Taiwan Semiconductor Corporation GBU801

Overview

GBU801 from Taiwan Semiconductor is a 8A, 50V repetitive peak reverse voltage (VRRM) standard bridge rectifier in GBU package, featuring quad diode configuration, 200A surge capability, and 1500VRMS dielectric strength - used in AC/DC front-end stages of compact switching power supplies.

For engineers reviewing the GBU801 datasheet, GBU801 pinout, GBU801 application, or GBU801 equivalent, key selection criteria include VRRM rating, IFSM margin for inrush handling, thermal resistance (RθJA = 21°C/W), junction temperature range (–55°C to +150°C), and AEC-Q101 qualification availability.

Technical Context

The GBU801 integrates four silicon diodes in a single-phase full-wave bridge configuration with common-cathode and common-anode terminals externally accessible. Its 50V VRRM rating targets low-voltage AC input applications such as 12V/24V SMPS and LED drivers where reverse voltage stress remains constrained.

Thermal performance is defined by RθJC = 2°C/W and RθJA = 21°C/W, enabling 8A continuous forward current at case temperatures ≤75°C without forced airflow. Reverse leakage stays ≤5µA at 25°C and ≤500µA at 125°C under rated VR.

Key Specifications

Pinout & Package

Package: GBU - molded plastic case with matte tin-plated leads, UL 94V-0 rated, 4.0g weight, polarity marked on body.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU8K and KBU8A, the GBU801 offers superior thermal resistance in the same footprint, tighter reverse leakage, and optional AEC-Q101 qualification - making it preferred for high-density, thermally demanding, or automotive-adjacent applications.

Availability

GBU801 is available at Aetrix Electronics and suitable for switching mode power supplies, LED lighting drivers, and industrial control power modules requiring stable component supply across production lifecycles.

Supply support for GBU801 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 consumer markets since 1979.

The GBU series was designed specifically for high-reliability, high-surge AC/DC front-end rectification in compact power supplies - balancing thermal performance, safety certification, and manufacturability in automated SMT lines.

FAQ

What is the maximum continuous forward current rating for GBU801?

The GBU801 has a rated average forward current (IF) of 8 A at TA = 25°C with adequate heatsinking. Derating is required above 25°C ambient; at 75°C case temperature, the usable IF drops to approximately 5.5 A per the forward current derating curve in the datasheet. The GBU801 must be mounted on ≥1.5 cm² copper area to sustain full 8A operation without forced cooling.

Does GBU801 meet automotive reliability standards?

The standard GBU801 is not AEC-Q101 qualified, but the GBU801H variant - identifiable by the "H" suffix in the ordering code - is fully AEC-Q101 qualified for automotive applications. This version undergoes extended temperature cycling, humidity testing, and surge validation per the AEC specification. Always verify the part marking or packaging label to confirm H-suffix compliance before use in automotive systems.

What is the reverse leakage current specification for GBU801 at elevated temperature?

At TJ = 125°C and rated reverse voltage (50V), the GBU801 exhibits a maximum reverse current (IR) of 500 µA per diode, as specified in the Electrical Specifications table. This value is critical for standby power budgeting in energy-efficient lighting and IoT devices. At room temperature (25°C), IR is guaranteed ≤5 µA, supporting ultra-low-loss operation in always-on applications.

Can GBU801 be used as a direct replacement for GBU802 in a 100V design?

No - the GBU801 is rated for 50V VRRM only, while the GBU802 supports 100V. Substituting GBU801 into a circuit designed for 100V reverse stress risks premature breakdown and catastrophic failure during voltage transients or peak AC cycles. Always match the VRRM rating to the maximum expected reverse voltage in the application; GBU801 is strictly intended for ≤50V reverse applications.

What is the junction-to-case thermal resistance (RθJC) of GBU801, and how does it impact heatsink design?

The GBU801 has a junction-to-case thermal resistance (RθJC) of 2°C/W, indicating efficient internal heat transfer from die to package base. This allows effective thermal coupling to external heatsinks or PCB copper. When combined with its 21°C/W RθJA, the low RθJC enables higher power density - for example, dissipating 2.2W (8A × 1.1V × 2 diodes) raises junction temperature only ~4.4°C above case temperature, simplifying thermal management in space-limited designs.