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MCL Bootcamp PPT 4 - PCB Materials laminates properties

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MCL Bootcamp PPT 4 - PCB Materials laminates properties

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PCB Materials laminates properties
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1. What is the role of the base material in a PCB?
Provides electrical conductivity Supports only surface-mount components Provides mechanical support and insulation Acts as a heat sink
2. Why is epoxy the most commonly used resin in PCBs?
It is transparent It enhances electrical conductivity It balances performance, cost, and thermal properties It has the highest melting point
3. What is the purpose of prepreg in laminate construction?
Acts as a final coating Provides electrical pathways Binds layers before curing Functions as the solder mask
4. Which of the following is NOT a common property evaluated when selecting PCB resins?
Optical clarity Chemical resistance Mechanical strength Thermal performance
5. Why is copper preferred as the conductive foil in PCBs?
It is non-reactive It offers strong magnetic properties It is low cost and highly conductive It has a high dielectric constant
6. What is the dielectric constant (K) a measure of?
The rate of thermal expansion The mechanical toughness of a material The ability of a material to store electrostatic energy The thickness of the laminate
7. Which prepreg material is most commonly used in the PCB industry?
FR-1 FR-2 FR-4 CEM-3
8. What does a high dissipation factor in a laminate indicate?
High heat resistance Low electrical loss High inefficiency in insulation Strong mechanical performance
9. What is the significance of glass transition temperature (Tg) in PCB materials?
It marks the onset of chemical degradation It determines how well a PCB absorbs moisture It indicates the temperature where the resin becomes conductive It defines when the material softens from glassy to rubbery
10. Why are aluminum core boards used in certain applications?
For wireless signal shielding To allow flexibility in the PCB For efficient heat dissipation To reduce weight