Diodes Incorporated SBR40U120CT-G

Overview

SBR40U120CT-G from Diodes Incorporated is a 40A dual common-cathode super barrier rectifier with 120V peak reverse voltage, ultra-low 0.71V forward voltage at 20A/125°C, soft fast switching, and 150°C junction rating-used in high-efficiency AC-DC front-end rectification for industrial power supplies.

For engineers reviewing the SBR40U120CT-G datasheet, SBR40U120CT-G pinout, SBR40U120CT-G application, or SBR40U120CT-G equivalent, key selection criteria include per-leg forward voltage at elevated temperature, thermal resistance (RθJC = 2.0°C/W), surge current rating (IFSM = 300A), leakage behavior at 125°C, and TO-220AB mechanical compatibility with heatsink mounting.

Technical Context

This dual-diode rectifier integrates two independent SBR (Super Barrier Rectifier) elements in a single TO-220AB package with common cathode configuration, enabling synchronous half-wave or center-tapped full-wave topologies. Its patented barrier structure delivers lower VF than Schottky diodes while maintaining higher VRRM and superior high-temperature leakage stability.

The device operates up to 150°C junction temperature with 2.0°C/W typical thermal resistance from junction to case when mounted on a specified heatsink. It exhibits soft recovery characteristics critical for reducing EMI in high-frequency switching converters, and supports 300A non-repetitive surge current under 8.3ms half-sine conditions.

Key Specifications

Pinout & Package

Package: TO-220AB, 3-terminal plastic molded case with isolated tab (cathode-connected tab), UL 94V-0 rated, matte tin-plated copper leadframe, 1.85g weight.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current super barrier rectifier applications.

Compared with VS-40CPH12 and MUR40120CT, SBR40U120CT-G delivers the lowest high-temperature VF and softest switching among TO-220AB dual rectifiers, making it optimal for thermally constrained, high-frequency, high-efficiency power conversion where conduction loss and EMI co-design are critical.

Availability

SBR40U120CT-G is available at Aetrix Electronics and suitable for industrial power supplies, telecom rectifier boards, and solar microinverter designs requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.

Supply support for SBR40U120CT-G 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The SBR® product line was developed specifically for high-efficiency, high-temperature AC-DC and DC-DC power conversion, targeting replacement of Schottky and ultrafast rectifiers in server, telecom, and industrial power systems.

FAQ

Is the metal tab of SBR40U120CT-G electrically connected to any pin?

Yes-the center pin (Pin 2) and the exposed metal tab are internally connected to the common cathode node. This requires electrical isolation from the heatsink unless the cathode is referenced to system ground. The tab is not insulated and must be mounted with appropriate insulating hardware or dielectric pad when used with grounded heatsinks.

What is the maximum recommended heatsink thermal resistance for continuous 40A operation?

At 40A total (20A per leg), junction temperature must remain ≤150°C. With RθJC = 2.0°C/W and assuming 25°C ambient, maximum allowable RθSA (sink-to-ambient) is approximately 3.5°C/W using RθJA = RθJC + RθCS + RθSA and typical RθCS ≈ 0.5°C/W for mica washer + thermal grease. Forced airflow or larger heatsinks are advised above 60°C ambient.

Does SBR40U120CT-G support reflow soldering per J-STD-020?

Yes-SBR40U120CT-G is qualified for lead-free reflow per J-STD-020D, with peak temperature up to 260°C for 30 seconds. The TO-220AB package uses matte tin plating compatible with standard Pb-free assembly processes; no special pre-bake or moisture sensitivity level (MSL) handling is required.

How does its reverse recovery behavior compare to standard ultrafast rectifiers?

SBR40U120CT-G exhibits soft, non-oscillatory reverse recovery with negligible stored charge (Qrr < 35nC typical), unlike ultrafast rectifiers such as MUR40120CT that show abrupt snap-off and higher Qrr (>100nC). This results in lower switching loss, reduced EMI, and elimination of snubber networks in 200–500kHz converters.