Taiwan Semiconductor Corporation SK32B

Overview

SK32B from Taiwan Semiconductor is a 3A, 20V Schottky barrier surface-mount rectifier in DO-214AA (SMB) package, optimized for low forward voltage (≤0.50 V at 3 A, 25°C) and high surge current capability (70 A, 8.3 ms half-sine), used in compact switching mode power supplies and AC/DC adapters.

For engineers reviewing the SK32B datasheet, SK32B pinout, SK32B application, or SK32B equivalent, key selection criteria include its 20 V repetitive peak reverse voltage, 125°C maximum junction temperature, guard ring overvoltage protection, RoHS/halogen-free compliance, and J-STD-020 Level 1 moisture sensitivity rating.

Technical Context

The SK32B implements a single-die Schottky barrier structure with metal–semiconductor junction, enabling fast recovery (no minority carrier storage) and low forward conduction loss. Its 23°C/W junction-to-lead thermal resistance supports efficient heat transfer to PCB copper in SMB footprint layouts.

Designed for high-frequency switching applications, it sustains 10,000 V/μs critical rate of rise of off-state voltage and exhibits ≤500 µA reverse leakage at 20 V and 25°C - critical for maintaining efficiency in low-voltage, high-current DC-DC stages.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount plastic case with matte tin-plated leads, polarity indicated by cathode band, weight ≈0.100 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS32 and SB320, the SK32B delivers the lowest forward voltage (≤0.50 V) and lowest room-temperature reverse leakage (≤500 µA), making it optimal for high-efficiency, thermally constrained 20 V rectification where junction temperature must stay below 125°C.

Availability

SK32B is available at Aetrix Electronics and suitable for switching mode power supplies, AC/DC adapters, and LED lighting drivers requiring stable component supply with consistent parametric performance across production lots.

Supply support for SK32B 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 SK32B belongs to TSC's SKx2B Schottky rectifier family, engineered specifically for high-efficiency, surface-mount secondary-side rectification in compact AC/DC and DC/DC converters targeting consumer, computing, and industrial power applications.

FAQ

What is the maximum junction temperature rating for the SK32B?

The SK32B has a maximum junction temperature (T_J) rating of 125°C, as specified in its Absolute Maximum Ratings table. This rating applies under continuous forward conduction at rated current and must be maintained using appropriate PCB copper area and thermal vias. Exceeding 125°C risks irreversible degradation of the Schottky junction. The SK32B datasheet confirms this limit across all versions including P2212.

Does the SK32B have a guard ring structure, and what does it do?

Yes, the SK32B incorporates a guard ring structure explicitly cited in its Features list. This design enhances edge termination robustness, improving resistance to surface flashover and transient overvoltage events without requiring external snubber networks. It directly contributes to the device's 10,000 V/μs dV/dt rating and supports reliable operation in noisy industrial power rails.

Is the SK32B RoHS and halogen-free compliant?

Yes, the SK32B is RoHS compliant and halogen-free per IEC 61249-2-21, as stated in the official Taiwan Semiconductor documentation. Its molding compound, plating, and internal materials meet both directives, supporting compliance for export to EU, China, and other regulated markets. No exemptions or exceptions apply to the SK32B part number.

What is the reverse leakage current specification for the SK32B at 25°C?

The SK32B specifies a maximum reverse leakage current (I_R) of 500 µA at 20 V reverse voltage and 25°C junction temperature. This value is measured under pulse conditions (PW = 30 ms) and reflects typical performance for low-V_R Schottky devices. At 100°C, leakage rises to 10 mA - a critical parameter for standby power budgeting in always-on systems.

What packaging and reel quantity is offered for the SK32B?

The SK32B is supplied in DO-214AA (SMB) package on tape-and-reel format, with 3,000 units per reel, as confirmed in the Ordering Information section of the Taiwan Semiconductor datasheet (Version P2212). This packaging supports high-speed pick-and-place assembly and complies with J-STD-020 Level 1 moisture sensitivity requirements.