Taiwan Semiconductor Corporation KBU1005G

Overview

KBU1005G from Taiwan Semiconductor is a 10A, 600V repetitive peak reverse voltage (VRRM) standard bridge rectifier in KBU package, featuring glass-passivated junctions, 200A surge capability (IFSM), and UL Recognized File # E-326243 compliance; it serves as the AC-to-DC front-end in compact offline power supplies.

For engineers reviewing the KBU1005G datasheet, KBU1005G pinout, KBU1005G application, or KBU1005G equivalent, key selection criteria include VRRM=600V, IF=10A, TJ(max)=150°C, RθJC=2.2°C/W, and matte tin-plated leads compliant with J-STD-002 solderability.

Technical Context

The KBU1005G integrates four silicon diodes in a single-phase full-wave bridge configuration with quad-terminal layout, enabling direct AC input rectification without external interconnects. Its glass-passivated junction ensures stable leakage performance (IR ≤ 5 µA at 25°C, ≤ 500 µA at 125°C) and high reliability under thermal cycling.

Thermally, it delivers RθJA = 25°C/W (free-air) and RθJC = 2.2°C/W, supporting conduction-cooled mounting on PCBs with minimal heatsinking. The device operates across –55°C to +150°C junction temperature range and meets UL 94V-0 flammability and JESD201 Class 1A whisker resistance requirements.

Key Specifications

Pinout & Package

Package: KBU - Molded plastic case with 4 axial leads (AC1, AC2, +, –), UL 94V-0 rated, 7.2 g 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 GBU1006 and W10M, the KBU1005G offers optimal balance of 600V rating, compact KBU footprint, 200A surge headroom, and UL recognition-making it preferred for certified, volume-sensitive AC-DC power supplies.

Availability

KBU1005G is available at Aetrix Electronics and suitable for switching mode power supplies, USB-C adapters, and LED lighting applications requiring stable component supply, consistent parametric performance, and full traceability.

Supply support for KBU1005G 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 KBU series is part of TSC's standard rectifier product line, engineered specifically for high-reliability, cost-optimized AC-DC conversion in consumer, industrial, and lighting power supplies.

FAQ

What is the maximum repetitive peak reverse voltage (VRRM) rating for KBU1005G?

The KBU1005G has a VRRM rating of 600 V, verified per Taiwan Semiconductor's official datasheet revision J2103. This value defines the highest instantaneous reverse voltage the device can block repeatedly without breakdown. It is selected to provide safe margin over 265 VAC mains inputs (≈375 V peak) and transient spikes in off-line power applications. The KBU1005G is distinct from KBU1004G (400 V) and KBU1006G (800 V) in this parameter.

Does KBU1005G meet RoHS and UL safety requirements?

Yes, the KBU1005G is RoHS compliant and UL Recognized under File # E-326243, as confirmed in the official Taiwan Semiconductor datasheet. The UL recognition covers dielectric strength, flammability (UL 94V-0), and construction integrity. RoHS compliance ensures lead-free matte tin plating and absence of restricted substances. These certifications apply directly to the KBU1005G variant-not inferred from family-level statements.

What is the forward voltage drop (VF) of KBU1005G at full rated current?

The KBU1005G exhibits a maximum forward voltage drop of 1.1 V per diode at IF = 10 A and TJ = 25°C, per the Electrical Specifications table in the datasheet. Since the bridge contains two diodes conducting in series per half-cycle, total conduction loss is based on 2.2 V drop at 10 A. This VF value is measured under pulsed conditions (PW = 0.3 ms) and is critical for calculating conduction losses in high-efficiency SMPS designs.

Can KBU1005G be used in place of KBU1004G or KBU1006G without circuit changes?

No-KBU1005G is not a drop-in replacement for KBU1004G (400 V VRRM) or KBU1006G (800 V VRRM), as VRRM is a fixed, non-adjustable parameter tied to internal die design. While pinout and package are identical across the KBU100xG series, substituting across voltage grades requires verification of reverse stress margins in the target application. The marking "KBU1005G" explicitly denotes the 600 V version.

What thermal resistance values are specified for KBU1005G?

The KBU1005G specifies RθJC = 2.2°C/W (junction-to-case) and RθJA = 25°C/W (junction-to-ambient, free-air). These values are measured per JEDEC standards and enable accurate thermal modeling: RθJC supports heatsink interface design, while RθJA guides natural-convection layout rules. Both values are identical across the KBU1001G–KBU1007G family and validated in the Thermal Performance section of the datasheet.