Taiwan Semiconductor Corporation SK55CH

Overview

SK55CH from Taiwan Semiconductor is a 5A, 50V Schottky barrier surface-mount rectifier in DO-214AB (SMC) package, featuring 0.75V forward voltage at 5A/25°C, 120A surge capability, AEC-Q101 qualification, and guard ring for overvoltage protection-used in automotive DC/DC converters and reverse battery protection circuits.

For engineers reviewing the SK55CH datasheet, SK55CH pinout, SK55CH application, or SK55CH equivalent, key selection criteria include its 50V V_RRM, low VF performance at high current, thermal resistance (R_θJL = 13°C/W), AEC-Q101 qualification, and DO-214AB mechanical compatibility with automated SMT placement.

Technical Context

The SK55CH operates as a single-die, unidirectional Schottky rectifier optimized for low-loss, high-frequency switching in automotive power rails. Its junction-to-lead thermal resistance of 13°C/W enables efficient heat transfer to PCB copper pads, while the guard ring structure enhances ruggedness against transient overvoltage events.

Designed for operation across –55°C to +150°C junction temperature range, it delivers stable reverse leakage ≤10 mA at 100°C and ≤0.5 mA at 25°C under rated 50V reverse bias-critical for reliable freewheeling and reverse polarity protection in 12V/24V vehicle systems.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC), surface-mount plastic case with matte tin-plated leads, cathode indicated by band, moisture sensitivity level 1 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SK55CH, VS-50SQ030NTR-M3 offers lower forward drop but insufficient voltage margin for 24V automotive transients, while SB550 matches V_RRM, VF, and qualification-making it a functionally aligned second-source option without layout change.

Availability

SK55CH is available at Aetrix Electronics and suitable for automotive DC/DC converters, reverse battery protection circuits, and car lighting systems requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.

Supply support for SK55CH 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 SK52CH–SK520CH family targets high-reliability automotive power rectification, emphasizing AEC-Q101 qualification, low VF, and rugged packaging for under-hood and lighting applications.

FAQ

What is the maximum junction temperature rating for SK55CH?

The SK55CH has a maximum junction temperature (T_J) rating of +150°C, verified per AEC-Q101 stress testing. This allows uninterrupted operation in high-ambient environments such as engine compartments or sealed LED headlamp housings. The device must be mounted on a PCB with adequate copper area to maintain T_J ≤150°C under full 5A load, leveraging its R_θJL of 13°C/W for thermal path optimization. SK55CH thermal performance is characterized on a 16mm × 16mm Cu pad test board.

Is SK55CH suitable for reverse battery protection in 24V automotive systems?

Yes, SK55CH is explicitly designed for reverse battery protection in 12V and 24V automotive systems. Its 50V V_RRM provides sufficient margin above nominal 24V plus ISO 7637-2 load dump spikes (up to 35V), and its 120A I_FSM handles momentary short-circuit currents during misconnection. The AEC-Q101 qualification confirms reliability under automotive temperature cycling, vibration, and humidity stress-making SK55CH a validated choice for this safety-critical function.

What is the forward voltage of SK55CH at 5A and 100°C junction temperature?

The forward voltage (V_F) of SK55CH is not specified at 100°C in the official datasheet; only the 25°C value (0.75V @ 5A) and reverse leakage data are provided at elevated temperatures. However, typical Schottky behavior shows V_F decreases ~2 mV/°C, so V_F at 100°C would be approximately 0.60–0.63V. For design-critical applications, engineers should verify actual V_F using SK55CH's Fig.4–Fig.6 forward characteristics curves or perform bench validation under thermal soak conditions.

Does SK55CH have a halogen-free and RoHS-compliant construction?

Yes, SK55CH uses halogen-free molding compound and complies with RoHS Directive 2011/65/EU. The device meets J-STD-020 moisture sensitivity level 1, has matte tin-plated leads solderable per J-STD-002, and passes JESD201 Class 2 whisker testing. These attributes are confirmed in the "FEATURES" section of the SK52CH–SK520CH datasheet (Version C2311), supporting environmental compliance for global automotive and industrial programs.

What is the marking code and polarity indication for SK55CH?

The SK55CH is marked "SK55C" on the device body, with cathode polarity indicated by a distinct band at one end of the DO-214AB (SMC) package. This band aligns with the cathode terminal, which must be connected toward the higher-potential node in rectifier or reverse protection configurations. The marking follows JEDEC-compliant conventions and is visible under standard optical inspection-ensuring correct orientation during automated pick-and-place and manual assembly verification.