Print Page | Close Window

Standard Reference Designators

Printed From: PCB Libraries Forum
Category: Libraries
Forum Name: PCB Libraries Guideline
Forum Description: (online edition)
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=3695
Printed Date: 03 Sep 2026 at 2:43pm


Topic: Standard Reference Designators
Posted By: Nick B
Subject: Standard Reference Designators
Date Posted: 20 Aug 2026 at 11:00am
ASeparable AssemblyLSLoudspeaker, Buzzer
ARAmplifierMMeter
ATAttenuator; IsolatorMGMotor-Generator
BBlower, MotorMH*Mounting Hole
BTBatteryMKMicrophone
CCapacitorMPMechanical Part
CBCircuit BreakerPConnector, Plug, Male
CPConnector Adapter, CouplingPSPower Supply
CNCapacitor NetworkQTransistor
CRBreakdown DiodeRResistor
DDiodeRNResistor Network
DCDirectional CouplerRTThermistor
DLDelay LineRVVaristor, Variable Resistor
DSDisplay, LampSSwitch
ETerminalTTransformer
FFuseTBTerminal Board, Terminal Strip
FD*FiducialTCThermocouple
FLFilterTP**Test Point, In-circuit Test Points
GGenerator, OscillatorTZTranszorb
GNGeneral NetworkUInseparable Assembly, IC Pkg.
HHardwareVRVoltage Regulator
HYCirculatorWWire, Cable, Cable Assembly
JConnector, Jack, FemaleXFuse holder, Lamp holder, Socket
KContactor, RelayYCrystal, Oscillator
LCoil, Inductor, Bead, Ferrite BeadZMiscellaneous

*These class letters would not appear in a parts list as they are part of a PCB and not an active electronic component.

**Not a class letter, but commonly used to designate test points for maintenance purposes.

Note: The above list is not exhaustive. See the standard list of class designation letters in ANSI Y32.2/IEEE Standard 315.



FOOTPRINT EXPERT GUIDELINE Topics
https://www.pcblibraries.com/forum/terms-and-definitions_topic3672.html" rel="nofollow - Terms & Definitions         https://www.pcblibraries.com/forum/component-descriptions_topic3673.html" rel="nofollow - Component Descriptions         https://www.pcblibraries.com/forum/threetier-density-levels_topic3674.html" rel="nofollow - Three-Tier Density Levels
https://www.pcblibraries.com/forum/ipc7352-mathematical-model_topic3675.html" rel="nofollow - IPC-7352 Mathematical Model        Solder Joint Goal Tables: [ https://www.pcblibraries.com/forum/surface-mount-solder-joint-goal-tables-min-max_topic3676.html" rel="nofollow - Min/Max ] [ https://www.pcblibraries.com/forum/solder-joint-goal-tables-for-nominal-calculation_topic3677.html" rel="nofollow - Nominal ]
https://www.pcblibraries.com/forum/manufacturer-recommended-patterns_topic3678.html" rel="nofollow - Manufacturer Recommended         https://www.pcblibraries.com/forum/throughhole-terminals_topic3679.html" rel="nofollow - Through-hole Terminals         https://www.pcblibraries.com/forum/courtyard-excess_topic3680.html" rel="nofollow - Courtyard Excess
https://www.pcblibraries.com/forum/pcbl-footprint-naming-convention-surface-mount_topic3681.html" rel="nofollow - PCBL Footprint Convention: SM        IPC-7352 Naming Convention: [ https://www.pcblibraries.com/forum/ipc7352-footprint-naming-convention-throughhole_topic3682.html" rel="nofollow - Footprint TH ] [ https://www.pcblibraries.com/forum/ipc7352-pad-stack-naming-convention_topic3685.html" rel="nofollow - Pad Stack ]
https://www.pcblibraries.com/forum/oda-pad-stack-naming-convention_topic3686.html" rel="nofollow - ODA Pad Stack Convention         https://www.pcblibraries.com/forum/terminal-lead-forms_topic3687.html" rel="nofollow - Terminal Lead Forms         https://www.pcblibraries.com/forum/pad-shapes_topic3688.html" rel="nofollow - Pad Shapes         https://www.pcblibraries.com/forum/design-units_topic3689.html" rel="nofollow - Design Units
https://www.pcblibraries.com/forum/fpx-file-definition_topic3690.html" rel="nofollow - FPX File Definition         https://www.pcblibraries.com/forum/smd-pad-stack-rules_topic3691.html" rel="nofollow - SMD Pad Stack Rules         https://www.pcblibraries.com/forum/drafting-outlines-polarity-marking_topic3692.html" rel="nofollow - Drafting Outlines & Polarity Marking
https://www.pcblibraries.com/forum/package-and-terminal-tolerances_topic3693.html" rel="nofollow - Package & Terminal Tolerances         https://www.pcblibraries.com/forum/zero-component-orientation_topic3694.html" rel="nofollow - Zero Component Orientation
https://www.pcblibraries.com/forum/standard-reference-designators_topic3695.html" rel="nofollow - Standard Reference Designators        Component Families: [ https://www.pcblibraries.com/forum/surface-mount-component-families_topic3696.html" rel="nofollow - Surface Mount ] [ https://www.pcblibraries.com/forum/throughhole-component-families_topic3697.html" rel="nofollow - Through-hole ]



The Footprint Expert automates footprints to perfection. Professional, detailed, and accurate parts - all built consistently with identical rules, regardless of how many people are involved in your library development.

Get your FREE Footprint Calculator or Footprint Expert Evaluation License:
 https://www.pcblibraries.com/Register" rel="nofollow - https://www.PCBLibraries.com/Register

Call us - 847-557-2300



-------------
Stay connected - follow us! https://twitter.com/PCBLibraries" rel="nofollow - X - http://www.linkedin.com/company/pcb-libraries-inc-/" rel="nofollow - LinkedIn


Print Page | Close Window