Taiwan Semiconductor Corporation SK32B M4G

Overview

SK32B from Taiwan Semiconductor is a 3A, 20V Schottky barrier surface-mount rectifier in DO-214AA (SMB) package, featuring low forward voltage (≤0.50 V at 3 A, 25°C), high surge current capability (70 A), and junction temperature rating up to +125°C. It serves as a primary output rectifier in compact AC/DC adapters and DC/DC converters requiring high efficiency and fast switching.

For engineers reviewing the SK32B datasheet, SK32B pinout, SK32B application, or SK32B equivalent, key selection criteria include forward voltage drop at rated current, reverse leakage at elevated temperature, thermal resistance (R_θJL = 23°C/W), repetitive peak reverse voltage (20 V), and SMB package compatibility with automated SMT assembly.

Technical Context

The SK32B employs a single-die Schottky junction optimized for low conduction loss in low-voltage, high-current DC output stages. Its guard ring structure provides overvoltage protection, and its matte tin-plated leads meet J-STD-002 solderability requirements.

Designed for operation up to 125°C junction temperature, it delivers stable performance under transient load conditions with 70 A non-repetitive surge rating (8.3 ms half-sine) and 10,000 V/μs critical rate of rise of off-state voltage (dV/dt).

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount, cathode indicated by band. Dimensions: 4.60 × 3.95 × 2.20 mm (L × W × H). 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 offers the lowest specified forward voltage (≤0.50 V) and identical thermal performance in SMB, making it optimal for thermally constrained, high-efficiency adapter and lighting designs where every millivolt of drop matters.

Availability

SK32B is available at Aetrix Electronics and suitable for AC/DC adapters, USB PD chargers, and LED lighting drivers requiring stable component supply, consistent parametric performance, and JEDEC-compliant SMB packaging.

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 semiconductor manufacturer specializing in discrete power devices, including rectifiers, TVS diodes, and MOSFETs, with ISO/TS 16949 and ISO 14001 certifications.

The SK32B belongs to TSC's SK3xB Schottky rectifier family, engineered for high-efficiency, low-voltage DC output stages in consumer and industrial power supplies where low VF and robust surge handling are critical.

FAQ

What is the maximum junction temperature rating for the SK32B?

The SK32B has a maximum junction temperature (T_J) rating of +125°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet (P2212). This allows reliable operation in enclosed adapters and lighting fixtures without active cooling. The device must be derated above 25°C ambient per the forward current derating curve in Figure 1. SK32B maintains full 3 A rating only up to ~60°C ambient with standard PCB copper area.

Does the SK32B have a halogen-free construction?

Yes, the SK32B uses halogen-free molding compound compliant with IEC 61249-2-21, as confirmed in the "Features" section of the Taiwan Semiconductor datasheet (P2212). This meets environmental compliance requirements for RoHS and REACH-regulated markets. The device carries no brominated or chlorinated flame retardants, and its UL 94V-0 flammability rating is achieved using alternative chemistries.

What is the reverse leakage current of the SK32B at 100°C?

At 100°C junction temperature and rated 20 V reverse voltage, the SK32B exhibits a maximum reverse leakage current (I_R) of 10 mA, per the Electrical Specifications table in the Taiwan Semiconductor datasheet (P2212, page 2). This value is measured under pulse conditions (PW = 30 ms) and reflects real-world behavior in hot-running power supplies where thermal management is limited.

Is the SK32B compatible with lead-free reflow soldering profiles?

Yes, the SK32B features matte tin-plated leads qualified per J-STD-002 for solderability, and its moisture sensitivity level is rated Level 1 (per J-STD-020), meaning it can be stored indefinitely at ≤30°C/85% RH without baking. It fully supports standard IPC/JEDEC lead-free reflow profiles (peak 260°C, 10–15 sec), with no special handling required prior to assembly.

What does the "B" suffix indicate in SK32B?

The "B" suffix in SK32B denotes Taiwan Semiconductor's standard Schottky rectifier variant with DO-214AA (SMB) package, matte tin leads, and full compliance with RoHS and halogen-free standards. It distinguishes this series from earlier or alternate versions (e.g., non-halogen-free or different plating), and is reflected in the ordering code SK3xB, where "x" indicates voltage rating (2 = 20 V for SK32B).