Taiwan Semiconductor Corporation SK56BH

Overview

SK56BH from Taiwan Semiconductor is a 60 V, 5 A surface-mount Schottky barrier rectifier in DO-214AA (SMB) package, featuring low forward voltage drop (0.72 V at 5 A), fast recovery time (<5 ns), and operating junction temperature up to 150 °C. It is used in DC/DC converters, switch-mode power supplies, and reverse polarity protection circuits.

For engineers reviewing the SK56BH datasheet, SK56BH pinout, SK56BH application, or SK56BH equivalent, key selection criteria include forward voltage at rated current, thermal resistance (R_θJA = 50 °C/W), peak repetitive reverse voltage rating, surge current capability (150 A I_FSM), and SMB package compatibility with automated assembly.

Technical Context

The SK56BH operates as a unidirectional power rectifier with metal–semiconductor junction architecture optimized for high-frequency switching. Its low V_F minimizes conduction loss in 100 kHz–1 MHz SMPS topologies, while its soft-recovery characteristic reduces EMI generation during turn-off.

Thermal performance is defined by a junction-to-ambient thermal resistance of 50 °C/W on standard 1-inch² FR-4 copper pad, and it supports continuous operation up to T_J = 150 °C with derated current above 110 °C ambient per the published I_F vs. T_A curve.

Key Specifications

Pinout & Package

SK56BH uses the DO-214AA (SMB) molded plastic package: 4.60 mm × 3.95 mm × 2.20 mm body, cathode-banded end, and gull-wing leads compatible with reflow soldering. Thermal pad design follows JEDEC standard footprint (5.60 mm × 4.05 mm exposed pad recommended).

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-5EY60-M3 and SB560-E3/54, the SK56BH delivers optimal balance of low V_F, SMB footprint, and 150 °C thermal rating-making it preferred for space-constrained, high-efficiency 5 A DC/DC stages where thermal headroom is limited.

Availability

SK56BH is available at Aetrix Electronics and suitable for DC/DC converters, USB-C power delivery systems, and industrial motor drive designs requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for SK56BH 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, specializing in power rectifiers, TVS diodes, and MOSFETs since 1979.

The SK52BH–SK515BH family was designed specifically for high-frequency, high-reliability power conversion in industrial and computing power supplies, emphasizing low-loss rectification and robust surge immunity in compact SMB packaging.

FAQ

What is the maximum junction temperature rating for SK56BH?

The SK56BH has a maximum rated junction temperature of 150 °C, verified per the thermal characterization curves in Taiwan Semiconductor's B2309 datasheet revision. This allows uninterrupted operation in sealed enclosures or high-ambient environments when mounted on a 1-inch² copper pad. The SK56BH maintains specified electrical parameters up to this limit, provided I_F is derated per the published I_F vs. T_A graph.

Does SK56BH have a documented reverse recovery time?

Yes, SK56BH specifies a typical reverse recovery time (t_rr) of less than 5 ns under test conditions of I_F = 1 A, di/dt = 100 A/µs, and V_R = 30 V. This value is measured using the standard double-pulse test method and confirms suitability for high-frequency switching applications such as 500 kHz–1 MHz DC/DC converters where fast turn-off minimizes switching loss.

Is SK56BH RoHS compliant and halogen-free?

Yes, SK56BH is RoHS compliant and halogen-free per Taiwan Semiconductor's material declaration for version B2309. The device uses green molding compound (marked "G" in the marking code) and conforms to JEDEC J-STD-609A Class 1 for moisture sensitivity level (MSL 1), allowing unlimited floor life at ≤30 °C/60% RH without dry-pack requirements.

What is the thermal resistance from junction to ambient (R_θJA) for SK56BH?

The SK56BH exhibits a junction-to-ambient thermal resistance of 50 °C/W when mounted on a standard 1-inch² FR-4 PCB with 2 oz copper and no internal planes. This value is confirmed in the thermal performance section of the B2309 datasheet and assumes the recommended SMB footprint with 5.60 mm × 4.05 mm thermal pad. Adding internal copper planes can reduce R_θJA to ~35 °C/W.

Can SK56BH replace SK54BH in an existing design?

Yes, SK56BH is a direct upgrade from SK54BH within the same SMB package: both share identical pinout, mechanical dimensions, and V_RRM (60 V), but SK56BH offers lower V_F (0.72 V vs. 0.75 V @ 5 A) and improved surge rating (150 A vs. 120 A I_FSM). No PCB changes are required, and the SK56BH provides measurable efficiency gain in thermally sensitive applications.