Lithium Iron Phosphate (LiFePO4) battery systems have become the cornerstone of sustainable energy transition, widely adopted across electric vehicles (EVs), light electric vehicles (LEVs), telecommunication backup power, and utility-scale energy storage systems (ESS). As these applications push for higher energy density, faster charging rates, and unparalleled thermal stability, the pressure on Battery Management Systems (BMS) increases. Specifically, the power switch—traditionally dominated by power MOSFETs—needs to handle larger current spikes, deliver lower conduction losses, and perform with extreme reliability under high thermal stress.
A typical LiFePO4 cell operates at 3.2V, which means cells must be connected in series (e.g., 4S for 12V, 16S for 48V, or up to 200S+ for utility-scale applications). For protection switches, charging, and discharging channels, power MOSFETs act as the electronic gatekeepers. The safety, lifecycle, and efficiency of the overall battery pack depend heavily on the static and dynamic parameters of these MOSFETs. Manufacturers require devices with extremely low Drain-Source On-State Resistance ($R_{DS(ON)}$) to minimize heat dissipation and gate charges ($Q_g$) to decrease switching transitions, thereby eliminating hotspots that could compromise the safety of the LiFePO4 cells.
HONGKONG Olukey INDUSTRY CO., LIMITED is a leading solution provider focusing on the overall solution of electronic product components. Our portfolio centers on three main product lines: WINSOK MOSFETs, Cmsemicon MCUs, and customized PCBA circuit board solutions. We provide end-to-end support from component sourcing to firmware development and mass production.
At present, Olukey Industry's products are widely used in automotive electronics, military electronics, smart industry, new energy (including LiFePO4 battery packs), smart medical care, 5G communications, IoT devices, smart homes, and diverse consumer electronics. Relying on global general agent status with major original factories, we serve the Asia-Pacific region and global markets. We support manufacturers with advanced semiconductor components and comprehensive application-level support.
Global electronics manufacturers face constant supply chain challenges, including volatile lead times and obsolescence. In the power semiconductor market, relying on a single source for medium-to-low voltage MOSFETs poses a risk to manufacturing schedules. Large battery pack manufacturers (e.g., 48V 100Ah telecommunication backup power packs) must identify, validate, and secure alternative suppliers to maintain stable assembly lines.
WINSOK MOSFETs, distributed by Olukey Industry, offer drop-in replacements for standard parts from major manufacturers like AOS (Alpha & Omega Semiconductor), Potens Semiconductor, ON Semi, and Vishay. For example, parts like the WSD40120DN56G (40V, 120A, DFN5X6-8) replace high-current industry standards, matching or exceeding thermal performance and reducing unit costs. This second-sourcing flexibility helps procurement managers secure supply lines without re-designing PCBA layouts.
Validation of power semiconductors for high-reliability systems like LiFePO4 battery chargers and protection boards requires rigorous documentation and stress testing. To ensure reliability, Olukey Industry provides comprehensive data packages, including reliability reports, thermal resistance measurements, and cross-reference documentation. Each batch of WINSOK MOSFETs undergoes testing for static drain-to-source breakdown voltage, gate-body leakage current, and thermal cycle durability.
We provide global engineers with early access through a dedicated free-sample program. By testing physical samples in native development environments, hardware designers can measure parameters like rise time, fall time, and case temperature under full load. This hands-on validation reduces design risk and speeds up time-to-market.
Over the years, our company has relied on reputation to survive, adhering to strict quality controls and establishing relationships with high-tech enterprises and manufacturers worldwide.
Leveraging the advantages of global general agents of major original manufacturers, we are based in the Asia-Pacific market. We offer effective resource integration and distribution services.
Covering voltages from 15V up to 650V, in packages including DFN3X3-8, DFN5X6-8, TO-252, TO-263, SOP-8, SOT-23, and TO-220 to meet diverse medium-and-low voltage design requirements.
WINSOK MOSFETs use trench gate geometries to achieve low on-resistance per unit area. This makes them suitable for battery safety circuits, where continuous current demands lead to significant conduction losses. By minimizing gate-to-drain charge ($Q_{gd}$) and input capacitance ($C_{iss}$), these MOSFETs switch rapidly, reducing energy dissipation during transitions.
| Voltage Range | Common Packages | Ideal LiFePO4 Configuration | Typical Applications |
|---|---|---|---|
| 15V - 30V | DFN3X3-8, SOP-8, SOT-23 | 1S - 4S (3.2V - 12.8V packs) | Handheld tools, portable power banks, consumer electronics BMS. |
| 40V - 60V | DFN5X6-8, TO-252, SOP-8L | 7S - 12S (24V - 36V packs) | Electric scooters, garden tools, light mobility battery packs. |
| 80V - 120V | DFN5X6-8, TO-220, TO-263 | 13S - 24S (48V - 72V packs) | E-bikes, telecom telecom backup ESS, industrial forklifts. |
| 150V - 300V | TO-220, DFN5X6-8 | 36S - 60S (High-voltage arrays) | Micro-grid energy storage systems, industrial UPS, solar battery setups. |
| 400V - 650V | TO-220F, TO-247 | High-voltage DC Bus protection | Electric vehicle charging stations, high-voltage battery test equipment. |
Our collaboration with Cmsemicon MCU allows us to offer integrated solutions. When paired with high-performance 8-bit or 32-bit Microcontrollers, our MOSFETs configure protection networks for overcharge, over-discharge, overcurrent, and short-circuit conditions. These designs meet safety certifications like UL 1973, IEC 62619, and UN38.3.
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