How to Process Through-Hole Components by Reflow Assembly

This podcast by Würth Elektronik explains conditions and processes how to mount through-hole components by reflow.

Because of fast assembling and small sizes, designers are turning to surfance mount technology on their PCBs.

Although there are still through-hole (THT) components that need to be soldered by Wave, Through-Hole Reflow (THR), allows designers to solder the Through-Hole Components together with the surfance mount parts in the Reflow Oven, thus canceling the whole Wave Soldering Process; saving time and money.

Enhancing PCB Design with Through-Hole Reflow (THR) Technology

This presentation explores the integration of Through-Hole Reflow (THR) technology in Printed Circuit Board (PCB) design and manufacturing. It highlights the evolution of PCB assembly from traditional through-hole components to modern Surface Mount Technology (SMT), while emphasizing the benefits, process optimizations, and quality considerations associated with THR.

1. Introduction

The evolution of PCB technology has transitioned from large, bulky through-hole components to compact SMT. However, certain components such as connectors necessitate robust mechanical stability, achievable through THR. This paper delves into the rationale, requirements, and processes involved in THR.

2. The Necessity of Through-Hole Components

Despite the prevalence of SMT, through-hole components are essential for:

3. Material and Design Requirements

3.1 Housing Material

3.2 Structural Modifications

4. PCB Layout and Stencil Design

4.1 Via and Pad Design

4.2 Stencil Aperture Design

5. THR Process Stages

5.1 Solder Paste Application

5.2 Component Placement

5.3 Reflow Soldering

6. Quality Assurance: IPC-A-610 Standards

6.1 Solder Joint Criteria

7. Advantages of THR Technology

8. Summary

THR technology bridges the gap between traditional through-hole robustness and SMT efficiency. By adapting component materials, PCB layout, and reflow processes, manufacturers can achieve superior mechanical and electrical performance while optimizing production costs.

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