CIT Acceptability of Electronic Assemblies 5

Question 1

In IPC-A-610, what is the primary distinction between Class 1 and Class 2 product categories?

Accepted Answer

Class 1 is for consumer products with basic reliability; Class 2 is for dedicated service electronics

Answer

Class 1 covers general electronics with basic reliability requirements, while Class 2 covers dedicated service products requiring longer life.

Question 2

A solder bridge connecting two adjacent lands on a Class 2 PCB is classified as:

Accepted Answer

A defect

Answer

Solder bridges that create unintended electrical connections between conductors are defects for all classes.

Question 3

Per IPC-A-610, which type of component tombstoning is considered a defect?

Accepted Answer

One end of the component lifted off its land

Answer

Tombstoning — where one end of a chip component lifts completely off its land — is a defect for all classes.

Question 4

Which IPC-A-610 criterion applies when evaluating the acceptability of a solder joint on a connector with press-fit contacts?

Accepted Answer

Press-fit connections require no solder; visual mechanical seating criteria apply

Answer

Press-fit contacts are designed to make gas-tight connections without solder; IPC-A-610 evaluates mechanical seating.

Question 5

According to IPC-A-610, exposed copper on a conductor (nick or scrape) that does not reduce the conductor width below minimum is classified as:

Accepted Answer

Acceptable if treated with compatible coating

Answer

Exposed copper nicks are acceptable when the conductor width is maintained and the exposed area is coated with compatible material.

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