Taiwan Semiconductor Corporation S12KC

Overview

S12KC from Taiwan Semiconductor is a 12A, 800V surface-mount silicon rectifier diode in DO-214AB (SMC) package, featuring glass-passivated junction, low forward voltage drop (≤1.1 V at 12 A), and high surge capability (300 A IFSM). It serves as the main output rectifier in high-efficiency AC/DC converters for industrial power supplies.

For engineers reviewing the S12KC datasheet, S12KC pinout, S12KC application, or S12KC equivalent, key selection criteria include its 800 V VRRM rating, 9 °C/W R_θJL, JESD201 Class 2 whisker resistance, moisture sensitivity level 1, and RoHS/halogen-free compliance - all critical for high-reliability, automated SMT deployment.

Technical Context

The S12KC is a single-die, standard recovery rectifier optimized for switching-mode power conversion. Its 800 V repetitive peak reverse voltage and 280 V RMS reverse voltage define its use in universal-input or high-line SMPS designs where clamping and output rectification demand robust blocking capability.

Thermally, it delivers 9 °C/W junction-to-lead resistance and 44 °C/W junction-to-ambient resistance under natural convection, enabling stable 12 A continuous operation up to 150 °C junction temperature when properly heatsinked via the lead frame. Reverse leakage remains ≤250 µA at 125 °C, supporting thermal stability in enclosed environments.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC), molded epoxy case meeting UL 94V-0; matte tin-plated leads compliant with J-STD-002 solderability; cathode indicated by band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1208D and VS-12EWH08-M3, the S12KC offers lower forward voltage and superior thermal resistance in an industry-standard SMT package - directly improving power density and manufacturability in high-volume AC/DC designs without layout revision.

Availability

S12KC is available at Aetrix Electronics and suitable for industrial SMPS rectification, LED driver output stages, AC/DC adapters, and telecom DC-DC converter input stages requiring stable component supply, full RoHS/halogen-free compliance, and J-STD-020 Level 1 moisture handling.

Supply support for S12KC 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, MOSFETs, and bipolar transistors.

The S12KC belongs to TSC's S12x series of high-current, high-voltage surface-mount rectifiers designed specifically for cost-sensitive yet thermally demanding AC/DC and DC/DC power conversion in industrial, lighting, and adapter applications.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) of the S12KC?

The S12KC has a maximum repetitive peak reverse voltage (V_RRM) of 800 V, as specified in the Absolute Maximum Ratings table. This rating is confirmed across all official documentation from Taiwan Semiconductor and applies strictly to the S12KC variant - distinct from the 400 V (S12GC), 600 V (S12JC), and 1000 V (S12MC) versions in the same family. The 800 V value defines its safe blocking capability in high-line SMPS designs.

Is the S12KC suitable for automated SMT assembly?

Yes, the S12KC is explicitly designed for automated placement and reflow soldering. Its DO-214AB (SMC) package, matte tin-plated leads compliant with J-STD-002, and moisture sensitivity level 1 per J-STD-020 eliminate pre-bake requirements and ensure reliable solder joint formation. The S12KC marking code and polarity band are clearly defined in the package outline, supporting vision-based pick-and-place accuracy.

What is the forward voltage (V_F) of the S12KC at rated current?

The S12KC has a maximum forward voltage (V_F) of 1.1 V at 12 A forward current and 25°C junction temperature, per the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) and represents the upper limit for conduction loss - critical for calculating thermal rise and efficiency in high-power rectifier applications using the S12KC.

Does the S12KC meet halogen-free and RoHS requirements?

Yes, the S12KC is certified halogen-free per IEC 61249-2-21 and RoHS compliant per EU Directive 2011/65/EU. These environmental specifications are explicitly stated in the FEATURES section of the official Taiwan Semiconductor datasheet and verified on the product's material declaration. No brominated flame retardants or chlorine-based compounds are used in the molding compound or plating of the S12KC.

What is the thermal resistance from junction to lead (R_θJL) for the S12KC?

The S12KC has a typical junction-to-lead thermal resistance (R_θJL) of 9 °C/W, as published in the Thermal Performance section of the datasheet. This value is measured under standardized test conditions and enables accurate thermal modeling when the S12KC is mounted on copper-pour PCBs or attached to external heatsinks - essential for maintaining ≤150°C junction temperature under full 12 A load.