Automotive ASFETs for Repetitive Avalanche
Guaranteed repetitive avalanche performance, automotive qualified
When using MOSFETs to power inductive loads such as driving solenoids, most circuit designs include additional components to protect the MOSFET when the load current continues to flow during switch off. This can range from highly efficient but expensive boost topologies that reuse the energy, to the less efficient but more cost-effective approach of using a freewheeling diode. The simple alternative option of a repetitive avalanche set-up has historically only been possible using planar technology. By optimizing MOSFETs to comfortably handle repetitive avalanche currents while maintaining a junction temperature below 175 °C, Nexperia offers a truly rugged device that delivers numerous system level savings.
ASFETs for Power over Ethernet (PoE)
Enhanced SOA, enhanced protection, low RDS(on), and superior power density
The latest high-power 48V Power over Ethernet standard (IEEE 802.3bt) and proprietary approaches are enabling the next generation of PoE systems. Such systems can deliver up to 100 W to each powered device, including large screen LCD displays, 5G pico-cells, advanced Wi-Fi hot-spots and pan-tilt-zoom CCTV cameras. This places increased demands on PoE power sourcing equipment (PSE). Demands that are matched by Nexperia’s dedicated PoE MOSFET family.
ASFETs for Hotswap and Soft Start
Reliable linear mode, enhanced SOA and low RDS(on)
Whether it is in the cloud or at the edge, we truly live in a 24/7 world. So much of our daily lives depend on rack-based computers, communications and storage systems that are always-on. Ensuring these systems do not experience any power disruption and to protect the components on replacement boards when they are inserted into a live system, it is essential that in-rush current is carefully controlled. In normal MOSFETs, strong SOA and low RDS(on) are mutually exclusive. Offering both capabilities in a single device, Nexperia’s specific MOSFETs for Hotswap and Soft Start are optimized for a non-stop world.
ASFETs for Battery Isolation
Strong SOA, robustness and maximum current
The majority of today’s handheld and battery powered tools and equipment are reliant on multi-cell lithium-ion battery packs. Li-ion batteries have the advantage of high energy density. However, in a fault condition this can become problematic with the potential for a massive uncontrolled energy discharge, resulting in over-heating of loads and potential circuit fires. To handle any significant discharge in a controlled manner until the battery is safely isolated and the system switched-off, requires an extremely robust and thermally efficient MOSFET. An ideal application for Nexperia’s toughest LFPAK housed devices.
Automotive ASFETs for Airbag Applications
Enhanced SOA for improved linear mode performance
When choosing a MOSFET to regulate the supply voltage to the squibs in an airbag system, the choice has traditionally been limited to older generations of silicon technology, such as the legacy wire-bonded DPAK package. This is due to the safe operating area (SOA) being greater for trench technologies with wider cell pitch when operating in linear mode. The MOSFET must be able to handle a current proportional to the number of squibs in the system, whilst regulating their supply voltage for long enough to activate the airbags. Nexperia have designed a range of Application Specific MOSFETS (ASFETs) to address the specialised needs of airbag applications, focused on enhanced SOA performance for improved linear mode.
