Taiwan Semiconductor Corporation KBU602G

Overview

KBU602G from Taiwan Semiconductor is a 6A, 100V repetitive peak reverse voltage (V_RRM) glass-passivated standard bridge rectifier in KBU package, featuring 175A surge current capability, 1.1V max forward voltage at 6A, and <5µA reverse leakage at 25°C - used in AC/DC front-end stages of compact switch-mode power supplies.

For engineers reviewing the KBU602G datasheet, KBU602G pinout, KBU602G application, or KBU602G equivalent, key selection criteria include V_RRM margin for line-voltage transients, thermal resistance (R_θJA = 8.6°C/W), I_FSM rating for inrush handling, and RoHS-compliant matte tin-plated leads for reliable PCB soldering.

Technical Context

The KBU602G 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 across temperature and long-term reliability under repeated surge stress.

Thermally, it uses a molded KBU case rated UL 94V-0 with R_θJC = 3.1°C/W to the case and R_θJA = 8.6°C/W to ambient - requiring minimal heatsinking for continuous 6A operation at ≤70°C ambient when mounted on ≥1-in² copper area.

Key Specifications

Pinout & Package

Package: KBU - molded plastic case with 4 axial leads (AC1, AC2, +, –), UL 94V-0 rated, matte tin-plated per J-STD-002, 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 GBU6K and W04G, the KBU602G offers optimal balance of 100 V_RRM margin, 6 A continuous rating, and 8.6°C/W thermal performance in a compact KBU outline - making it preferred for cost-sensitive, volume SMPS designs where board space and thermal efficiency are jointly constrained.

Availability

KBU602G is available at Aetrix Electronics and suitable for switching mode power supplies, USB wall adapters, and LED lighting drivers requiring stable component supply, consistent lead finish, and UL-recognized safety compliance.

Supply support for KBU602G 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, industrial, and consumer markets since 1979.

The KBU602G belongs to TSC's standard bridge rectifier product line, engineered for high-reliability AC/DC conversion in cost-sensitive, high-volume power supplies where thermal robustness, safety certification, and long-term parametric stability are mandatory.

FAQ

What is the maximum ambient temperature for continuous 6 A operation of the KBU602G?

The KBU602G supports 6 A continuous forward current at 25°C ambient with no heatsink. For higher ambient temperatures, derating is required using the forward current derating curve. At 70°C ambient, the usable I_F drops to ~4.2 A with standard PCB copper; forced air or heatsinking restores full 6 A capability. Always verify junction temperature stays ≤150°C using R_θJA = 8.6°C/W in your layout.

Does the KBU602G have a specified I²t rating for fuse coordination?

Yes, the KBU602G has a rated I²t value of 127 A²s for t < 8.3 ms, as defined in its absolute maximum ratings table. This value is used to coordinate upstream fusing and ensure the device survives short-duration line surges without catastrophic failure. It applies identically across the KBU601G–KBU607G family, including the KBU602G.

Is the KBU602G compatible with lead-free reflow soldering processes?

Yes, the KBU602G features matte tin-plated leads qualified per J-STD-002 for solderability, and its KBU package is rated for peak reflow temperatures up to 260°C. The molding compound meets UL 94V-0, ensuring no delamination or cracking during standard lead-free reflow profiles. No special prebake is required prior to assembly.

How does the KBU602G's reverse leakage compare to other 100 V bridge rectifiers?

The KBU602G specifies maximum reverse current I_R = 5 µA at 25°C and 100 V, which is competitive with industry-standard bridges like GBU6K and W04G. At 125°C, its I_R remains ≤500 µA - a result of glass passivation that outperforms epoxy-passivated alternatives where leakage may exceed 1 mA at elevated temperature.

Can the KBU602G be used in a 230 VAC input design?

No - the KBU602G has V_RRM = 100 V, insufficient for 230 VAC systems whose peak voltage exceeds 325 V. For 230 VAC, select KBU604G (400 V) or higher. Using KBU602G in such designs risks immediate avalanche breakdown and permanent failure. Always match V_RRM to ≥1.4 × maximum expected input peak voltage.