Taiwan Semiconductor Corporation SK19B M4G

Overview

SK19B M4G 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), operates up to 150°C junction temperature, and is optimized for switching mode power supplies and DC-DC converters.

For engineers reviewing the SK19B M4G datasheet, SK19B M4G pinout, SK19B M4G application, or SK19B M4G equivalent, key selection criteria include its 90V VRRM rating, low VF performance at elevated temperatures, SMB package thermal resistance (25°C/W), and RoHS/halogen-free compliance for industrial power conversion designs.

Technical Context

The SK19B M4G uses a single-die Schottky structure with guard ring overvoltage protection, enabling robust operation under repetitive voltage transients. Its 10,000 V/µs dV/dt rating supports fast-switching topologies without spurious turn-on.

Thermal design is enabled by a junction-to-lead thermal resistance of 25°C/W and a 150°C maximum junction temperature, allowing sustained 1A conduction in compact SMB layouts without forced airflow when ambient remains below 85°C.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount plastic case with matte tin-plated leads, polarity indicated by cathode band, weight ≈ 0.093g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS19-E3/5AT and SB190, the SK19B M4G offers the lowest reverse leakage at 25°C (100µA), making it preferable in applications requiring tight standby power control, while maintaining identical voltage/current ratings and SMB mechanical compatibility.

Availability

SK19B M4G 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 support, and RoHS-compliant sourcing.

Supply support for SK19B M4G 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 electronics markets since 1979.

The SK19B M4G belongs to TSC's SK1xB Schottky rectifier family, engineered specifically for cost-sensitive, high-volume AC/DC and DC/DC power conversion where low VF, high surge tolerance, and JEDEC-standard packaging are essential.

FAQ

What is the maximum junction temperature rating for the SK19B M4G?

The SK19B M4G has a maximum junction temperature (TJ max) of +150°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet. This allows reliable operation in thermally demanding environments such as enclosed LED drivers or industrial power modules. Derating curves confirm 1A continuous current is sustainable up to 85°C ambient when mounted on a standard 1-inch² copper pad. The SK19B M4G must not be operated beyond this limit to ensure long-term reliability.

Does the SK19B M4G have a specified moisture sensitivity level (MSL)?

Yes, the SK19B M4G is rated MSL Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/85% RH and subjected to standard reflow profiles without baking. This eliminates pre-reflow moisture mitigation steps in SMT assembly, reducing process complexity and cost. The SK19B M4G's MSL Level 1 status is confirmed in the "Features" section of the Taiwan Semiconductor datasheet and applies to all variants in the SK1xB series.

What is the forward voltage of the SK19B M4G at 1A and 100°C junction temperature?

The SK19B M4G forward voltage increases with temperature: while VF is 0.85V at 1A and 25°C, the datasheet does not specify a direct value at 100°C. However, Fig.4 and Fig.6 show typical forward characteristics across temperature - extrapolation from those curves indicates VF ≈ 0.72–0.75V at 1A and 100°C. This negative temperature coefficient is inherent to Schottky diodes and confirms the SK19B M4G's suitability for high-temperature operation without thermal runaway.

Is the SK19B M4G halogen-free and RoHS compliant?

Yes, the SK19B M4G is both RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the "Features" section of the Taiwan Semiconductor datasheet. The molding compound contains no brominated or chlorinated flame retardants, and lead content is below 1000 ppm. These certifications are critical for export to EU, Japan, and South Korea markets, and the SK19B M4G carries full documentation supporting compliance claims.

What is the marking code printed on the SK19B M4G device body?

The SK19B M4G is marked "SK19B" on its molded plastic body, with cathode polarity indicated by a distinct band. The "M4G" suffix in the ordering code denotes tape-and-reel packaging (3,000 units per reel) and green compound (halogen-free). This marking aligns with the "Marking code on the device" table in the SK12B–SK115B datasheet and is visible under standard optical inspection during incoming quality checks for the SK19B M4G.