1. Compliance with IPC4101ClassB/L for CCL Tolerance Requirements

– Benefit: Precise control of dielectric layer thickness reduces electrical performance deviation, leading to consistent output/performance.

– Risk: Inadequate electrical performance and significant variation in component output within the same batch.

2. Adherence to IPC-SM-840ClassT for Solder Mask Material Definition

– Benefit: Ensuring “excellent” ink safety and compliance with UL standards, preventing adhesion and hardness issues.

– Risk: Poor-quality inks causing adhesion, flux resistance, and hardness problems, leading to solder mask detachment and potential copper circuit corrosion.

3. Strict Tolerances for Shapes, Holes, and Mechanical Features

– Benefit: Tight control of tolerances improves product dimensional quality, enhancing fit, form, and function.

– Risk: Alignment and mating problems during assembly, as well as mounting difficulties due to increased dimensional deviations.

4. Required Thickness of Solder Mask

– Benefit: Improved insulation properties and resistance to mechanical shock, reducing the risk of detachment and copper circuit corrosion.

– Risk: Thinner solder mask leading to adhesion, flux resistance, and hardness problems, potentially causing short circuits and accidental electrical continuity/arcing.

5. Appearance and Repair Requirements Definition

– Benefit: Ensuring a safe and carefully manufactured product.

– Risk: Potential surface damage impacting assembly and hidden issues impacting actual use.

6. Plug Hole Depth Requirements

– Benefit: High-quality plug holes reduce assembly failure risk.

– Risk: Residual chemical deposits and tin beads in incomplete plug holes causing solderability issues and short circuits.

7. Specification of Peelable Blue Glue Brand and Model

– Benefit: Avoiding the use of inferior or cheap brands of peelable blue glue.

– Risk: Poor quality or cheap peelables causing assembly issues and rendering the peelables ineffective.

8. Specific Approval and Ordering Procedures for Each Purchase Order

– Benefit: Ensuring confirmation of all specifications in the purchase order process.

– Risk: Uncovered specification deviations discovered only during assembly or final product stages, leading to setbacks.

9. Rejection of Scrapped Units

– Benefit: Enhancing efficiency by avoiding the use of partial assemblies.

– Risk: Special assembly procedures for defective kits, potential assembly of known bad boards, and waste of parts and time if scrapped units are not clearly marked or isolated.

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