Company: DSWL
Filing Date: 2025-07-29
Form Type: 20-F
Source: 0001174947-25-001096
Chunk: 56

Company: DESWELL INDUSTRIES INC
Filing Date: 2025-07-29
Form: 20-F
Item: Item 4
Chunk 56
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.4% respectively, of the Company’s total sales.

In assembling printed circuit boards the Company purchases printed circuit boards, surface mounted components and chips and uses automatic insertion and pin-through-holeinterconnection technologies to assemble various components onto the PCBs. Before delivery, completed PCBs are checked by in-circuittesters and outgoing quality assurance inspections are performed.

Table of Contents

PTH is a method of assembling printed circuit boards in which component leads are inserted and soldered into plated holes in the board. While this technology is several decades old and is labor intensive, it still has a significant market, particularly for consumer product applications.

BGA is a method of mounting an integrated circuit or other component to a PCB. Rather than using pins that consume a large area of the PCB, the component is attached to the circuit board with small balls of solder at each contact. This method allows for greater component density and is used in more complex PCBs.

SMT is the automatic process of printed circuit board assembly in which components are mounted directly to the surface of the board, rather than being inserted into holes. With this process, solder is accurately stenciled in paste form on pads located on the printed circuit board and the components are then placed onto the solder paste and fused to the melting point of the paste to establish a strong solder joint between components and the printed circuit board. The SMT process allows miniaturization of PCBs, cost savings and shorter lead paths between components (which results in faster signal speed and improved reliability). Additionally, it allows components to be placed on both sides of the printed circuit board, a major factor for the purpose of miniaturization.

Manufacturing operations include PCB assembly, wiring and testing. The process is completed by assembling the PCBs into a plastic or metal housing that comprises the finished product. Quality assurance is then conducted in accordance with the customers’ requirements before the shipment.

Quality Control

The Company maintains strict quality control procedures for its products. At hourly intervals, the Company’s quality control personnel monitor machines and molds to assure that plastic parts are free from defects.

For electronic operations, the Company’s quality control personnel check all incoming components. Moreover, during the production stage, the Company’s quality control personnel check all work in process at several points in the production process. Finally, after the final assembly and before shipment, the Company conducts quality assurance inspections in accordance with the customers’ Acceptable Quality Level, or AQL, requirements.

In 1995, the Company earned ISO 9001 certifications for both its plastic and electronic