Why Vdd and Vss instead of Vcc and GND ?Muhammad Anowar Kabir2013-10-19T17:34:53+00:00 Home › Forums › Digital Electronics › Why Vdd and Vss instead of Vcc and GND ? This topic contains 1 reply, has 2 voices, and was last updated by Ligo George 4 years, 3 months ago. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts February 26, 2013 at 6:58 pm #7370 Muhammad Anowar KabirParticipant Why do we use Vdd and Vss in some ICs instead of Vcc and GND?:o February 26, 2013 at 7:04 pm #7386 Ligo GeorgeKeymaster Most of the ICs are manufactured using MOSFETs instead of BJTs. From the following definitions you can understand the difference.. For BJT >Vcc – Collector Voltage For MOSFET or FET >Vdd – Drain Voltage >Vss – Source Voltage Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic.