Taiwan Semiconductor Corporation GBU1003

Overview

GBU1003 from Taiwan Semiconductor is a 10A, 200V repetitive peak reverse voltage (VRRM) standard bridge rectifier in GBU package, featuring 220A surge current capability, 1.1V max forward voltage at 10A/25°C, and <5µA reverse leakage at 25°C - used in AC/DC front-end stages of compact power adapters.

For engineers reviewing the GBU1003 datasheet, GBU1003 pinout, GBU1003 application, or GBU1003 equivalent, key selection criteria include VRRM margin for line-voltage transients, thermal resistance (RθJC = 2°C/W), junction temperature rating (150°C), and AEC-Q101 qualification availability via GBU1003H variant.

Technical Context

The GBU1003 integrates four silicon diodes in a single-phase full-wave bridge configuration with common-cathode and common-anode terminals. Its quad-diode layout enables direct AC input rectification without external interconnects, supporting high-density PCB layouts in space-constrained SMPS designs.

Thermally optimized for conduction-cooled operation, it delivers RθJA = 21°C/W (free-air) and RθJC = 2°C/W, allowing sustained 10A average forward current at case temperatures up to 85°C when mounted on ≥10 cm² copper area - critical for adapter thermal compliance under continuous load.

Key Specifications

Pinout & Package

Package: GBU - molded plastic case with matte tin-plated leads, UL 94V-0 rated, 4.0g 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 GBU1003, GBU1004 offers higher voltage robustness without trade-offs in current or thermal performance, while KBU1003 provides second-source availability at the cost of 0.05V higher VF and 4°C/W worse RθJA - impacting efficiency and thermal design in compact adapters.

Availability

GBU1003 is available at Aetrix Electronics and suitable for switching mode power supplies, lighting drivers, and USB-C adapters requiring stable component supply across industrial and consumer production cycles.

Supply support for GBU1003 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 GBU series targets cost-sensitive, high-volume AC/DC conversion applications - emphasizing reliability, thermal efficiency, and regulatory compliance (UL, RoHS, halogen-free) for consumer, industrial, and automotive auxiliary power systems.

FAQ

What is the maximum repetitive peak reverse voltage (VRRM) rating for GBU1003?

The GBU1003 has a VRRM rating of 200 V, verified per Taiwan Semiconductor's M2103 datasheet. This value defines the highest instantaneous reverse voltage the device can block repeatedly without breakdown. It is selected specifically for universal-input (90–264VAC) and 230VAC-only power supplies where 200V provides adequate margin over peak line voltage (≈325V) after accounting for derating and transients. The GBU1003 must not be substituted with lower-VRRM variants like GBU1002 (100V) in such applications.

Does GBU1003 support automotive applications?

Yes - the GBU1003H variant is AEC-Q101 qualified and approved for automotive use, including interior lighting and body control modules. Standard GBU1003 (non-H suffix) is not AEC-Q101 certified. The qualification covers stress testing for temperature cycling, humidity, mechanical shock, and high-temperature reverse bias. For automotive designs, only GBU1003H should be specified; its electrical parameters (VRRM, IF, VF) match the base GBU1003, ensuring drop-in compatibility where qualification is required.

What is the thermal resistance from junction to case (RθJC) for GBU1003?

The GBU1003 has a junction-to-case thermal resistance (RθJC) 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 an external heatsink or PCB copper plane. In practice, mounting the GBU1003 with thermal epoxy or solder to a 25mm × 25mm 2oz copper pad reduces total thermal resistance significantly - critical for maintaining TJ ≤150°C at 10A continuous load in enclosed adapters.

How does the forward voltage (VF) of GBU1003 affect power loss?

At 10A and 25°C, the GBU1003 exhibits a maximum forward voltage of 1.1 V per diode path, resulting in ~2.2 V total drop across the bridge. This yields conduction loss of P = IF × VF × 2 = 10A × 1.1V × 2 = 22 W worst-case - though actual loss is lower due to duty-cycle averaging and temperature effects. Lower VF directly improves efficiency and reduces heatsink requirements; the GBU1003's 1.1V spec positions it between standard and ultra-low VF bridges, balancing cost and thermal performance.

Is GBU1003 RoHS and halogen-free compliant?

Yes - the GBU1003 complies with RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. Taiwan Semiconductor confirms this in the M2103 datasheet, noting that the molding compound contains no brominated or chlorinated flame retardants. This compliance supports export to EU, China, and other regulated markets and aligns with sustainability goals in consumer electronics and industrial equipment manufacturing. The "G" marking on the device denotes green compound usage.