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What Is SMT First Pass Yield? Practical Ways to Improve It
First Pass Yield (FPY) is a key indicator to evaluate the overall performance, process capability and quality management of SMT production. It refers to the percentage of products that pass all production processes and inspections without rework. It directly determines production cost, delivery efficiency and customer satisfaction.
Low FPY will lead to more defective goods and heavy rework work, resulting in longer lead time and higher material & labor loss.

Main Factors Affecting FPY

  1. Material quality: Oxidation, deformation and poor solderability of PCB and components.

  2. Printing process: Excessive, insufficient or offset solder paste causes short circuits and dry joints.

  3. Mounting accuracy: Defects such as tombstoning, billboarding and component flipping.

  4. Reflow soldering: Improper temperature profile leads to cold joints, dull joints and cracks.

  5. On-site management: Lack of regular equipment maintenance and standardized operation.

Effective Solutions to Improve FPY

  1. Carry out strict incoming inspection for PCB, components, solder paste and flux. Reject unqualified materials.

  2. Fix printing parameters, inspect and maintain stencils and squeegees regularly.

  3. Calibrate nozzles, vision system and mounting coordinates to reduce placement defects.

  4. Customize reflow profile for different PCBs and components, and record temperature test data for each batch.

  5. Implement first article inspection and in-line patrol to prevent batch defects.

  6. Provide regular training for operators and standardize equipment maintenance rules.

Improving FPY requires systematic management covering materials, machines, processes and staff. Continuous optimization helps achieve high-quality and high-efficiency mass production.
Globalwell takes FPY as an important management target. We adopt standardized inspection and parameter control, and keep optimizing production processes to ensure efficient order delivery with high yield.


 

Article keywords ：PCB, PCB assembly, Printed circuit board，prototype pcb, pcb manufacturer, PCB factory, PCB board, PCB prototypes,pcb price, pcb fabricate, turn-key PCB

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