Diodes Incorporated SBR40U300CT-G

Overview

SBR40U300CT-G from Diodes Incorporated is a 300V, 40A dual common-cathode super barrier rectifier in TO220AB package, featuring ultra-low forward voltage (0.73V @ 20A, 125°C), soft fast switching (t_RR = 26–35 ns), and +175°C junction rating-designed for high-efficiency AC/DC front-end rectification in industrial SMPS and server power supplies.

For engineers reviewing the SBR40U300CT-G datasheet, SBR40U300CT-G pinout, SBR40U300CT-G application, or SBR40U300CT-G equivalent, key selection criteria include forward voltage at elevated temperature, reverse recovery behavior under di/dt stress, thermal resistance (R_θJA = 52°C/W), and RoHS-compliant "Green" packaging compliance per EU Directive 2015/863/EU.

Technical Context

This dual-leg super barrier rectifier integrates two independent anode terminals sharing a common cathode, enabling synchronous half-bridge or dual-phase rectifier configurations. Its patented SBR® technology replaces conventional PN-junction physics with a metal-semiconductor barrier engineered for lower V_F and reduced Q_rr versus standard Schottky or fast recovery diodes.

The device operates up to +175°C junction temperature with leakage current limited to 10 µA at 300V and 25°C, and 10 mA at 300V and 125°C-enabling stable performance in thermally constrained environments without forced air cooling.

Key Specifications

Pinout & Package

Package: TO220AB, molded plastic case (UL 94V-0), matte tin-plated copper lead frame, lead-free and halogen-free ("Green") compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-40CPH03-M3 and MUR460G, SBR40U300CT-G delivers superior thermal efficiency at high ambient temperatures and lower EMI due to its soft recovery profile-making it optimal for compact, high-power-density 100–500 kHz SMPS where thermal and noise constraints dominate.

Availability

SBR40U300CT-G is available at Aetrix Electronics and suitable for server power supplies, industrial AC/DC front-ends, and telecom rectifier modules requiring stable component supply, long-lifecycle support, and RoHS 3-compliant manufacturing.

Supply support for SBR40U300CT-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, specializing in high-performance power management, signal integrity, and protection solutions for industrial, computing, and communications markets.

SBR40U300CT-G belongs to the Super Barrier Rectifier (SBR®) product line, engineered specifically to replace Schottky and fast recovery diodes in high-current, high-temperature rectification applications where low V_F, soft switching, and reliability are critical.

FAQ

What is the maximum continuous current rating per anode of SBR40U300CT-G?

The device is rated for 20A average forward current per anode leg at TA = 25°C with appropriate heatsinking. Total device current is 40A, but thermal coupling between legs requires derating above 25°C ambient-see Fig.3 derating curve. At 70°C ambient with RθJA = 52°C/W, maximum per-leg current drops to ~14A.

Does SBR40U300CT-G require a heatsink for 40A operation?

Yes. With RθJA = 52°C/W and 0.73V forward drop at 20A per leg, power dissipation exceeds 29W at full load. Without a heatsink, junction temperature would exceed 175°C even at room ambient. A minimum 10°C/W heatsink (e.g., 37 × 15 × 50 mm black aluminum) is required to sustain 40A at 50°C ambient per datasheet Note 6.

How does the soft recovery characteristic benefit EMI performance?

Soft recovery limits the rate of current fall (di/dt) during turn-off, reducing high-frequency ringing and voltage overshoot across parasitic inductances. Measured t_RR of 26–35 ns with low I_RR peak (<0.25A) suppresses >30 MHz emissions by 8–10 dB compared to standard ultrafast diodes-critical for meeting CISPR-32 Class B conducted EMI limits.

Is SBR40U300CT-G suitable for use in life support equipment?

No. Per Diodes Incorporated's Life Support Notice, this device is explicitly not authorized for use in life support devices or systems-including implantable, sustaining, or safety-critical applications-without express written approval from Diodes' CEO. It is intended for industrial, computing, and telecom power applications only.