Double Sided PCBs

Double-Sided PCB Showroom: A Buyer's Guide

This guide focuses on sourcing double-sided PCBs via the showroom (https://www.alibaba.com/showroom/double-sided-pcbs.html). Prioritize due diligence; this is a competitive market with varying quality levels.

1. Specification Clarity is Paramount: Double-sided PCBs offer design flexibility, but require precise specifications. Before contacting suppliers, define:

• Board Dimensions: Exact length, width, and thickness.
• Material: FR-4 is standard, but specify if alternatives (e.g., CEM-1, Rogers) are needed.
• Copper Weight: Expressed in ounces per square foot (oz/ft²). Impacts current carrying capacity. 1oz is common, heavier weights for power applications.
• Track Width/Spacing: Critical for signal integrity and manufacturability. Provide a clear Gerber file.
• Hole Sizes & Types: Through-hole, via, blind/buried vias – specify all.
• Surface Finish: HASL, ENIG, OSP. ENIG offers superior solderability and shelf life, but is more expensive.
• Solder Mask Color: Standard green, or specify alternative.
• Silk Screen: Clarity and legibility are vital.
• Impedance Control: If required, specify target impedance and tolerances.

2. Supplier Verification – Beyond “Gold Supplier”:

Business License: Request and verify* a valid business license. provides verification, but independent confirmation is advisable.

• Factory Audit Reports: Look for suppliers with verified factory audits (e.g., ISO 9001). These indicate quality management systems.
• Transaction History: Review the supplier’s transaction history on – volume and positive feedback are indicators.
• Response Time & Communication: Prompt, clear, and technically competent communication is crucial. Poor communication signals potential issues.
• Minimum Order Quantity (MOQ): Understand the MOQ and its impact on your project. Negotiate if possible.

3. Gerber File Review & DFM (Design for Manufacturability):

Gerber File Check: Always have the supplier review your Gerber files for manufacturability before* placing an order.

• DFM Report: Request a DFM report. This identifies potential issues (e.g., drill sizes, annular rings, solder mask slivers) and allows for design adjustments.
• Panelization: Discuss panelization options with the supplier to optimize manufacturing efficiency and reduce costs.

4. Quality Control & Testing:

• Acceptance Criteria: Clearly define your acceptance criteria (e.g., visual inspection, electrical testing, impedance testing).
• Testing Procedures: Understand the supplier’s testing procedures. Request details on test equipment and methods.
• Inspection Reports: Request detailed inspection reports with photos/videos.

Sample Order: Always* order a sample before committing to a large production run.

5. Logistics & Payment:

• Shipping Options: Understand shipping costs and lead times. Consider using Trade Assurance for payment protection.
• Trade Assurance: Utilize Trade Assurance. It provides refunds if the goods are not shipped on time, or if the quality doesn’t meet agreed-upon standards.
• Incoterms: Clarify Incoterms (e.g., FOB, CIF) to understand responsibilities for shipping, insurance, and duties.