CFD4448 High-Speed Switching Diode Central Semiconductor CFD4448 High-Speed Switching Diode features an extremely fast switching speed of 4ns max and a continuous forward voltage of 250mA. This surface-mount device is available in a very small, low-profile leadless SOD-882L package. The CFD4448 is an ultra high-speed switching diode ideal for applications that require very small size and operational efficiency. Central Semiconductor CFD4448 diode is useful in battery-powered applications such as cell phones, digital cameras, laptop computers, and more.