Diodes Incorporated SBR20U40CT

Overview

SBR20U40CT from Diodes Incorporated is a 20A dual common-cathode Super Barrier Rectifier optimized for high-efficiency DC-DC conversion in server power supplies and telecom rectifiers, featuring 40V V_RRM, 0.44V typical V_F at 10A/25°C, and TO-220AB package with isolated heatsink mounting capability.

For engineers reviewing the SBR20U40CT datasheet, SBR20U40CT pinout, SBR20U40CT application, or SBR20U40CT equivalent, key selection criteria include forward voltage stability across temperature, surge current handling (200A IFSM), thermal resistance (2°C/W R_θJC), and RoHS/Green compliance for industrial-grade power systems.

Technical Context

This dual-diode rectifier uses patented Super Barrier technology to achieve lower forward voltage than Schottky diodes while maintaining superior high-temperature leakage performance-IR remains ≤100µA at 125°C and 40V reverse bias. Its soft, fast switching minimizes EMI in high-frequency SMPS designs.

The device is rated for 10A average current per leg (20A total), with derating to 0A at 150°C ambient. Isolation voltage of 2000V_AC applies only to the ITO-220AB variant; the CT suffix denotes TO-220AB with non-isolated tab.

Key Specifications

Pinout & Package

Package: TO-220AB - Molded plastic case with copper leadframe, matte tin-plated terminals, UL 94V-0 flammability rating, and 1.85g mass. Tab is electrically connected to cathode.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current, low-V_F rectifier applications.

Compared with SBRT20U40CT, SBR20U40CT offers proven field reliability at standard thermal performance; versus MBR2045CT, it delivers 25% lower conduction loss and stable leakage up to 125°C-critical for sealed industrial enclosures.

Availability

SBR20U40CT is available at Aetrix Electronics and suitable for server power supplies, telecom rectifiers, and industrial motor drives requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for SBR20U40CT 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 centers across Asia and manufacturing in China, Taiwan, and the U.S.

The SBR® Super Barrier Rectifier product line targets high-efficiency AC-DC and DC-DC power conversion in datacenter, telecom, and industrial equipment where low V_F and high-temperature stability are mandatory.

FAQ

What is the electrical connection of the TO-220AB tab on SBR20U40CT?

The metal tab on the SBR20U40CT TO-220AB package is electrically connected to the common cathode (Pin 2). It must be electrically isolated from the heatsink unless the heatsink is referenced to the cathode potential. No isolation washer is required if the mechanical mounting surface is at cathode potential.

Can SBR20U40CT replace a standard 20A Schottky rectifier in an existing design?

Yes-SBR20U40CT is pin-compatible with industry-standard TO-220AB dual Schottky rectifiers (e.g., MBR2045CT) and offers lower V_F and better high-temperature leakage. Thermal design should verify R_θJC compatibility, but no layout change is needed.

What is the maximum allowable case temperature during continuous operation?

The maximum case temperature is derived from the 150°C maximum junction temperature and thermal resistance: T_C = T_J − (P_D × R_θJC). At 10A/25°C, P_D ≈ 4.4W → T_C ≤ 141°C. Derating curves in DS30975 show 10A allowed up to 100°C ambient with adequate heatsinking.

Is SBR20U40CT suitable for automotive under-hood applications?

Yes-its −65°C to +150°C operating range, Pb-free/Green compliance, and AEC-Q200-untested (but widely deployed) robustness make it suitable for auxiliary 12V PSUs in commercial vehicles. For safety-critical ADAS modules, Diodes' AEC-Q101-qualified SBR variants are recommended instead.