Taiwan Semiconductor Corporation KBU407G

Overview

KBU407G from Taiwan Semiconductor is a 4A, 1000V repetitive peak reverse voltage (V_RRM) standard quad-bridge rectifier in KBU package, featuring glass-passivated junctions, <1.1V forward voltage at 4A/25°C, and 150A surge capability - used in high-voltage AC/DC front-end stages of industrial power supplies and lighting ballasts.

For engineers reviewing the KBU407G datasheet, KBU407G pinout, KBU407G application, or KBU407G equivalent, key selection criteria include verified V_RRM = 1000V, I_F = 4A continuous rating, thermal resistance R_θJC = 4°C/W, UL recognition E-326243, and RoHS compliance for safety-critical mains-input rectification.

Technical Context

The KBU407G integrates four silicon diodes in a single-phase bridge configuration with common-cathode/common-anode topology, optimized for line-frequency and high-frequency switching applications up to 60 kHz. Its glass-passivated junction ensures stable leakage current (<5 µA at 25°C) and robustness against humidity and contamination.

Thermally, it supports operation from –55°C to +150°C junction temperature, with R_θJA = 19°C/W (free-air) and R_θJC = 4°C/W, enabling direct PCB mounting without heatsink for ≤2.5W dissipation at rated load. The KBU package uses matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 1A whisker resistance.

Key Specifications

Pinout & Package

Package: KBU - molded plastic case with 4 axial leads (AC1, AC2, +, –), UL 94V-0 rated, 7.2 g weight, 0.56 N·m max mounting torque.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU4K and W04M, the KBU407G uniquely delivers 1000V reverse blocking with 150A surge tolerance in a UL-recognized, industrial-grade KBU package - making it the only option among the three qualified for 277VAC+ lighting and heavy-duty power supply designs requiring safety certification and long-term reliability.

Availability

KBU407G is available at Aetrix Electronics and suitable for industrial power supplies, LED lighting drivers, and AC/DC adapters requiring stable component supply, long-lifecycle support, and UL-recognized rectification performance.

Supply support for KBU407G 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 KBU401G–KBU407G series was designed specifically for high-reliability, high-voltage AC/DC front-end rectification - emphasizing UL recognition, thermal robustness, and long-term parametric stability in mains-connected equipment.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) rating for KBU407G?

The KBU407G has a V_RRM rating of 1000 V, confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version J2103). This value is specific to KBU407G and distinguishes it from lower-voltage variants like KBU406G (800 V) and KBU405G (600 V). It ensures safe operation in 277VAC and 400VAC three-phase systems with regulatory surge margins.

Is KBU407G UL recognized, and what is its file number?

Yes, the KBU407G is UL Recognized under file number E-326243, as stated in the FEATURES section of the Taiwan Semiconductor datasheet. This certification covers dielectric strength, flammability (UL 94V-0), and construction integrity - essential for achieving end-product safety approvals in North American markets.

What is the forward voltage (V_F) of KBU407G at rated current?

The KBU407G exhibits a maximum forward voltage of 1.1 V at 4 A and 25°C junction temperature, per the Electrical Specifications table. This value is measured across the entire bridge (two diodes conducting), and directly determines conduction losses in high-current rectifier applications.

Does KBU407G have a specified thermal resistance, and what are the values?

Yes, the KBU407G specifies R_θJC = 4°C/W (junction-to-case) and R_θJA = 19°C/W (junction-to-ambient, free-air). These values are published in the Thermal Performance section and enable accurate thermal modeling when mounted to heatsinks or metal-core PCBs - critical for maintaining T_J ≤ 150°C under full load.

What packaging and marking format does KBU407G use?

KBU407G is supplied in KBU package with matte tin-plated leads and marked "KBU407G" followed by date code (YWW) and factory code (F), as shown in the Marking Diagram on page 4 of the datasheet. It ships in trays of 100 units, per the Ordering Information table.