Taiwan Semiconductor Corporation SK110B

Overview

SK110B from Taiwan Semiconductor is a 1A, 100V Schottky barrier surface-mount rectifier in DO-214AA (SMB) package, featuring 0.85V forward voltage at 1A and 100µA reverse leakage at 25°C, optimized for high-efficiency switching power supplies and DC-DC converters.

For engineers reviewing the SK110B datasheet, SK110B pinout, SK110B application, or SK110B equivalent, key selection criteria include its 100V V_RRM, 30A I_FSM surge rating, 25°C/W junction-to-lead thermal resistance, and compatibility with automated SMT placement per J-STD-020 Level 1 moisture sensitivity.

Technical Context

The SK110B employs a single-die Schottky junction architecture enabling low forward voltage drop and fast recovery-critical for minimizing conduction losses in high-frequency SMPS topologies. Its guard ring structure provides enhanced overvoltage robustness without compromising switching speed.

Rated for continuous operation up to 150°C junction temperature and validated for JESD201 Class 2 whisker resistance, the device supports reliable performance in thermally constrained industrial and adapter applications where thermal cycling and long-term solder joint integrity are design priorities.

Key Specifications

Pinout & Package

DO-214AA (SMB) surface-mount package with cathode-indicated polarity band; molded plastic body meets UL 94V-0; matte tin-plated leads compliant with J-STD-002 solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS110 and SB1100, the SK110B offers the best balance of low leakage (100µA), high thermal capability (150°C), and industry-standard SMB footprint-making it optimal for thermally demanding, long-life industrial and adapter designs where reliability trumps marginal V_F reduction.

Availability

SK110B is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and LED lighting drivers requiring stable component supply across multi-year production cycles.

Supply support for SK110B 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 semiconductor manufacturer specializing in discrete power devices, including rectifiers, TVS diodes, and MOSFETs, with ISO/TS 16949 and IATF 16949 certification.

The SK1xxB series was designed specifically for cost-sensitive, high-volume power conversion applications demanding robust Schottky performance in standardized SMB packaging-targeting consumer, industrial, and lighting markets.

FAQ

What is the maximum junction temperature rating for the SK110B?

The SK110B has a maximum junction temperature (T_J) rating of +150°C, verified per absolute maximum ratings table in the official Taiwan Semiconductor datasheet Version M2212. This allows the SK110B to operate reliably in enclosed, high-ambient environments such as sealed LED drivers or compact wall adapters without derating at full current up to 105°C ambient.

Does the SK110B have a guard ring structure, and what benefit does it provide?

Yes, the SK110B incorporates a guard ring for overvoltage protection, explicitly listed in its FEATURES section. This structure enhances edge termination robustness, preventing localized avalanche breakdown during voltage transients-improving long-term reliability in unregulated input conditions common in offline SMPS designs using the SK110B.

Is the SK110B suitable for automated SMT assembly, and what standards does it meet?

Yes, the SK110B is optimized for automated placement, as confirmed in its FEATURES list. It meets J-STD-020 moisture sensitivity Level 1, requires no baking prior to reflow, and features matte tin-plated leads compliant with J-STD-002 solderability-ensuring consistent wetting and joint formation in high-speed pick-and-place and reflow processes.

What is the reverse leakage current of the SK110B at rated voltage and elevated temperature?

At rated 100V reverse voltage and 25°C, the SK110B exhibits ≤100µA reverse current. At 125°C and 100V, leakage rises to ≤2mA-values confirmed in the ELECTRICAL SPECIFICATIONS table. This controlled leakage profile makes the SK110B suitable for applications where standby power budget is critical, such as Energy Star-compliant adapters.

How does the SK110B's forward voltage compare to other 100V Schottky rectifiers in the same SMB package?

The SK110B specifies 0.85V typical forward voltage at 1A and 25°C-lower than SS110 (0.87V) and aligned with industry benchmarks for 100V-class Schottky rectifiers. This value is measured under standardized pulse conditions (PW = 0.3ms), ensuring repeatable comparison across vendors when evaluating conduction loss in the SK110B's target applications.