Taiwan Semiconductor Corporation KBU605G

Overview

KBU605G from Taiwan Semiconductor is a 6A, 600V repetitive peak reverse voltage (V_RRM) standard bridge rectifier in KBU package, featuring glass-passivated junctions, 175A surge capability, and UL Recognized File #E-326243. It serves as the AC-to-DC conversion stage in compact off-line power supplies for consumer adapters and LED drivers.

For engineers reviewing the KBU605G datasheet, KBU605G pinout, KBU605G application, or KBU605G equivalent, key selection criteria include verified V_RRM = 600V, I_F = 6A continuous rating, thermal resistance R_θJC = 3.1°C/W, and compliance with JESD201 Class 1A whisker testing for high-reliability PCB assembly.

Technical Context

The KBU605G integrates four silicon diodes in a single-phase full-wave bridge configuration with quad internal layout. Its glass-passivated junction ensures stable reverse leakage (<5 µA at 25°C) and robustness against humidity and contamination during reflow soldering.

Designed for conduction-mode operation in 50/60 Hz and high-frequency SMPS inputs, it supports 8.3 ms half-sine surge currents up to 175A and maintains junction temperature within –55°C to +150°C across ambient conditions, enabled by low R_θJC = 3.1°C/W and UL 94V-0 molding compound.

Key Specifications

Pinout & Package

Package: KBU - Molded plastic case with matte tin-plated leads, UL 94V-0 rated, weight ≈ 7.20 g, mounting torque ≤ 0.56 N·m.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU6K and W04M, the KBU605G delivers precise 600 V reverse capability with industry-standard 6 A/175 A ratings and UL recognition-making it the preferred choice for mid-power SMPS where V_RRM margin, thermal headroom, and safety certification are jointly critical.

Availability

KBU605G is available at Aetrix Electronics and suitable for switching mode power supplies, LED lighting drivers, and USB-C wall adapters requiring stable component supply, consistent parametric performance, and traceable RoHS-compliant sourcing.

Supply support for KBU605G 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, specializing in rectifiers, TVS diodes, MOSFETs, and power ICs since 1979.

The KBU605G belongs to TSC's standard bridge rectifier product line, engineered for high-volume, cost-sensitive AC/DC front-ends in consumer, industrial, and lighting applications where reliability, safety certification, and thermal efficiency are prioritized.

FAQ

What is the maximum junction temperature rating for KBU605G?

The KBU605G has a maximum junction temperature (T_J) rating of +150°C, validated across its full operating range from –55°C to +150°C. This allows reliable operation in sealed enclosures or high-ambient environments such as LED luminaires and industrial control panels. The KBU605G's R_θJC = 3.1°C/W enables effective heat transfer to external heatsinks or metal chassis when ambient temperatures approach 70°C.

Does KBU605G meet RoHS and lead-free soldering requirements?

Yes, the KBU605G is RoHS compliant and features matte tin-plated leads qualified per J-STD-002 for both lead-free and SnPb soldering processes. Its molding compound meets UL 94V-0 flammability standards, and the device passes JESD201 Class 1A whisker testing-ensuring long-term reliability in automated assembly lines and field-deployed equipment using KBU605G.

What is the forward voltage drop of KBU605G at full rated current?

At I_F = 6 A and T_J = 25°C, the KBU605G exhibits a maximum forward voltage drop (V_F) of 1.1 V per diode. This value defines conduction losses in the bridge and directly impacts thermal design-e.g., total dissipation at 6 A is approximately 2.64 W (4 × 0.66 V avg). The KBU605G's V_F remains stable across temperature due to its glass-passivated junction structure.

How does KBU605G compare to KBU604G and KBU606G in voltage rating?

The KBU605G is rated for 600 V repetitive peak reverse voltage (V_RRM), positioned between KBU604G (400 V) and KBU606G (800 V) in the KBU6xG family. All share identical I_F = 6 A, I_FSM = 175 A, and KBU package. Select KBU605G specifically when system-level surge testing or regional mains voltage (e.g., 230 V_AC + 30% tolerance) demands 600 V margin-not 400 V or 800 V.

Is KBU605G UL Recognized, and what is its file number?

Yes, the KBU605G is UL Recognized under File #E-326243, confirming compliance with UL/CSA 60747-1 and related safety standards for discrete semiconductors. This recognition applies to the entire KBU601G–KBU607G series and validates dielectric strength, flammability (UL 94V-0), and construction integrity-critical for end-product safety certification of power supplies using KBU605G.