Taiwan Semiconductor Corporation S1KH

Overview

S1KH from Taiwan Semiconductor is a 1 A, 800 V surface-mount silicon rectifier diode in DO-214AC (SMA) package, featuring glass-passivated junction, AEC-Q101 qualification, and 1.1 V max forward voltage at 1 A and 25°C. It serves as a general-purpose power rectifier in automotive lighting, DC-DC converters, and snubber circuits.

For engineers reviewing the S1KH datasheet, S1KH pinout, S1KH application, or S1KH equivalent, key selection criteria include peak reverse voltage (800 V), surge current rating (30 A), thermal resistance (R_θJA = 85°C/W), junction temperature range (–55°C to +175°C), and RoHS/halogen-free compliance.

Technical Context

The S1KH is a single-die, standard recovery rectifier with 1500 ns reverse recovery time under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A conditions. Its junction capacitance is 12 pF at 1 MHz and 4.0 V reverse bias, supporting moderate-frequency switching applications.

Thermally, it exhibits R_θJL = 30°C/W and R_θJA = 85°C/W - higher than lower-voltage variants (e.g., S1JH) - reflecting design trade-offs for 800 V blocking capability. Polarity is marked by cathode band on the DO-214AC body.

Key Specifications

Pinout & Package

Package: DO-214AC (SMA), surface-mount, matte tin-plated leads, polarity indicated by cathode band. Weight ≈ 0.060 g. UL 94V-0 molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1R08 and MUR108, the S1KH trades speed for lower forward loss and automotive qualification - making it optimal for thermally constrained, AEC-compliant 1 A rectification where 1500 ns recovery is acceptable.

Availability

S1KH is available at Aetrix Electronics and suitable for automotive LED lighting, DC-DC converter input rectification, and snubber network protection requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for S1KH 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 automotive, industrial, and consumer markets since 1979.

The S1KH belongs to TSC's S1xH series of AEC-Q101-qualified surface-mount rectifiers, engineered specifically for robust, high-temperature operation in automotive power conversion and protection circuits.

FAQ

What is the peak repetitive reverse voltage rating of the S1KH?

The S1KH has a peak repetitive reverse voltage (V_RRM) rating of 800 V. This value is confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version A2102). It defines the maximum reverse-bias voltage the device can block repeatedly without avalanche breakdown, making it suitable for 24 V automotive systems with load-dump protection margins. The S1KH must not be operated beyond this rating in continuous or repetitive conditions.

Is the S1KH qualified for automotive applications?

Yes, the S1KH is explicitly AEC-Q101 qualified per the manufacturer's documentation. This qualification covers stress tests including temperature cycling, high-temperature reverse bias (HTRB), and electrostatic discharge (ESD), ensuring reliability in automotive environments. Its –55°C to +175°C junction temperature range and DO-214AC packaging further support under-hood deployment. The S1KH is intended for automotive LED lighting, infotainment power supplies, and other AEC-compliant systems.

What is the forward voltage drop of the S1KH at rated current?

The S1KH has a maximum forward voltage (V_F) of 1.1 V at I_F = 1 A and T_J = 25°C, as specified in the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms). At elevated junction temperatures (e.g., 125°C), V_F decreases slightly due to semiconductor physics, but system-level thermal design must ensure average power dissipation (I_F × V_F) remains within the S1KH's thermal limits.

Does the S1KH have a defined reverse recovery time?

Yes, the S1KH has a typical reverse recovery time (t_rr) of 1500 ns, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A conditions. This parameter is documented in the Electrical Specifications section of the Taiwan Semiconductor datasheet. Due to its standard recovery behavior, the S1KH is best applied in line-frequency or low-frequency (<50 kHz) rectification - not in high-frequency synchronous rectifier or active clamp circuits where faster diodes are required.

What package type does the S1KH use, and what are its key mechanical features?

The S1KH uses the DO-214AC (SMA) surface-mount package. Key mechanical features include matte tin-plated leads compliant with J-STD-002 solderability, UL 94V-0 flammability-rated molding compound, cathode polarity indicated by a visible band, and a weight of approximately 0.060 g. Its footprint matches industry-standard SMA land patterns, enabling compatibility with automated pick-and-place equipment and reflow soldering processes without pre-baking (MSL Level 1).