Difference between VCC, VEE, VDD, and VSS

The meanings and differences of V_CC, V_EE, V_DD, and V_SS used in the supply voltage are shown below.

• V_CC
  • V_CC is used as the positive supply voltage for circuits using a bipolar transistor (BJT).
  • The "C" in "V_CC" stands for Collector.
  • It is widely believed that the reason for repeating "V_CC" and "C" twice is to distinguish it from the collector voltage V_C.

V_CC is used as the positive supply voltage for circuits using a bipolar transistor (BJT).

The positive supply voltage on the collector side of the NPN bipolar transistor is "V_CC". The collector terminal of an NPN bipolar transistor is often connected directly to V_CC or V_CC through a resistor or other means.

The "C" in "V_CC" stands for Collector. It is widely believed that the reason for repeating "V_CC" and "C" twice is to distinguish it from the collector voltage V_C.

Circuits that use multiple positive supply voltages are often represented by different supply voltages, such as "V_CC1, V_CC2, …".

V_CC is also used as the positive supply voltage for operational amplifiers, whose main elements that make up the internal circuit are bipolar transistors, and for TLL (Transistor-transistor logic).

• V_EE
  • V_EE is used as a negative supply voltage for circuits that use a bipolar transistor (BJT).
  • The "E" in "V_EE" stands for Emitter.
  • It is widely believed that the reason for repeating "V_EE" and "E" twice is to distinguish it from the emitter voltage V_E.

V_EE is used as a negative supply voltage for circuits that use a bipolar transistor (BJT).

The negative supply voltage on the emitter side of the NPN bipolar transistor is "V_EE". The emitter terminal of an NPN bipolar transistor is often connected directly to V_EE or V_EE through a resistor or other means. In the case of a single power supply system, "V_EE" is at the same potential as the ground.

The "E" in "V_EE" stands for Emitter. It is widely believed that the reason for repeating "V_EE" and "E" twice is to distinguish it from the emitter voltage V_E.

Circuits that use multiple negative supply voltages are often represented by different supply voltages, such as "V_EE1, V_EE2, …".

V_EE is also used as the negative supply voltage for operational amplifiers, whose main elements that make up the internal circuit are bipolar transistors, and for TLL (Transistor-transistor logic).

• V_DD
  • V_DD is used as the positive supply voltage for circuits that use a field-effect transistor (FET).
  • The "D" in "V_DD" stands for Drain.
  • It is widely believed that the reason for repeating "V_DD" and "D" twice is to distinguish it from the drain voltage V_D.

V_DD is used as the positive supply voltage for circuits that use a field-effect transistor (FET).

The positive supply voltage on the drain side of the N-channel field-effect transistor (NchFET) is "V_DD". The drain terminal of an N-channel field-effect transistor (NchFET) is often connected directly to V_DD or V_DD through a resistor or other means.

The "D" in "V_DD" stands for Drain. It is widely believed that the reason for repeating "V_DD" and "D" twice is to distinguish it from the drain voltage V_D.

Circuits that use multiple positive supply voltages are often represented by different supply voltages, such as "V_DD1, V_DD2, …".

V_DD is also used as the positive supply voltage for operational amplifiers, whose main elements that make up the internal circuit are field-effect transistors, and for CMOS(Complementary MOS).

Supplement

• V_SS
  • V_SS is used as the negative supply voltage for circuits that use a field-effect transistor (FET).
  • The "S" in "V_SS" stands for Source.
  • It is widely believed that the reason for repeating "V_SS" and "S" twice is to distinguish it from the source voltage V_S.

V_SS is used as the negative supply voltage for circuits that use a field-effect transistor (FET).

The negative supply voltage on the source side of the N-channel field-effect transistor (NchFET) is "V_SS". The source terminal of an N-channel field-effect transistor (NchFET) is often connected directly to V_SS or V_SS through a resistor or other means. In the case of a single power supply system, "V_SS" is at the same potential as the ground.