Diodes Incorporated S1MWFM-7

Overview

S1MWFM from Diodes Incorporated is a 1000V peak repetitive reverse voltage, 1.0A average rectified current, glass passivated surface-mount silicon rectifier diode in the SOD123F (Type B) package. It delivers 1.1V max forward voltage at 1A/25°C, 5µA max reverse leakage at 1000V/25°C, and 30A non-repetitive surge capability-designed for primary-side rectification in compact AC-DC adapters and LED lighting power stages.

For engineers reviewing the S1MWFM datasheet, S1MWFM pinout, S1MWFM application, or S1MWFM equivalent, key selection criteria include verified 1000V V_RRM, thermal resistance of 56°C/W (J-A), reverse recovery time ≤3.0µs, and RoHS-compliant matte tin terminals on copper leadframe-critical for high-voltage, space-constrained, thermally managed rectifier designs.

Technical Context

This device operates as a unidirectional, single-phase, half-wave rectifier with defined derating for capacitive loads (20% current reduction). Its glass passivation ensures stable junction integrity under thermal cycling and humidity exposure, supporting reliable operation from –55°C to +150°C.

The SOD123F (Type B) package enables low-profile PCB mounting with 0.018g mass and UL 94V-0 molded plastic housing. Reverse recovery time (t_RR) is characterized at 1.5–3.0µs using standardized 0.5A/1.0A/0.25A test conditions per Figure 5, confirming suitability for medium-frequency switching applications up to ~100kHz.

Key Specifications

Pinout & Package

Package: SOD123F (Type B), surface-mount, low-profile plastic case with cathode band polarity marking; dimensions: 2.70mm (E) × 1.80mm (D) × 0.85mm (L) max, weight ≈0.018g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS1H100S and ES1J, S1MWFM uniquely balances 1000V isolation, 5µA leakage, and SOD123F form factor-making it optimal for universal-input, space-limited, thermally sensitive AC-DC and LED driver designs where both voltage margin and standby loss matter.

Availability

S1MWFM is available at Aetrix Electronics and suitable for AC-DC adapters, LED lighting drivers, and DC-DC converters requiring stable component supply across industrial, consumer, and automotive-tier production programs.

Supply support for S1MWFM 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 S1MWFM belongs to Diodes' general-purpose rectifier product line, engineered specifically for high-voltage, surface-mount rectification in compact, energy-efficient power conversion systems targeting consumer, industrial, and lighting markets.

FAQ

What is the maximum junction temperature for continuous operation?

The S1MWFM supports continuous operation from –55°C to +150°C junction temperature. Derating begins above +100°C terminal temperature, where average output current drops linearly to zero at +175°C per Figure 1. Thermal design must ensure R_θJA × P_LOSS + T_A stays below 150°C under worst-case ambient and load conditions.

Is S1MWFM qualified for automotive applications?

S1MWFM is not AEC-Q101 qualified. While it meets industrial temperature range (–55°C to +150°C) and RoHS/Green requirements, Diodes explicitly states that automotive-grade parts require separate qualification-including PPAP, IATF 16949 manufacturing, and AEC-Q101 stress testing-which this device does not carry.

How does the SOD123F (Type B) package differ from standard SOD123?

SOD123F (Type B) has tighter dimensional tolerances and optimized leadframe geometry for improved thermal transfer and solder joint reliability. Key differences include reduced height (max 0.85mm vs. 1.1mm), extended cathode pad (He = 3.50mm), and refined mold compound flow control-enabling higher yield in automated reflow processes for high-volume consumer manufacturing.

Can S1MWFM replace 1N4007 in existing designs?

S1MWFM offers identical 1000V V_RRM and 1A I_O ratings but in a 70% smaller SOD123F footprint. However, its 3.0µs t_RR is significantly faster than 1N4007's ~2µs–4µs (unspecified), and its 1.1V V_F is comparable. Replacement is viable if PCB layout accommodates the smaller package and thermal interface is redesigned for surface-mount conduction rather than through-hole leads.