PCB Glossary(PCB专业术语全英解析)
玛丽莲梦兔
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2020年07月29日 22:40
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The intention of this glossary is to explain the most commonly used terms and abbreviations that come up in PCB documents and daily business transactions. This glossary is not complete by any means but intention is to cover the most usual ones. For more comprehensive view of PCB related technical terms, please see the IPC standard IPC-T-50, Terms and Definitions for Interconnecting and Packaging Electronics Circuits. There may be some individual mismatches between this glossary and IPC standard as this glossary tries to match closely to everyday language of our business.
AOI t
Automatic Optical Inspection, method of inspecting pattern of any layer in PCB
Aspect Ratiot
AR, relation of PCB thickness divided by nominal size of the plated hole, is related to the capability of drilling and plating
Buried viat
Mechanically drilled plated hole which starts and ends inside the PCB , for example via between layers 2 and 7 in some 8 layer PCB
BGAt
Ball Grid Array, commonly used surface mount package for ICs
CADt
Computer Aided Design, design of the circuitry and features of the PCB, outputs graphical data (Gerber files) or database (ODB++)
CAMt
PCB document checking and handling step and 1st process step in PCB manufacturing, checks and modifies customer files to PCB manufacturing documents
DSt
Double-sided PCB, has 2 conductive layers (Top and Bottom)
DDUt
Delivered Duty Unpaid, a delivery term where supplier takes care of transportation, see details in Incoterms 2010
EAUt
Estimated Annual Usage in pieces, usually forecasted by customer
ENIGt
Electroless Nickel Immersion Gold, metallic solderable surface finish for component contact areas and for mechanical contacts like keypad or spring loaded contact
ETt
Electrical Test, test for PCB electrical contacts
ETAt
Estimated Time of Arrival
ETDt
Estimated Time of Delivery
FCAtFree Carrier, a delivery term , for example FCA Oulu means that supplier in Oulu will give the goods to the transportation company organized by customer, see details in Incoterms 2010
Floor life
max allowable time between opening vacuum package and the soldering of the PCB (see also MSL)
FPCt
Flex PCB, designed and manufactured for flexible assembly or dynamic flexible application
FQCt
Final Quality Control
FR4t
FR= Flame Retardant, FR4 is one of UL classifications of most commonly used PCB dielectric material, mixture of epoxy resin and glass cloth (possibly also some fillers)
Gerbert
Commonly used format for PCB manufacturing files, most commonly extended gerber RS-274X, also sometimes used as a name of complete PCB file package (including also drawings, specification files, drill files, netlist and other necessary documents)
HASLt
Hot Air Solder Levelling, metallic solderable surface finish for component contact areas, consist of Sn-Ag (lead-free, such as CN100) or Sn-Pb (leaded)
HDIt
High Density Interconnection, a PCB having la
essing
PTFEt
PolyTetraFluoroEthylene, Teflon, dielectric material for some RF PCBs
PTHt
Plated Through Hole, a copper plated hole that connects PCB layers to each other, can be also for component assembly (component hole like pressfit hole)
PWBt
Printed Wiring Board, synonym to PCB (IPC defines a slight difference)
QCt
Quality Control
QFPt
Quad Flat Pack is a commonly used SMT IC package that has leads in all 4 sides
QTAt
Quick Turn-Around, express delivery, leadtime below standard leadtime
RCC, RCCut
Resin Coated Copper foil, dielectric for layers for laser drilling, max 75u thick, only epoxy resin (no glass)
RFQt
Request For Quotation
RoHSt
Restriction of Hazardous Substances, EU directive 2002/95/EC, resitricting the use of lead for example, RoHS compliant means that the part fullfills the RoHS directive and meet the leadfree soldering process requirements
Setup costt
see startup cost
Startup costt
One-time cost for a new revision of the PCB, covers the tooling and documentation cost, does not occur in repeat orders with the same revision of documents
SITt
Secondary Imaging Technology, combination of 2 different solderable surface finishes, typically combination of OSP and ENIG in the same PCB
Shelf lifet
Time that PCBs can be stored in none-opened vacuum package without compromizing use-ability of the product
SMt
Solder Mask, also solder resist, permanent coating material on PCB, covering the areas of PCB that will be not soldered (most commonly green, other colors also)
SMTt
Surface Mount Technology
SPCt
Statistical Process Control
Tooling costt
See startup cost
ULt
Underwriters Laboratory, a testing organisation for fire safety and classification of PCB like UL94V-0 (flammability and MOT ratings of PCB materials, technologies and manufacturers)
WD, working daytWorking day is an unit used to describe delivery time, it exludes days off like Saturday, Sunday and public holidays, for example 10wd means usually delivery time of 2 weeks (2x5 days/week)