Evaluate equipment as part of a controlled process route
An equipment list becomes useful when each item is connected to the product, operation and evidence it supports. The proposed SMT, assembly and through-hole route should be reviewed against the actual facility and equipment records. General equipment descriptions do not establish reserved capacity, placement accuracy, inspection coverage or a schedule for an individual order.
| Process | Questions for route review | Supporting record |
|---|---|---|
| Paste deposition | Which stencil, support, paste and critical apertures are used? | Approved stencil and setup information; inspection plan where specified |
| Placement | Are package presentation, panel support and orientation data suitable? | BOM and placement revision, package exceptions and setup approval |
| Soldering | Which alloy, thermal restrictions and board conditions apply? | Approved process window and relevant profile record |
| Inspection | Which joints and features are actually observable? | Inspection scope, acceptance criteria and findings |
| Through-hole and assembly | How are thermal load, mechanical fit and operator steps controlled? | Assembly instructions, fixtures and required checks |
| Programming and functional test | Who supplies software, fixtures, limits and reference units? | Version-controlled procedure and agreed result records |
Nominal specifications and project conclusions
A machine specification describes a stated condition. Your board introduces package mix, warpage, thermal mass, access, handling and inspection constraints. Equipment selection therefore follows a review of those inputs. The quotation should identify any project-specific exceptions and the evidence required before release.
Share panel dimensions, critical packages, material and thermal restrictions, inspection requirements and quantities. For hidden joints, specify the intended inspection and functional coverage instead of assuming one machine will prove the complete product.
Prepare the route discussion
Use SMT inputs and the test responsibility matrix to describe the work. The capability review connects geometry and process combinations. Submit the available data through the engineering RFQ.
Equipment parameters that belong in a process review
The following are parameter categories to request, not a KFPCBA equipment inventory or approved operating window. Printing depends on aperture geometry, stencil thickness, paste condition and board support. Placement depends on the actual package presentation, nozzle, vision program and panel reference. Reflow depends on the selected alloy, component restrictions and a measured loaded-board profile. Inspection depends on accessible features, imaging conditions and the agreed defect definition.
| Operation | Record these inputs | Do not infer from a machine brochure |
|---|---|---|
| Stencil printing | Aperture and foil revision, support map, paste identity and print results | Acceptable deposit on every pad or a universal minimum aperture |
| Placement | Package ordering code, feeder orientation, centroid convention and first-article overlay | Installed-board accuracy, supported package mix or reserved throughput |
| Reflow | Thermocouple positions, board loading, measured profile and selected material limits | A process profile from an oven zone setting alone |
| Inspection and test | Method, observable region, fixture and software revision, criteria and blind spots | Complete hidden-joint integrity or product qualification |
A geometric example, not a printing acceptance limit
For an assumed rectangular aperture 0.25 mm wide and 0.60 mm long through a 0.10 mm foil, opening area is 0.15 mm² and sidewall area is 2 × 0.10 × (0.25 + 0.60) = 0.17 mm². Their ratio is approximately 0.88. This editorial geometry exercise does not establish paste transfer or suitability. Confirm the actual shape, wall finish, paste, stencil and trial results; no pass threshold is assigned here.
Source: Texas Instruments, QFN and SON PCB Attachment, SLUA271C, manufacturing and stencil discussion; checked 2026-11-11. Supports package-dependent assembly planning only, not the fictional aperture, a universal acceptance limit, or KFPCBA machinery.
Prepare the SMT process inputs and proposed inspection/test record for a route review.
