Taiwan Semiconductor Corporation S1GAL

Overview

S1GAL from Taiwan Semiconductor is a 1 A, 400 V standard surface-mount silicon rectifier diode in a Thin SMA package, featuring glass-passivated junction, 30 A surge rating, and 150 °C maximum junction temperature; used in DC-DC converters and switching-mode power supplies.

For engineers reviewing the S1GAL datasheet, S1GAL pinout, S1GAL application, or S1GAL equivalent, key selection criteria include repetitive peak reverse voltage (400 V), forward voltage at 1 A (≤1.10 V), reverse leakage at 125 °C (≤50 µA), thermal resistance (R_θJL = 29 °C/W), and RoHS/halogen-free compliance.

Technical Context

The S1GAL operates as a single-die, unidirectional, standard recovery rectifier with a cathode-band polarity indicator. Its glass-passivated junction ensures stable performance under thermal cycling and humidity exposure, while the Thin SMA package supports automated placement and meets J-STD-020 Level 1 moisture sensitivity.

Thermal performance is characterized with R_θJL = 29 °C/W and R_θJA = 82 °C/W on a 5 mm × 5 mm copper pad PCB. Electrical behavior includes VF ≤ 0.96 V at 1 A/25 °C and IR ≤ 1 µA at 25 °C, with junction capacitance of 8 pF at 4 V reverse bias.

Key Specifications

Pinout & Package

Package: Thin SMA - Surface-mount, low-profile, single-anode/single-cathode configuration with cathode band marking; lead finish is pure tin, compliant with J-STD-002 solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR140 and VS-1N4007-M3/54, the S1GAL delivers optimal balance of cost, thermal performance (R_θJL = 29 °C/W), and regulatory compliance in surface-mount power conversion-without ultrafast timing overhead or through-hole layout constraints.

Availability

S1GAL is available at Aetrix Electronics and suitable for DC–DC converters, switching mode inverters, and industrial power supplies requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.

Supply support for S1GAL 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 S1GAL belongs to TSC's S1xAL standard rectifier family, designed specifically for cost-effective, high-reliability surface-mount AC/DC and DC/DC power conversion in space-constrained and thermally demanding applications.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S1GAL?

The S1GAL 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 B2103). This rating defines the highest reverse voltage the S1GAL can block repeatedly without breakdown under normal operating conditions and is validated across temperature and surge conditions per JEDEC standards.

Does the S1GAL support automated SMT assembly?

Yes, the S1GAL supports automated surface-mount assembly. Its Thin SMA package complies with J-STD-020 moisture sensitivity level 1, features pure tin-plated leads solderable per J-STD-002, and is optimized for pick-and-place and reflow processes. The low-profile form factor and cathode-band polarity marking further enhance placement accuracy and process yield in high-volume manufacturing.

What is the forward voltage (V_F) of the S1GAL at 1 A and 25 °C?

The forward voltage (V_F) of the S1GAL is guaranteed ≤1.10 V at 1 A and 25 °C, with a typical value of 0.96 V, per the Electrical Specifications table. This parameter directly impacts conduction losses and thermal design; measured under pulse conditions (PW = 0.3 ms), it reflects real-world performance in switching power supplies where average current is sustained but instantaneous dissipation is pulsed.

Is the S1GAL RoHS and halogen-free compliant?

Yes, the S1GAL is both RoHS compliant and halogen-free in accordance with IEC 61249-2-21. Taiwan Semiconductor explicitly states this in the FEATURES section of the datasheet (Version B2103), confirming that the molding compound, plating, and overall construction meet environmental regulatory requirements for global electronics manufacturing and end-of-life handling.

What is the junction-to-lead thermal resistance (R_θJL) of the S1GAL?

The junction-to-lead thermal resistance (R_θJL) of the S1GAL is 29 °C/W, measured on a standard 5 mm × 5 mm copper pad PCB per JEDEC test conditions. This value is critical for estimating temperature rise from junction to PCB copper and informs heatsinking decisions-especially in sealed enclosures or high-ambient-temperature deployments where the S1GAL operates near its 150 °C T_J limit.