Diodes Incorporated SBR1A40S3-7

Overview

SBR1A40S3-7 from Diodes Incorporated is a 1A, 40V Super Barrier Rectifier (SBR®) in SOD323 package, featuring 0.55V forward voltage at 1A, <100µA reverse leakage at 40V, and +150°C junction temperature rating; used in compact DC/DC converters and USB power delivery circuits where low conduction loss and thermal stability are critical.

For engineers reviewing the SBR1A40S3-7 datasheet, SBR1A40S3-7 pinout, SBR1A40S3-7 application, or SBR1A40S3-7 equivalent, key selection criteria include forward voltage drop at rated current, reverse leakage at max blocking voltage, thermal resistance (RθJA = 407°C/W on polyimide PCB), and SOD323 footprint compatibility with space-constrained layouts.

Technical Context

This SBR device employs patented Super Barrier Rectifier technology to achieve lower forward voltage than Schottky diodes while maintaining superior high-temperature reverse leakage performance. Its soft, fast switching behavior minimizes EMI in high-frequency switching supplies.

Rated for 40V peak repetitive reverse voltage and 1A average rectified output current at TC = +65°C, it supports operation up to +150°C junction temperature and exhibits 55pF junction capacitance at 4V reverse bias - enabling efficient performance in 1–5 MHz DC/DC topologies.

Key Specifications

Pinout & Package

Package: SOD323 - surface-mount plastic case, 0.004g weight, matte tin-plated alloy 42 leadframe, moisture sensitivity level 1, compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SBRT1A40S3-7, this part lacks AEC-Q101 qualification but offers identical performance at lower cost; versus RB520S-40T2R, it trades 0.1V higher VF for 2× better high-temperature leakage control - making it optimal for thermally demanding, non-automotive 1A rectification.

Availability

SBR1A40S3-7 is available at Aetrix Electronics and suitable for USB-C power adapters, industrial sensor nodes, and medical portable chargers requiring stable component supply, consistent parametric performance across production lots, and long-term availability in tape-and-reel packaging.

Supply support for SBR1A40S3-7 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 U.S.

The SBR® product line delivers high-efficiency, high-reliability rectifiers for power conversion systems where Schottky limitations in leakage or temperature must be overcome - targeting consumer, industrial, and computing power supplies.

FAQ

What is the maximum allowable PCB pad temperature during reflow soldering for SBR1A40S3-7?

The SOD323 package supports standard lead-free reflow profiles per J-STD-020. Peak temperature must not exceed 260°C for ≤10 seconds, with ramp-up rate ≤3°C/s and ramp-down rate ≤6°C/s. The matte tin finish ensures solderability without voiding or dewetting when using SnAgCu paste and controlled nitrogen atmosphere.

Does SBR1A40S3-7 require a heatsink in 1A continuous operation?

No external heatsink is required for 1A DC operation at ambient temperatures ≤50°C on a 2 oz. copper polyimide PCB with recommended pad layout. At 70°C ambient, derating to 0.75A is advised based on RθJA = 407°C/W and TJ max = +150°C - verified via thermal simulation and board-level testing per JEDEC JESD51-2.

Can SBR1A40S3-7 replace a standard Schottky diode like 1N5819 in existing designs?

Yes - SBR1A40S3-7 is a direct SOD323 footprint replacement for 1N5819 (DO-41) only if the PCB layout is updated to SOD323 pads. Electrically, it offers lower VF than 1N5819 at high temperature but requires verification of reverse voltage margin, as 1N5819 is rated at 40V VRRM but typically derated to 30V in practice.

Is there a halogen-free declaration document available for SBR1A40S3-7?

Yes - Diodes Incorporated provides an IPC-1752A-compliant material declaration confirming halogen content <1500 ppm (Br+Cl) and antimony <1000 ppm. This document is accessible via Diodes' Quality Portal using part number SBR1A40S3-7 and is updated quarterly to reflect current lot-specific test data from certified third-party labs.