Electronics Circuit Abbreviations — Quick Reference
Power Rails & Supply
VCC, VDD — Positive supply voltage
VSS, GND — Ground
VEE — Negative supply
VBAT — Battery voltage
VIN, VOUT — Input/Output voltage
VREF — Reference voltage
VPP — Programming voltage
AVCC, AVDD, AGND — Analog supply/ground
DVDD, DGND — Digital supply/ground
PVDD, PGND — Power stage supply/ground
VALW, 3VALW — Always-on rail (laptops)
VSB, 3VSB, 5VSB — Standby rail (desktops)
VCORE — CPU core voltage
VTT — Termination voltage (RAM)
VCCP — Processor I/O voltage
VCCSA — System Agent voltage
VCCIO — I/O voltage
VSOC — SoC/uncore voltage
VID — Voltage ID
VRM — Voltage Regulator Module
PMIC — Power Management IC
LDO — Low Dropout regulator
Control & Status Signals
CLK — Clock
RST, RESET# — Reset (active-low)
EN — Enable
CS, CS# — Chip Select
WE# — Write Enable
OE# — Output Enable
INT, IRQ — Interrupt
RDY, BUSY — Ready / Busy
PWR_BTN# — Power button signal
PWR_OK, PGOOD — Power Good
PS_ON# — Power Supply On (ATX)
SLP_S3#, SLP_S4#, SLP_S5# — ACPI sleep states
OC# — Over Current
UV, OV — Under/Over Voltage protection
THERM#, THRM# — Thermal alert
ALERT# — Fault interrupt
Communication Interfaces
I2C — SDA/SCL lines
SPI — MOSI/MISO/SCK/CS
UART — TX/RX
USB — D+/D−, VBUS
PCIe — TX/RX differential pairs
SATA — TX±/RX±
JTAG — TDI/TDO/TCK/TMS/TRST
LVDS — Display signaling
HDMI/DP — TMDS lines, HPD
CAN — CAN_H/CAN_L
SMBus — System Management Bus
Passive Component Labels
R — Resistor
C — Capacitor
L — Inductor
D — Diode
Q — Transistor
U — IC
Y, X, Z — Crystal/Oscillator
F — Fuse
J, CN — Connector
SW — Switch
LED — Light Emitting Diode
TP — Test Point
FB — Ferrite Bead
TVS — Transient Voltage Suppressor
IC/Chip Abbreviations
EC — Embedded Controller
SIO — Super I/O
BIOS/UEFI — Firmware
RTC — Real-Time Clock
MCU — Microcontroller
MOSFET — Metal-Oxide-Semiconductor FET
BJT — Bipolar Junction Transistor
OPAMP — Operational Amplifier
ADC, DAC — Analog↔Digital Converter
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