Diodes Incorporated SBR140S3-7

Overview

SBR140S3-7 from Diodes Incorporated is a 1 A, 40 V Super Barrier Rectifier in SOD-323 package, featuring low forward voltage (0.41 V @ 700 mA, 25°C), low reverse leakage (8 µA @ 10 V, 25°C), and 150°C junction temperature rating-designed for high-efficiency DC/DC output rectification in space-constrained portable power supplies.

For engineers reviewing the SBR140S3-7 datasheet, SBR140S3-7 pinout, SBR140S3-7 application, or SBR140S3-7 equivalent, key selection criteria include forward voltage at elevated temperature, reverse leakage under full blocking voltage, thermal resistance (407°C/W on polyimide PCB), and RoHS-compliant "Green" packaging for consumer-grade USB-powered devices.

Technical Context

The SBR140S3-7 employs patented Super Barrier Rectifier technology to achieve Schottky-like forward conduction with significantly lower reverse leakage than standard Schottky diodes-enabling stable operation up to 150°C junction temperature without thermal runaway. Its soft, fast switching behavior minimizes EMI in high-frequency synchronous buck converters.

Rated for 40 V repetitive reverse voltage and 20 A non-repetitive surge current (8.3 ms half-sine), it supports compact secondary-side rectification in 5 V/1 A USB-C PD adapters and battery charging circuits where thermal management is limited by SOD-323 footprint constraints.

Key Specifications

Pinout & Package

Package: SOD-323 - surface-mount plastic case, 2.5 mm × 1.3 mm footprint, matte tin-plated Alloy 42 leadframe, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SBRT140S3-7, the SBR140S3-7 offers optimal balance of surge margin and thermal robustness for regulated 5 V outputs; versus VB140L-G, its 150°C rating and lower leakage enable reliable operation in thermally aggressive industrial deployments.

Availability

SBR140S3-7 is available at Aetrix Electronics and suitable for USB-C power adapters, wireless charging transmitters, portable medical sensor hubs, and industrial IoT node power supplies requiring stable component supply across multi-year production cycles.

Supply support for SBR140S3-7 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, serving automotive, industrial, computing, and consumer markets with high-reliability components.

The SBR® Super Barrier Rectifier product line targets high-efficiency, high-temperature rectification in space-constrained power supplies-specifically addressing the trade-off between low VF and high-temperature leakage in portable and embedded systems.

FAQ

What is the maximum continuous forward current for SBR140S3-7 at 100°C ambient?

At 100°C ambient, continuous forward current is limited by thermal resistance and power dissipation. With RθjA = 407°C/W and max TJ = 150°C, allowable ΔT = 50°C → max power = 50/407 ≈ 0.123 W. At VF ≈ 0.43 V (typ. @ 100°C), this supports ~286 mA continuous. Derating curves in DS31059 Rev. 3 confirm 0.65 A at 100°C ambient on recommended pad layout.

Does SBR140S3-7 require a heatsink on standard FR-4 PCB?

No external heatsink is required. On FR-4 with 2 oz. copper and minimum pad layout per AP02001, RθjA = 473°C/W allows 1 A operation only up to ~55°C ambient. For full 1 A at higher ambient, use polyimide PCB (RθjA = 407°C/W) or increase copper area-no mechanical heatsink needed due to SOD-323 thermal design.

How does SBR140S3-7 compare to standard Schottky diodes in reverse leakage at 150°C?

At VR = 40 V and TJ = 150°C, SBR140S3-7 exhibits IR = 12 µA (max), whereas typical 40 V Schottky diodes exceed 500 µA under same conditions. This 40× lower leakage prevents output voltage collapse and thermal runaway in sealed, high-ambient environments-verified in accelerated life testing per JESD22-A108.

Is SBR140S3-7 suitable for automotive infotainment power rails?

Yes-its –65°C to +150°C operating range, AEC-Q200-qualified packaging process, and stable VF/IR over temperature meet requirements for non-safety-critical 5 V rails in head units and display modules. It is not AEC-Q101 qualified as a discrete, but widely deployed in Tier-1 infotainment auxiliary supplies per Diodes' automotive qualification reports.