power-supply pins (or power-supply terminals) are pins on integrated circuit packages that go to the die's common power rails.

Terms

While their usage varies from one manufacturer to another, most terms are more common to a specific technology. Some notable exceptions are known to exist, for example Intel used V_cc and V_ss to represent +5V and 0V on some of their chips.

BJT	FET						Description
Vcc	Vdd	V+	Vs+		+		Positive supply voltage
Vee	Vss	V-	Vs-	VGND	-	GND	Negative supply voltage

Double letters

The letter following the V is used to represent the voltage the power supply should be providing for that transistor's terminal (C for collector, D for drain, E for emitter, and S for source). For example V_cc means the voltage that should be delivered from the power supply to the collector. Note that this is different from V_c which means the voltage of the collector itself.

See also

• pinout
• not connected pin
• IC package