Taiwan Semiconductor Corporation S3G

Overview

S3G from Taiwan Semiconductor is a 400 V, 3 A surface-mount silicon rectifier diode in DO-214AB (SMC) package, featuring 100 A surge capability, 1.15 V max forward voltage at 3 A, and 10 µA max reverse leakage at 25°C - used in AC/DC front-end rectification for industrial power adapters and LED drivers.

For engineers reviewing the S3G datasheet, S3G pinout, S3G application, or S3G equivalent, key selection criteria include repetitive peak reverse voltage (400 V), thermal resistance (13 °C/W junction-to-lead), reverse recovery time (1500 ns), and RoHS/halogen-free compliance for high-reliability power conversion designs.

Technical Context

The S3G is a single-die, glass-passivated standard recovery rectifier optimized for cost-sensitive, medium-voltage SMPS input stages. Its 400 V V_RRM, 3 A average forward current, and 100 A 8.3 ms surge rating support robust operation under transient line conditions.

Thermal performance is defined by R_θJL = 13 °C/W and R_θJA = 47 °C/W, enabling direct PCB copper pad heatsinking. Reverse recovery time of 1500 ns reflects standard recovery behavior - not fast or ultrafast - making it unsuitable for high-frequency synchronous rectification but appropriate for 50–100 kHz flyback and forward converters.

Key Specifications

Pinout & Package

DO-214AB (SMC) surface-mount package with cathode band marking; molded plastic body per JEDEC DO-214AB, UL 94V-0 rated, matte tin-plated leads, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH3L04S and ES3D, the S3G uniquely balances 400 V rating, DO-214AB compatibility, and standard recovery behavior - making it optimal for cost-driven 230 VAC offline supplies where fast recovery is not required and layout reuse is critical.

Availability

S3G is available at Aetrix Electronics and suitable for industrial power adapters, LED driver input rectification, and AC-DC converters requiring stable component supply across multi-year production cycles.

Supply support for S3G 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 power, automotive, and industrial markets since 1979.

The S3G belongs to TSC's S3x family of surface-mount rectifiers designed specifically for high-volume, cost-optimized AC/DC front-end rectification - emphasizing manufacturability, thermal robustness, and compliance with global environmental standards.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S3G?

The S3G has a maximum repetitive peak reverse voltage (V_RRM) of 400 V, as specified in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version O2301). This rating ensures reliable blocking capability in 230 VAC applications with adequate safety margin. The S3G is part of the S3A–S3M series where 'G' explicitly denotes the 400 V variant, and this value is confirmed across all electrical and mechanical documentation for the S3G.

Is the S3G a fast recovery or standard recovery rectifier?

The S3G is a standard recovery rectifier with a typical reverse recovery time (t_rr) of 1500 ns, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A. It is not classified as fast or ultrafast. This characteristic is documented in the Electrical Specifications section of the S3G datasheet and aligns with its intended use in 50–100 kHz SMPS rather than high-frequency resonant topologies. Designers must account for this t_rr in snubber and EMI filter design.

What package does the S3G use, and is it compatible with automated assembly?

The S3G uses the DO-214AB (SMC) surface-mount package, with matte tin-plated leads solderable per J-STD-002 and moisture sensitivity level 1 per J-STD-020. Its standardized footprint and lead finish make it fully compatible with high-speed pick-and-place equipment and reflow soldering profiles. The S3G's mechanical data confirms suitability for automated placement, and the marking diagram shows cathode band orientation for automated optical inspection.

Does the S3G meet RoHS and halogen-free requirements?

Yes, the S3G is RoHS compliant and halogen-free, as explicitly stated in the FEATURES section of the Taiwan Semiconductor S3A–S3M datasheet (Version O2301). These attributes are verified through material declarations and testing per IEC 61249-2-21 and JEDEC J-STD-020. The S3G carries no restricted substances above threshold limits and is approved for use in EU, China, and South Korea regulatory environments.

What is the thermal resistance from junction to lead (R_θJL) for the S3G?

The S3G has a typical junction-to-lead thermal resistance (R_θJL) of 13 °C/W, as published in the Thermal Performance section of the official datasheet. This value is measured under standard test conditions and enables effective heat transfer to the PCB copper pad. When designing layouts for the S3G, engineers should allocate ≥25 mm² of 2-oz copper connected directly to the cathode/anode pads to realize this thermal performance in practice.