Taiwan Semiconductor Corporation RS2DFS

Overview

RS2DFS from Taiwan Semiconductor is a 2 A, 200 V fast recovery surface-mount rectifier in SOD-128 package, featuring 150 ns reverse recovery time, 1.01 V forward voltage at 2 A/25°C, and 175°C maximum junction temperature. It serves as a primary output rectifier in DC-DC converters requiring low conduction loss and high thermal robustness.

For engineers reviewing the RS2DFS datasheet, RS2DFS pinout, RS2DFS application, or RS2DFS equivalent, key selection criteria include its 200 V repetitive peak reverse voltage, 50 A surge current rating, glass-passivated junction for reliability, and compatibility with automated SMT assembly on standard PCB pads.

Technical Context

The RS2DFS is a single-die, unidirectional silicon rectifier optimized for high-frequency switching power supplies. Its fast recovery (trr ≤ 150 ns) and low forward voltage (VF = 1.01 V @ 2 A, 25°C) reduce switching and conduction losses simultaneously.

Thermal performance is defined by R_θJL = 16°C/W and R_θJA = 73°C/W on a 5 mm × 5 mm Cu pad, enabling sustained 2 A operation without forced cooling in compact industrial and telecom power modules.

Key Specifications

Pinout & Package

Package: SOD-128 - Low-profile, surface-mount plastic package with matte tin-plated leads (J-STD-002 compliant), moisture sensitivity level 1, UL 94V-0 rated molding compound, cathode indicated by band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH2R02 and MBR220LSFT1G, the RS2DFS delivers optimal balance of 200 V blocking, 150 ns recovery, and 175°C thermal capability in a thermally robust SOD-128 package-making it the preferred choice for industrial 24–48 V DC-DC and auxiliary supply designs where reliability under thermal stress is prioritized.

Availability

RS2DFS is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and general-purpose industrial power supplies requiring stable component supply, long-lifecycle support, and J-STD-020 Level 1 moisture handling.

Supply support for RS2DFS 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 RS2DFS belongs to TSC's RS2xFS fast recovery rectifier family, engineered specifically for high-efficiency, high-reliability AC-DC and isolated DC-DC power conversion in space-constrained industrial and telecom equipment.

FAQ

What is the maximum junction temperature rating for RS2DFS?

The RS2DFS has a maximum junction temperature (T_J(max)) of +175°C, verified per absolute maximum ratings table in the official TSC datasheet revision C2304. This rating allows continuous operation in high-ambient environments such as enclosed motor drives or sealed telecom power supplies. Derating curves confirm 2 A current remains viable up to 125°C ambient when mounted on a 5 mm × 5 mm copper pad. The RS2DFS must not be operated beyond this thermal limit to ensure long-term reliability.

Does RS2DFS have a specified reverse recovery time (t_rr)?

Yes, the RS2DFS has a maximum reverse recovery time (t_rr) of 150 ns, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A conditions at TA = 25°C. This value is explicitly listed in the Electrical Specifications table for the RS2DFS variant in the TSC datasheet. The 150 ns t_rr enables efficient operation in switching power supplies operating up to 500 kHz without excessive switching loss or EMI generation. The RS2DFS t_rr is slower than ultrafast variants like RS2GFS (150 ns same) but faster than higher-voltage members (e.g., RS2MFS = 500 ns).

What is the forward voltage (V_F) of RS2DFS at full rated current?

The RS2DFS exhibits a typical forward voltage (V_F) of 1.01 V at 2.0 A and 25°C, as confirmed in the Electrical Specifications table. At elevated temperature (125°C), V_F drops to 0.88 V under the same 2 A condition-consistent with silicon diode behavior. This 1.01 V value is measured using pulse testing (PW = 0.3 ms) to avoid self-heating artifacts. Designers should use this figure for conduction loss calculation in thermal modeling of 24 V or 48 V output DC-DC converters where the RS2DFS serves as the output rectifier.

Which package does RS2DFS use, and what are its key mechanical features?

The RS2DFS uses the SOD-128 surface-mount package, defined per JEDEC DO-221AD. Key mechanical features include matte tin-plated leads compliant with J-STD-002, UL 94V-0 flammability-rated molding compound, cathode polarity indicated by a visible band, and moisture sensitivity level 1 (MSL-1) per J-STD-020. Its dimensions are 4.40 × 2.30 × 1.20 mm (L × W × H), with a 5 mm × 5 mm recommended copper pad for thermal management. The RS2DFS weight is approximately 0.027 g.

Is RS2DFS RoHS and halogen-free compliant?

Yes, the RS2DFS is fully RoHS compliant and halogen-free, as stated in the Features section of the TSC datasheet revision C2304. Compliance is verified per EU Directive 2011/65/EU and IEC 61249-2-21:2011. The device contains no brominated flame retardants (BFRs), no chlorine-based flame retardants (CFRs), and total halogen content is below 900 ppm chlorine and 900 ppm bromine. This makes the RS2DFS suitable for export to EU, Japan, and other regulated markets requiring strict environmental material declarations.