Diodes Incorporated SBR3U40S1FQ-7

Overview

SBR3U40S1FQ from Diodes Incorporated is a 40 V, 3 A ultra-low forward voltage super barrier rectifier in SOD123F package, featuring VF ≤ 0.49 V at 3 A and IR ≤ 180 µA at 40 V/25°C, with AEC-Q101 qualification for automotive reverse-polarity protection and DC-DC converter output rectification.

For engineers reviewing the SBR3U40S1FQ datasheet, SBR3U40S1FQ pinout, SBR3U40S1FQ application, or SBR3U40S1FQ equivalent, key selection criteria include forward voltage drop at 3 A, high-temperature leakage stability up to +150°C junction, surge rating (IFSM = 50 A), and SOD123F thermal resistance (RθJA = 100 °C/W).

Technical Context

This device implements patented Super Barrier Rectifier (SBR®) technology to achieve lower VF than Schottky diodes while maintaining higher temperature stability and reduced IR drift. Its interlocking clip design enables robust surge handling (50 A IFSM) without bond-wire limitations.

It operates across –65°C to +150°C junction range, supports DC blocking up to 40 V, and delivers 3 A average rectified current with derating above +25°C ambient-enabling use in space-constrained, thermally demanding automotive and industrial power rails.

Key Specifications

Pinout & Package

Package: SOD123F - surface-mount, single-diode plastic package with cathode band marking, 0.016 g weight, UL 94V-0 molding compound, and matte tin–plated copper leadframe.

Key Features

Applications

Availability

SBR3U40S1FQ is available at Aetrix Electronics and suitable for automotive reverse-polarity protection, DC-DC converter output rectification, and AC-DC auxiliary supply applications requiring stable component supply, AEC-Q101 compliance, and high-temperature reliability.

Supply support for SBR3U40S1FQ 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® product line delivers high-efficiency rectification solutions optimized for automotive, industrial, and computing power systems where low VF, high surge tolerance, and extended temperature operation are critical.

FAQ

What is the maximum junction temperature and how does it affect layout?

The SBR3U40S1FQ has a maximum junction temperature of +150°C. To maintain this limit, PCB layout must provide adequate copper area: the datasheet specifies a 0.4" × 0.5" 2 oz copper pad yields RθJA = 100 °C/W. Reducing pad size increases thermal resistance and risks exceeding TJ under sustained 3 A load.

Is SBR3U40S1FQ pin-compatible with standard SOD123 Schottky diodes?

Yes-SBR3U40S1FQ uses the industry-standard SOD123F footprint, identical to SOD123 but with enhanced thermal pad (He = 3.50 mm). It is mechanically compatible with SOD123 land patterns, though thermal performance improves with the larger He dimension and recommended pad layout from Diodes' package outline document.

How does its reverse leakage compare to conventional Schottky diodes at high temperature?

At +125°C and VR = 40 V, SBR3U40S1FQ exhibits IR ≤ 60 µA-significantly lower than typical Schottky diodes (>500 µA at same conditions). This stability stems from SBR®'s hybrid structure, which suppresses thermionic emission drift, making it suitable for always-on automotive modules.

Does this part require derating in high-humidity environments?

No special derating is required: the SOD123F package meets J-STD-020 Moisture Sensitivity Level 1, meaning it is not moisture-sensitive and can be stored indefinitely at ≤30°C/60% RH without baking prior to reflow. The green molding compound also provides inherent resistance to humidity-induced degradation.