RIT CEMA - Surface Mount Technology

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SMT Process Fundamentals for Tin-Lead and
Lead Free Assembly

1-Day Tutorial

Course Description

This course will provide an introductory understanding of the surface mount and mixed technology assembly processes for lead based and lead free electronics packaging. Topics include coverage of PCBs, assembly types, component types, assembly process, assembly materials, identification of defects, and process control. Critical design tips for ease of manufacture and assembly will be introduced throughout the lecture. Tradeoff decisions between different materials and equipment types will also be highlighted. Basic laboratory demonstrations are included.

Who should attend?

People with very little or no background in SMT
Process, Design, Test and Quality Engineers
Process and Quality Technicians
Operators
Marketing, Sales and Purchasing Staff
Managers

After completing this course, you should be able to:

Identify various SMT components, their terminology and nomenclature
Understand what a PCB is and also the need for effective thermal management
Identify types of mixed technology PCB assemblies and their assembly sequence
Understand the influence of design on the ease of manufacturing and assembly
Understand thoroughly the entire assembly process and the various parameters that influence it.
Understand the influence of various materials such as solder paste, adhesives, flux, etc.
Detect assembly process defects and troubleshoot them.
Evaluate equipment required for setting up assembly lines
Understand Lead Free Implementation and Issues.

Topical Outline

Electronics Packaging & Levels
- Functions of Packaging
- Thermal management issues
- PCB Packaging
- Assembly Types
- Assembly Process Sequence
PCB Types, Materials and Manufacturing
Overview of Through Hole Technology

Component Types & Process Steps

Overview of Surface Mount Technology
- Passive Component Types
- Active Component Specifications
- Active Component Types (ICs)
- Common SMT assembly process
Stencil Printing
- Solder Paste-Characterization, Types, Handling & Safety
- No-Lead Solder and its Impact
- Stencils and Squeegees-Materials, Types & Manufacturing
- Print Parameters
- Process requirements for Lead Free
- Print Characteristics, Defects and Corrective Action
Adhesive Dispense
- Adhesive Types, Selection & Dispensing Techniques
- Inspection
- Reflow Curing
Component Placement
- Factors Influencing the use of Automated Placement Equipment
- Machine Configurations & Types
- Component Packaging for Automated placement
Soldering
- Reflow Soldering
  - Typical Reflow Profile
  - Profiling & its importance-How to?
  - Factors affecting good reflow
  - Lead Free Solder and Profiling Changes
- Wave Soldering
  - Changes needed for Lead Free Solder
  - Process Sequence & Defects
Cleaning Materials, Process, & Testing for cleanliness
Inspection Techniques, Assembly Defect Identification and Corrective Action
Testing of PCB Assemblies
Rework and Repair