First-Aid Kits for Circuit Boards
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7.5.1 Soldering Surface Mount Gull Wing Components, Point To Point Method
Outline
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.
Minimum Skill Level - Intermediate
Recommended for technicians with skills in basic soldering and component rework, but may be inexperienced in general repair/rework procedures.
Conformance Level - High
This procedure most closely duplicates the physical characteristics of the original, and most probably complies with all the functional, environmental and serviceability factors.
| Acceptability References |
| IPC-A-610 12.0 |
Surface Mount Assemblies |
| Tools and Materials |
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Cleaner
General purpose cleaner for removing contamination. |
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Microscope
It is a challenge to undertake precision repair without a good microscope. |
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Soldering Iron, Solder and Flux
A well maintained soldering iron is a must at every tech bench. |
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Wipes
Nonabrasive, low-linting wipes for cleanup. |
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| Images and Figures |
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| Surface Mount Gull Wing Component |
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| Figure 1: Place component and check alignment. |
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| Figure 2: Place the soldering iron tip at the junction between the pad and component lead. |
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Procedure
- Add liquid flux to the corner pads.
- 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).
- 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).
- Remove the tip. Wait a moment for the solder to solidify before soldering
the opposite corner.
- After the opposite corner is soldered, solder the remaining leads.
- Clean, if required and inspect.
This procedure is for reference only. Refer to the Procedure References listed above, or contact Circuit Technology Center for appropriate industry approved references.
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CircuitMedic
22 Parkridge Road, Haverhill, MA 01835 USA
Phone: 978-373-1600 - Fax: 978-372-5700
Division of Circuit Technology Center, Inc.
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Member Since 1986
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