Taiwan Semiconductor Corporation S1K-K

Overview

S1K-K from Taiwan Semiconductor is a 1A, 800V standard surface-mount silicon rectifier diode in DO-214AC (SMA) package, featuring glass passivated junction, low forward voltage drop (max 1.1 V at 1 A), and high surge current capability (30 A, 8.3 ms). It is used in DC-DC converters and switching-mode power supplies where reliable unidirectional conduction and thermal robustness are required.

For engineers reviewing the S1K-K datasheet, S1K-K pinout, S1K-K application, or S1K-K equivalent, key selection criteria include its 800 V repetitive peak reverse voltage, 1500 ns reverse recovery time, junction-to-lead thermal resistance of 30 °C/W, moisture sensitivity level 1 rating, and RoHS/halogen-free compliance for automated SMT assembly.

Technical Context

The S1K-K is a single-die, general-purpose silicon rectifier optimized for medium-voltage switching applications. Its 800 V V_RRM and 560 V V_R(RMS) support operation in 380–480 V AC input stages and high-bus DC-DC front-ends.

Thermal performance is defined by R_θJL = 30 °C/W and R_θJA = 85 °C/W, enabling 1 A continuous conduction with minimal heatsinking on standard FR-4 PCBs. Reverse recovery time of 1500 ns confirms soft-recovery behavior suitable for non-critical switching frequencies below 100 kHz.

Key Specifications

Pinout & Package

Package: DO-214AC (SMA), surface-mount, single-anode/single-cathode configuration. Cathode indicated by molded band. Matte tin-plated leads, J-STD-002 solderable.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1R08 and MUR108, the S1K-K offers optimal balance of cost, manufacturability, and ruggedness for mid-frequency switching applications-its DO-214AC package enables high-volume SMT placement, while its 1500 ns t_rr and 1.1 V V_F deliver predictable loss and thermal behavior without over-engineering.

Availability

S1K-K is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and industrial auxiliary power supplies requiring stable component supply, RoHS-compliant sourcing, and J-STD-020 Level 1 moisture handling.

Supply support for S1K-K 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 S1K-K belongs to TSC's S1x-K standard rectifier family, engineered for cost-sensitive, high-reliability AC/DC and DC/DC conversion in commercial and industrial power systems.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) of the S1K-K?

The S1K-K has a maximum repetitive peak reverse voltage (V_RRM) of 800 V, as specified in the Absolute Maximum Ratings table. This value defines the highest reverse voltage the device can block repeatedly without breakdown under normal operating conditions. The S1K-K is part of the S1D-K to S1M-K series, where the "K" suffix explicitly denotes the 800 V rating. This makes the S1K-K suitable for use in 400 V AC input rectification and 600 V DC bus applications.

Does the S1K-K have a halogen-free and RoHS-compliant construction?

Yes, the S1K-K is both RoHS compliant and halogen-free per IEC 61249-2-21. The device uses a halogen-free molding compound and meets all substance restrictions outlined in the EU RoHS Directive 2011/65/EU. These environmental qualifications are confirmed in the Features section of the official Taiwan Semiconductor datasheet (Version E2102) and apply specifically to the S1K-K variant-not inferred from the family description.

What is the reverse recovery time (t_rr) of the S1K-K, and how does it affect circuit performance?

The S1K-K has a reverse recovery time (t_rr) of 1500 ns under specified test conditions (I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A). This relatively slow recovery characterizes it as a standard (not ultrafast) rectifier, making it appropriate for switching frequencies up to ~50–100 kHz. In practice, this t_rr contributes to moderate switching loss and manageable EMI in flyback and forward converters, but it is not recommended for high-frequency resonant or active-clamp topologies requiring sub-100 ns recovery.

Is the S1K-K suitable for automated SMT assembly, and what is its moisture sensitivity level?

Yes, the S1K-K is designed for automated surface-mount placement and has a moisture sensitivity level (MSL) of Level 1 per J-STD-020. This means it may be stored indefinitely at ≤30°C/60% RH and requires no baking prior to reflow soldering. Its DO-214AC (SMA) package, matte tin-plated leads, and J-STD-002 solderability further ensure compatibility with standard SMT processes-including nitrogen reflow and lead-free profiles.

What thermal resistance values are specified for the S1K-K, and how do they impact PCB layout?

The S1K-K specifies a junction-to-lead thermal resistance (R_θJL) of 30 °C/W and a junction-to-ambient resistance (R_θJA) of 85 °C/W. The low R_θJL indicates efficient heat transfer from die to lead frame, allowing effective conduction cooling via copper pours connected to the cathode/anode pads. For 1 A continuous operation, a minimum 25 mm² copper area per terminal (with internal layers) typically maintains safe junction temperatures without additional heatsinking.