Taiwan Semiconductor Corporation SK320A

Overview

SK320A from Taiwan Semiconductor is a 3A, 200V Schottky barrier surface-mount rectifier in DO-214AC (SMA) package, optimized for high-efficiency switching mode power supplies and DC-DC converters where low forward voltage drop and high surge current capability are critical. It features a maximum repetitive peak reverse voltage of 200V, forward voltage of 0.95V at 3A/25°C, and 70A non-repetitive surge current rating.

For engineers reviewing the SK320A datasheet, SK320A pinout, SK320A application, or SK320A equivalent, key selection considerations include its 200V V_RRM, 0.95V V_F at rated current, 150°C junction temperature limit, DO-214AC mechanical outline, and cathode-band polarity marking - all essential for thermal design, layout validation, and replacement qualification in industrial power adapters and LED drivers.

Technical Context

The SK320A operates as a single-die, unidirectional Schottky rectifier with guard-ring over-voltage protection and JESD201 Class 2 whisker resistance. Its 0.95V forward voltage at 3A/25°C enables lower conduction loss than silicon PN rectifiers in high-frequency SMPS outputs, while its 70A I_FSM supports robust transient handling during startup or overload events.

Thermally, it delivers R_θJL = 25°C/W and R_θJA = 66°C/W in standard PCB mounting, enabling reliable operation up to 150°C junction temperature. The device is RoHS-compliant, halogen-free, and rated MSL Level 1 per J-STD-020 - suitable for lead-free reflow without moisture sensitivity concerns.

Key Specifications

Pinout & Package

Package: DO-214AC (SMA), surface-mount plastic case with matte tin-plated leads, cathode indicated by band, weight ≈ 0.070 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS3H200 and SB3200, the SK320A offers balanced performance: its 0.95V V_F and 100µA I_R deliver tighter efficiency/leakage trade-off than SB3200, while maintaining broader thermal robustness (R_θJA = 66°C/W vs. SS3H200's 70°C/W) and lower cost than premium alternatives.

Availability

SK320A is available at Aetrix Electronics and suitable for switching mode power supplies, LED drivers, and industrial DC-DC converters requiring stable component supply across multi-year production cycles.

Supply support for SK320A 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 Taiwanese manufacturer specializing in discrete semiconductors, including rectifiers, TVS diodes, and MOSFETs, with ISO 9001 and IATF 16949 certification.

The SK32A–SK320A family targets cost-effective, high-reliability power conversion in consumer, industrial, and lighting applications - emphasizing ruggedness, manufacturability, and compliance with global environmental standards.

FAQ

What is the maximum junction temperature rating for the SK320A?

The SK320A has a maximum junction temperature (T_J) rating of +150°C. This specification allows the device to operate reliably in thermally demanding environments such as enclosed power adapters or industrial control units without active cooling. Derating curves in the official datasheet confirm usable current capacity down to 1.2A at 150°C ambient with standard PCB layout. The SK320A must not exceed this limit to maintain long-term parametric stability and avoid accelerated wear-out mechanisms.

Does the SK320A have a specified moisture sensitivity level (MSL)?

Yes, the SK320A is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and can be processed using standard lead-free reflow profiles without baking. This eliminates moisture-related popcorning risks during assembly and simplifies manufacturing logistics for high-volume SMT lines. The MSL Level 1 classification applies specifically to the DO-214AC (SMA) package used for the SK320A and is verified in Taiwan Semiconductor's official qualification reports.

What is the forward voltage drop of the SK320A at full rated current?

The SK320A exhibits a typical forward voltage (V_F) of 0.95 V at 3 A and 25°C junction temperature, measured under pulsed conditions (PW = 0.3 ms). This value increases with temperature and current - e.g., ~1.05 V at 100°C. The low V_F directly reduces conduction loss in high-frequency SMPS designs, making the SK320A particularly effective in 50–500 kHz flyback and forward converters where efficiency and thermal management are critical.

Is the SK320A compatible with lead-free soldering processes?

Yes, the SK320A is fully compatible with lead-free soldering processes. Its matte tin-plated leads meet J-STD-002 solderability requirements, and its MSL Level 1 rating permits exposure to peak reflow temperatures up to 260°C without preconditioning. The DO-214AC package body complies with UL 94V-0 flammability standards and withstands multiple thermal cycles without delamination or solder joint integrity loss - confirmed in Taiwan Semiconductor's reliability test reports for the SK320A.

How is polarity marked on the SK320A package?

Polarity on the SK320A is indicated by a distinct cathode band printed on the molded plastic body of the DO-214AC (SMA) package. This band aligns with the cathode terminal, which serves as the output current exit point and primary thermal path to the PCB. Correct orientation is essential for functional operation and thermal performance; reversing the SK320A will result in open-circuit behavior and potential system failure. The marking conforms to JEDEC DO-214AC standard layout and is visible under standard AOI inspection.