Taiwan Semiconductor Corporation HS2KFL

Overview

HS2KFL from Taiwan Semiconductor is a 2 A, 800 V high-efficiency surface-mount silicon rectifier diode in SOD-123FL package, featuring low reverse leakage (≤5 µA at 25°C), fast recovery time (75 ns), and 1.42 V forward voltage at 2 A/25°C. It serves as a freewheeling or output rectifier in DC-DC converters and switching inverters operating up to 150°C junction temperature.

For engineers reviewing the HS2KFL datasheet, HS2KFL pinout, HS2KFL application, or HS2KFL equivalent, key selection criteria include its 800 V repetitive peak reverse voltage, thermal resistance (R_θJA = 116 °C/W), junction capacitance (10 pF), and compatibility with automated placement on PCBs using J-STD-002 solderable matte tin leads.

Technical Context

The HS2KFL is a single-die, glass-passivated PN-junction rectifier optimized for high-voltage switching-mode power supplies. Its 75 ns reverse recovery time and 10 pF junction capacitance at 1 MHz/4 V support efficient operation in 100–500 kHz converters without excessive switching loss or EMI generation.

Rated for continuous forward current of 2 A and surge capability of 40 A (8.3 ms) or 100 A (1.0 ms), the device operates across –55°C to +150°C ambient and junction temperatures, with polarity indicated by cathode band and moisture sensitivity level 1 per J-STD-020.

Key Specifications

Pinout & Package

Package: SOD-123FL - surface-mount plastic case with matte tin-plated leads, UL 94V-0 molding compound, and cathode band polarity marking. Weight: 0.016 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage rectifier applications.

Compared with STTH2R08 and MUR280, the HS2KFL offers identical voltage/current ratings and recovery speed in an SMD package with the lowest forward voltage among the three-directly reducing power loss and PCB temperature rise in high-density power modules.

Availability

HS2KFL is available at Aetrix Electronics and suitable for industrial DC-DC converters, automotive LED drivers, and renewable energy inverters requiring stable component supply, RoHS-compliant sourcing, and SOD-123FL footprint consistency.

Supply support for HS2KFL 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 power rectifiers, TVS diodes, and MOSFETs for industrial and consumer markets.

The HS2KFL belongs to TSC's HS2xFL high-voltage rectifier family, engineered for efficiency-critical switching power supplies where low V_F, fast t_rr, and robust thermal performance are required in compact SMD form.

FAQ

What is the maximum junction temperature rating for HS2KFL?

The HS2KFL has a maximum junction temperature (T_JMAX) of +150°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet revision B2103. This rating applies under continuous forward current conditions with appropriate PCB thermal management-specifically a 5 mm × 5 mm copper pad-to maintain safe operation in enclosed or high-ambient environments. The HS2KFL must not exceed this limit during transient or steady-state operation.

Does HS2KFL have a specified reverse recovery time, and how is it measured?

Yes, the HS2KFL has a reverse recovery time (t_rr) of 75 ns maximum, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A per the official datasheet. This value is confirmed for all variants from HS2JFL through HS2MFL, including HS2KFL. The measurement uses standardized pulse test waveforms and reflects real-world switching behavior in high-frequency DC-DC converters where fast recovery minimizes switching loss and EMI.

What is the forward voltage of HS2KFL at 2 A and 125°C junction temperature?

The forward voltage (V_F) of HS2KFL is 1.24 V typical and 1.50 V maximum at 2 A forward current and 125°C junction temperature, as specified in the Electrical Specifications table of the Taiwan Semiconductor datasheet. This elevated V_F reflects reduced semiconductor resistivity at high temperature and is critical for thermal design validation-ensuring that total power dissipation (I_F × V_F) remains within the 116 °C/W R_θJA thermal limit on the target PCB layout.

Is HS2KFL compatible with lead-free reflow soldering processes?

Yes, HS2KFL is fully compatible with lead-free reflow soldering. Its matte tin-plated leads meet J-STD-002 solderability requirements, and its SOD-123FL package is rated for moisture sensitivity level 1 per J-STD-020-meaning no pre-bake is required prior to reflow. The device supports peak reflow temperatures up to 260°C for ≤10 seconds, aligning with IPC/JEDEC J-STD-020D.3 specifications for Pb-free assembly.

How does the junction capacitance of HS2KFL affect high-frequency circuit performance?

The HS2KFL exhibits a junction capacitance (C_J) of 10 pF at 1 MHz and 4 V reverse bias, which directly influences high-frequency switching noise and snubber design. At 500 kHz operation, this capacitance contributes ~32 kΩ capacitive reactance, minimizing displacement current and EMI coupling into adjacent traces. Lower C_J versus lower-voltage variants (e.g., HS2DFL at 21 pF) makes HS2KFL especially suitable for high-speed flyback and resonant converters where parasitic capacitance must be tightly controlled-confirming its role in the HS2KFL's system-level timing and signal integrity behavior.