Taiwan Semiconductor Corporation S15KC

Overview

S15KC from Taiwan Semiconductor is a 15A, 800V surface-mount silicon rectifier diode in DO-214AB (SMC) package, featuring glass-passivated junction, low forward voltage drop (≤1.1 V at 15 A), and high surge capability (350 A, 8.3 ms). It serves as a primary output rectifier in AC/DC power supplies for telecom infrastructure and industrial SMPS.

For engineers reviewing the S15KC datasheet, S15KC pinout, S15KC application, or S15KC equivalent, key selection criteria include its 800 V repetitive peak reverse voltage, 15 A average forward current rating, thermal resistance (R_θJL = 8 °C/W), and RoHS/halogen-free compliance for high-reliability power conversion designs.

Technical Context

The S15KC is a single-die, standard recovery rectifier optimized for switching-mode power supplies operating up to 100 kHz. Its glass-passivated junction ensures stable reverse leakage (<1 µA at 25°C, <250 µA at 125°C) and robust moisture resistance (J-STD-020 Level 1).

Thermal performance is defined by R_θJL = 8 °C/W and R_θJA = 44 °C/W, enabling reliable operation at T_J up to +150°C. The device uses matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC) - Surface-mount plastic case with cathode band marking; 7.11 mm × 6.22 mm footprint, 2.36 mm height; UL 94V-0 rated molding compound; weight ≈ 0.270 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1508D and VS-15EWH08-M3, the S15KC offers the lowest forward voltage in its voltage class while maintaining SMT compatibility and J-STD-020 Level 1 moisture sensitivity-making it optimal for cost-sensitive, high-volume telecom and server power supplies where thermal management and assembly efficiency are critical.

Availability

S15KC is available at Aetrix Electronics and suitable for telecom AC/DC power supplies, industrial motor drive power stages, and server PSU secondary rectification requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.

Supply support for S15KC 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 power electronics and automotive markets since 1979.

The S15KC belongs to TSC's S15x series of high-current surface-mount rectifiers, engineered specifically for high-efficiency, high-reliability switching power supplies in telecom, computing, and industrial equipment where thermal robustness and manufacturing compatibility are essential.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S15KC?

The S15KC has a maximum repetitive peak reverse voltage (V_RRM) of 800 V, as specified in the absolute maximum ratings table of the official Taiwan Semiconductor datasheet (Version C2102). This value is fixed for the S15KC variant and distinguishes it from S15GC (400 V), S15JC (600 V), and S15MC (1000 V) within the same family. The 800 V rating enables use in 400 VAC-input systems with adequate safety margin.

Does the S15KC support automated pick-and-place assembly?

Yes, the S15KC supports automated placement per its mechanical data: it features a DO-214AB (SMC) package with matte tin-plated leads compliant with J-STD-002 solderability, and is rated J-STD-020 Level 1 for moisture sensitivity-meaning it can be stored indefinitely before reflow without baking. Its standardized footprint and cathode-band polarity marking ensure reliable vision-based alignment on SMT lines.

What is the typical forward voltage (V_F) of the S15KC at rated current?

The S15KC has a maximum forward voltage (V_F) of 1.1 V at 15 A and 25°C junction temperature, per the electrical specifications table. Typical V_F is not published, but the guaranteed max of 1.1 V ensures predictable conduction loss in thermal modeling. At elevated temperatures (e.g., 125°C), V_F decreases slightly, improving efficiency under sustained load.

Is the S15KC halogen-free and RoHS compliant?

Yes, the S15KC is both RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the FEATURES section of the Taiwan Semiconductor datasheet. The molding compound contains no brominated or chlorinated flame retardants, and lead content is below 1000 ppm, satisfying EU Directive 2011/65/EU and JEDEC J-STD-609A Class 1 requirements.

What is the junction-to-lead thermal resistance (R_θJL) of the S15KC?

The S15KC has a typical junction-to-lead thermal resistance (R_θJL) of 8 °C/W, as listed in the THERMAL PERFORMANCE table. This value reflects heat transfer from the silicon die to the lead frame under conduction-limited conditions and is critical for estimating temperature rise when mounted on PCB copper pours or heatsinks. It is measured per JEDEC JESD51-14 standards.