Recall & Review
beginner
What is the most common base material used in PCBs?
The most common base material used in PCBs is FR-4, a flame-retardant fiberglass epoxy laminate.
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beginner
Define copper weight in PCB manufacturing.
Copper weight refers to the thickness of the copper layer on a PCB, usually measured in ounces per square foot (oz/ft²).
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intermediate
Why is copper weight important in PCB design?
Copper weight affects current capacity, heat dissipation, and mechanical strength of the PCB traces.
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intermediate
What does a 1 oz copper weight mean in terms of thickness?
1 oz copper weight means the copper layer is approximately 35 micrometers (1.4 mils) thick.
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intermediate
Name two common PCB base materials besides FR-4.
Two common PCB base materials besides FR-4 are CEM-1 (composite epoxy material) and polyimide (used for flexible PCBs).
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What does FR-4 stand for in PCB materials?
✗ Incorrect
FR-4 is a flame retardant fiberglass epoxy laminate commonly used as PCB base material.
Copper weight in PCBs is usually measured in:
✗ Incorrect
Copper weight is measured in ounces per square foot (oz/ft²), indicating copper thickness.
Increasing copper weight in a PCB trace will:
✗ Incorrect
More copper thickness improves heat dissipation and current capacity.
A 2 oz copper weight means the copper thickness is approximately:
✗ Incorrect
2 oz copper weight is about 70 micrometers thick, double the 1 oz thickness.
Which PCB material is typically used for flexible circuits?
✗ Incorrect
Polyimide is used for flexible PCBs due to its flexibility and heat resistance.
Explain why copper weight matters in PCB design and how it affects performance.
Think about how thicker copper changes electrical and physical properties.
You got /4 concepts.
List common PCB base materials and describe one key characteristic of each.
Consider both rigid and flexible PCB materials.
You got /3 concepts.