Taiwan Semiconductor Corporation SK29A

Overview

SK29A from Taiwan Semiconductor is a 2 A, 90 V Schottky barrier surface-mount rectifier in DO-214AC (SMA) package, optimized for high-efficiency switching power supplies and DC-DC converters. It delivers low forward voltage (0.85 V at 2 A, 25°C), ultra-low reverse leakage (0.1 mA at rated VR, 25°C), and high surge capability (50 A IFSM), enabling compact, thermally efficient designs in adapter and lighting applications.

For engineers reviewing the SK29A datasheet, SK29A pinout, SK29A application, or SK29A equivalent, key selection criteria include its 90 V VRRM rating, 0.85 V VF at full load, 0.1 mA IR at 25°C, junction temperature range up to +150°C, and DO-214AC mechanical compatibility with automated SMT assembly lines.

Technical Context

The SK29A employs a single-die Schottky junction structure with guard ring over-voltage protection, enabling robust operation under transient stress. Its 10,000 V/µs dV/dt rating and 20 mJ non-repetitive avalanche energy (ERSM) support reliable performance in fast-switching topologies like flyback and boost converters.

Thermally, it features an R_θJA of 88°C/W and operates across –55°C to +150°C junction temperature range. The device uses matte tin-plated leads compliant with J-STD-002 solderability and meets JESD 201 Class 2 whisker resistance and UL 94V-0 flammability standards.

Key Specifications

Pinout & Package

Package: DO-214AC (SMA), surface-mount, cathode indicated by band. Molded plastic body meets UL 94V-0; terminals are matte tin-plated per J-STD-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SK29A, VS-2EY90 offers marginally better conduction efficiency but demands more aggressive thermal management, while SB290 provides full mechanical compatibility with relaxed electrical specs-making SK29A the balanced choice for cost-sensitive, thermally constrained 90 V rectification.

Availability

SK29A is available at Aetrix Electronics and suitable for AC-DC adapters, LED drivers, and industrial DC-DC converters requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for SK29A 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 management and industrial markets since 1979.

The SK22A–SK215A family targets high-volume, cost-optimized Schottky rectification in consumer and industrial power supplies, emphasizing reliability, SMT readiness, and compliance with environmental standards including RoHS and halogen-free requirements.

FAQ

What is the maximum junction temperature rating for SK29A?

The SK29A has a maximum junction temperature (T_J) rating of +150°C, verified per absolute maximum ratings table in the official TSC datasheet (Version S2307). This allows uninterrupted operation in sealed enclosures or high-ambient environments without current derating, provided thermal design meets R_θJA = 88°C/W with adequate copper area. The SK29A maintains full 2 A forward current capability up to this limit.

Does SK29A require moisture baking before reflow soldering?

No, SK29A does not require moisture baking prior to reflow. It is rated at Moisture Sensitivity Level (MSL) 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/85% RH and processed directly through standard lead-free reflow profiles without preconditioning. This simplifies SMT line integration and eliminates bake-related yield loss for the SK29A.

What is the reverse leakage current of SK29A at 100°C junction temperature?

Per the Electrical Specifications table in the SK22A–SK215A datasheet (Version S2307), the SK29A exhibits a maximum reverse leakage current (I_R) of 2 mA at 100% rated V_RRM (90 V) and T_J = 125°C. At 100°C, the value is not explicitly tabulated, but curve Fig.7 shows I_R ≈ 0.3 mA at 90 V and 100°C - consistent with the SK29A's specified 0.1 mA at 25°C and 2 mA at 125°C.

Is SK29A pin-compatible with other devices in the SK2xA series?

Yes, all SK2xA devices-including SK29A-share identical DO-214AC (SMA) package dimensions, anode/cathode terminal assignment, and polarity marking (cathode band). They are mechanically interchangeable on PCBs; however, electrical parameters differ significantly (e.g., V_RRM ranges from 20 V to 150 V, VF from 0.50 V to 0.95 V), so electrical validation is required before substitution. The SK29A specifically supports 90 V systems.

What is the surge current rating of SK29A and how is it tested?

The SK29A has a non-repetitive peak forward surge current (I_FSM) rating of 50 A, tested per JEDEC standard using an 8.3 ms single half-sine wave superimposed on rated DC load. This rating is validated across the full –55°C to +150°C junction temperature range and reflects the device's ability to survive cold-start inrush without bond wire fusing. The SK29A maintains this rating without derating at room temperature.