Engineered for high density, optimal RDS(on) performance, and low gate charge requirements in next-gen USB-C adapters.
As consumer electronics, high-power laptops, and smart appliances demand rapidly increasing power profiles, the design of power delivery systems has undergone a fundamental shift.
Modern USB-C Power Delivery (USB-PD 3.0 / 3.1) standards can now deliver up to 240W of power (EPR mode, up to 48V at 5A). Handling this massive throughput within small, lightweight enclosures requires highly efficient conversion topologies like active clamp flyback (ACF), LLC resonant converters, and synchronous rectification (SR).
In these designs, MOSFETs serve as the crucial backbone. They act as high-frequency primary-side switches and low-side synchronous rectifiers. High efficiency requires devices with incredibly low drain-to-source on-resistance (RDS(on)) and minimal gate charge (Qg) to limit conduction and switching losses. Without specialized high-frequency silicon or wide bandgap devices, USB-C chargers would face severe thermal bottlenecks, causing power throttling and reduced lifespan.
Figure 1: Fully integrated quality control and inspection at our modern semiconductor facility.
How the localized supply chain in Shenzhen and Hong Kong empowers international electronics manufacturers.
China's Greater Bay Area houses a dense network of raw silicon providers, lead frame fabricators, packaging foundries, and testing facilities. Sourcing directly from this ecosystem dramatically reduces lead times for major series like the DFN, TO-252, and SOT-23 packages.
Whether testing custom gate structures or modifying package configurations, manufacturers based in China can complete prototype adjustments within days. This acceleration of the design loop helps brands capture market trends ahead of competitors.
Modern Chinese foundries employ rigorous, automotive-grade validation processes. This guarantees that replacement parts deliver reliable thermal performance and electrical stability, matching or exceeding international brand specifications.
Active MOSFET Models
Advanced Packages
Voltage Coverage
Strict QC & Testing
HONGKONG Olukey INDUSTRY CO., LIMITED is a solution provider focusing on the overall solution of electronic product components. The main products mainly include: WINSOK MOSFET, Cmsemicon MCU, PCBA circuit board solution development and other three types of product lines.
At present, the products of Olukey Industry are widely used in automotive electronics, military electronics, smart industry, new energy, smart medical care, 5G, Internet of Things, smart home, and various consumer electronics products. Relying on the advantages of global general agents of major original factories, we are based in the Asia-Pacific market. Provide customers with various advanced high-tech electronic components by using comprehensive superior services, assist manufacturers in producing high-quality products and provide comprehensive services.
We use comprehensive high-quality services to provide customers with various types of advanced high-tech electronic components, assist manufacturers in producing high-quality products and provide comprehensive services. Over the years, the company has relied on reputation to survive, adhering to the tenet of "quality first, service first", and has established good cooperative relationships with many high-tech enterprises and original manufacturers at home and abroad.
Relying on the advantages of global general agents of major original manufacturers, we are based on the Asia-Pacific market. Through active market development and effective resource integration, it has become one of the outstanding and fast-growing agents in the Asia-Pacific region. The company has many years of professional distribution experience.
WINSOK MOSFET's product voltages are mainly medium and low voltage: 15V, 20V, 30V, 40V, 60V, 80V, 100V, 120V, 150V, 200V, 250V, 300V, 400V, 500V, 600V, 650V. The main packages include DFN3X3-8, DFN5X6-8, TO-252, TO-263, SOP-8, SOT-23, TO-220, etc. There are more than 600 models and more than 40 packages. Extensive coverage of medium-voltage and low-voltage MOSFET product lines on the market.
Cmsemicon MCU is a microcontroller company born in Shenzhen, with rich product types and technology research and development experience.
Becoming a global high-value agent is the common goal pursued by OLUKEY Industrial employees. We adhere to the corporate values of "Pragmatism, Win-win, Service and Responsibility", continue to strengthen service quality, and aim to provide high-quality services. Work hand in hand with suppliers to jointly explore a larger market and contribute to the prosperity and development of semiconductors.
Deploying robust power semiconductor nodes across diverse high-stress operating environments.
In-vehicle USB-C PD charging ports face severe electrical noise, voltage spikes, and high temperatures. Our high-voltage 100V N-channel MOSFETs (like the DFN5x6 models) offer robust avalanche ruggedness (EAS) to protect circuits from system transients, meeting tough automotive testing criteria.
Modern data centers and telecom power hubs depend on efficient point-of-load (PoL) modules. Using low RDS(on) N-channel switch networks decreases power loss at the board level, directly lowering cooling costs and enhancing environmental efficiency.
For small, enclosed smart home controllers and smart plugs, heat management is the main challenge. Our compact SOT-23 and DFN3X3 packages enable highly compact designs without risking thermal runaway or early component failures.
Expert insights on replacement validation, parameters, and supply management.
Conduction loss in a MOSFET is directly proportional to its RDS(on) multiplied by the square of the current ($P = I^2 \times R_{DS(on)}$). In fast chargers with high current levels (e.g., 5A in 100W/240W systems), even minor increases in resistance cause significant heat generation. Using low-RDS(on) components keeps the charger cool and maintains its compact, portable form factor.
Winsok MOSFETs offer drop-in replacement capabilities (pin-to-pin, footprint-compatible, and electrically equivalent) for major international brands. This allows procurement managers to establish secondary sourcing channels, lowering risks from single-supplier bottlenecks, export controls, or unexpected production delays.
DFN5X6 packages have lower thermal resistance ($R_{\theta JC}$) and support higher drain currents, making them ideal for high-power synchronous rectification. DFN3X3 packages are optimized for space-constrained circuits like sub-65W adapters and auxiliary power rails, balancing footprint size with thermal performance.
Cmsemicon MCUs run the USB-PD protocol stack, negotiating voltage and current profiles with connected devices. Once a profile is established, the MCU manages the PWM control signal. The gate driver uses this signal to control the Winsok MOSFETs, ensuring stable, safe, and highly efficient power delivery.
Every batch of parts undergoes comprehensive automated optical inspection (AOI), electrical parametric testing, and wafer-level testing. Additionally, periodic reliability stress testing (HTRB, HTGB, and thermal shock) is performed to ensure the components perform reliably under continuous high-load operations.
Complete power management inventory including medium-voltage switches, microcontrollers, and dual-channel arrays.
Olukey
