What is GND and VCC in a circuit?

What is GND and VCC in a circuit

What is GND and VCC in a circuit?

Vcc stands for Voltage Common Collector. It is labeled with the “+” sign for NPN transistors chips containing bipolar devices. Devices with PNP design are labeled “-Vcc”.

GND is not minus here. GND means this pin is at zero voltage with respect to the power supply and ground plane of the circuit board.

So +Vcc needs to have a voltage above GND while -Vcc needs a voltage below GND.

Vcc is the common collector supply voltage for circuits based on NPN bipolar transistors, e.g. TTL logic circuits.

If you look at the pinouts of the common 74 series TTL chips, the supply voltage is referred to as Vcc.

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What is GND and VCC in a circuit
What is GND and VCC in a circuit?

You can also have Vee as the common emmiter voltage in place of Gnd or 0v.

You can also add various other power rail designations into the mix. For FET designs you also have Vdd (drain voltage) and Vss (source voltage).

The power pins on 4000 series CMOS chips are annotated as Vdd (drain) for the positive rail and Vss for the 0v/Gnd/common rail.

Vs is the often-used common designator for a generic source or supply voltage and V+ (or +V) and V- (or -V) are often used in split-rail op-amp designs.

GND can also be designated as 0v, or sometimes Com (Common) especially if the circuit isn’t actually grounded. Some circuits using mixed analogue and digital circuitry also designate separate supply and return lines for analogue and digital parts of a circuit.

If you had a logic based on PNP transistors (and this was very common before integrated circuits), your Vcc would have been negative with respect to 0v or GND.

What is GND and VCC in a circuit? Are they + pole (for VCC) and – pole (for GND)?

VCC is the higher voltage with respect to GND (ground). VCC is the power input of a device. It may be positive or negative with respect to GND, but most of the world runs on positive voltages like in a vehicle.

GND is normally at 0 (zero) volts or the zero voltage point for a power supply and circuit. The positive or negative supply outputs are above or below this zero volts.

In typical logic circuits, VCC is normally +5V meaning the devices VCC input is connected to +5V as the main power input pin. VG as it is sometimes called is ground, but mainly there is to be 5V between VCC and VG on the device.

Vcc is generally considered the path for transistor collector power. Gnd is the return path. Npn and pnp transistors can have their own Vcc, + and-.

Fet transistors get Vdd as drain power, analogous to collector power. And just to confuse everything, some people use Vcc as just general logic power. GND is always GND though 🙂

Allow me to answer your question using my poor knowledge:


VCC stands for “voltage at the common collector.” The letter “V” on a circuit stands for the supply voltage. The letters “CC” indicate that the supply voltage is positive or negative.

If the charge is positive, its circuit is a Negative-Positive-Negative circuit, and if negative, it is a Positive-Negative-Positive circuit.


GND is the reference point in an electrical circuit from which voltages are measured, a common return path for electric current, or a direct physical connection to the Earth.

I hope this helps.Please let me know if you need further clarification.

What is VCC voltage?

Vcc is usually the positive power supply voltage for transistorized or integrated circuit electronic systems.

Sometimes the voltages are also called Vdd (positive) and Vee and Vss (negative voltages) in relation to collectors, drains, emitters, and sources of BJT and FET transistor-based systems, but that’s probably more than you wanted to know.

Vcc is the voltage of the supply rail common to the collector of a bipolar transistor. It can be positive or negative depending on whether the transistor is PNP or NPN.

If it means about electronics, then it is VOLTAGE collector to collector.

(An electronics designation that refers to voltage from a power supply connected to the “collector” terminal of a bipolar transistor. In an NPN bipolar (BJT) transistor, it would be +Vcc, while in a PNP transistor, it would be -Vcc.

Double letters (cc) refer to power supply voltages. For example, Vee refers to the “emitter” voltage. In CMOS logic, Vss refers to the “source” voltage, and Vdd is the “drain” voltage.

Single letters refer to the voltage relative to ground; for example, Vc is the “collector” voltage relative to ground.

Two different letters indicate the voltage between two terminals; for example, Vbe is the “base” to “emitter” voltage drop, while Vce is the “collector” to “emitter” voltage.)

Other than VCC stands for

  • Vancouver Community College
  • Virtual Call Center
  • Victoria Christian College
  • Voice Call Communication
  • Video Call Communication
  • Virtual Circuit Connection
  • Volunteered Cadet Corps
  • Visual Communication Center
  • Veterinary Care Center
  • Visa Credit Cards
  • Ventilator Constructing Company, etc……

Must Read: What is RCBO

What is GND and VCC in a circuit
What is GND and VCC in a circuit?

What is meant by VCC and VEE?

There are basically two types of Transistors:

  1. Bipolar Junction Transistors (BJT)
  2. Field Effect Transistors

BJT’s have 3 terminals: Emitter, Base and Collector.

  • The VCC and VEE are the notations used for the voltages at various common voltage terminals.
  • VCC stands for Voltage at Common Collector that is the positive supply voltage.
  • VEE stands for Voltage at Common Emitter that is the negative supply voltage.
  • The TTL OCs (Transistor-Transistor Logic) are originally based upon BJT technology and these notations are used there.

Whenever a supply to the TTL is connected between collector and ground it is notified as VCC or positive supply voltage and if it is connected between emitter and ground it is notified as VEE or negative supply voltage and if it is connected between base and ground it is notified as VBB or base supply voltage.


Its the Negative return power terminal and the positive power terminal for a circuit. Somewhat arbitrary as the CC stands for collector voltage and that applies mainly to bipolar devices like TTL logic and sometimes analog.

Other common labels are Vdd, V+ +V, +5V, etc. GND can be GND AGND, DGND, COM, it not very well standardized.

But + pole and – pole?, I’ve never seen those terms used in my 44 years of electrical engineering.

In most cases, VCC connects to the positive pole of the power supply, and GND connects to the ground (negative) pole.

But on most schematic editors you can call it anything you like.

Almost all integrated circuits (ICs) have at least two pins that connect to the power rails of the circuit in which they are installed. These are known as the power-supply pins.

VCC simply refers to the positive supply voltage of one of the two power pins and VEE refers to the negative supply voltage of the other power pins.

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Voltage controlled capacitor is one method of making an LC oscillator vary its frequency in response to a control voltage. Any reverse biased semiconductor diode displays a measure of voltage dependent capacitance and can be used to change the frequency of an oscillator by varying a control voltage applied to the diode.

Special purpose variable capacitance, varactor diodes are available with well-characterized, wide-ranging values of capacitance. Such devices are very convenient in the manufacture of voltage-controlled oscillators.

For low-frequency VCOs, other methods of varying the frequency such as altering the charging rate of a capacitor by means of a voltage-controlled current source are used.

Vcc, Vdd, Vss, etc. Apparently this terminology originated in some way from the terminals of each type of transistor, and their common connections in logic circuits (i.e., Vcc is often applied to BJT collectors, Vee to BJT emitters, Vdd to FET drains, and Vss to FET sources).


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