Diodes Incorporated SBR20U40CTFP

Overview

SBR20U40CTFP from Diodes Incorporated is a 20A dual common-cathode Super Barrier Rectifier in ITO-220AB package, rated for 40V peak reverse voltage, with typical forward voltage of 0.44V at 10A/25°C and thermal resistance of 4°C/W (junction-to-case, per leg). It delivers soft, fast switching and low conduction loss in DC-DC output rectification.

For engineers reviewing the SBR20U40CTFP datasheet, SBR20U40CTFP pinout, SBR20U40CTFP application, or SBR20U40CTFP equivalent, key selection criteria include forward voltage at high temperature, surge current capability (200A IFSM), isolation rating (2000VAC), and RoHS-compliant green packaging with halogen/antimony-free molding compound.

Technical Context

This dual-leg rectifier integrates two independent super barrier diodes sharing a common cathode terminal, enabling synchronous half-wave or center-tapped full-wave configurations. Its patented super barrier structure replaces traditional PN junctions with a metal-semiconductor composite barrier, achieving lower VF than Schottky diodes while maintaining higher thermal stability up to +150°C.

The ITO-220AB package provides electrical isolation between terminals and heatsink (2000VAC, 3 sec), supporting direct-mount thermal management without insulating pads. Device operation is characterized by low leakage (<0.5mA at 40V/25°C) and soft reverse recovery-critical for reducing EMI in high-frequency switch-mode power supplies.

Key Specifications

Pinout & Package

ITO-220AB package: insulated TO-220 variant with electrically isolated tab (heatsink interface), three leads (two anodes, one common cathode), UL 94V-0 molded plastic body, matte tin-plated copper leadframe, weight ≈1.65 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SBRT20U40CTFP and MBR2045CT, SBR20U40CTFP offers optimal balance of low VF, certified isolation, and surge robustness-making it preferred for space-constrained, safety-isolated, and thermally aggressive applications where reliability trumps marginal BOM cost savings.

Availability

SBR20U40CTFP is available at Aetrix Electronics and suitable for server VRM output stages, industrial 24V DC-DC converters, and automotive infotainment power supplies requiring stable component supply, long-lifecycle support, and RoHS-compliant green packaging.

Supply support for SBR20U40CTFP 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 fast-recovery diodes in high-efficiency, high-temperature power conversion-targeting server, telecom, and automotive power systems demanding low VF, soft switching, and robust thermal performance.

FAQ

What is the difference between SBR20U40CTFP and SBR20U40CT?

SBR20U40CTFP uses the insulated ITO-220AB package with 2000VAC isolation between terminals and heatsink, while SBR20U40CT uses standard TO-220AB without isolation. Both share identical electrical specs, pinout configuration, and thermal resistance per leg (4°C/W vs. 2°C/W for TO-220AB), but only the FP variant allows direct heatsink mounting in isolated topologies.

Can SBR20U40CTFP be used in place of a single-diode TO-220 part?

Yes, but only one anode should be used with the common cathode-effectively operating as a single 10A rectifier. The unused anode must be left unconnected or tied to cathode (not recommended). Derating is not required, but thermal design must account for reduced heatsinking efficiency due to ITO-220AB's higher RθJC (4°C/W vs. 2°C/W for TO-220AB).

Does SBR20U40CTFP require a heatsink in 10A continuous operation?

Yes. At 10A and 0.44V VF, power dissipation is ~4.4W per leg. With RθJC = 4°C/W and max TJ = 150°C, a heatsink maintaining TC ≤ 106°C is required. A 45mm × 20mm × 12mm black aluminum heatsink (as referenced in Note 7) achieves this under natural convection in typical enclosures.

Is the "Green" designation verified per JEDEC JESD22-A112?

Yes. SBR20U40CTFP meets Diodes Incorporated's "Green" definition: <900ppm bromine, <900ppm chlorine (<1500ppm total Br+Cl), and <1000ppm antimony-verified per internal material testing and third-party lab reports aligned with JEDEC JESD22-A112 and IEC 62321-2 standards.