Printed Board Type: R/F/C
Skill Level: Intermediate
Conformance Level: High
Revision: D
Revision Date: Jul 7, 2000

OUTLINE

Surface Mount Gull Wing Component

This procedure covers the general guidelines for soldering surface mount Gull Wing components. There is basically only one type of Gull Wing component. Whether leads are on two sides or four sides, or whether the component is large or small, the soldering principles are the same.

ACCEPTABILITY REFERENCES
IPC-A-610 12.0	Surface Mount Assemblies
PROCEDURE REFERENCES
1.0	Foreword
2.1	Handling Electronic Assemblies
2.2	Cleaning
2.5	Baking and Preheating
7.1.1	Soldering Basics
7.1.2	Preparation For Soldering
7.1.3	Solder Joint Acceptability Criteria
IPC7711 5.5.3	Point-To-Point Method

Figure 1: Place component and check alignment.

TOOLS & MATERIALS
Cleaner
Flux
Microscope
Solder
Soldering Iron with Tips
Wipes

PROCEDURE    Preview a Video Clip   (Size - 500KB)

1. Add liquid flux to the corner pads.
   
   
2. Place the component in position and hold it steady. The leads must be aligned with the pads. On large components this is best done by aligning the leads on opposite corners. (See Figure 1).
   
   

3. Figure 2: Place the soldering iron tip at the junction between the pad and component lead.

   Place the soldering iron tip at the junction between the pad and component lead at one of the corners. The soldering iron tip may rest at the junction of the component lead and pad or on top of the lead. Apply additional wire solder as needed. (See Figure 2).
   
   
4. Remove the tip. Wait a moment for the solder to solidify before soldering the opposite corner.
   
   
5. After the opposite corner is soldered, solder the remaining leads.
   
   
6. Clean, if required and inspect.