Diodes Incorporated SBR4045CT

Overview

SBR4045CT from Diodes Incorporated is a 40A dual common-cathode super barrier rectifier in TO-220AB package, rated for 45V peak reverse voltage and 0.50V typical forward voltage at 20A/25°C. It delivers soft, fast switching with excellent high-temperature stability and is optimized for DC-DC secondary-side rectification in high-efficiency power supplies.

For engineers reviewing the SBR4045CT datasheet, SBR4045CT pinout, SBR4045CT application, or SBR4045CT equivalent, key selection criteria include forward voltage drop at 20A, thermal resistance (2°C/W junction-to-case), leakage current at 125°C, surge current rating (280A), and RoHS-compliant green packaging compliance.

Technical Context

This dual-diode rectifier integrates two independent SBR® elements sharing a common cathode terminal, enabling synchronous-like efficiency without gate drive complexity. Its patented super barrier structure replaces traditional PN junctions with low-barrier metal-semiconductor interfaces, reducing forward conduction loss while maintaining low reverse recovery charge.

The device operates across –65°C to +150°C junction temperature range and supports single-phase, half-wave rectification with 20A average current per leg (40A total). Derating is required for capacitive loads (–20% current) and elevated case temperatures per Figure 1.

Key Specifications

Pinout & Package

Package: TO-220AB - Insulated plastic case with copper leadframe, UL 94V-0 rated, 1.85g weight, matte tin-plated terminals solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-40CPH045 and MBR4045CT, the SBR4045CT offers the best balance of low VF (0.50V), low leakage (100µA), and TO-220AB compatibility-making it optimal for space-constrained, thermally demanding 40A rectification where thermal resistance and efficiency are prioritized over absolute lowest cost.

Availability

SBR4045CT is available at Aetrix Electronics and suitable for server VRM output stages, industrial AC-DC power supplies, and telecom DC-DC bricks requiring stable component supply, RoHS-compliant green packaging, and high-temperature reliability.

Supply support for SBR4045CT 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 power conversion in computing, industrial, and telecom systems where low forward voltage and thermal robustness are essential for minimizing conduction losses and improving system-level efficiency.

FAQ

What is the maximum allowable case temperature for continuous 40A operation?

The SBR4045CT supports 40A total current only when case temperature is maintained at ≤80°C, based on its 2°C/W RθJC and 150°C max junction temperature. At 25°C ambient, this requires a heatsink with ≤3.5°C/W thermal resistance. Derating curves in Figure 1 confirm 20A per leg at 100°C case temperature.

Can SBR4045CT replace a standard Schottky diode like SB540 in a 24V/10A supply?

Yes, but with design validation: SBR4045CT's 45V VRRM exceeds SB540's 40V rating, and its 0.50V VF at 20A is lower than SB540's ~0.55V at 5A. However, its dual-anode layout requires matching PCB footprint and thermal management for 40A-rated package-not just 10A use. Pin compatibility is not guaranteed.

Is isolation between terminals and heatsink provided in the TO-220AB package?

No-the standard TO-220AB package used in SBR4045CT has electrically conductive mounting tab (Pin 2/cathode). Electrical isolation requires an insulating washer or pad. In contrast, the ITO-220AB variant (SBR4045CTFP) provides 2000VAC isolation from terminals to heatsink per test condition.

Does the "Green" designation affect electrical performance?

No-the halogen- and antimony-free green molding compound meets environmental standards without altering forward voltage, leakage, or thermal resistance. Performance parameters match non-Green versions; the designation solely reflects material composition compliance per Diodes Incorporated's definition (Br+Cl <1500ppm, Sb <1000ppm).