Types of Printed Wiring Boards


Dictionary of Engineering Terms
"A" "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"

Dictionary of Circuit Board Terms
'A' to 'Ge', 'Gr' to 'O', 'P' to 'R', 'S', 'T' to 'Z'

Printed Circuit Board Types;
These definitions classify the circuit board type into five groupings ordered by complexity.

Type 1. Type 1 printed wiring boards are usually single sided conductive pattern with no plating in the component holes (base material with metal foil on only one side). Both MIL-STD-275 and IPC-D-275 detail the default design parameter of type 1 printed wiring boards.

Type 2. Type 2 printed wiring boards are printed wiring boards with conductive patterns on both sides of the board (double sided). In addition, holes through the base material are plated with copper (plated-through holes) to connect the conductive patterns on both sides together. Both MIL-STD-275 and IPC-D-275 detail the default design parameter of type 2 printed wiring boards.

Type 3. Type 3 printed wiring boards are printed wiring boards with conductive patterns on the outer layers of the board and contains internal conductive layers (multilayer). In addition, holes through the base material are plated with copper (plated-through holes) to connect the conductive patterns, external and internal, together. Both MIL-STD-275 and IPC-D-275 detail the default design parameter of type 3 printed wiring boards.

Type 4. Multilayer rigid and flexible material combination (more than two conductor layers) with plated-through holes.

Type 5. Bonded rigid and flexible material combination (more than two conductor layers) with plated-through holes.





Military Specs:
MIL-PRF-31032 - Printed Circuit Board/Printed Wiring Board, General Specification

MIL-PRF-55110F - Printed Wiring Board, Rigid, General Specification

MIL-STD-275E - Printed Wiring for Electronic Equipment

MIL-STD-2118 - Flexible and Rigid-Flex Printed Wiring for Electronic Equipment Design Requirements

 
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