Taiwan Semiconductor Corporation RSFKL

Overview

RSFKL from Taiwan Semiconductor is a 0.5A, 800V fast recovery surface-mount rectifier in Sub SMA package, featuring 500 ns reverse recovery time, 1.3 V max forward voltage at 0.5 A, and 10 A peak surge current - used in high-frequency switching mode power supplies for efficient AC/DC conversion.

For engineers reviewing the RSFKL datasheet, RSFKL pinout, RSFKL application, or RSFKL equivalent, key selection criteria include rated repetitive peak reverse voltage (800 V), thermal resistance (R_θJA = 150 °C/W), junction temperature range (–55 to +150 °C), and moisture sensitivity level (J-STD-020 Level 1).

Technical Context

The RSFKL is a single-die, glass-passivated fast recovery rectifier optimized for high-efficiency DC/DC converters and switching inverters. Its 500 ns trr enables operation at frequencies up to several hundred kHz while maintaining low switching losses.

Thermally, it uses metallurgically bonded construction with R_θJC = 32 °C/W and R_θJA = 150 °C/W, supporting continuous 0.5 A conduction at ambient temperatures up to 75 °C on standard FR-4 PCBs without forced airflow.

Key Specifications

Pinout & Package

Package: Sub SMA - surface-mount, molded epoxy case meeting UL 94V-0; cathode indicated by band; 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 STTH0.5L08 and ES1J, RSFKL offers balanced trade-offs: sufficient 800 V rating for universal AC input, proven 500 ns t_rr for 100–300 kHz converters, and cost-effective Sub SMA packaging - making it optimal for industrial and lighting SMPS where reliability and manufacturability outweigh ultra-fast timing needs.

Availability

RSFKL is available at Aetrix Electronics and suitable for DC/DC converters, industrial switching inverters, and LED driver secondary rectification requiring stable component supply, long-term lifecycle support, and J-STD-020 Level 1 assembly compatibility.

Supply support for RSFKL 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, specializing in rectifiers, TVS diodes, MOSFETs, and bipolar transistors.

The RSF series was developed specifically for high-reliability, high-volume surface-mount power conversion applications - emphasizing thermal robustness, automated placement compatibility, and consistent fast recovery performance across voltage grades.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) of RSFKL?

The RSFKL has a maximum repetitive peak reverse voltage (V_RRM) of 800 V, confirmed in the Absolute Maximum Ratings table of Taiwan Semiconductor's M2103 datasheet. This rating allows RSFKL to safely operate in 400 VAC-input SMPS designs with adequate safety margin and transient headroom. The 800 V value is specific to RSFKL and differs from other variants like RSFAL (50 V) or RSFML (1000 V).

What is the reverse recovery time (t_rr) specification for RSFKL?

The RSFKL exhibits a reverse recovery time (t_rr) of 500 ns under standard test conditions (I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A), as specified in the Electrical Specifications section of the M2103 datasheet. This t_rr value places RSFKL in the "fast recovery" category - distinct from ultra-fast (e.g., <100 ns) or standard recovery rectifiers - and supports stable operation in 100–300 kHz switching power supplies.

Is RSFKL RoHS and halogen-free compliant?

Yes, RSFKL is RoHS compliant per EU Directive 2011/65/EU and halogen-free according to IEC 61249-2-21, as explicitly stated in the FEATURES section of the M2103 datasheet. These compliance attributes are verified for the entire RSF series, including RSFKL, and apply to both die and molding compound. No exemptions or exceptions are noted for this variant.

What is the thermal resistance from junction to ambient (R_θJA) for RSFKL?

The junction-to-ambient thermal resistance (R_θJA) for RSFKL is 150 °C/W, measured under standard JEDEC conditions (single-layer 1 in² copper pad on FR-4). This value is listed in the THERMAL PERFORMANCE section of the M2103 datasheet and applies identically across the RSFAL–RSFML family due to shared Sub SMA package construction and die attachment method.

Does RSFKL have moisture sensitivity level (MSL) rating, and what is it?

Yes, RSFKL has a moisture sensitivity level (MSL) rating of Level 1 per J-STD-020, as documented in the FEATURES section of the M2103 datasheet. This means RSFKL may be stored indefinitely at ≤30°C/60% RH and is compatible with standard lead-free reflow profiles without pre-baking - a critical advantage for high-yield automated SMT lines handling mixed-technology boards.