These are some of the most commonly used words and terms when talking about the layout, manufacture or assembly of the printed circuit board.
Annular Ring This is the amount of metal from the drill hole to the edge of the metal pad. Inner layer annular ring is measured from the edge of the material where the drill tool cut through to the edge of the pad. Outer layer annular ring is measured from the plated edge inside the hole to the edge of the pad including the finish platting wrap if any.
Au This is the symbol for Gold which is a chemical element that is highly conductive
AOI Automated Optical Inspection
Barrel This is the term for the walls of the plated hole
Bed of Nail Tester these test machines normally use fixtures and pins. These pins make contact with the machine and the circuit board being tested. There are machines for bare circuit board and loaded (assembled) circuit boards.
BGA Ball Grid Array is a type of surface mount chip carrier used for integrated circuits. It provides more interconnection pins than a flat package or a dual inline package.
Copper, when not tarnished, is a pinkish-orange color chemical element with the symbol Cu and atomic number 29, It is a soft metal with very high thermal and electrical conductivity had become the main choice for creating the conductive layer pathways (circuit paths) built into a circuit board
Core is the term used for the base material (dielectric) used in a circuit board it can be used for almost all material types
Dialectric, this is the base material that is used as an isolator between conductive layers (also known as a core)
Dry Film Solder Mask is of a non-conductive material that is applied as a solid film that is photoimagable. It is used to cover the conductive metal traces (normally copper) of a printed circuit board. Its main use is to prevent solder surface shorts between close features and to protect against oxidation. The common color is Green (flat or gloss)
ENIG Electroless Nickle Immersion Gold
ENIPIG Electroless Nickle, Immersion Palladium, Immersion Gold
Flying Probe Tester is a machine that tests the netlist by using several probes that move quickly from point to point.
Foil a thin layer of metal material like copper or aluminum it can be created by the rolled and annealed process or electrodeposited (ED copper)
HAL Hot Air Level, this is shiny (silver in color) finish of solder that is applied by a machine that dips the PCB panel into molten solder (lead or Leadfree) and leveled by high-pressure air being blown across the surfaces
HASL Hot Air Solder Level, this is shiny (silver in color) finish of solder that is applied by a machine that dips the PCB panel into molten solder (lead or Leadfree) and leveled by high-pressure air being blown across the surfaces
ICT (In-Circuit Test) these machines are very similar to the flying probe testers
LDI Laser direct imaging, this machine uses a laser to expose a resist or LPI product. in the older days, we used a Photo Image exposure unit to do the same thing but it was not nearly as accurate and didn't have the capability to auto-scale based on the product
Legend (Silk Screen) is the text letters and symbols that are printed on to the outside of printed circuit boards. It is used during the assembly process and by end-users (service persons) to help identify the components, test points, or other important markings. These markings may be part numbers, revisions, assembly numbers, company logos, warning symbols, date codes, and any other identification symbols. The legend can be printed or screened-in several colors like black, red, yellow, blue but the normal is still white.
LPI Liquid Photoimageable, nowadays this type of product is exposed using an LDI machine and is usually talking about resist masks, silkscreens, solder masks
Peelable Mask this is a great product when you need to temporarily cover something during PCB manufacture or Assembly. It is applied as a liquid but when it is dry you can just peel off and the surface below was protected
PWB Printed Wire Board
PCB Printed Circuit Board
PCBA Printed Circuit Board Assembly
SilkScreen see legend
Solder is a fusible conductive metal alloy (normally a combination of lead/Tin) used to create a permanent bond between metal pieces.
Solder Mask is a thin coating or film that is of a non-conductive material that is applied as an epoxy liquid (LPI & peelable) or solid (dry film photoimagable) to cover the conductive metal traces (normally copper) of a printed circuit board. Its main use is to prevent solder surface shorts between close features and to protect against oxidation. Common liquid colors available are the common Green (flat or gloss), or the specialty colors Blue, Red, Yellow, Black, and White.
Wirewrap Was invented to wire telephone crossbar switches and later adapted to construct electronic circuit boards in the 1960 and 1970s. The wire wrap is created by using a special tool or machine to tightly wrap a small gauge solid wire (30-28 gauge) around the sharp corners of a square connection post.