Taiwan Semiconductor Corporation S1GFS

Overview

S1GFS from Taiwan Semiconductor is a 1A, 400V standard surface-mount silicon rectifier diode in SOD-128 package, featuring glass-passivated junction, 30A surge capability, and 150°C max junction temperature - used in DC-DC converters and switching-mode inverters.

For engineers reviewing the S1GFS datasheet, S1GFS pinout, S1GFS application, or S1GFS equivalent, key selection factors include its 400V repetitive peak reverse voltage, 1.1V max forward voltage at 1A/25°C, moisture sensitivity level 1 rating, RoHS/halogen-free compliance, and SOD-128 thermal performance (R_θJL = 29°C/W).

Technical Context

The S1GFS is a single-die, unidirectional silicon PN junction rectifier optimized for high-reliability surface-mount power conversion. Its glass-passivated chip junction ensures stable reverse leakage (<1µA @ 25°C, <50µA @ 125°C) and robust surge tolerance (30A I_FSM, 8.3ms half-sine).

Thermally, it delivers R_θJL = 29°C/W and R_θJA = 82°C/W when mounted on a 5mm × 5mm Cu pad PCB - enabling continuous 1A conduction without active cooling in ambient temperatures up to 75°C.

Key Specifications

Pinout & Package

Package: SOD-128 - surface-mount, flat-lead, molded plastic case with cathode band polarity marking; UL 94V-0 rated, matte tin-plated leads, JESD201 Class 2 whisker resistant, 0.027g weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR140 and VS-1EWH04-M3, the S1GFS provides superior thermal dissipation (R_θJL = 29°C/W), lower forward voltage, and moisture level 1 compatibility - making it preferred for cost-sensitive, thermally demanding industrial DC-DC and inverter applications.

Availability

S1GFS is available at Aetrix Electronics and suitable for DC-DC converter output stages, switching inverter freewheeling paths, and industrial sensor power rectification requiring stable component supply and long-lifecycle support.

Supply support for S1GFS 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 industrial, computing, and consumer markets since 1979.

The S1GFS belongs to TSC's S1xFS standard rectifier family - designed specifically for high-yield, high-reliability surface-mount power conversion in cost-sensitive industrial and telecom infrastructure applications.

FAQ

What is the maximum repetitive peak reverse voltage rating for the S1GFS?

The S1GFS has a maximum repetitive peak reverse voltage (V_RRM) of 400 V, as specified in the absolute maximum ratings table. This rating defines the highest reverse-biased voltage the device can block continuously without breakdown. It is validated per JEDEC test conditions and applies across the full operating temperature range (−55°C to +150°C). The S1GFS must not be operated above this voltage in any design using the S1GFS.

Does the S1GFS require pre-baking before reflow soldering?

No, the S1GFS does not require pre-baking before reflow soldering because it is rated at moisture sensitivity level (MSL) 1 per J-STD-020. This means the device can be stored indefinitely at ≤30°C/60% RH and placed directly into standard lead-free reflow profiles without baking. This simplifies manufacturing flow and reduces risk of moisture-induced popcorning during the S1GFS assembly process.

What is the forward voltage drop of the S1GFS at 1A and 25°C?

The forward voltage drop (V_F) of the S1GFS is guaranteed to be ≤1.1 V at 1A forward current and 25°C junction temperature, with a typical value of 0.99 V. This parameter is measured under pulsed conditions (PW = 0.3 ms) to avoid self-heating. At elevated temperatures (e.g., 125°C), V_F decreases to ≤0.95 V, improving conduction efficiency in thermally stressed S1GFS applications.

Is the S1GFS RoHS and halogen-free compliant?

Yes, the S1GFS is fully RoHS compliant and halogen-free in accordance with IEC 61249-2-21. All materials used in the S1GFS package molding compound, lead finish (matte tin), and internal construction meet these environmental standards. Documentation of compliance is provided in Taiwan Semiconductor's official product declaration for the S1GFS, supporting global market access and green procurement requirements.

What is the thermal resistance from junction to lead (R_θJL) for the S1GFS?

The junction-to-lead thermal resistance (R_θJL) of the S1GFS is 29°C/W, measured with the device mounted on a standard 5 mm × 5 mm copper pad PCB per JEDEC 51-14. This low value reflects efficient heat transfer from the die through the leads into the PCB, allowing the S1GFS to sustain 1A continuous current with minimal temperature rise - a key advantage over smaller-package alternatives like SOD-123.