Taiwan Semiconductor Corporation S2KFS M3G

Overview

S2KFS M3G from Taiwan Semiconductor is a 2 A, 800 V standard surface-mount silicon rectifier diode in SOD-128 package, featuring glass-passivated junction, 50 A surge rating (8.3 ms), and 150 °C max junction temperature; used in DC-DC converters and switching-mode inverters.

For engineers reviewing the S2KFS M3G datasheet, S2KFS M3G pinout, S2KFS M3G application, or S2KFS M3G equivalent, key selection criteria include repetitive peak reverse voltage (800 V), forward voltage at 2 A (≤1.10 V @ 25°C), thermal resistance (R_θJL = 14 °C/W), moisture sensitivity level (MSL 1), and RoHS/halogen-free compliance.

Technical Context

The S2KFS M3G is a single-die, unidirectional standard recovery rectifier optimized for medium-voltage switching power supplies. Its glass-passivated junction ensures stable reverse leakage (<1 µA @ 25°C) and robustness against humidity and thermal cycling.

Thermal performance is defined with mounting on a 5 mm × 5 mm copper pad: R_θJA = 74 °C/W (ambient), R_θJC = 20 °C/W (case), enabling reliable 2 A continuous operation up to 125°C ambient when properly heatsinked.

Key Specifications

Pinout & Package

Package: SOD-128 - surface-mount, molded plastic case with matte tin-plated leads, UL 94V-0 rated, polarity indicated by cathode band, weight ≈ 0.027 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH2R08 and ES2D-E3/57T, the S2KFS M3G uniquely balances 800 V capability, SOD-128 compactness, and MSL 1 manufacturability-making it optimal for space-constrained, high-reliability industrial SMPS where voltage headroom and assembly yield are critical.

Availability

S2KFS M3G is available at Aetrix Electronics and suitable for DC-DC converters, switching-mode inverters, and industrial HVDC power supplies requiring stable component supply, consistent parametric performance, and full RoHS/halogen-free compliance.

Supply support for S2KFS M3G 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, computing, and consumer markets since 1979.

The S2KFS M3G belongs to TSC's S2DFS–S2MFS standard rectifier family, engineered for cost-effective, high-yield surface-mount power conversion in mainstream switching power supplies and motor drives.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S2KFS M3G?

The S2KFS M3G has a maximum repetitive peak reverse voltage (V_RRM) of 800 V, as confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version B2103). This rating defines its safe blocking capability in AC line rectification and DC link applications where transient overvoltages may occur. The S2KFS M3G must not be subjected to reverse voltages exceeding this value under normal operating conditions.

Is the S2KFS M3G suitable for automated SMT assembly without pre-baking?

Yes, the S2KFS M3G is rated Moisture Sensitivity Level (MSL) 1 per J-STD-020, meaning it has unlimited floor life and can be placed directly into reflow soldering without prior baking. This is enabled by its hermetically molded SOD-128 package and internal construction. The S2KFS M3G is therefore ideal for high-throughput automated assembly lines handling industrial power modules and server PSUs.

What is the forward voltage (V_F) of the S2KFS M3G at 2 A and 25°C?

The forward voltage (V_F) of the S2KFS M3G is specified as a maximum of 1.10 V at 2 A and 25°C, with a typical value of 0.98 V under the same conditions. This parameter is measured using a pulse test (PW = 0.3 ms) and directly impacts conduction losses in power stages. At elevated temperatures (e.g., 125°C), V_F drops to ≤0.98 V, improving efficiency in thermally stressed designs containing the S2KFS M3G.

Does the S2KFS M3G have halogen-free and RoHS-compliant construction?

Yes, the S2KFS M3G meets both RoHS Directive 2011/65/EU requirements and is halogen-free per IEC 61249-2-21. These compliance attributes are explicitly stated in the FEATURES section of the Taiwan Semiconductor datasheet. The S2KFS M3G is therefore qualified for use in environmentally regulated markets including the EU, Japan, and North America, and supports green manufacturing initiatives.

What is the thermal resistance from junction to lead (R_θJL) for the S2KFS M3G?

The junction-to-lead thermal resistance (R_θJL) of the S2KFS M3G is 14 °C/W, measured with the device mounted on a 5 mm × 5 mm copper pad per JEDEC standards. This low value reflects efficient heat transfer from the silicon die to the PCB via the cathode lead, making the S2KFS M3G well-suited for thermally dense layouts where active heatsinking is impractical. Thermal design using the S2KFS M3G should reference this value-not R_θJA-for pad-based cooling analysis.