Taiwan Semiconductor Corporation GBU603

Overview

GBU603 from Taiwan Semiconductor is a 6A, 200V repetitive peak reverse voltage (VRRM) standard bridge rectifier in GBU package, featuring 175A surge current capability, 1.1V max forward voltage at 6A, and <5µA reverse leakage at 25°C - used in AC/DC front-end stages of compact switching mode power supplies.

For engineers reviewing the GBU603 datasheet, GBU603 pinout, GBU603 application, or GBU603 equivalent, key selection criteria include VRRM rating for input voltage derating, thermal resistance (R_θJC = 2°C/W), junction temperature range (–55°C to +150°C), and AEC-Q101 qualification availability for automotive-grade reliability validation.

Technical Context

The GBU603 integrates four silicon diodes in a single-phase full-wave bridge configuration with common-cathode and common-anode terminals, enabling direct AC-to-DC conversion without external wiring. Its quad-diode layout supports PCB-mounting with minimal footprint and high dielectric strength (1500V_RMS) between case and terminals.

Thermally optimized for conduction-limited operation, it delivers 6A average forward current with junction-to-case thermal resistance of 2°C/W and junction-to-ambient of 21°C/W - requiring heatsinking only above ~3.5A continuous load at ambient >50°C.

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. 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 GBU603, GBU6K offers comparable voltage/current ratings but trades off 0.5°C/W higher thermal resistance and doubled leakage, while GBPC602 uses a physically incompatible package - making GBU603 optimal for new compact, thermally demanding, or automotive-qualified bridge rectifier implementations.

Availability

GBU603 is available at Aetrix Electronics and suitable for switching mode power supplies, LED lighting drivers, and automotive auxiliary power modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for GBU603 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 industrial, computing, and automotive markets since 1979.

The GBU603 belongs to TSC's standard bridge rectifier product line, engineered for high-reliability AC/DC conversion in cost-sensitive, thermally constrained power supplies - emphasizing robust surge handling, low leakage, and regulatory compliance.

FAQ

What is the maximum repetitive peak reverse voltage (VRRM) rating for GBU603?

The GBU603 has a VRRM rating of 200 V, meaning it can safely block up to 200 V of reverse voltage in repetitive AC cycles. This value is fixed per the device marking and datasheet - GBU603 is distinct from GBU601 (50 V) and GBU604 (400 V). Designers must ensure input voltage peaks remain below this rating with appropriate safety margin, especially in universal-input (85–265 V_RMS) applications where peak voltage reaches ~375 V.

Does GBU603 support automotive-grade reliability requirements?

Yes - the GBU603H variant is AEC-Q101 qualified, meeting stress-test requirements for automotive power electronics. Standard GBU603 is not AEC-Q101 certified; only the "H" suffix version undergoes temperature cycling, humidity bias, and high-temperature reverse bias testing. For automotive applications such as body control modules or infotainment power supplies, specify GBU603H to ensure qualification compliance and long-term field reliability.

What is the forward voltage drop of GBU603 at rated current?

The GBU603 exhibits a maximum forward voltage drop of 1.1 V per conducting diode pair at 6 A and 25°C junction temperature. Since full-wave rectification passes current through two series diodes, the total VF across the bridge is ≤2.2 V. This value increases with temperature and current - at 125°C and 6 A, typical VF rises to ~1.3 V per diode, resulting in ~2.6 V total drop and higher conduction losses.

How does the thermal resistance of GBU603 impact heatsink design?

With R_θJC = 2°C/W and R_θJA = 21°C/W, the GBU603 requires careful thermal management above ~3.5 A continuous current. For example, at 6 A and 25°C ambient, junction temperature rises by ~12°C above case temperature - so a 10°C/W heatsink keeps T_J at ~107°C. The GBU603's low R_θJC enables efficient heat transfer to an external heatsink via its metal tab, unlike plastic-only packages with higher thermal resistance.

Is GBU603 pin-compatible with other GBU-series rectifiers like GBU602 or GBU604?

Yes - all GBU6xx devices (GBU601 through GBU607) share identical GBU package dimensions, pinout, and terminal configuration (AC1, AC2, +, –). Only VRRM, VR(RMS), and junction capacitance differ across the series. This allows design reuse across voltage grades: replacing GBU603 with GBU604 (400 V) requires no PCB changes, provided layout accommodates higher voltage clearance and thermal profile remains acceptable.