Diodes Incorporated SBR40U150CT

Overview

SBR40U150CT from Diodes Incorporated is a 40A dual common-cathode ultra-low VF super barrier rectifier in TO-220AB package, rated for 150V reverse voltage and 150°C junction operation, delivering 0.80V typical forward voltage at 20A/25°C - optimized for high-efficiency AC/DC secondary-side rectification in server power supplies and telecom rectifiers.

For engineers reviewing the SBR40U150CT datasheet, SBR40U150CT pinout, SBR40U150CT application, or SBR40U150CT equivalent, key selection criteria include per-leg 20A average current rating, 250A non-repetitive surge capability, thermal resistance of 0.6°C/W (junction-to-case), soft switching behavior, and RoHS-compliant matte tin terminals on copper leadframe.

Technical Context

This dual-diode rectifier integrates two independent SBR® elements sharing a common cathode terminal, enabling synchronous or interleaved secondary-side rectification in center-tapped or full-wave bridge configurations. Its patented super barrier structure replaces traditional PN junctions with low-barrier metal-semiconductor interfaces to reduce conduction loss while maintaining high blocking integrity.

Designed for high-temperature reliability, it sustains 100μA max leakage at 150°C under 150V reverse bias and exhibits stable VF drift (0.71V typ at 20A/125°C), supporting compact heatsink designs where RθJC = 0.6°C/W enables efficient thermal transfer to external heatsinks.

Key Specifications

Pinout & Package

Package: TO-220AB - Insulated plastic case with three leads, UL 94V-0 rated, matte tin-plated copper leadframe, 1.85g weight, designed for vertical heatsink mounting via center tab (cathode-connected tab).

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-40CPH015 and MUR4015CT, SBR40U150CT delivers the lowest thermal resistance and most stable VF across temperature - making it optimal for thermally constrained, high-efficiency server and telecom power where junction temperature control directly impacts MTBF.

Availability

SBR40U150CT is available at Aetrix Electronics and suitable for server AC/DC power supplies, telecom rectifier modules, and industrial motor drive auxiliary power stages requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing traceability.

Supply support for SBR40U150CT 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 centers across Asia and manufacturing in China, Taiwan, and the US.

The SBR® product line was developed specifically for high-efficiency secondary-side rectification in switched-mode power supplies, targeting applications where low VF, soft recovery, and high-temperature stability are critical to system-level efficiency and reliability.

FAQ

What is the thermal pad connection on the TO-220AB package?

The center tab (lead 2) is the common cathode and is electrically connected to the internal die cathodes. It must be electrically isolated from the heatsink unless the system design intentionally references the cathode to chassis ground. Thermal interface material should be applied between tab and heatsink to maintain RθJC = 0.6°C/W performance.

Can SBR40U150CT replace standard Schottky diodes in existing designs?

Yes, provided layout accommodates TO-220AB footprint and thermal management accounts for its 0.6°C/W RθJC. Its lower VF (0.80V vs. typical 0.95V for Schottky) reduces conduction loss, but soft recovery may alter snubber requirements - validate EMI and voltage overshoot in final system testing.

Is the SBR40U150CT suitable for automotive under-hood applications?

No - while rated to +150°C junction, it lacks AEC-Q101 qualification, PPAP documentation, and automotive-grade screening. Its datasheet specifies industrial/telecom use only; automotive applications require qualified alternatives such as Diodes' APx series AEC-Q101 SBRs.

How does the "U" in SBR40U150CT denote device characteristics?

The "U" suffix indicates ultra-low forward voltage grade within Diodes' SBR family. It distinguishes this variant from standard SBR40xxCT parts (e.g., SBR40150CT) which have higher VF (0.88V typ). The "U" grade achieves lower barrier height via proprietary metallization and epitaxial layer tuning.