Diodes Incorporated SBR40U300CTB-13

Overview

SBR40U300CTB-13 from Diodes Incorporated is a 40A dual common-cathode Super Barrier Rectifier with 300V peak reverse voltage, ultra-low 0.81V forward voltage at 20A/25°C, soft fast switching (trr ≤ 35ns), and 175°C junction rating-designed for high-efficiency AC/DC and DC/DC secondary-side rectification in server power supplies.

For engineers reviewing the SBR40U300CTB-13 datasheet, SBR40U300CTB-13 pinout, SBR40U300CTB-13 application, or SBR40U300CTB-13 equivalent, key selection criteria include forward voltage at 20A, thermal resistance (RθJC = 2°C/W), leakage current at 125°C, reverse recovery time under di/dt = 100A/μs, and D2PAK package compatibility with high-current PCB layouts.

Technical Context

This dual-diode rectifier integrates two independent 300V/20A legs in a common-cathode configuration, enabling synchronous or center-tapped secondary rectification. Its patented Super Barrier structure replaces traditional PN junctions with metal-semiconductor barriers to achieve lower VF and higher temperature stability than standard Schottky diodes.

It operates up to 175°C junction temperature with only 100μA leakage at 300V/25°C and 50mA at 300V/125°C, and exhibits soft reverse recovery (trr ≤ 35ns) under 1A/30V/100A/μs conditions-critical for reducing EMI in high-frequency SMPS designs.

Key Specifications

Pinout & Package

Package: D2PAK (TO-263AB), surface-mount, single-row 3-terminal outline with exposed cathode tab for thermal conduction. Case material is UL 94V-0 molded plastic; terminals are matte tin over copper leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-40CPH03-M3, SBR40U300CTB-13 offers 30V higher blocking margin critical for universal-input PSUs; versus MUR4030CT, it delivers 0.34V lower VF and 25ns faster trr-directly enabling >1% system efficiency gain and relaxed EMI filtering.

Availability

SBR40U300CTB-13 is available at Aetrix Electronics and suitable for server power supplies, industrial DC/DC converters, telecom rectifier modules, and renewable energy inverters requiring stable component supply across multi-year production cycles.

Supply support for SBR40U300CTB-13 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 was developed to replace conventional Schottky and ultrafast rectifiers in high-efficiency, high-temperature power conversion-targeting datacenter, industrial, and telecom infrastructure.

FAQ

What is the maximum continuous current per anode leg at 100°C ambient?

At 100°C ambient with standard FR-4 PCB (2 oz copper, minimum recommended pad layout), the maximum continuous current per leg is 12.5A. This is derived from the forward current derating curve (Fig.3), where IO drops linearly from 20A at 75°C to ~12.5A at 100°C using RθJA = 10°C/W. Forced air or heatsink mounting extends this rating.

Is SBR40U300CTB-13 pin-compatible with standard TO-220 or TO-263 dual-diode rectifiers?

Yes, SBR40U300CTB-13 uses the industry-standard D2PAK (TO-263AB) package with 3-pin single-row footprint: Anode 1, Cathode (tab), Anode 2. It shares identical mechanical dimensions and pad layout with MUR4030CT, VS-40CPH03-M3, and other D2PAK dual common-cathode rectifiers, enabling drop-in replacement on existing PCBs.

Does the device require a gate drive or control signal?

No. SBR40U300CTB-13 is a passive rectifier-no gate drive, bias, or control signal is needed. It conducts when forward-biased (anode > cathode) and blocks when reverse-biased, operating autonomously like any diode. Its "soft switching" behavior is inherent to the Super Barrier structure, not externally controlled.

How does leakage current change at 150°C junction temperature?

Per Figure 2, leakage current increases exponentially with temperature: at VR = 300V, IR ≈ 250μA at 150°C (interpolated between 125°C and 175°C curves). This remains well within safe operating limits for most applications, as the device's 175°C rating ensures functional margin even with elevated leakage.