IPC-4553: Immersion Silver Drawing & Lot Record Guide

Identify the exact standard revision and any customer requirement in the purchase documents. Resolve conflicts with the fabrication drawing before release. The linked 2009 Chinese preview provides historical scope context; use the complete controlled document required by the order.

Check the standards publisher for document status when preparing a new specification. Do not assume a web article is the latest revision or that the word compliant supplies the full acceptance plan. Purchasing and receiving inspection need the same documented basis.

Record the board or coupon, lot, location, method and units for each result. A thin silver deposit needs an appropriate measurement setup and calibration. Preserve the original readings along with the reported summary and any uncertainty relevant to the decision.

The three-reading workbench converts units and displays mean and range for one measurement basis. It does not define sampling, validate calibration or decide compliance. Do not merge results from unrelated lots or different measurement setups merely to produce a favorable average.

Define the required appearance criteria and how a suspect lot will be evaluated. Tarnish color is not a universal test for solderability, and a bright surface does not establish resistance to every corrosive environment. Keep the inspection question precise.

Solderability evidence concerns the intended PCB assembly use. Environmental testing concerns a specified exposure and product configuration. Agree the applicable methods and acceptance basis separately, including whether test specimens represent the supplied bare boards or the assembled product.

Request the finish record and packaging history required by the order. Identify discrepancies before the boards are mixed into inventory. Hold ambiguous results for clarification rather than silently substituting a different standard, unit or storage assumption.

Send PCBSync the drawing and expected shipment documentation with the inquiry. Retain any agreed exception with the affected quantity and revision. A clear receiving package helps engineering and procurement distinguish an administrative gap from a physical finish issue requiring investigation.