Montaż QFN to proces SMT dla obudów quad flat no-lead, w których połączenia lutowane są częściowo ukryte pod krawędzią elementu.
Gerber, BOM, centroid, stencil notes, X-ray criteria, MOQ, and sample timing are reviewed before quotation.
Capability includes 0.4 mm QFN/LGA, 01005 passives, 100% 3D SPI, AOI, and X-ray review.
IPC-A-610, IPC-A-620, UL-758, and IATF 16949 stay mapped to workmanship and traceability needs.
Na etapie RFQ inżynier zakupów OEM potrzebuje dowodu kontroli pasty, profilu reflow i X-ray, a nie ogólnej deklaracji o linii SMT. Montaż QFN to proces SMT dla obudów quad flat no-lead, w których połączenia lutowane są częściowo ukryte pod krawędzią elementu. Montaż LGA to pokrewny proces dla płaskich padów, wymagający koplanarności i kontrolowanej objętości pasty. Inspekcja X-ray to nieniszcząca kontrola ukrytych połączeń, pokrycia pada termicznego i wzoru pustek. FlexiPCB keeps the technical baseline identical across markets: 0.4 mm QFN/LGA, 01005, 100% 3D SPI, AOI, X-ray, IPC-A-610, IPC-A-620, UL-758, IATF 16949, ISO 9001, 5 business days for samples, and 10-15 business days for typical production after approval.
Polska: for compact controllers, the Singapore robotics case shows why schedule visibility matters. The recorded controls were "multi-PO program", "split PIs", "same-day payment confirmation", and "early delivery warning issued".
The South Africa industrial case moved harness and PCBA sourcing into one program through IC STM32F105RBT6 sourcing, PCB/PCBA manufacturing integration, and Multi-category supply consolidation.
Sensor boards and accessory controllers often combine QFN devices, pigtails, and connector tails; IPC-A-610, IPC-A-620, UL-758, and IATF 16949 are reviewed before release.
Small battery-powered products use QFN packages to save area, but they need controlled paste volume, thermal-pad voiding review, and inspection documentation before enclosure integration.
Zespół zakupów powinien wysłać Gerber, drill, stackup, centroid, assembly drawing, QFN datasheet, quantity forecast, and required inspection records. The review separates real QFN risk from missing-file assumptions.
Otrzymasz uwagi DFM for perimeter pads, exposed thermal pad, aperture reduction, window-pane design, paste-release ratio, and step stencil options before sample build.
QFN/LGA sourcing, date code, approved alternates, moisture sensitivity level, baking notes, and distributor preference are checked so reflow risk does not start at incoming material.
Every paste print is checked by 3D SPI before placement. Reflow is set around flex thickness, stiffener mass, copper balance, and thermal pad load rather than copied from a generic FR-4 profile.
Próbka jest zwalniana z dowodami kontroli. AOI checks visible solder and polarity; X-ray reviews hidden joints and voiding; the report package supports procurement, quality, and engineering sign-off.
Otrzymasz uwagi DFM before samples are started, so solder-mask clearance, exposed-pad size, via-in-pad, orientation, and stencil thickness are not discovered after failure.
QFN solder joints cannot be fully judged visually. 3D SPI and X-ray review make acceptance evidence-based for Polska RFQ teams.
When pigtails or cable exits are included, IPC-A-620 and UL-758 concerns are reviewed together with IPC-A-610 solder workmanship.
The case bank records "multi-PO program", "split PIs", "same-day payment confirmation", and "early delivery warning issued" as real order controls.
A complete package lets engineering price the QFN risk instead of guessing it.
Zespół zakupów powinien wysłać Gerber, drill, stackup, assembly drawing, centroid, and panel constraints.
Zespół zakupów powinien wysłać BOM with QFN/LGA datasheets, approved alternates, MSL class, and sourcing preference.
Zespół zakupów powinien wysłać stencil file if available, or paste-layer notes for aperture reduction and thermal pad targets.
Zespół zakupów powinien wysłać X-ray acceptance criteria, voiding expectation, test requirement, and sample approval process.
Zespół zakupów powinien wysłać MOQ, annual forecast, target sample date, production release date, and shipment split plan.
The response is built for procurement, quality, and engineering review.
Otrzymasz uwagi DFM on QFN footprint, exposed pad, via-in-pad, stencil thickness, and paste-window design.
Quotation with MOQ, sample lead time, production lead time, tooling, and component sourcing risks for Polska.
Inspection plan covering 3D SPI, AOI, X-ray review, electrical test, and report format.
Standards map for IPC-A-610, IPC-A-620, UL-758, IATF 16949, and ISO 9001 documentation needs.
Production release checklist for BOM revision, lot traceability, packaging, and split-delivery control.
Montaż QFN to proces SMT dla obudów quad flat no-lead, w których połączenia lutowane są częściowo ukryte pod krawędzią elementu. Paste control, reflow profile, and X-ray review matter more than visual inspection alone.
Yes. We support QFN and LGA packages on flex and rigid-flex boards when footprint, stiffener support, bend-zone distance, and reflow profile pass DFM review.
Send Gerber, BOM, centroid, assembly drawing, QFN datasheets, stencil or paste notes, quantity forecast, sample target, and X-ray or voiding acceptance criteria.
Public references provide standards context; customer drawings and purchase specifications control production acceptance.
IPC-A-610 and IPC-A-620 are used as workmanship references for solder joints, cable interfaces, and accept/reject discussions. The URL is kept identical across locales for standards consistency.
UL-758 wire style context matters when the QFN board ships with pigtails, internal wiring, or harness integration. The URL is kept identical across locales for standards consistency.
Automotive and industrial OEMs often use IATF 16949 discipline for traceability, change control, and production release. The URL is kept identical across locales for standards consistency.
Written for global OEM procurement teams evaluating QFN assembly suppliers at RFQ stage.
FlexiPCB manufacturing and sourcing specialist
Hommer Zhao has supported flexible PCB, PCBA, and cable-integrated builds for OEM procurement teams since 2008. For QFN assembly programs, the engineering review focuses on hidden-joint inspection, paste-window control, component sourcing, sample timing, and production release documentation.
Factory KPI
5 business day typical samples after complete RFQ and material approval
Production KPI
10-15 business day typical production lead time after sample approval
Case evidence
multi-PO program; split PIs; same-day payment confirmation; early delivery warning issued
Standards
IPC-A-610, IPC-A-620, UL-758, IATF 16949, ISO 9001
Paste inspection, fine-pitch placement, reflow profiling, and hidden-joint review for compact PCBAs
