Taiwan Semiconductor Corporation S2DFL

Overview

S2DFL from Taiwan Semiconductor is a 2 A, 200 V standard surface-mount silicon rectifier diode in SOD-123FL package, featuring glass-passivated junction, 40 A surge rating (8.3 ms), and low reverse leakage (≤5 µA at 25°C). It serves as the primary AC-to-DC conversion element in compact DC/DC converters and switching inverters.

For engineers reviewing the S2DFL datasheet, S2DFL pinout, S2DFL application, or S2DFL equivalent, key selection criteria include repetitive peak reverse voltage (200 V), forward voltage (0.97 V max at 2 A/25°C), thermal resistance (R_θJA = 116 °C/W), junction temperature range (–55 to +150 °C), and SOD-123FL mechanical compatibility with automated placement.

Technical Context

The S2DFL is a single-die, unidirectional standard recovery rectifier optimized for general-purpose switching-mode power supplies. Its glass-passivated junction ensures stable reverse characteristics and low IR drift over temperature, while the SOD-123FL package enables high-density PCB layouts with J-STD-002-compliant matte tin leads.

Thermal performance is characterized on a 5 mm × 5 mm copper pad test board: R_θJL = 81 °C/W and R_θJC = 69 °C/W confirm efficient heat transfer to PCB traces and case, supporting continuous 2 A operation up to 125°C ambient when derated per Fig.1.

Key Specifications

Pinout & Package

Package: SOD-123FL - Surface-mount plastic case with cathode band marking, UL 94V-0 molding compound, and matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 1 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MURS220T3G and VS-2EDL02HM3/85A, the S2DFL delivers balanced trade-offs: lower cost than ultrafast alternatives, sufficient surge rating for most industrial converters, and proven reliability in high-humidity environments due to glass passivation and MS Level 1 handling.

Availability

S2DFL is available at Aetrix Electronics and suitable for DC/DC converter output rectification, switching inverter freewheeling, and AC-DC adapter input bridge legs requiring stable component supply, consistent lead-time visibility, and traceable sourcing.

Supply support for S2DFL 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 industrial, computing, and consumer markets since 1979.

The S2DFL belongs to TSC's S2xFL family of standard rectifiers designed specifically for cost-effective, high-reliability AC/DC and DC/DC power conversion in space-constrained surface-mount applications.

FAQ

What is the maximum junction temperature rating for the S2DFL?

The S2DFL has a maximum junction temperature (T_JMAX) of +150 °C, verified per absolute maximum ratings table. This rating enables reliable operation in thermally demanding environments such as enclosed power supplies and motor drive control boards. Derating curves in the S2DFL datasheet specify allowable forward current reduction above 25 °C ambient, ensuring thermal safety margins are maintained throughout the device's lifetime.

Does the S2DFL have a specified reverse recovery time (t_rr)?

No, the S2DFL datasheet does not specify reverse recovery time (t_rr). It is classified as a standard recovery rectifier, with typical t_rr in the microsecond range (~2 µs), unlike ultrafast or fast recovery variants. For applications requiring sub-100 ns t_rr, engineers should consider alternatives like the MURS220T3G. The S2DFL's design prioritizes low leakage and surge robustness over speed.

Is the S2DFL RoHS and halogen-free compliant?

Yes, the S2DFL is RoHS compliant and halogen-free per IEC 61249-2-21. This compliance is explicitly stated in the "Features" section of the official Taiwan Semiconductor datasheet (Version B2103). The device uses halogen-free molding compound and lead-free matte tin plating, meeting global environmental regulations for industrial and consumer electronics.

What is the marking code printed on the S2DFL device body?

The S2DFL is marked with "S2DF" on its top surface, followed by a date code and factory identifier per the "Marking Diagram" in the datasheet. This 4-character prefix distinguishes it from other members of the S2xFL family (e.g., S2GF for 400 V). The marking is laser-etched on the SOD-123FL package and aligns with JEDEC standards for automated optical inspection.

Can the S2DFL replace the S2GFL in a 400 V circuit?

No, the S2DFL must not replace the S2GFL in a 400 V circuit. The S2DFL has a V_RRM of 200 V, while the S2GFL is rated for 400 V. Using the S2DFL in a 400 V application risks catastrophic reverse breakdown and field failure. Always match the device's V_RRM to the peak reverse voltage in the circuit, including safety margins. The S2DFL is strictly intended for ≤200 V applications.