Diodes Incorporated SBR4045CTFP

Overview

SBR4045CTFP from Diodes Incorporated is a 40A dual common-cathode Super Barrier Rectifier rated for 45V peak reverse voltage, featuring low forward voltage (0.50 V at 20 A, 125°C), soft fast switching, and ITO-220AB insulated package with 2000 V isolation. It serves as a high-efficiency output rectifier in DC-DC converters and AC-DC front-ends for telecom power supplies.

For engineers reviewing the SBR4045CTFP datasheet, SBR4045CTFP pinout, SBR4045CTFP application, or SBR4045CTFP equivalent, key selection criteria include thermal resistance (4°C/W junction-to-case), high-temperature leakage stability (100 µA max at 125°C), and RoHS-compliant green molding compound compatibility with automated reflow and wave soldering.

Technical Context

This device integrates two independent super barrier diode elements in a single ITO-220AB package, sharing a common cathode terminal. Its patented super barrier structure replaces traditional PN junctions with metal-semiconductor interfaces to reduce forward voltage while maintaining low reverse leakage across -65°C to +150°C operating range.

The ITO-220AB package provides electrical isolation between leads and heatsink (2000 VAC, 3 sec), enabling direct mounting to grounded heat sinks without insulating hardware. Thermal performance is characterized per leg, with derating curves confirming 40 A total average current capability only when both legs are equally loaded and case temperature remains ≤75°C.

Key Specifications

Pinout & Package

Package: ITO-220AB - Insulated TO-220 variant with electrically isolated tab (heatsink interface), matte tin-plated copper leadframe, UL 94V-0 molded plastic body, and 1.65 g mass.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS40H45CG and MBR4045CT, SBR4045CTFP delivers lower forward voltage at elevated temperature, guaranteed isolation, and halogen-free compliance-making it optimal for thermally constrained, safety-certified, and environmentally regulated power systems.

Availability

SBR4045CTFP is available at Aetrix Electronics and suitable for telecom DC-DC converters, industrial AC-DC power supplies, and server PSU hold-up stages requiring stable component supply, long-lifecycle assurance, and RoHS/green compliance.

Supply support for SBR4045CTFP 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, high-reliability power conversion in telecom, computing, and industrial equipment-designed to replace Schottky diodes where low VF and high-temperature stability are critical.

FAQ

What is the maximum continuous junction temperature for SBR4045CTFP?

The absolute maximum junction temperature is +150°C, with derating beginning at case temperatures above 75°C. At 20 A per leg and 4°C/W RθJC, the junction rises 80°C above case temperature-so sustained 150°C junction requires case temp ≤70°C. Operation beyond this limit risks accelerated parametric drift and reduced reliability.

Can SBR4045CTFP be used as a direct replacement for MBR4045CT in existing designs?

No-while both are 40 A, 45 V dual common-cathode rectifiers in TO-220 variants, SBR4045CTFP uses ITO-220AB (isolated tab) versus TO-220AB (conductive tab). Mounting without insulating hardware will short the cathode to heatsink. Layout and thermal interface must be revised to leverage its isolation benefit.

Does SBR4045CTFP require a heatsink in all applications?

Yes-its 4°C/W RθJC and 20 A per-leg rating demand active thermal management. At 20 A and 0.50 V VF, power dissipation is 10 W per leg. Without a heatsink, junction temperature would exceed 150°C within seconds. Minimum heatsink thermal resistance must be ≤2°C/W (including interface) for safe 150°C operation.

Is the green compound in SBR4045CTFP compliant with JEDEC J-STD-609A Class 1?

Yes-the device meets JEDEC J-STD-609A Class 1 definition for halogen-free status: total bromine + chlorine ≤1500 ppm (with each <900 ppm), and antimony ≤1000 ppm. This is verified via material declaration and third-party testing per IEC 62321-2.