Switching and Linear application DC and VHF Amplifier applications. Collector to Emitter Voltage : Vceo = 400 Vħ. Low Power Bipolar Transistors 06/04/06 V1.0 Features: NPN Silicon Planar Switching Transistors. Collector to Base Voltage : Vcbo = 700 VĢ. DD127D, 3DD127D is a silicon NPN power switching transistor, which uses a planar process, a partial pressure ring terminal structure and a few child life control technology, integrated active anti-saturation network, improve the product breakdown voltage, switching speed and reliability.ġ.