Taiwan Semiconductor Corporation S12KC R7G

Overview

S12KC R7G from Taiwan Semiconductor is a 12A, 800V surface-mount glass-passivated silicon rectifier in DO-214AB (SMC) package, featuring low forward voltage drop (≤1.1 V at 12 A), high surge capability (300 A IFSM), and junction temperature rating up to +150°C - deployed in SMPS primary-side rectification and industrial AC/DC converters.

For engineers reviewing the S12KC R7G datasheet, S12KC R7G pinout, S12KC R7G application, or S12KC R7G equivalent, key selection criteria include repetitive peak reverse voltage (800 V), thermal resistance (9 °C/W junction-to-lead), moisture sensitivity level (J-STD-020 Level 1), RoHS/halogen-free compliance, and DO-214AB mechanical compatibility with automated placement.

Technical Context

The S12KC R7G is a single-die, standard recovery rectifier optimized for high-efficiency switching power supplies operating at 50–100 kHz. Its glass-passivated junction ensures stable reverse leakage (<1 µA at 25°C, <250 µA at 125°C) and robust surge immunity under 8.3 ms half-sine transients.

Thermally, it delivers 9 °C/W junction-to-lead resistance and 44 °C/W junction-to-ambient resistance in standard PCB mounting, enabling reliable 12 A continuous conduction without forced air when used with adequate copper pour. Polarity is marked by a cathode band on the DO-214AB body.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, polarity indicated by cathode band, weight ≈ 0.270 g, UL 94V-0 molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1208D, the S12KC R7G offers superior thermal performance in SMT form factor and lower VF; versus VS-12EWH08-M3, it trades marginally lower VF for tighter leakage control (<1 µA vs. <5 µA) and JESD 201 Class 2 whisker resistance - critical for long-life industrial deployments.

Availability

S12KC R7G is available at Aetrix Electronics and suitable for industrial SMPS rectification, LED driver input stages, AC/DC adapter output circuits, and DC link protection in motor drives requiring stable component supply and long-term lifecycle support.

Supply support for S12KC R7G 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 industrial markets since 1979.

The S12GC–S12MC family was designed specifically for high-reliability, high-current AC/DC conversion in cost-sensitive yet thermally demanding applications - emphasizing manufacturability, JEDEC-compliant packaging, and extended temperature operation.

FAQ

What is the maximum junction temperature rating for the S12KC R7G?

The S12KC R7G has a maximum junction temperature (TJ max) of +150°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet D2102. This allows the S12KC R7G to operate reliably in enclosed industrial environments where ambient temperatures reach +85°C, provided thermal design meets RθJL ≤ 9 °C/W via adequate PCB copper area. Derating curves confirm 12 A continuous current is maintainable up to +125°C case temperature.

Does the S12KC R7G meet RoHS and halogen-free requirements?

Yes, the S12KC R7G is RoHS compliant per EU Directive 2011/65/EU and halogen-free per IEC 61249-2-21. These qualifications are explicitly stated in the "Features" section of the Taiwan Semiconductor datasheet D2102 and confirmed by material declarations. The S12KC R7G uses matte tin-plated leads and UL 94V-0 molding compound, supporting green manufacturing and end-of-life recycling without brominated flame retardants.

What is the forward voltage drop specification for the S12KC R7G at rated current?

The S12KC R7G exhibits a maximum forward voltage drop (VF) of 1.1 V at 12 A forward current and 25°C junction temperature, per the "Electrical Specifications" table in datasheet D2102. This value is measured under pulse conditions (PW = 0.3 ms) to avoid self-heating effects. At elevated temperatures (e.g., 125°C), VF decreases slightly, improving conduction efficiency in thermally stabilized systems where the S12KC R7G operates near its thermal limit.

Is the S12KC R7G suitable for automated SMT assembly?

Yes, the S12KC R7G is explicitly optimized for automated placement, as noted in its "Features" list. It carries J-STD-020 Moisture Sensitivity Level 1 (no baking required), J-STD-002-compliant solderability, and DO-214AB (SMC) geometry compatible with standard pick-and-place nozzles and reflow profiles. The cathode band marking ensures correct orientation during vision-based placement, and the 0.270 g weight prevents tombstoning in typical 250 mm/s placement cycles.

What is the repetitive peak reverse voltage (VRRM) of the S12KC R7G?

The S12KC R7G has a repetitive peak reverse voltage (VRRM) of 800 V, as defined in the "Absolute Maximum Ratings" table of Taiwan Semiconductor's datasheet D2102. This value is fixed for the "KC" variant within the S12GC–S12MC family and is validated under transient conditions per IEC 61000-4-5. The 800 V rating supports use in 400 V AC mains applications with ≥100% safety margin against line surges and ringing transients encountered in industrial-grade power supplies using the S12KC R7G.