Lead Mounting Hole

See Component Hole.

Lead Mounting Hole

Lead

(Pronounced “Leed”)-A terminal on a component.

Lead

LCCC

Leadless ceramic chip carrier.

LCCC

Layer

One in a series of levels in a board on which tracks are arranged to connect components. Vias connect tracks and zones between layers.

Layer

Layer-to-Layer Spacing

 The thickness of dielectric material between adjacent layers of conductive circuitry in a multi-layer printed circuit board.

Layer-to-Layer Spacing

Laser

Light Amplified by Stimulated Emission of Radiation.

Laser

Landless Hole

A plated through-hole without a land(s).

Landless Hole

Land

On a PCB, the conductive area(s) to which components are attached. Also called pad.

Land

Land Pattern

A combination of lands that is used to mount, interconnect and test a particular component.

Land Pattern

Lamination

The process of manufacturing a laminate; also the process used for application of a dry film photo-resist.

Lamination

Laminate Presses

Multi-layer equipment that applies both pressure and heat to laminate and prepreg to make multi-layer boards.

Laminate Presses

Laminate Void

Absence of laminate material in an area which normally contains laminate material.

Laminate Void

Laminate Thickness

Thickness of the metal clad base material, single- or double-sided, prior to any subsequent processing.

Laminate Thickness

Laminate

A product made by bonding together two or more layers of material.

Laminate

Keyway

A slot used to assure the correct location in a mating connector.

Keyway

Keying Slot or Polarizing Slot

A slot in a printed circuit board that polarizes it, thereby permitting it to be plugged into its mating receptacle with pins properly aligned, but preventing it from being reversed or plugged into an...

Keying Slot or Polarizing Slot

Key

A device designed to assure that the coupling of two components can occur in only one position.

Key

Kapton

Du Pont trade name for polyimide film.

Kapton

Just-in-time(JIT)

Minimization of inventory by supplying material and components to the production line directly before placement into the product.

Just-in-time(JIT)

Jumper

An electrical connection between two points on a printed board added after the intended conductive pattern is formed.

Jumper

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