Taiwan Semiconductor Corporation S2GALH

Overview

S2GALH from Taiwan Semiconductor is a 2 A, 400 V standard surface-mount silicon rectifier diode in a Thin SMA package, featuring glass-passivated junction, AEC-Q101 qualification, and 50 A surge capability (8.3 ms). It serves as a freewheeling or snubber diode in automotive DC/DC converters where compact size and thermal reliability are critical.

For engineers reviewing the S2GALH datasheet, S2GALH pinout, S2GALH application, or S2GALH equivalent, key selection criteria include its 400 V repetitive peak reverse voltage, 0.98 V forward voltage at 2 A/25°C, 14 °C/W junction-to-lead thermal resistance, AEC-Q101 qualification, and Thin SMA package compatibility with automated placement.

Technical Context

The S2GALH is a single-die, unidirectional standard recovery rectifier optimized for moderate-frequency switching applications up to ~100 kHz. Its glass-passivated junction ensures stable reverse leakage (<1 µA at 25°C) and robustness against humidity and mechanical stress.

Thermal performance is defined for mounting on a 5 mm × 5 mm copper pad: R_θJL = 14 °C/W enables efficient heat transfer to PCB leads, while R_θJA = 74 °C/W reflects ambient-limited dissipation in still air - critical for under-hood automotive environments.

Key Specifications

Pinout & Package

Package: Thin SMA (Surface Mount Axial), low-profile, moisture-sensitivity level 1 per J-STD-020, matte tin-plated leads, cathode indicated by band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS2H100S and SB240-E3/54, the S2GALH uniquely combines 400 V rating, AEC-Q101 qualification, and glass-passivated junction stability - making it the only option among the three validated for automotive under-hood freewheeling and snubbing where reliability trumps marginal V_F reduction.

Availability

S2GALH is available at Aetrix Electronics and suitable for automotive DC/DC converters, snubber networks, and freewheeling circuits requiring stable component supply, AEC-Q101 compliance, and consistent Thin SMA packaging.

Supply support for S2GALH 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, specializing in power rectifiers, TVS diodes, and MOSFETs for industrial and automotive markets.

The S2GALH belongs to TSC's S2xALH family of AEC-Q101-qualified standard rectifiers designed specifically for high-reliability automotive power conversion and protection - emphasizing thermal robustness, moisture resilience, and automated manufacturability.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S2GALH?

The S2GALH has a V_RRM of 400 V, meaning it reliably blocks up to 400 V of reverse voltage in repetitive operation. This rating is confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version B2103) and defines the upper limit for safe reverse-bias operation in applications like snubbers and freewheeling paths. Exceeding this voltage risks avalanche breakdown or permanent damage to the S2GALH.

Is the S2GALH suitable for automotive applications?

Yes, the S2GALH is explicitly AEC-Q101 qualified, meeting rigorous stress tests for temperature cycling, high-temperature reverse bias, and mechanical shock required for automotive under-hood and chassis-mounted electronics. Its 150°C maximum junction temperature, glass-passivated junction, and moisture-sensitivity level 1 make the S2GALH appropriate for engine control units, DC/DC converters, and solenoid drivers in passenger vehicles and commercial fleets.

What is the forward voltage (V_F) of the S2GALH at rated current?

The S2GALH exhibits a maximum forward voltage of 0.98 V at 2 A and 25°C, per the Electrical Specifications table. At elevated temperatures (125°C), V_F drops to 0.88 V max due to semiconductor physics - an important detail for thermal design. This V_F directly determines conduction losses in the S2GALH, especially in high-duty-cycle freewheeling applications.

Does the S2GALH have a specified junction-to-lead thermal resistance?

Yes, the S2GALH has a typical junction-to-lead thermal resistance (R_θJL) of 14 °C/W, measured with the device mounted on a 5 mm × 5 mm copper pad. This parameter is critical for estimating junction temperature rise when heat is conducted primarily through the leads into the PCB - a common layout approach for Thin SMA devices. The value is documented in the Thermal Performance section of the S2GALH datasheet.

What package type does the S2GALH use, and what are its key mechanical attributes?

The S2GALH uses the Thin SMA package: a low-profile surface-mount axial outline with matte tin-plated leads, cathode polarity marked by a band, and weight of approximately 0.029 g. It meets UL 94V-0 flammability, JESD201 Class 2 whisker resistance, and J-STD-020 Level 1 moisture sensitivity - confirming suitability for lead-free reflow and high-volume automated assembly without baking.