Discover high-efficiency power switches covering standard package configurations and low-to-medium voltage ranges, ideal for brushless DC (BLDC) controllers, battery management systems (BMS), and charging infrastructure.
Power MOSFETs used in e-bike replacements serve as the switching backbone of the motor controller (ESC) and the Battery Management System (BMS). Choosing the correct silicon specifications dictates safety, battery efficiency, and acceleration characteristics.
The power stage of an electric bicycle controller relies on high-efficiency switching topologies to drive Brushless DC (BLDC) or Permanent Magnet Synchronous Motors (PMSM). During phases of heavy load—such as climbing steep gradients or accelerating from a complete stop—the peak currents can surge to several times the nominal rating. If the MOSFET’s drain-to-source on-state resistance (RDS(on)) is too high, it leads to excessive I2R conduction losses, causing rapid thermal accumulation and eventual thermal runaway.
Furthermore, regenerative braking systems subject the switching devices to high voltage spikes. When the motor turns into a generator during braking, the MOSFET's body diode must handle reverse recovery transients (trr). Substandard replacement parts lack robust avalanche characteristics (EAS), making them prone to destruction under sudden voltage stresses. Working with a dedicated OEM power MOSFET distributor ensures you get components that are factory-tested for high avalanche ruggedness.
In Battery Management Systems, MOSFETs function in static safety configurations (charge and discharge switches). Here, low gate charge (Qg) is less critical than having an ultra-low RDS(on) and a highly robust Safe Operating Area (SOA). Because these switches run continuously, any slight resistance penalty directly degrades the e-bike’s driving range.
Olukey Industry supplies advanced WINSOK MOSFETs that balance gate charge, low conduction resistance, and high package dissipation limits. By replacing legacy components with optimized packaging like DFN5X6-8 or TO-263-2L, repair facilities and factory assemblers can significantly reduce field return rates.
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.
Leveraging strategic partnerships with leading original device manufacturers (ODMs) and state-of-the-art packaging facilities, we guarantee stable component supplies and high compatibility replacements.
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.
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.
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, we have become one of the outstanding and fast-growing agents in the Asia-Pacific region. The company has many years of professional distribution experience.
How global e-bike brands and fleet maintenance networks mitigate risk, secure inventory, and achieve premium thermal performance through direct mainland sourcing.
Shenzhen and the wider Pearl River Delta contain the world’s most dense concentration of light electric vehicle designers, engineers, packaging houses, and component distributors. This proximity enables Olukey Industry to offer rapid iterations on design, packaging, and raw materials. For global enterprises looking to optimize their cost-to-performance ratio, sourcing directly from verified suppliers provides access to cutting-edge technology such as trench-gate field-stop (TGFS) designs and Super-Junction (SJ) MOSFETs.
This integrated supply chain eliminates excessive distribution markups, giving you premium components that meet or exceed Western semiconductor standards at a fraction of the cost.
Enterprise procurement departments demand traceability, reliability, and long-term product lifecycles to prevent production line shutdowns. Olukey Industry mitigates these risks by offering:
Ensuring global standards compliance while providing localized logistics and technical support directly to regional engineers.
Our factory partners enforce strict green packaging practices. Our complete line of MOSFETs conforms to RoHS (Restriction of Hazardous Substances) and REACH directives. These certifications are essential for OEMs marketing e-bikes in Europe, North America, and other regulated markets. Complete chemical composition sheets and material declaration certificates are available upon request.
Replacing older components often requires adjustments in gate drive circuits to prevent EMI problems or parasitic turn-on. Our local engineering teams help customers choose correct values for gate resistors (Rg) and snubber circuits. This FAE assistance speeds up product qualification and limits redesign iterations during replacement projects.
Through Olukey's distribution center in Hong Kong, we manage flexible stocking programs (such as safety stock and Kanban) to absorb unexpected demand shifts. We work closely with airfreight and express carriers to assure fast customs clearance and predictable delivery times globally.
Practical system positions where WINSOK MOSFETs and Cmsemicon MCUs provide reliable performance under real-world stresses.
In standard 36V and 48V electric bicycle drives, 6-switch inverter bridges switch the current to the motor stator windings. Using rugged N-channel MOSFETs (such as the WSF160N10 or WSK96N08) ensures low resistance and minimum switching losses during high-frequency pulse-width modulation (PWM), keeping the drive system cool even under high starting loads.
BMS circuits require continuous current handling with minimal voltage drops. Packaged components like the WSD30150DN56 (DFN5x6-8) offer very low thermal impedance from junction to case (RthJC), allowing safe charging and discharging control without needing bulky heat sinks.
Stepping down the high main battery pack voltage (36V-72V) to 5V or 12V for display clusters, headlights, and USB charge ports requires small, high-efficiency switches. Dual P-channel devices (like the WSD2075DN33) and complementary options are ideal for compact buck converters, reducing component count and board space.
Technical answers compiled by our engineering team to assist in selecting and maintaining power semiconductors.
Browse our wider catalog of low-to-medium voltage devices, offering packages from space-saving SOT units to robust TO power modules.
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