SMD IC Package and Soldering

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Questions and Answers

What is the coating type that is mentioned alongside shellac?

PVC coating

Which zone comes after the preheat zone in the reflow soldering process?

Reflow zone

What is the last zone in the reflow soldering process?

Cooling zone

Which coating is mentioned alongside enamel varnish?

Shellac Signup and view all the answers

What is the first stage in the reflow soldering process?

Preheat zone Signup and view all the answers

What is the purpose of using a Bench top Ioniser?

To control ESD in the work environment Signup and view all the answers

What comes after the reflow zone in the reflow soldering process?

Cooling zone Signup and view all the answers

Which coating is mentioned alongside polymer film coating?

Enamel varnish Signup and view all the answers

What does PGA stand for in SMD IC package?

Package Grid Array Signup and view all the answers

What is the term for melting a little solder on the tip of the iron?

Tinning Signup and view all the answers

How many stages are there in the reflow soldering process?

4 Signup and view all the answers

What is the name of the defect caused due to an ESD event?

ESD damage Signup and view all the answers

What is the purpose of controlling ESD in the work environment?

To prevent electrostatic discharge Signup and view all the answers

What type of hot air pencil tip is used in SMD soldering?

Angled type Signup and view all the answers

What is the benefit of using a Bench top Ioniser in the work environment?

It controls moisture and ESD in the work environment Signup and view all the answers

What is the range of temperature setting on soldering work station for soldering SMD ICs?

250°C to 280°C Signup and view all the answers

How does the desoldering braid remove the molten solder from the joint on the PCB?

By capillary action Signup and view all the answers

What is the term for changing the tip of the iron in soldering?

Changing the tip of the iron Signup and view all the answers

What is the result of an ESD event?

Damage to electronic components Signup and view all the answers

What is the main purpose of using a hot air pencil in SMD soldering?

To heat the joint Signup and view all the answers

What is the primary function of a desoldering braid?

To remove excess solder Signup and view all the answers

What is the purpose of ESD control in the work environment?

To prevent electrostatic discharge Signup and view all the answers

What is the advantage of using SMD ICs?

They occupy less space Signup and view all the answers

What is the primary concern when handling SMD ICs?

They are sensitive to static electricity Signup and view all the answers

Which relay is used for the time delay purpose?

Impulse relay Signup and view all the answers

Which relay operates with very low power?

Reed relay Signup and view all the answers

What is the current rating of a cartridge fuse with a brown colour code?

2A Signup and view all the answers

What is the primary function of an impulse relay?

To provide time delay Signup and view all the answers

What type of relay is sensitive to temperature changes?

Thermal relay Signup and view all the answers

Which type of relay is commonly used in electronic circuits?

Reed relay Signup and view all the answers

What is the primary characteristic of a reed relay?

Low power operation Signup and view all the answers

What is the main application of thermal relays?

Overheat protection Signup and view all the answers

What happens to components when the ramp-up rate exceeds the maximum slope in the heat zone of reflow soldering?

They get burnt Signup and view all the answers

What is the primary consequence of a ramp-up rate that surpasses the maximum slope in the heat zone of reflow?

Burnt or cracked components Signup and view all the answers

What happens to the components when the ramp-up rate is within the maximum slope in the heat zone of reflow?

No change occurs Signup and view all the answers

What is the purpose of controlling the ramp-up rate in the heat zone of reflow soldering?

To reduce the risk of component damage Signup and view all the answers

What is the consequence of exceeding the maximum slope in the heat zone of reflow soldering on component reliability?

It reduces component reliability Signup and view all the answers

What is the effect of a rapid ramp-up rate on components in the heat zone of reflow?

They are more likely to get burnt or cracked Signup and view all the answers

What is the outcome of a slow ramp-up rate in the heat zone of reflow soldering?

Components are less likely to get burnt or cracked Signup and view all the answers

What is the significance of controlling the ramp-up rate in the heat zone of reflow soldering?

It reduces the risk of component damage Signup and view all the answers

Study Notes

SMD IC Package

Package Grid Array (PGA) is the full form of the abbreviation PGA used in SMD IC package.

SMD Soldering

Oval type hot air pencil tip is used in SMD soldering.
The range of temperature setting on soldering work station for soldering SMD ICs is 250°C to 280°C.
Desoldering braid removes the molten solder from the joint on the PCB by capillary action.

Bench Top Ionisers

The use of Bench top Ionisers is to control ESD in the work environment.

Soldering Terms

Tinning in soldering refers to melting a little solder on the tip of the iron.
ESD event can cause a defect, which is known as a shellac defect.

Reflow Soldering

The last zone on the reflow soldering process is the Cooling zone.
The second stage in the reflow soldering process is the Reflow zone.

Component Effects

Exceeding the maximum ramp-up rate in the reflow soldering process can cause components to burn.

Relays

Reed relay is used for time delay purposes and operates with very low power.
Impulse relay, Thermal relay, and Electromagnetic relay are other types of relays.

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