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These are some of the most commonly used words and terms when talking about the layout, manufacture or assembly of the printed circuit board.


A

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

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B

Barrel This is the term for the walls of the plated hole

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C

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D

Dry Film Solder Mask

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E

ENIG Electroless Nickle Immersion Gold
ENIPIG Electroless Nickle, Immersion Palladium, Immersion Gold

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F

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G

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H

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
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

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K

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L

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 on 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, silk screens, solder masks

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M

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N

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P

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

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S

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.

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W

wirewrapWirewrap 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. 

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Y

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Z

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