Taiwan Semiconductor Corporation SK19B R5G

Overview

SK19B R5G from Taiwan Semiconductor is a 1A, 90V Schottky barrier surface-mount rectifier in DO-214AA (SMB) package, featuring 0.85V forward voltage at 1A and 100µA reverse leakage at 25°C. It delivers high surge current capability (30A IFSM), 10,000 V/µs dV/dt rating, and operates up to 150°C junction temperature - deployed in compact AC/DC adapters and DC-DC converters.

For engineers reviewing the SK19B R5G datasheet, SK19B R5G pinout, SK19B R5G application, or SK19B R5G equivalent, key selection criteria include its 90V VRRM rating, low VF for efficiency-critical 1A power paths, SMB footprint compatibility, and thermal performance validated to TJ = 150°C with RθJL = 25°C/W.

Technical Context

The SK19B R5G is a single-die Schottky rectifier optimized for high-frequency switching applications where low forward voltage and fast recovery are critical. Its guard ring structure provides overvoltage protection, and the matte tin-plated leads meet J-STD-002 solderability standards.

Rated for repetitive peak reverse voltage of 90V and RMS reverse voltage of 63V, it supports operation across -55°C to +150°C junction range with moisture sensitivity level 1 per J-STD-020 - enabling reflow-compatible assembly without dry-pack requirements.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount plastic case with cathode band polarity marking; dimensions 4.60 × 3.95 × 2.20 mm (L × W × H); UL 94V-0 rated molding compound; weight ≈ 0.093 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS19 and SB190, the SK19B R5G offers superior thermal endurance (150°C TJ max) and surge robustness (30A IFSM) while maintaining competitive VF - making it optimal for industrial adapters and converters subject to thermal cycling and line surges.

Availability

SK19B R5G is available at Aetrix Electronics and suitable for AC/DC adapters, DC-DC converters, and LED drivers requiring stable component supply, consistent SMB packaging, and verified 150°C thermal performance.

Supply support for SK19B R5G 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 and protection markets since 1979.

The SK19B R5G belongs to TSC's SK1xB Schottky rectifier family, engineered for cost-effective, high-reliability rectification in space-constrained, thermally demanding consumer and industrial power supplies.

FAQ

What is the maximum junction temperature rating for the SK19B R5G?

The SK19B R5G has a maximum junction temperature (TJ max) of +150°C, confirmed in the Absolute Maximum Ratings table. This allows reliable operation in enclosed or high-ambient environments where thermal management is limited. The device maintains specified electrical performance up to this temperature, and its RθJL of 25°C/W supports effective heat transfer to PCB copper. Always verify board-level thermal design using the derating curve in Figure 1 of the SK19B R5G datasheet.

Does the SK19B R5G have a RoHS and halogen-free certification?

Yes, the SK19B R5G is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the FEATURES section of the official datasheet. The matte tin-plated leads also comply with J-STD-002 solderability requirements. These certifications are verified for the DO-214AA (SMB) package variant shipped under ordering code SK19B R5G, and no exemptions apply.

What is the forward voltage drop of the SK19B R5G at 1A and 25°C?

The forward voltage (VF) of the SK19B R5G is 0.85 V at IF = 1 A and TJ = 25°C, per the Electrical Specifications table. This value is measured under pulse test conditions (PW = 0.3 ms). At elevated temperatures (e.g., 100°C), VF decreases slightly due to Schottky physics, but system-level efficiency calculations should use the 25°C value unless thermal modeling confirms actual junction temperature.

Is the SK19B R5G suitable for use in high-frequency switching applications?

Yes, the SK19B R5G is specifically designed for high-frequency switching applications such as SMPS, adapters, and DC-DC converters. Its Schottky barrier construction provides inherently fast recovery with negligible reverse recovery charge (Qrr), and its 10,000 V/µs dV/dt rating ensures immunity to rapid voltage transients. No external snubber is required in typical 100–500 kHz designs, as confirmed by TSC's characterization curves and application notes for the SK1xB series.

What does the "R5G" suffix indicate in SK19B R5G?

The "R5G" suffix in SK19B R5G denotes tape-and-reel packaging: "R" = reel, "5" = 3,000 units per reel, and "G" = green (halogen-free) compound. This matches the Ordering Information table, which specifies "SK1xB" devices shipped in DO-214AA (SMB) package at 3,000 per tape-and-reel. The base device remains electrically and thermally identical to SK19B - R5G is a packing variant, not a parametric revision.