Taiwan Semiconductor Corporation S1K

Overview

S1K from Taiwan Semiconductor is a 1 A, 800 V surface-mount silicon rectifier diode in DO-214AC (SMA) package, featuring 1.1 V max forward voltage at 1 A, 1 µA max reverse leakage at 25°C, and 1500 ns reverse recovery time - used in snubber networks and DC-DC converter output stages.

For engineers reviewing the S1K datasheet, S1K pinout, S1K application, or S1K equivalent, key selection criteria include peak reverse voltage rating (800 V), thermal resistance (30 °C/W junction-to-lead), surge current capability (30 A @ 8.3 ms), and RoHS/halogen-free compliance for industrial power conversion designs.

Technical Context

The S1K is a single-die, glass-passivated standard recovery rectifier optimized for general-purpose and switching-mode power supply applications. Its 800 V V_RRM, 30 A I_FSM, and 1500 ns t_rr reflect trade-offs between voltage robustness and switching speed - suitable for non-high-frequency rectification where low conduction loss is prioritized over fast recovery.

Thermal performance is defined by R_θJL = 30 °C/W and R_θJA = 85 °C/W, indicating it relies on PCB copper for heat dissipation. The DO-214AC (SMA) package uses matte tin-plated leads compliant with J-STD-002 and meets JESD 201 Class 2 whisker resistance.

Key Specifications

Pinout & Package

DO-214AC (SMA) package: molded epoxy case meeting UL 94V-0, cathode indicated by band, matte tin-plated leads, 0.060 g typical weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR108 and VS-1N4007-M3/54, the S1K provides optimal balance of voltage rating, SMT manufacturability, and conduction efficiency for cost-sensitive 50–100 kHz industrial power supplies - without sacrificing thermal robustness or regulatory compliance.

Availability

S1K is available at Aetrix Electronics and suitable for DC–DC converters, snubber networks, lighting drivers, and industrial AC line rectification requiring stable component supply and full traceability.

Supply support for S1K 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 semiconductor manufacturer specializing in discrete power devices, including rectifiers, TVS diodes, and MOSFETs, with global distribution and AEC-Q200-qualified product lines.

The S1K belongs to TSC's S1A–S1M surface-mount rectifier family, engineered for high-reliability industrial and consumer power conversion where ruggedness, moisture resistance, and automated assembly compatibility are essential.

FAQ

What is the maximum junction temperature rating for the S1K?

The S1K has a maximum junction temperature (T_J) rating of +175°C, verified per absolute maximum ratings table in the official TSC S2102 datasheet. This allows reliable operation in high-ambient environments such as enclosed LED drivers or industrial control enclosures. Derating curves confirm usable current capacity down to 0.5 A at 125°C ambient with adequate PCB copper. The S1K must be mounted on ≥1 cm² of 2-oz copper to sustain this rating under full load.

Does the S1K have a specified reverse recovery time, and how does it affect circuit design?

Yes, the S1K has a reverse recovery time (t_rr) of 1500 ns, measured at I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. This value indicates it is a standard recovery rectifier - appropriate for converters operating below 100 kHz but not recommended for high-frequency topologies like resonant LLC or active clamp forward where faster diodes reduce switching losses. Designers using the S1K should include snubbers in high-dV/dt nodes to suppress ringing caused by its relatively slow recovery.

Is the S1K RoHS and halogen-free compliant?

Yes, the S1K is fully RoHS compliant per EU Directive 2011/65/EU and halogen-free per IEC 61249-2-21, as confirmed in the "Features" section of the TSC S2102 datasheet. The molding compound is UL 94V-0 rated, and terminals are matte tin-plated to meet J-STD-002 solderability requirements. These attributes make the S1K suitable for export-controlled and environmentally regulated end equipment, including commercial lighting and industrial automation systems.

What is the surge current rating of the S1K, and under what conditions is it specified?

The S1K is rated for a non-repetitive peak forward surge current (I_FSM) of 30 A, specified for an 8.3 ms single half-sine wave superimposed on rated load, per the Absolute Maximum Ratings table in the S2102 datasheet. This rating applies to transient events such as cold-start inrush or output short-circuit recovery. It is not intended for repetitive surges; repeated exposure above 10 A requires thermal derating analysis. The S1K's 30 A I_FSM exceeds that of lower-voltage S1x variants (e.g., S1J = 40 A), reflecting its optimized thermal design for high-V_RRM operation.

How does the S1K's thermal resistance compare to other devices in the S1A–S1M series?

The S1K has a junction-to-lead thermal resistance (R_θJL) of 30 °C/W and junction-to-ambient (R_θJA) of 85 °C/W - identical to S1M and higher than S1A–S1J (27 °C/W and 75 °C/W). This reflects increased die thickness and packaging constraints for higher-voltage variants. To achieve rated 1 A current, the S1K requires more aggressive PCB copper area than S1J. Thermal design must account for this difference; using the same layout for S1K as for S1J may cause premature thermal shutdown or reduced lifetime. The S1K's thermal specs are validated per JEDEC JESD51 standards.