Taiwan Semiconductor Corporation RS2A M4G

Overview

RS2A M4G from Taiwan Semiconductor is a 2 A, 50 V fast recovery surface-mount rectifier diode in DO-214AA (SMB) package, featuring 150 ns reverse recovery time, 1.3 V max forward voltage at 2 A, and 5 µA max reverse leakage at 25°C - used in compact AC/DC adapters and low-voltage SMPS front-end rectification.

For engineers reviewing the RS2A M4G datasheet, RS2A M4G pinout, RS2A M4G application, or RS2A M4G equivalent, key selection criteria include V_RRM = 50 V, I_F = 2 A continuous, trr = 150 ns, thermal resistance R_θJA = 55 °C/W, and SMB package compatibility with automated SMT assembly.

Technical Context

The RS2A M4G is a single-die, glass-passivated silicon junction rectifier optimized for high-frequency switching operation. Its fast recovery (trr ≤ 150 ns) and low forward voltage (V_F ≤ 1.3 V @ 2 A) reduce conduction and switching losses in 20–500 kHz power converters.

Designed for surface-mount use in space-constrained applications, it meets J-STD-020 moisture sensitivity level 1 and JESD201 Class 2 whisker resistance, with matte tin-plated leads and UL 94V-0 molding compound - enabling reliable reflow soldering without derating.

Key Specifications

Pinout & Package

DO-214AA (SMB) surface-mount package: molded plastic body with cathode band marking; dimensions 4.60 × 3.30 × 2.20 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RS2A M4G, MUR220 offers higher voltage headroom and faster recovery but requires mechanical redesign, while VS-2EYH01-M3/54 provides superior electrical specs in identical SMB packaging - making it the preferred alternative when system V_RRM margin permits.

Availability

RS2A M4G is available at Aetrix Electronics and suitable for AC/DC adapters, low-voltage SMPS, and LED driver designs requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for RS2A 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 and protection markets since 1979.

The RS2A M4G belongs to TSC's RS2x fast recovery rectifier family - engineered specifically for cost-sensitive, high-volume SMT power conversion applications demanding reliability, consistency, and JEDEC-compliant packaging.

FAQ

What is the maximum junction temperature for RS2A M4G?

The RS2A M4G has a maximum junction temperature (T_J) of +175°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet. This rating allows sustained operation in high-ambient environments when mounted on adequate copper area. Derating begins above 75°C ambient, and thermal design must ensure actual T_J remains below 175°C under worst-case load and airflow conditions. The RS2A M4G achieves this via R_θJA = 55 °C/W on standard PCB layout.

Is RS2A M4G suitable for synchronous rectification circuits?

No, RS2A M4G is a passive silicon PN-junction fast recovery diode and cannot function as a synchronous rectifier. Synchronous rectification requires actively controlled MOSFETs with gate drive signals. The RS2A M4G serves only as a freewheeling or output rectifier in non-synchronous topologies like standard flyback or forward converters. Its 150 ns trr and 1.3 V V_F make it appropriate for medium-frequency operation where MOSFET control complexity is avoided.

Does RS2A M4G have a halogen-free and RoHS-compliant construction?

Yes, RS2A M4G is explicitly certified halogen-free and RoHS compliant per Taiwan Semiconductor documentation. The molding compound contains no brominated flame retardants, and lead content is below 1000 ppm. This compliance is confirmed in the "Features" section of the RS2A–RS2M datasheet (Version L2304), supporting environmental compliance for CE, WEEE, and China RoHS-marked products.

What is the reverse recovery time test condition for RS2A M4G?

The reverse recovery time (t_rr) of RS2A M4G is measured under the condition: I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A, per the Electrical Specifications table in the Taiwan Semiconductor RS2A–RS2M datasheet. This standardized test reflects real-world switching behavior in low-current transition phases of flyback and forward converters. The specified t_rr ≤ 150 ns applies only to RS2A and RS2B variants - higher-voltage RS2x parts have progressively longer t_rr.

Can RS2A M4G be used in place of RS2B or RS2D in an existing design?

No - RS2A M4G is rated for 50 V V_RRM, whereas RS2B and RS2D are rated for 100 V and 200 V respectively. Substituting RS2A M4G into a design originally using RS2B or RS2D risks catastrophic failure under reverse voltage stress. The "M4G" suffix denotes the RS2A variant; voltage rating is fixed per part number. Always match V_RRM to the peak reverse voltage present in the circuit - RS2A M4G is only valid where V_RRM ≤ 50 V is guaranteed.