Why are DIP through-hole package ICs not typically used at UHF and higher frequencies?
The correct answer is C: Excessive lead length. Why are DIP through-hole package ICs not typically used at UHF and higher frequencies is excessive lead length. Long leads create too much inductance at UHF. For amateur radio operators, this is important for RF circuit design. Understanding this helps when selecting components.
Exam Tip
DIP not used at UHF+ = excessive lead length. Think 'D'IP at 'U'HF = 'D'oesn't 'U'se (excessive leads). Long leads create too much inductance at UHF. Not dielectric loss, not epoxy conductivity, not signal combining - just excessive lead length.
Memory Aid
"DIP not used at UHF+ = excessive lead length. Think 'D'IP at 'U'HF = 'E'xcessive 'L'eads. Long leads create too much inductance at UHF. Important for RF circuit design."
Real-World Application
DIP through-hole package ICs at UHF and higher frequencies: They're not typically used because of excessive lead length. The long leads create significant inductance at UHF, affecting performance. This is the reason - excessive lead length.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Excessive dielectric loss isn't the reason - excessive lead length is. Dielectric loss isn't the reason.
Option B: Incorrect. Epoxy coating being conductive above 300 MHz isn't the reason - excessive lead length is. Epoxy conductivity isn't the reason.
Option D: Incorrect. Unsuitable for combining analog and digital signals isn't the reason - excessive lead length is. Signal combining isn't the reason.
题目解析
The correct answer is C: Excessive lead length. Why are DIP through-hole package ICs not typically used at UHF and higher frequencies is excessive lead length. Long leads create too much inductance at UHF. For amateur radio operators, this is important for RF circuit design. Understanding this helps when selecting components.
考试技巧
DIP not used at UHF+ = excessive lead length. Think 'D'IP at 'U'HF = 'D'oesn't 'U'se (excessive leads). Long leads create too much inductance at UHF. Not dielectric loss, not epoxy conductivity, not signal combining - just excessive lead length.
记忆口诀
DIP not used at UHF+ = excessive lead length. Think 'D'IP at 'U'HF = 'E'xcessive 'L'eads. Long leads create too much inductance at UHF. Important for RF circuit design.
实际应用示例
DIP through-hole package ICs at UHF and higher frequencies: They're not typically used because of excessive lead length. The long leads create significant inductance at UHF, affecting performance. This is the reason - excessive lead length.
错误选项分析
Option A: Incorrect. Excessive dielectric loss isn't the reason - excessive lead length is. Dielectric loss isn't the reason. Option B: Incorrect. Epoxy coating being conductive above 300 MHz isn't the reason - excessive lead length is. Epoxy conductivity isn't the reason. Option D: Incorrect. Unsuitable for combining analog and digital signals isn't the reason - excessive lead length is. Signal combining isn't the reason.
知识点
DIP through-hole package ICs, Not typically used, UHF and higher frequencies, Excessive lead length
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.