Legal Boundary
Purchased circuit board production requires a precise contract manufacturing agreement to establish the legal limits between original equipment makers and surface mount technology assembly suppliers. This written instrument governs liability limits, intellectual property protection, and warranty obligations across every production run. Without this commercial framework, buyers lack recourse when assembled printed circuit boards fail electrical test verification or suffer from solder bridging defects.
The document defines exact responsibilities for component procurement, scrap rates, and tooling ownership before any stencil goes on the printer.
Component Ownership
Supplied materials and consigned inventory remain under the formal custody of the buyer while housed inside the factory. The assembly supplier maintains strict material control records to track reel counts, moisture sensitive device exposure times, and lot codes for every active part number. When component shortages halt production lines, the liability for idle machine time depends entirely on which party missed the procurement window defined in the document.
Excess inventory reconciliation occurs at the conclusion of the life cycle, requiring the contract manufacturer to return unused integrated circuits and passives within a specified timeframe.
Defect Liability
Assembled printed circuit boards undergo automated optical inspection and flying probe testing to catch solder defects and missing components before final packaging. The contract manufacturing agreement allocates financial responsibility for rework costs, scrap boards, and field failures discovered during functional testing. When boards fail X-ray inspection due to voiding underneath ball grid array packages, the supplier bears the cost of corrective action only if the process parameters deviated from the approved reflow profile.
Operational disputes regarding workmanship standards are settled by referencing IPC-A-610 class requirements cited directly within the text of the agreement.
