CIS CIS ESD Control & Protection 1 — Questions and Answers
Question 1: What does 'ESD' stand for in electronics manufacturing?
- Electrical Signal Disruption
- Electrostatic Discharge (Correct answer)
- Electronic System Degradation
- Electromechanical Static Dampening
Correct answer: Electrostatic Discharge
ESD stands for Electrostatic Discharge, which is the sudden flow of electricity between two objects with different electrostatic charges.
Question 2: Which IPC/ESD standard governs ESD control programs for electronics manufacturing?
- IPC-A-610
- ANSI/ESD S20.20 (Correct answer)
- IPC-7711
- MIL-STD-1686
Correct answer: ANSI/ESD S20.20
ANSI/ESD S20.20 is the primary standard for developing ESD control programs for electronics manufacturing environments.
Question 3: What is an EPA (ESD Protected Area)?
- An area with enhanced power filtering to prevent EMI
- A designated zone where ESD-sensitive devices are handled with ESD control measures in place (Correct answer)
- A room with humidity above 60% to prevent static buildup
- A storage area for non-ESD-sensitive components only
Correct answer: A designated zone where ESD-sensitive devices are handled with ESD control measures in place
An EPA is a defined area where ESD-sensitive devices are handled and all personnel, equipment, and materials meet ESD control requirements.
Question 4: What is the typical surface resistance range for ESD dissipative materials?
- Less than 1 × 10³ ohms/square
- 1 × 10⁴ to 1 × 10¹¹ ohms/square (Correct answer)
- Greater than 1 × 10¹² ohms/square
- 1 × 10² to 1 × 10³ ohms/square
Correct answer: 1 × 10⁴ to 1 × 10¹¹ ohms/square
ESD dissipative materials have a surface resistance of 1 × 10⁴ to 1 × 10¹¹ ohms/square, allowing slow, controlled discharge of static charges.
Question 5: Which ESD failure mode occurs when a device appears to function but has hidden latent damage from a prior ESD event?
- Catastrophic failure
- Latent defect (Correct answer)
- Parametric failure
- Hard failure
Correct answer: Latent defect
A latent defect is hidden damage from an ESD event that does not immediately cause failure but may cause the device to fail prematurely in the field.
Question 6: A wrist strap used for ESD protection should be tested:
- Once per week at minimum
- Only when a new strap is first issued
- Before each use or at the beginning of each shift (Correct answer)
- Monthly, with documentation kept for one year
Correct answer: Before each use or at the beginning of each shift
ESD wrist straps should be tested before each use or at the beginning of each shift to verify continuity and proper grounding function.
CIS CIS ESD Control & Protection 1
What does 'ESD' stand for in electronics manufacturing?