Components and PCB Assembly

Question 1

What are the 2 categories of components?

Answer 1

Passive:
- resistors
- capacitors
- inductors

Active: (Silicone, digital or analogue, receive or process signal).
- Diodes
- Transistors
- integrated circuits

Question 2

What are the physical parameters for active components?

Answer 2

• Complexity
• No pins

Question 3

What are the physical parameters for passive components?

Answer 3

Power characteristics:
More power = larger physical size

Question 4

Roughly how many components can a pack and place machine place?

Answer 4

12,000 + per hour

Question 5

What are the 2 types of secondary packaging used to prepare components for the pack and place machine?

Answer 5

Tape and reel.
Waffle pack.

Question 6

What type of secondary packaging is used to store resistors?

Answer 6

Axial through hole component -> supplied in bandolier.
Waste produced when legs are cut.

Question 7

What secondary packaging is used to supply through hole integrated circuits?

Answer 7

Supplied in tubes/sticks.
However some through hole components can be manufactured as SMT components.

Question 8

How does a pick and place machine accurately place components on a PCB?

Answer 8

A camera uses either the edge of the PCB or local fiducals (reference points on PCB) to align components.