Question

In discrete transistors the substrate is normally used as

• A. Emitter
• B. Collector
• C. Base
• D. Bias supply

Hint:

In integrated and discrete transistor fabrication, the collector region is generally associated with the substrate because it occupies the largest area and dissipates the highest power.

Answer 1

The Correct Option is B

Concept: In transistor fabrication, the collector region occupies the largest physical area. The substrate is usually connected to the collector.

Step 1: Understand transistor structure.
A transistor consists of:
• Emitter
• Base
• Collector Among these, the collector dissipates the maximum power.

Step 2: Identify substrate connection.
To improve heat dissipation and fabrication convenience, the substrate is connected to the collector terminal.

Step 3: Write the answer.
\[ \boxed{\text{Collector}} \]