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PCB Workshop Michael Hwang m-hwang@northwestern.edu 2/13/2008 Terminology PCB: Printed Circuit Board mil: 1/1000 inch thou: same as mil pitch: Spacing between components (e.g. pins on an IC package) Reflow/wave soldering: industrial methods for mass-production soldering Terminology

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pcb workshop

PCB Workshop

Michael Hwang

m-hwang@northwestern.edu

2/13/2008

terminology
Terminology
  • PCB: Printed Circuit Board
  • mil: 1/1000 inch
  • thou: same as mil
  • pitch: Spacing between components (e.g. pins on an IC package)
  • Reflow/wave soldering: industrial methods for mass-production soldering
terminology3
Terminology
  • track/trace: Copper “wires” on the board connecting components.
  • pad: Exposed copper on which you can solder things. Thru-hole pads often act like vias.
  • via: A hole in the board that is plated on the inside. Used to connect tracks on different layers of a board.
  • silkscreen: Print legend on PCB
  • soldermask: insulating coating that protects covered parts from solder. Mandatory for fine-pitch wave/reflow soldering
terminology4
Terminology
  • Thru-hole components: components with leads that go through the circuit board and get soldered on the other side.
  • Surface-mount (SMD/SMT) components: Components that are meant to be soldered on the same surface on which it is mounted (these are usually smaller and harder to solder).
6 layer pcb cross section
6-layer PCB cross section

Track

Pad

Insulator

(e.g. Fiberglass laminate)

Via

slide6
Tips:
  • Use snap grid to keep components at regular intervals
  • Keep tracks neat
  • Use large tracks when possible, no smaller than 10 mils.
  • Keep at least 10 mils between tracks
  • Put prototyping area in empty space
  • Add test points
avoid loops
Avoid loops

Good:

Bad:

Loop picks up noise from magnetic fields.

bypass capacitors
Bypass Capacitors

V+

0.01-0.1 uF

traxmaker
Traxmaker
  • Abandoned
  • Graphics bugs
  • Stability bugs (save and backup often!)
  • Some moves can’t be undo-ed
    • Duplicate, place component, etc.
advanced circuits student discount
Advanced Circuits Student Discount
  • http://www.4pcb.com/index.php?load=content&page_id=134
  • No minimum order for “33 each” offer, enter “Student” in comments section when ordering.
  • Single-part orders only, so connect all parts, then saw after they arrive.
sources
Sources:
  • Jones, David L. PCB Design Tutorial Rev.A. http://alternatezone.com/electronics/pcbdesign.htm