JFET terminals: Does a junction field-effect transistor have exactly three terminals named gate, drain, and source?

Introduction / Context:
Device terminal naming distinguishes FETs from BJTs and helps avoid schematic errors. A JFET’s three accessible terminals—gate (G), drain (D), and source (S)—mirror the structure and control method of the device. Getting the names right is key when reading datasheets or wiring test circuits.

Given Data / Assumptions:

• JFET structure employs a conductive channel between source and drain.
• The gate forms reverse-biased PN junctions to control the channel.
• No separate body terminal is normally used in discrete JFETs.
• Comparison with MOSFET/BJT is for context only.

Concept / Approach:
Unlike BJTs (emitter, base, collector), the JFET uses source, gate, and drain. The gate controls channel width by reverse-biasing, modulating depletion regions. This three-terminal arrangement is standard for discrete parts and symbols used in schematics.

Step-by-Step Solution:

Verification / Alternative check:
Inspect any JFET datasheet pinout (e.g., TO-92 or SOT-23 packages): exactly three pins labeled G, S, and D.

Why Other Options Are Wrong:

Common Pitfalls:
Mixing BJT and FET nomenclature; swapping source/drain in circuits where orientation matters; ignoring package-specific pin numbering.

Final Answer:
Correct