Taiwan Semiconductor Corporation S2AHM4G

Overview

S2AHM4G from Taiwan Semiconductor is a 2 A, 400 V repetitive peak reverse voltage (V_RRM) standard surface-mount silicon rectifier diode in DO-214AA (SMB) package, featuring glass-passivated junction, low forward voltage drop (≤1.15 V at 2 A), and high surge current capability (50 A I_FSM). It is used in AC/DC front-end rectification for compact switching mode power supplies.

For engineers reviewing the S2AHM4G datasheet, S2AHM4G pinout, S2AHM4G application, or S2AHM4G equivalent, key selection criteria include its 400 V V_RRM, 2 A average forward current rating, 1500 ns reverse recovery time, thermal resistance (R_θJA = 53 °C/W), and SMB package compatibility with automated placement.

Technical Context

This device is a single-die, unidirectional standard recovery rectifier optimized for cost-sensitive, medium-voltage DC power conversion. Its 1500 ns reverse recovery time and 30 pF junction capacitance reflect trade-offs favoring low conduction loss over ultra-fast switching performance.

The DO-214AA (SMB) package provides robust thermal dissipation (R_θJL = 16 °C/W) and meets UL 94V-0 flammability, J-STD-020 Level 1 moisture sensitivity, and JESD 201 Class 2 whisker resistance - enabling reliable reflow soldering in industrial and consumer production.

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 JESD 201 Class 2 whisker resistance. Weight: 0.090 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH2R04 and MUR240, the S2AHM4G prioritizes low-cost, low-V_F rectification in SMB footprint at ≤100 kHz - offering optimal balance of efficiency, thermal management, and manufacturability for mainstream AC/DC converters.

Availability

S2AHM4G is available at Aetrix Electronics and suitable for switching mode power supplies, LED lighting drivers, and industrial DC-DC converter front-ends requiring stable component supply, tape-and-reel packaging (3,000 pcs/reel), and consistent DO-214AA mechanical form factor.

Supply support for S2AHM4G 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 S2A–S2V series was designed specifically for high-volume, cost-optimized AC/DC rectification in space-constrained surface-mount applications - emphasizing reliability, automated assembly compatibility, and regulatory compliance (RoHS, halogen-free, UL).

FAQ

What is the maximum junction temperature rating for S2AHM4G?

The S2AHM4G has a maximum junction temperature (T_J) rating of +150°C, with an operational storage temperature range of −55°C to +150°C. This allows use in high-ambient environments such as enclosed LED drivers or industrial power supplies where internal temperatures may exceed 85°C. Derating curves in the datasheet specify reduced I_F above 75°C ambient.

Does S2AHM4G support lead-free reflow soldering?

Yes, the S2AHM4G supports lead-free reflow soldering per J-STD-002. Its matte tin-plated leads and Level 1 moisture sensitivity (per J-STD-020) eliminate pre-bake requirements and ensure compatibility with standard Pb-free reflow profiles (peak 260°C). The UL 94V-0 molding compound also withstands repeated thermal excursions.

What is the reverse recovery time (t_rr) of S2AHM4G and how does it affect circuit design?

The S2AHM4G has a reverse recovery time (t_rr) of 1500 ns under specified test conditions (I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A). This standard recovery speed makes it appropriate for switching frequencies up to 100 kHz. At higher frequencies, increased switching loss and EMI may occur - so designers should verify waveform integrity and thermal rise in final layout.

Is S2AHM4G pin-compatible with other devices in the S2x family?

Yes, all S2x devices including S2AHM4G share identical DO-214AA (SMB) package dimensions, pinout, and thermal characteristics. Only the V_RRM rating differs across the series (e.g., S2A = 50 V, S2B = 100 V, ..., S2G = 400 V). This enables design reuse and BOM flexibility without layout changes when adjusting voltage margin.

What marking code appears on the S2AHM4G device body?

The S2AHM4G is marked with "S2G" on the device body, consistent with Taiwan Semiconductor's ordering convention where the letter suffix denotes V_RRM (G = 400 V). Additional markings include green compound indicator (G), date code (YW), and factory code (F), as shown in the official package outline diagram.