SCR terminals — correct naming versus BJT: “A silicon-controlled rectifier (SCR) has 3 terminals labeled base, collector, and emitter.” Decide if these terminal names are correct for an SCR.

Introduction / Context:
Different semiconductor devices use different terminal names. Confusing an SCR with a bipolar junction transistor (BJT) can cause wiring errors and device damage. This question ensures you know the proper SCR terminal nomenclature.

Given Data / Assumptions:

• Device: SCR (a thyristor).
• Standard SCR terminals: anode (A), cathode (K), gate (G).
• BJT terminals: base (B), collector (C), emitter (E).

Concept / Approach:
SCRs are four-layer PNPN devices, not transistors. Their control electrode is the gate, and the main current path is between anode and cathode. Referring to SCR terminals as base, collector, and emitter is incorrect; those names apply to BJTs. Correct naming is critical because pinouts and driver circuits differ completely between SCRs and BJTs.

Step-by-Step Solution:

Verification / Alternative check:
Manufacturers’ datasheets for SCRs label pins as A, K, and G. Application circuits show gate triggering between gate and cathode, not “base–emitter.”

Why Other Options Are Wrong:

• Correct / valid only for certain SCRs / depends on package: No SCR uses BJT terminal naming; package does not alter terminology.
• True when used as a switch: Function does not change terminal names.

Common Pitfalls:
Assuming all three-terminal power devices share transistor naming; miswiring gate/cathode as if they were base/emitter.

Final Answer:
Incorrect