the PCB copper pour or external heatsink. When operating at 6A average forward current, this translates to only ~12°C temperature rise across the junction-to-case interface, assuming ideal thermal interface conditions - a key advantage over alternatives with R_θJC ≥3°C/W.

How does the forward voltage (VF) of GBU604 compare at different current levels?

The GBU604 specifies VF ≤1.0 V at IF = 3A and TJ = 25°C, and ≤1.1 V at IF = 6A and TJ = 25°C. These values are measured under pulsed conditions (PW = 0.3ms) to avoid self-heating. At elevated junction temperatures (e.g., 125°C), VF decreases slightly due to negative temperature coefficient of silicon diodes - a behavior confirmed in Figure 4 (Typical Forward Characteristics) of the GBU601–GBU607 datasheet. Designers should use the 1.1V max value for worst-case conduction loss calculation at full load.

Is GBU604 lead-free and RoHS compliant?

Yes, GBU604 is RoHS compliant and halogen-free per IEC 61249-2-21, as stated in the FEATURES section of the official datasheet. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the molding compound is UL 94V-0 rated. No exemptions are applied; all six RoHS-restricted substances are below threshold limits, supporting compliance for CE-marked and WEEE-regulated end products shipped globally.