Diodes Incorporated SBR20U40CT-G

Overview

SBR20U40CT-G from Diodes Incorporated is a 20A dual common-cathode Super Barrier Rectifier in TO-220AB package, rated for 40V peak reverse voltage, with typical forward voltage of 0.44V at 10A/25°C and 0.47V at 10A/125°C, designed for high-efficiency DC-DC output rectification in industrial power supplies.

For engineers reviewing the SBR20U40CT-G datasheet, SBR20U40CT-G pinout, SBR20U40CT-G application, or SBR20U40CT-G equivalent, key selection criteria include low VF stability over temperature, soft switching behavior to reduce EMI, 200A non-repetitive surge rating, and RoHS-compliant green molding compound compliance per Diodes DS30975 Rev. 7-2.

Technical Context

This dual-leg rectifier integrates two independent 10A-rated super barrier diodes sharing a common cathode terminal, enabling synchronous half-wave or center-tapped transformer secondary rectification. Its patented super barrier structure replaces traditional PN junctions with metal-semiconductor interfaces, delivering lower VF than Schottky diodes while maintaining higher thermal stability than standard silicon rectifiers.

The device operates across –65°C to +150°C junction temperature range with 2°C/W typical junction-to-case thermal resistance (per leg), and exhibits <100µA leakage at 40V/125°C - critical for standby efficiency in regulated offline SMPS designs where reverse recovery loss must be minimized.

Key Specifications

Pinout & Package

TO-220AB package with isolated tab (electrically connected to cathode), 3-terminal configuration: Pin 1 = Anode 1, Pin 2 = Cathode (common), Pin 3 = Anode 2. Mounting tab serves as thermal path and electrical connection to cathode node.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SBRT20U40CT, SBR20U40CT-G provides guaranteed isolation between tab and circuit ground; versus MBR2045CT, it delivers 0.11V lower VF at 10A and 10× lower leakage at 125°C - directly improving efficiency and thermal margin in thermally constrained systems.

Availability

SBR20U40CT-G is available at Aetrix Electronics and suitable for industrial power supplies, telecom rectifier modules, and LED driver secondary stages requiring stable component supply with green material compliance and traceable sourcing.

Supply support for SBR20U40CT-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® Super Barrier Rectifier product line targets high-efficiency AC-DC and DC-DC power conversion, specifically addressing the need for low-VF, high-temperature-stable rectification in space-constrained and thermally demanding applications.

FAQ

What is the thermal interface requirement for SBR20U40CT-G when mounted to a heatsink?

The TO-220AB package features an electrically isolated mounting tab connected to the common cathode. Thermal interface material must provide both thermal conductivity and electrical isolation - minimum recommended thermal resistance is 0.5°C·in²/W using standard silicone-based TIM. Mechanical torque on M3 screw must not exceed 0.5 N·m to avoid package damage.

Can SBR20U40CT-G replace standard Schottky rectifiers in existing designs?

Yes, with verification of voltage rating and layout clearance. Its 40V VRRM matches common 36V–42V Schottky ratings, and identical TO-220AB footprint allows drop-in replacement. However, its lower VF reduces conduction loss, potentially requiring minor heatsink derating or improved efficiency validation at full load and elevated temperature.

Is the "-G" suffix solely a material designation, or does it affect electrical performance?

The "-G" suffix indicates halogen- and antimony-free green molding compound per Diodes' specification (Br+Cl <1500ppm, Sb <1000ppm); electrical parameters, thermal characteristics, and reliability testing are identical to non-G versions. No performance trade-offs are introduced by the green compound.

How does the soft switching behavior impact EMI filter design?

Soft switching reduces di/dt-induced voltage spikes during turn-off, lowering high-frequency noise content above 30MHz. This permits smaller Y-capacitors and reduced common-mode choke size in Class B EMI filters - verified via conducted emissions testing per CISPR 32 in 50W flyback reference designs using this device.