Question
Which of the following component package types have the least parasitic effects at frequencies above the HF range?
Answer Options
- A) TO-220
- B) Axial lead
- C) Radial lead
- D) Surface mount
Correct Answer: D
Explanation
Parasitic effects—unwanted inductance and capacitance—are primarily introduced by the component’s leads and internal packaging structure. As frequency increases beyond HF, even small parasitics can severely degrade performance. Through-hole components like DIPs, axial, and radial leads all have relatively long lead lengths.
Surface mount components have the least parasitic effects at frequencies above the HF range. Since they are soldered directly onto pads on the PCB surface, they have extremely short or non-existent leads, minimizing parasitic series inductance (ESL) and unwanted shunt capacitance, making them essential for VHF, UHF, and microwave circuit design.
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