Taiwan Semiconductor Corporation KBPF305G

Overview

KBPF305G from Taiwan Semiconductor is a 3A, 600V rated standard quad bridge rectifier in KBPF package, featuring 80A surge capability, 1.1V max forward voltage per diode at 1.5A/25°C, and UL Recognized (E-326243) construction for reliable AC/DC conversion in compact power supplies.

For engineers reviewing the KBPF305G datasheet, KBPF305G pinout, KBPF305G application, or KBPF305G equivalent, key selection factors include its 600V V_RRM, 12°C/W junction-to-lead thermal resistance, RoHS/halogen-free compliance, and compatibility with PCB-mounted 10mm × 10mm copper pads per thermal test conditions.

Technical Context

The KBPF305G integrates four silicon diodes in a single-phase full-wave bridge configuration with common-cathode and common-anode terminals externally accessible. Its 600V repetitive peak reverse voltage and 5µA max reverse leakage at 25°C support stable operation under line-voltage transients in offline rectification.

Thermal performance is defined for PCB mounting: R_θJL = 12°C/W and R_θJA = 59°C/W on a 10mm × 10mm Cu pad. Junction temperature range is –55°C to +150°C, enabling use in industrial ambient environments without forced cooling.

Key Specifications

Pinout & Package

Package: KBPF - Molded plastic case with matte tin-plated leads, UL 94V-0 rated, 1.40g 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 GBU6K and GBU6J, KBPF305G offers superior thermal resistance (12°C/W vs. ~20°C/W typical for GBU), tighter reverse leakage control (5µA vs. 100µA), and smaller KBPF footprint - making it optimal for space-constrained, thermally demanding industrial power supplies.

Availability

KBPF305G is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and LED lighting applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for KBPF305G 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, automotive, and industrial markets since 1979.

The KBPF series was designed specifically for cost-sensitive, high-volume AC/DC front-end rectification in compact power supplies - emphasizing robust surge capability, UL recognition, and PCB-optimized thermal performance.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for KBPF305G?

The KBPF305G has a V_RRM of 600 V, as specified in the Absolute Maximum Ratings table. This value is fixed for the KBPF305G variant and distinguishes it from KBPF304G (400V), KBPF306G (800V), and KBPF307G (1000V). It ensures safe operation under peak line voltages up to 600V in single-phase rectification circuits.

Does KBPF305G require a heatsink in a 3A continuous application?

KBPF305G does not require an external heatsink when mounted on a 10mm × 10mm copper pad per the thermal test condition, as its R_θJL is 12°C/W and R_θJA is 59°C/W. At 3A and 1.1V V_F, power dissipation is ~3.3W; junction temperature rise remains within the 150°C limit under typical ambient conditions, making it suitable for heatsink-free designs in space-constrained adapters.

Is KBPF305G compatible with lead-free reflow soldering processes?

Yes, KBPF305G features matte tin-plated leads compliant with J-STD-002 for solderability and qualified for lead-free reflow profiles. The molded compound meets UL 94V-0 flammability rating, and the device is RoHS and halogen-free per IEC 61249-2-21 - fully supporting modern Pb-free assembly requirements without derating or process modification.

What is the marking code printed on the KBPF305G package?

The KBPF305G is marked "KBPF305G" on the top surface of the KBPF package, followed by a date code (YWW format) and factory code (e.g., "F"). This marking aligns with the ordering code and confirms the 600V rating - distinct from KBPF304G (400V), KBPF306G (800V), and KBPF307G (1000V) variants.

Can KBPF305G replace KBPF304G in an existing design?

KBPF305G can directly replace KBPF304G in most cases because both share identical package (KBPF), pinout, thermal characteristics, and 3A current rating - only V_RRM increases from 400V to 600V. No PCB or layout changes are needed, and the higher voltage rating improves margin against line surges without affecting forward conduction or thermal behavior.