Taiwan Semiconductor Corporation HS1KAL

Overview

HS1KAL from Taiwan Semiconductor is a 1 A, 800 V high-efficiency surface-mount rectifier diode in a Thin SMA package, featuring 75 ns reverse recovery time, 1.49 V forward voltage at 1 A and 25°C, and 8 pF junction capacitance. It serves as a fast-switching freewheeling or output rectifier in DC-DC converters and switching inverters.

For engineers reviewing the HS1KAL datasheet, HS1KAL pinout, HS1KAL application, or HS1KAL equivalent, key selection criteria include peak reverse voltage rating (800 V), thermal resistance (R_θJL = 29 °C/W), forward voltage vs. temperature behavior, reverse leakage at 125°C (≤35 µA), and compatibility with automated SMT placement on J-STD-002 solderable matte tin leads.

Technical Context

The HS1KAL is a single-die, glass-passivated silicon PN junction rectifier optimized for high-frequency switching power supplies. Its 800 V V_RRM, 75 ns trr, and low 8 pF C_J enable efficient operation in 100–500 kHz SMPS topologies where reverse recovery loss and capacitive switching noise must be minimized.

Thermal design is supported by R_θJL = 29 °C/W and R_θJC = 22 °C/W when mounted on a 5 mm × 5 mm Cu pad, enabling 1 A continuous conduction at T_J ≤ 150°C. The device's moisture sensitivity level 1 (J-STD-020) and halogen-free construction comply with industrial reflow and environmental requirements.

Key Specifications

Pinout & Package

Package: Thin SMA - low-profile, surface-mount package with cathode band polarity marking, JEDEC-standard outline, 0.029 g mass, UL 94V-0 molding compound, and matte tin-plated leads compliant with J-STD-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1R08 and ES1J, the HS1KAL uniquely balances 800 V rating, Thin SMA form factor, and 1.49 V forward drop-making it optimal for space-constrained, medium-voltage industrial DC-DC and inverter designs where thermal path to PCB is primary cooling mechanism.

Availability

HS1KAL is available at Aetrix Electronics and suitable for DC-DC converter output rectification, switching inverter freewheeling, and industrial power supply snubber circuits requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for HS1KAL 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 Taiwanese manufacturer specializing in discrete semiconductors, including rectifiers, TVS diodes, and MOSFETs for industrial and power applications.

The HS1KAL belongs to TSC's HS1xAL high-voltage rectifier family, engineered for efficiency-critical switching power supplies where low profile, fast recovery, and robust thermal performance are required in cost-sensitive volume production.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for HS1KAL?

The HS1KAL has a maximum repetitive peak reverse voltage (V_RRM) of 800 V, as specified in the Absolute Maximum Ratings table. This rating applies under standard conditions (T_A = 25°C) and defines the highest reverse voltage the device can block repeatedly without breakdown. Designers must ensure system-level transients remain within this limit, including safety margins for line surges and ringing in switching circuits. The HS1KAL is part of a family spanning 200–1000 V, with HS1KAL specifically designated for the 800 V grade.

What is the forward voltage (V_F) of HS1KAL at 1 A and 125°C?

The forward voltage of HS1KAL is 1.16 V (typical) and 1.39 V (maximum) at 1 A forward current and 125°C junction temperature, per the Electrical Specifications table. This elevated V_F reflects semiconductor physics-lower bandgap at high temperature reduces built-in potential, but series resistance dominates, resulting in net increase over room-temperature values. These values directly impact conduction loss calculations in thermal design for industrial ambient conditions.

Is HS1KAL compatible with lead-free reflow soldering processes?

Yes, HS1KAL is fully compatible with lead-free reflow soldering. Its matte tin-plated leads meet J-STD-002 solderability requirements, and its moisture sensitivity level is rated at Level 1 per J-STD-020-meaning it has unlimited floor life and requires no pre-bake before standard Pb-free reflow profiles (peak ≤260°C). The UL 94V-0 molding compound also withstands repeated thermal excursions without delamination or cracking.

What is the junction-to-lead thermal resistance (R_θJL) of HS1KAL?

The junction-to-lead thermal resistance (R_θJL) of HS1KAL is 29 °C/W, measured with the device mounted on a 5 mm × 5 mm copper pad per the Thermal Performance section. This parameter quantifies the dominant thermal path from die to PCB copper via the lead frame, making it critical for estimating junction temperature rise in unheatsinked designs. It is significantly lower than R_θJA (51 °C/W), confirming that thermal performance depends heavily on PCB copper area and layout.

Does HS1KAL have a specified reverse recovery time (t_rr)?

Yes, HS1KAL has a specified reverse recovery time (t_rr) of 75 ns maximum, tested at I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. This value is shared with HS1JAL and HS1MAL in the family and is confirmed in the Electrical Specifications table. The 75 ns t_rr enables use in high-frequency switching applications up to ~500 kHz while maintaining acceptable switching loss and EMI performance, distinguishing it from slower general-purpose rectifiers.