PCB Design Glossary
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Light Emitting Diode. These are devices that convert electrical energy into light.
Pure substances undergo phase changes at specific temperatures. Mixtures undergo phase changes over a range of temperatures. Liquidus is the temperature at which all solids have melted in a warming mixture.
The tops of printed circuit boards and the bottoms and sides of discrete components are often made of a variety of metals or are coated with a thin layer of a metallic compound to make the surface-layer conductive. These areas can then be soldered or further processed.
Microchip Technologies is an electronic component manufacturer based in North America. Among their very popular offerings is the Atmel328P, the main microcontroller in the Arduino.
Minimum Order Quantity
The minimum order quantity is the absolute lowest number of parts that can be ordered at a time. Below this quantity, the manufacturer or distributor's profit margins are so low, it doesn't make sense to invest employee time or company resources to sell the item.
A net is a network of pads, traces, and copper pours that are electrically connected. The theoretical resistivity of a net is zero. Nets can extend from layer to layer through vias, but nets do not extend through components.
Printed Circuit Boards are made from sheets of material that comes in standard sizes of 12" x 18", 18" x 24", or 24" x 36". To keep manufacturing costs down, multiple printed circuit boards are combined on a panel during fabrication.
The entire panel is not available for usable space. A 1" margin is used for tooling and test coupons.