Taiwan Semiconductor Corporation S2A M4G

Overview

S2A M4G from Taiwan Semiconductor is a 2 A, 50 V standard surface-mount silicon rectifier diode in DO-214AA (SMB) package, featuring 1.15 V max forward voltage at 2 A, 50 A surge capability, and 150 °C maximum junction temperature. It serves as a primary AC/DC input rectifier in compact off-line power supplies.

For engineers reviewing the S2A M4G datasheet, S2A M4G pinout, S2A M4G application, or S2A M4G equivalent, key selection criteria include repetitive peak reverse voltage (50 V), forward current rating (2 A), thermal resistance (R_θJA = 53 °C/W), moisture sensitivity level (J-STD-020 Level 1), and RoHS/halogen-free compliance.

Technical Context

The S2A M4G is a single-die, glass-passivated standard recovery rectifier with no integrated soft-recovery or fast-switching optimization. Its 1500 ns reverse recovery time (trr) and 30 pF junction capacitance reflect conventional PN-junction behavior suited for line-frequency and low-kHz switching applications.

Designed for surface-mount assembly, it uses matte tin-plated leads compliant with J-STD-002 solderability and meets JESD201 Class 2 whisker resistance. Polarity is marked by a cathode band on the DO-214AA molded case, which carries UL 94V-0 flammability rating.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount, single-anode/single-cathode configuration. Cathode indicated by molded band. Matte tin-plated leads, UL 94V-0 molding compound, 0.090 g typical weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR220 and VS-2EYH01-M3/5AT, the S2A M4G offers optimal cost-performance balance for non-automotive, non-high-frequency commercial power supplies-retaining standard recovery behavior while meeting J-STD-020 Level 1, RoHS, and halogen-free requirements without qualification overhead.

Availability

S2A M4G is available at Aetrix Electronics and suitable for switching mode power supplies, LED lighting drivers, and AC-DC adapters requiring stable component supply, consistent parametric performance, and full regulatory compliance.

Supply support for S2A M4G 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 power, industrial, and consumer markets since 1979.

The S2A–S2V series was developed as a standardized, high-volume rectifier family targeting cost-sensitive, high-reliability AC/DC front-end applications-emphasizing manufacturability, JEDEC-compliant packaging, and broad regulatory alignment.

FAQ

What is the maximum junction temperature rating for the S2A M4G?

The S2A M4G has a maximum junction temperature (T_J) of +150 °C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet (Version N2102). This rating enables reliable operation in enclosed power supplies and industrial enclosures where ambient temperatures exceed 70 °C. Derating curves confirm zero forward current capability at 150 °C junction temperature, and thermal design must ensure R_θJA × P_LOSS + T_A ≤ 150 °C. The S2A M4G achieves this using glass-passivated die and UL 94V-0 molding.

Is the S2A M4G suitable for use in RoHS-compliant and halogen-free designs?

Yes, the S2A M4G is both RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the Taiwan Semiconductor product documentation (Version N2102). Its matte tin-plated leads, lead-free solder compatibility (J-STD-002), and halogen-free molding compound meet global environmental regulations for consumer, industrial, and medical-adjacent applications. No exemptions or declarations are required-the S2A M4G is fully compliant out-of-the-box, supporting simplified certification workflows for products using the S2A M4G.

What does the "M4G" suffix indicate in S2A M4G?

The "M4G" suffix in S2A M4G is Taiwan Semiconductor's internal date and process code: "M" denotes manufacturing site, "4" indicates year (2024), and "G" specifies week (week 7). It is not a functional variant identifier-electrical and mechanical specifications remain identical to all S2A devices in the DO-214AA package. The base part number S2A defines V_RRM = 50 V, I_F = 2 A, and standard recovery characteristics; the S2A M4G is a production-lot-specific marking of that exact specification.

Does the S2A M4G have a specified reverse recovery time (t_rr)?

Yes, the S2A M4G has a specified reverse recovery time (t_rr) of 1500 ns, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A conditions per the Taiwan Semiconductor datasheet (Version N2102). This value confirms its classification as a standard (not fast or ultrafast) recovery rectifier. Designers should account for this t_rr in EMI filter sizing and snubber design, especially in flyback converters operating above 20 kHz. The S2A M4G's 1500 ns t_rr is consistent across the S2A–S2V family for equivalent voltage grades.

What is the moisture sensitivity level (MSL) of the S2A M4G, and how does it affect handling?

The S2A M4G is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30 °C/60% RH and requires no dry-packaging or baking prior to reflow soldering. This simplifies SMT line integration, eliminates moisture-related popcorning risk, and reduces handling overhead in high-volume manufacturing. The Level 1 rating results from hermetic glass passivation and UL 94V-0 compound encapsulation-key reliability features confirmed in the S2A M4G's mechanical data section.