Taiwan Semiconductor Corporation S2G-T

Overview

S2G-T from Taiwan Semiconductor is a 2 A, 400 V standard surface-mount silicon rectifier diode in DO-214AA (SMB) package, featuring glass-passivated junction, low reverse leakage (≤5 µA at 25°C), and 50 A surge rating (8.3 ms). It is used in DC-DC converters and switching-mode power supplies where compact size and thermal reliability are required.

For engineers reviewing the S2G-T datasheet, S2G-T pinout, S2G-T application, or S2G-T equivalent, key selection criteria include repetitive peak reverse voltage (400 V), forward voltage drop (0.95 V max at 2 A/25°C), junction-to-lead thermal resistance (20 °C/W), moisture sensitivity level (J-STD-020 Level 1), and RoHS/halogen-free compliance.

Technical Context

The S2G-T is a single-die, unidirectional silicon rectifier optimized for high-efficiency AC/DC and DC/DC conversion. Its glass-passivated junction ensures stable reverse characteristics across temperature, while the DO-214AA (SMB) package supports automated placement and provides 78 °C/W junction-to-ambient thermal resistance on a 10 mm × 10 mm PCB copper pad.

Electrical behavior is defined by rated forward current (2 A continuous), 400 V repetitive peak reverse voltage (V_RRM), and low capacitance (11 pF at 1 MHz, 4 V). Reverse leakage remains ≤300 µA up to 125°C, supporting operation in thermally demanding industrial environments.

Key Specifications

Pinout & Package

DO-214AA (SMB) surface-mount package with cathode-indicating band; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 1 whisker resistance; UL 94V-0 molding compound; weight ≈ 0.090 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH2R04 and SB240-E3/5BT, the S2G-T offers superior surge robustness (50 A vs. 30 A/-) and lower reverse leakage (5 µA vs. 10 µA), making it preferred for industrial-grade power supplies subject to line transients and extended thermal stress.

Availability

S2G-T is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and industrial power supplies requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for S2G-T 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 S2G-T belongs to TSC's S2x-T family of standard rectifiers designed specifically for cost-sensitive, high-volume power conversion applications where reliability, manufacturability, and regulatory compliance are essential.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S2G-T?

The S2G-T 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 C2102). This value defines the highest reverse voltage the device can block repeatedly without breakdown under normal operating conditions. Exceeding 400 V risks irreversible avalanche failure. The S2G-T is part of the S2D-T to S2M-T series, where the letter "G" explicitly denotes the 400 V rating.

Does the S2G-T meet RoHS and halogen-free requirements?

Yes, the S2G-T is RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the FEATURES section of the Taiwan Semiconductor datasheet. The molding compound is UL 94V-0 rated, and terminals are matte tin-plated to meet J-STD-002 solderability standards. These qualifications make the S2G-T suitable for environmentally regulated end equipment including industrial controls and consumer power adapters.

What is the forward voltage drop (V_F) of the S2G-T at 2 A and 25°C?

The forward voltage drop (V_F) of the S2G-T is 0.95 V maximum at 2 A forward current and 25°C junction temperature, per the ELECTRICAL SPECIFICATIONS table. A typical value of 0.90 V is also provided. This V_F directly impacts conduction losses in power stages; for example, at 2 A, worst-case power dissipation is 1.9 W, requiring appropriate thermal design using the stated R_θJL = 20 °C/W.

Is the S2G-T suitable for automated PCB assembly?

Yes, the S2G-T is explicitly designed for automated placement, as noted in its FEATURES list. Its DO-214AA (SMB) package, J-STD-020 Level 1 moisture sensitivity rating, and matte tin-plated leads ensure compatibility with standard SMT reflow processes without pre-baking. The cathode band marking also supports optical recognition during pick-and-place, improving yield in high-volume manufacturing of power supplies and converters.

What is the surge current rating (I_FSM) of the S2G-T, and under what conditions?

The S2G-T has a non-repetitive surge peak forward current (I_FSM) rating of 50 A for a single half-sine wave of 8.3 ms duration, superimposed on rated load, per the Absolute Maximum Ratings table. At 1.0 ms pulse width, the rating increases to 128 A. These values define short-duration overload capability during power-up, fault events, or motor startup - critical for robustness in industrial and motor drive applications.