Taiwan Semiconductor Corporation KBU1003G T0G

Overview

KBU1003G from Taiwan Semiconductor is a 10A, 200V repetitive peak reverse voltage (VRRM) glass-passivated single-phase bridge rectifier in KBU package, featuring 200A surge 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 industrial adapters and lighting ballasts.

For engineers reviewing the KBU1003G datasheet, KBU1003G pinout, KBU1003G application, or KBU1003G equivalent, key selection criteria include VRRM rating, thermal resistance (R_θJC = 2.2°C/W), I²t fusing rating (166 A²s), junction temperature range (–55°C to +150°C), and UL recognition (E-326243).

Technical Context

The KBU1003G integrates four silicon diodes in a single-phase full-wave bridge configuration with quad internal layout, enabling direct AC-to-DC conversion without external interconnects. Its glass-passivated junction ensures stable reverse characteristics and low IR drift over temperature.

Thermally optimized for PCB mounting, it delivers R_θJA = 25°C/W (free air) and supports continuous 10A conduction with derating above 50°C ambient. The device meets JESD201 Class 1A whisker resistance and UL 94V-0 flammability requirements for safety-critical power supplies.

Key Specifications

Pinout & Package

Package: KBU - molded plastic case with matte tin-plated leads, UL 94V-0 rated, 7.2 g weight, designed for through-hole PCB mounting with 0.56 N·m max torque.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU10K-E3/51 and W04M, the KBU1003G offers superior thermal performance (R_θJC = 2.2°C/W) and highest surge robustness (200 A), making it preferred for industrial-grade power supplies requiring long-term reliability under transient stress.

Availability

KBU1003G is available at Aetrix Electronics and suitable for industrial adapters, LED driver power supplies, and switching mode power supplies requiring stable component supply, consistent parametric performance, and UL-recognized safety compliance.

Supply support for KBU1003G 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 KBU1003G belongs to TSC's standard bridge rectifier product line, engineered for high-reliability AC/DC conversion in cost-sensitive yet thermally demanding applications such as lighting, adapters, and open-frame power supplies.

FAQ

What is the maximum repetitive peak reverse voltage (VRRM) rating for the KBU1003G?

The KBU1003G has a VRRM rating of 200 V, meaning it can reliably block up to 200 V of reverse voltage across its AC terminals without breakdown. This corresponds to an input AC RMS voltage of approximately 141 V, making the KBU1003G suitable for universal-input (100–240 V_AC) power supplies operating within safe derating margins. The rating is confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version J2103).

Does the KBU1003G require a heatsink for 10 A continuous operation?

The KBU1003G can operate at 10 A continuous current without an external heatsink only under ideal free-air conditions and ambient temperatures ≤40°C, per its R_θJA = 25°C/W rating. At higher ambient temperatures or with PCB-only thermal dissipation, a heatsink or substantial copper pour is recommended. For sustained 10 A loads above 50°C ambient, thermal design must account for R_θJC = 2.2°C/W to maintain T_J ≤150°C - verified in the Thermal Performance section of the KBU1003G datasheet.

Is the KBU1003G RoHS compliant and lead-free solder compatible?

Yes, the KBU1003G is RoHS compliant and features matte tin-plated leads qualified per J-STD-002 for lead-free soldering. It also passes JESD201 Class 1A whisker testing, ensuring long-term reliability in Pb-free reflow processes. These qualifications are explicitly stated in the Mechanical Data section of the Taiwan Semiconductor KBU1001G–KBU1007G datasheet (Version J2103), confirming suitability for modern eco-compliant manufacturing.

What is the marking code printed on the KBU1003G device body?

The KBU1003G is marked "KBU1003G" on its top surface, followed by date code (YWW format) and factory code (e.g., "F"). This marking aligns with the Ordering Information table in the official datasheet, where "x" in "KBU10xG" denotes the voltage grade - "3" corresponds to 200 V VRRM. No alternate or abbreviated markings are specified for this variant.

How does the KBU1003G compare to the KBU1004G in terms of electrical ratings?

The KBU1003G and KBU1004G share identical IF = 10 A, IFSM = 200 A, and thermal specifications, differing only in VRRM: KBU1003G is rated for 200 V, while KBU1004G is rated for 400 V. Their forward voltage (VF ≤1.1 V @10A) and reverse current (IR ≤5 µA @25°C) are identical. Therefore, KBU1003G is appropriate for 141 V_RMS max inputs, whereas KBU1004G supports up to 283 V_RMS - selection depends strictly on system AC input range requirements.