7.4.3 Soldering Surface Mount J Lead Components, Hot Gas Method

Procedure covers soldering of surface mount J lead components on circuit board assemblies using a hot gas method.
Outline
This procedure covers the general guidelines for soldering surface mount J lead components. There is basically only one style of J lead 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
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 And Component Removal
7.1.3 Solder Joint Acceptability Criteria
IPC7711 5.6.3 Solder Paste Method/Hot Air Pencil
Kits and Systems

Additional Items and Supplies

Images and Figures
7.4.3 Soldering Surface Mount J Lead Components, Hot Gas Method
Surface Mount J Lead Component
7.4.3 Soldering Surface Mount J Lead Components, Hot Gas Method
Figure 1: Add a small bead of solder paste along the row of pads.
7.4.3 Soldering Surface Mount J Lead Components, Hot Gas Method
Figure 2: Move the tool back and forth to heat all the solder joints until complete solder melt is observed.

7.4.3 Soldering Surface Mount J Lead Components, Hot Gas Method
Figure:3A - Dot indicates pin 1;B - Indicates pin 5;C - Indicates direction of pin count.
Procedure
Procedure
  1. Add a small bead of solder paste along the row of pads. (See Figure 1)
  2. Place the component in position.
  3. Adjust the pressure and temperature output of the hot air tool.
  4. Direct the hot air over the component with the hot air tool tip approximately 2.50 cm (1.00") from the solder joint. This initial heating will pre-dry the solder paste.
    Note: Solder paste has a dull, flat appearance when dried.
  5. When the solder paste has dried, move the hot air tooltip to approximately 0.50 cm (0.20") above the component. Move the tool back and forth to heat all the solder joints until complete solder melt is observed. (See Figure 2)
  6. Remove the tool. Wait a moment for the solder to solidify.
  7. Clean, if required, and inspect.
Solder Joint Acceptable Criteria - J Lead Components
Solder Joint Acceptance Criteria
Feature Dim Class 1 Class 2 Class 3
Maximum Lead Side Overhang 1 No more than 50% of the lead width. No more than 50% of the lead width. No more than 25% of the lead width.
Maximum Lead Toe Overhang 2 Not specified. Not specified. Not specified.
Minimum Lead End Joint Width 3 50% of the lead width. 50% of the lead width. 75% of the lead width.
Minimum Side Joint Length 4 Evidence of proper wetting. Side joint length must exceed 150% of the lead width. Side joint length must exceed 150% of the lead width.
Maximum Fillet Height 5 No maximum, but solder must not touch the component package body. No maximum, but solder must not touch the component package body. No maximum, but solder must not touch the component package body.
Mininimum Heel Fillet Height 6 Equal to the solder thickness plus 50% of the lead thickness. Equal to the solder thickness plus the lead thickness. Equal to the solder thickness plus the lead thickness.
Mininimum Solder Thickness 7 Evidence of proper wetting. Evidence of proper wetting. Evidence of proper wetting.
CONTACT US



Send Documents *
No file chosen
No file chosen

Notes/Questions/Requests

Security Check



* You may upload PDFs and other file types (max 4 MB each). For multiple files, zip them or send to info@circuitrework.com

Form Security
Our forms run on AWS with an industry-leading firewall. Data is encrypted at rest with AES-256 and in transit using TLS 1.2+.
We're Here To Help.   
CONTACT US