Diodes Incorporated SBR4040CTFP

Overview

SBR4040CTFP from Diodes Incorporated is a 40A dual common-cathode Super Barrier Rectifier rated for 40V peak reverse voltage, featuring low forward voltage (0.44V @ 20A, 25°C), soft fast switching, and ITO-220AB insulated package with 2000V isolation. It serves as an output rectifier in high-efficiency DC/DC converters and AC/DC power supplies operating at elevated temperatures.

For engineers reviewing the SBR4040CTFP datasheet, SBR4040CTFP pinout, SBR4040CTFP application, or SBR4040CTFP equivalent, key selection criteria include forward voltage drop at 20A, thermal resistance (4°C/W junction-to-case), leakage current at 125°C, isolation voltage rating, and compatibility with TO-220 footprint heatsinking layouts.

Technical Context

This dual-leg rectifier integrates two independent Super Barrier diode elements sharing a common cathode terminal, enabling synchronous half-wave or center-tapped full-wave rectification. Its patented super barrier structure delivers lower VF than Schottky diodes while maintaining superior high-temperature leakage performance.

The ITO-220AB package provides electrical isolation between terminals and heatsink, supporting direct mounting to grounded metal chassis without insulating hardware. Thermal derating begins at 25°C ambient, with full 40A rating only achievable with adequate heatsinking per Figure 4.

Key Specifications

Pinout & Package

Package: ITO-220AB - Insulated plastic case with integral heatsink tab, UL 94V-0 rated, matte tin-plated copper leadframe, 1.65g weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-40CPH04 and MBR4045CT, SBR4040CTFP uniquely combines ITO-220AB isolation, lowest VF among 40V-class 40A rectifiers, and industry-leading high-temperature leakage control - critical for compact, chassis-grounded, thermally constrained power systems.

Availability

SBR4040CTFP is available at Aetrix Electronics and suitable for server VRMs, industrial AC/DC adapters, and telecom DC/DC bricks requiring stable component supply, RoHS compliance, and halogen-free manufacturing.

Supply support for SBR4040CTFP 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 the Americas.

The SBR® Super Barrier Rectifier product line targets high-efficiency power conversion in computing, industrial, and telecom infrastructure where low VF, thermal stability, and soft switching are essential for system-level efficiency and reliability.

FAQ

What is the maximum continuous current rating per diode leg in SBR4040CTFP?

The SBR4040CTFP is rated for 20A average forward current per leg at TA = 25°C with appropriate heatsinking. Total device current is 40A, but each internal diode handles up to 20A continuously. Derating is required above 25°C ambient per Figure 4 in the datasheet - at 70°C ambient, max per-leg current drops to approximately 12A.

Does SBR4040CTFP require thermal interface material when mounted to a heatsink?

No. The ITO-220AB package provides 2000V AC isolation between terminals and the metal tab, allowing direct mounting to a grounded heatsink without mica washers or thermal pads. However, thermal grease or phase-change material is still recommended between the tab and heatsink surface to minimize junction-to-ambient thermal resistance.

How does SBR4040CTFP's forward voltage compare to standard Schottky rectifiers at high temperature?

At 125°C junction temperature, SBR4040CTFP maintains VF = 0.48V @ 20A - only +0.04V higher than its 25°C value. Standard Schottky rectifiers typically increase VF by +0.15–0.25V over the same range, making SBR4040CTFP significantly more efficient in thermally demanding applications like enclosed power supplies.

Can SBR4040CTFP replace TO-220AB-packaged rectifiers in existing PCB layouts?

Yes - the ITO-220AB package shares identical lead spacing, hole pattern, and outline dimensions with standard TO-220AB, enabling drop-in replacement. The insulated tab does not affect PCB footprint or soldering process, though mechanical mounting torque and heatsink interface design should be verified for optimal thermal performance.