Thyristor family naming – Match device acronyms to their full names List I (Acronym) A. SUS B. SBS C. SCS D. Shockley diode List II (Device) Silicon unilateral switch Silicon bilateral switch Silicon controlled switch Four-layer diode (p–n–p–n Shockley diode) Select the correct mapping.
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AA-1, B-2, C-3, D-4
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BA-1, B-3, C-4, D-2
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CA-4, B-2, C-3, D-1
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DA-1, B-2, C-4, D-3
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EA-2, B-1, C-3, D-4
Answer
Correct Answer: A-1, B-2, C-3, D-4
Explanation
Introduction / Context:Members of the thyristor family include several two- and three-terminal switches. Correctly expanding acronyms avoids confusion during selection and fault analysis.
Given Data / Assumptions:
- SUS = silicon unilateral switch (two-layer-like behavior with triggering).
- SBS = silicon bilateral switch (conducts in both polarities when triggered).
- SCS = silicon controlled switch (gate-controlled four-layer device).
- Shockley diode = four-layer p–n–p–n diode (two-terminal) with negative-resistance region.
Concept / Approach:
Map acronyms to the canonical names used in textbooks and datasheets.
Step-by-Step Solution:
A (SUS) → 1.B (SBS) → 2.C (SCS) → 3.D (Shockley diode) → 4.Verification / Alternative check:
Manufacturer datasheets and power electronics texts confirm these expansions.
Why Other Options Are Wrong:
Swapping bilateral/unilateral reverses operating quadrants; mislabeling the Shockley diode ignores its classic four-layer structure.
Common Pitfalls:
Confusing SCS with SCR; the SCR is the silicon controlled rectifier, not “switch.”
Final Answer:
A-1, B-2, C-3, D-4.