Taiwan Semiconductor Corporation S1AHM2G

Overview

S1AHM2G from Taiwan Semiconductor is a surface-mount silicon rectifier diode rated for 50 V repetitive peak reverse voltage, 1 A average forward current, and 40 A non-repetitive surge current, with a maximum forward voltage of 1.1 V at 1 A and 25°C - used in DC-DC converters and snubber circuits.

For engineers reviewing the S1AHM2G datasheet, S1AHM2G pinout, S1AHM2G application, or S1AHM2G equivalent, key selection considerations include its DO-214AC (SMA) package, glass-passivated junction, moisture sensitivity level 1 rating, RoHS/halogen-free compliance, and thermal resistance of 27°C/W (junction-to-lead).

Technical Context

This device is a single-die, standard recovery rectifier with a typical reverse recovery time of 1500 ns under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A conditions, and exhibits 12 pF junction capacitance at 1 MHz and 4.0 V reverse bias.

Its thermal performance is characterized by a maximum junction temperature of 175°C, junction-to-ambient thermal resistance of 75°C/W, and a cathode-band polarity indicator - all consistent with DO-214AC (SMA) mechanical construction and matte tin-plated leads compliant with J-STD-002 solderability.

Key Specifications

Pinout & Package

Package: DO-214AC (SMA), surface-mount, molded plastic case with matte tin-plated leads; polarity indicated by cathode band; weight ≈ 0.060 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M1A and 1N4001G-E3/54, the S1AHM2G offers superior surge robustness (40 A IFSM) and full SMT compatibility in DO-214AC, making it optimal for volume-manufactured DC-DC and lighting systems requiring J-STD-020 Level 1 handling.

Availability

S1AHM2G is available at Aetrix Electronics and suitable for DC–DC converters, snubber networks, LED lighting drivers, and switching inverters requiring stable component supply, JEDEC-compliant packaging, and halogen-free materials.

Supply support for S1AHM2G 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 and power electronics markets since 1979.

The S1A–S1M series was designed specifically for cost-sensitive, high-volume surface-mount rectification in power conversion stages - balancing efficiency, reliability, and manufacturability in DO-214AC packaging.

FAQ

What is the maximum junction temperature rating for S1AHM2G?

The S1AHM2G has a maximum junction temperature (TJ) rating of +175°C, enabling reliable operation in high-ambient environments such as enclosed LED drivers or industrial power supplies. This rating is validated per TSC's absolute maximum ratings table and aligns with its glass-passivated die construction and UL 94V-0 molding compound. Derating curves in the datasheet confirm usable current capacity down to -55°C storage temperature.

Is S1AHM2G suitable for automated SMT assembly?

Yes, S1AHM2G is explicitly designed for automated placement, as confirmed by its DO-214AC (SMA) package, matte tin-plated leads compliant with J-STD-002, and moisture sensitivity level 1 per J-STD-020 - eliminating pre-bake requirements. Its 0.060 g weight and standardized tape-and-reel packaging (7,500 units per reel) further support high-speed pick-and-place integration in production lines.

Does S1AHM2G meet RoHS and halogen-free standards?

Yes, S1AHM2G is RoHS compliant and halogen-free per IEC 61249-2-21, as stated in the official Taiwan Semiconductor datasheet Version S2102. These certifications apply to both the silicon die and the UL 94V-0 molding compound, supporting compliance for export to EU, China, and other regulated markets without requiring additional material declarations.

What is the reverse recovery time (trr) specification for S1AHM2G?

The S1AHM2G has a typical reverse recovery time (trr) of 1500 ns, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A conditions. This value is specified in the Electrical Specifications table and reflects its standard recovery behavior - appropriate for line-frequency and low-to-mid frequency switching (≤100 kHz), but not optimized for high-frequency synchronous rectification.

How does the thermal resistance of S1AHM2G compare between junction-to-lead and junction-to-ambient?

S1AHM2G has a junction-to-lead thermal resistance (RθJL) of 27°C/W and a junction-to-ambient thermal resistance (RθJA) of 75°C/W, per the Thermal Performance table. This 2.8× difference highlights the importance of copper pad area and thermal vias: effective heatsinking via the lead frame reduces thermal impedance significantly, while ambient convection alone limits power dissipation to ~1.3 W at 75°C ambient rise.