Diodes Incorporated S1MSWFM-7

Overview

S1MSWFM from Diodes Incorporated is a 1.0A surface-mount standard recovery rectifier in SOD123F (Type B) package, rated for 1000V peak repetitive reverse voltage, 1.1V max forward voltage at 1A/25°C, and 10µA max reverse leakage at 1000V/25°C. It serves as a primary AC-DC conversion element in compact power adapters, DC-DC converters, and LED lighting drivers where space-constrained board layout and reliable 1kV blocking are required.

For engineers reviewing the S1MSWFM datasheet, S1MSWFM pinout, S1MSWFM application, or S1MSWFM equivalent, key selection criteria include its 1.0A average forward current at +75°C, 25A non-repetitive surge rating, 1.2µs typical reverse recovery time, thermal resistance of 78°C/W (J-A), and RoHS-compliant matte tin finish on copper leadframe.

Technical Context

This standard recovery rectifier uses glass-passivated silicon die to achieve stable 1000V reverse breakdown with low leakage (<10µA at 1000V/25°C) and controlled forward conduction (VF ≤ 1.1V @ 1A). Its 1.2µs reverse recovery time supports operation in 50–100kHz switching power supplies without excessive switching loss or EMI.

The SOD123F (Type B) package provides a low-profile, automated-assembly-ready footprint with 0.018g mass, UL 94V-0 molded plastic body, and J-STD-020 Level 1 moisture sensitivity-enabling high-yield reflow soldering in consumer and industrial power modules.

Key Specifications

Pinout & Package

Package: SOD123F (Type B), surface-mount, low-profile plastic case with cathode band marking. Dimensions: 2.70mm (E) × 1.80mm (D) × 0.95mm (He) max; weight ≈ 0.018g.

Key Features

Applications

Availability

S1MSWFM is available at Aetrix Electronics and suitable for AC-DC adapters, LED lighting drivers, and industrial DC-DC converters requiring stable component supply, JEDEC-qualified reliability, and RoHS-compliant manufacturing.

Supply support for S1MSWFM 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 ASE, Amkor, and its own facilities.

The S1MSWFM belongs to Diodes' standard recovery rectifier product line, engineered for cost-sensitive, space-constrained general-purpose rectification in consumer and industrial power applications-not automotive or ultra-high-reliability mil/aero.

FAQ

What is the maximum junction temperature for continuous operation?

The S1MSWFM has an operating junction temperature range of –55°C to +150°C. For continuous 1.0A DC operation, thermal design must ensure T_J remains ≤+150°C-achievable with ≤78°C/W R_θJA on standard FR4 and ambient ≤+75°C, per the derating curve in Figure 1.

Is S1MSWFM suitable for automotive applications?

No-S1MSWFM is not AEC-Q200 qualified. Diodes offers automotive-grade equivalents (e.g., S1MSWQFM with Q-suffix) that meet AEC-Q200 stress testing, PPAP capability, and IATF 16949 manufacturing requirements. This part is intended for commercial/industrial use only.

How does its reverse recovery time compare to fast recovery diodes?

At 1.2µs typical, S1MSWFM is classified as a standard recovery rectifier-not fast or ultrafast. Fast recovery diodes (e.g., 1N4937) typically offer t_RR < 500ns. Use S1MSWFM only in ≤100kHz applications; for >200kHz designs, select a fast recovery alternative to avoid switching loss and EMI.

What is the recommended pad layout for SOD123F (Type B)?

Per Diodes' package outline (DS44804 Rev. 3-2), the recommended SOD123F (Type B) pad layout uses G = 1.90mm, X = 1.00mm, X1 = 3.90mm, Y = 1.50mm. Copper traces should follow the 1"×1", 2oz FR4 reference board defined in JEDEC standards to achieve the published R_θJA = 78°C/W.