What is Vcc, Vss, Vdd, Vee in Electronics? Differences and Full Forms

You may notice electronic ICs have these pins Vcc, Vss, Vdd, Vee. Some ICs have Vcc and GND, some have Vdd and Vss, and some have Vcc and Vee. Now the question is what is the full form or meaning of these pins and why different names are used for different ICs. You may also notice, in electronic circuits, these names are used with their power supply terminals. So, let's know why different names are used.

Full Forms of Vcc, Vss, Vdd, Vee

Vcc = Voltage Collector Collector

Vdd = Voltage Drain Drain

Vss = Voltage Source Source

Vee = Voltage Emitter Emitter

GND = Ground

Now you may think why there is double terms are used such as Collector Collector, Drain Drain, etc.

These double terms refer to the particular pin connected to the many transistors, not to a single transistor. For example, the Vcc is not connected only to a single transistor, it is connected with many transistors.

What is Vcc, Vss, Vdd, and Vee?

Vcc and Vdd are the positive supply voltage to an IC or circuit.

Vss and Vee are the negative supply voltage to an IC or electronic circuit.

Why different names are used?

We know that BJT(Bipolar Junction Transistor) has three terminals named as Emitter, Base, and Collector.

FET(Field Effect Transistor) also has three terminals named as Gate, Drain, and Source.

So when an electronic circuit or IC is made using Bipolar Junction Transistors then the supply voltage pins are denoted as Vcc and Vee

Vcc refers to the supply voltage pin that is connected to the collector of the transistors.

Vee refers to the supply voltage pin that is connected to the emitter of the transistors.

When an electronic circuit or IC is made using Filed Effect Transistors the supply voltage pins are denoted as Vdd and Vss

Vdd refers to the supply voltage pin that is connected to the drain of the transistor.

Vss refers to the supply voltage pin that is connected to the source of the transistor.

Supply Voltage	BJT (Bipolar Junction Transistor)	FET (Field Effect Transistor)
Positive Supply Voltage	Vcc	Vdd
Negative Supply Voltage	Vee	Vss

 Read Also:

• Why CPU has so many power supply pins (e.g. Vcc, Vss)?
• Why all Electronic Devices Works on DC not AC?
• Why Semiconductor does not obey Ohm's Law? Explained
• Why Diode used in Solar Panel, Relay and Soldering Iron?
• Why NPN Transistors are mostly used than PNP Transistors?

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