Explore our engineering-grade silicon transistors optimized for thermal efficiency, ultra-low $R_{DS(on)}$, and high avalanche durability in lithium battery packs.
HONGKONG Olukey INDUSTRY CO., LIMITED is an industry-leading solutions provider specializing in the comprehensive supply chain and developmental integration of advanced electronic components. Our enterprise portfolio features three primary, high-synergy product lines: WINSOK MOSFETs, Cmsemicon MCUs, and customized PCBA circuit board solutions.
Olukey Industry products serve critical applications in automotive electronics, military equipment, smart industrial controls, new energy storage systems, medical instrumentation, 5G networking infrastructure, the Internet of Things (IoT), smart home ecosystems, and high-performance consumer appliances. Relying on close collaboration with key global manufacturers, we operate as a crucial engineering bridge in the Asia-Pacific market and beyond, delivering premium semiconductor modules designed to elevate efficiency, stability, and product lifespan.
We leverage high-quality component curation and engineering solutions to assist battery pack manufacturers in bringing reliable products to market. Over the years, Olukey has established long-term cooperative partnerships with major high-tech enterprises and semiconductor foundries worldwide. We prioritize the foundational rule of "quality first, service first," ensuring that each product undergoes comprehensive parameters testing, lot control, and failure-mode analysis.
By integrating microcontrollers (MCUs) from Cmsemicon and trench-gate MOSFETs from WINSOK, we supply battery factories with ready-to-implement PCBA solutions. This reduces time-to-market and optimizes thermal performance for systems ranging from low-power consumer wearables to multi-kilowatt electric vehicle battery packs.
Analyzing key pain points and strategic requirements for procurement offices across primary battery assembly hubs.
Global manufacturers require pin-to-pin compatible alternatives to high-cost Western semiconductor brands. Our WINSOK portfolio provides drop-in compatibility, mitigating supply disruptions and optimizing BOM costs.
BMS modules routinely handle heavy continuous currents. Standardizing on low $R_{DS(on)}$ packages like TOLL-8L, DFN5x6-8L, and TO-263 reduces power loss and controls PCB thermal signatures.
Battery management systems are safety-critical. Component defects can lead to thermal runaway. OLUKEY utilizes strict testing procedures, ensuring low DPPM levels for high-reliability applications.
Designing optimized topologies for lithium battery protection requires matching the exact voltage and current demands of the target application.
These systems demand robust over-current protection and stable performance under continuous load. In the 36V to 72V battery range, switching transients can spike significantly. Our solution utilizes 80V and 100V N-channel MOSFETs (such as the WSR180N10 and WSM340N10G) housed in TO-220 or TOLL-8L packages. These provide low thermal impedance ($R_{thJC}$) and high avalanche resistance ($E_{AS}$), allowing the BMS to handle high-current acceleration surges and regenerative braking feedback without thermal failures.
For home power backups and industrial grids, efficiency dictates the overall round-trip performance of the system. Systems running at 48V, 96V, or higher series connections rely on continuous load efficiency. By deploying low $R_{DS(on)}$ DFN5x6-8L and TO-263 packaged MOSFETs in parallel, battery designers can minimize static power loss, reducing internal battery pack heating and extending the lifetime of the cells.
Mobile phones, smartwatches, and medical sensors prioritize board space and ultra-low quiescent current. Here, sub-30V MOSFETs in compact packages like SOT-23-3L, SOP-8, or DFN3x3-8 (such as the WST3400D or WSD3050DN33) are crucial. They protect the cell from overcharge, over-discharge, and external short circuits while keeping the BMS footprint within minimal design parameters.
Modern BMS designs combine power MOSFETs with microcontrollers to track parameters like State of Charge (SoC), State of Health (SoH), and cell balancing. By pairing Cmsemicon MCUs with WINSOK MOSFETs, Olukey provides a turnkey solution that processes sensor data in real-time, driving the gates of the protection MOSFETs to disconnect the pack during voltage anomalies.
Understanding how package style, voltage rating, and maximum current capabilities align to optimize reliability in different BMS environments.
| Voltage Range | Common Packages | Target Applications | Core Technical Benefits |
|---|---|---|---|
| 15V - 30V (Low V) | SOT-23, SOP-8, DFN3x3-8 | Smartphones, Wearables, TWS Earbuds, IoT Sensors | Ultra-small footprints, low gate threshold voltage ($V_{gs(th)}$), minimized parasitic capacitance. |
| 40V - 60V (Medium V) | DFN5x6-8, TO-252, SOP-8 | Power Tools, Vacuum Cleaners, E-Bikes (12V-36V systems) | High avalanche ruggedness, low gate charge ($Q_g$) for high-frequency switching, compact thermal footprints. |
| 80V - 150V (High Current) | TO-220, TO-263, TOLL-8L | Light Electric Vehicles, Telecom Backup Power, Solar ESS | Extreme current capability (up to 340A+), minimal package source inductance, low $R_{DS(on)}$ to prevent thermal runaway. |
| 200V - 650V (High V) | TO-220, TO-263, DFN5x6-8 | High-Voltage Battery Arrays, EV Charging Stations, UPS Systems | High drain-source breakdown voltage, robust transient overvoltage immunity, optimized Safe Operating Area (SOA). |
In high-cell-count battery packs, the MOSFETs are typically placed in the common-ground return path (low-side configuration) or the positive power rail (high-side configuration). For high-side switching, driving the gate requires a charge pump or dedicated high-side driver to exceed the battery voltage by 10V. When using N-channel MOSFETs in these configurations, engineers must account for the gate-source voltage ($V_{gs}$) parameters:
Olukey Industry operates with structured supply chain and quality validation processes. All semiconductor components, including WINSOK MOSFETs and Cmsemicon microcontrollers, are manufactured in state-of-the-art foundry partners certified under ISO 9001:2015 and IATF 16949 quality management systems.
Our products comply with global standards, including RoHS and REACH directives, ensuring that battery packs built with our components meet environmental and safety regulations in Europe and the Americas. Additionally, we provide localized engineering and Field Application Engineering (FAE) support to assist clients from the initial prototyping phase through to mass assembly troubleshooting.
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