Lắp ráp QFN là quy trình SMT cho package quad flat no-lead, nơi mối hàn nằm ẩn dưới mép linh kiện.
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.
Ở giai đoạn RFQ, kỹ sư mua hàng OEM cần thấy cách kiểm soát kem hàn, profile reflow và X-ray, không chỉ nghe rằng dây chuyền SMT làm được. Lắp ráp QFN là quy trình SMT cho package quad flat no-lead, nơi mối hàn nằm ẩn dưới mép linh kiện. Lắp ráp LGA là quy trình liên quan với pad phẳng, đòi hỏi coplanarity và thể tích kem hàn được kiểm soát. Kiểm tra X-ray là phương pháp không phá hủy để xem mối hàn ẩn, độ phủ thermal pad và dạng voiding trước khi xuất lô. 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.
Việt Nam: 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.
Đội mua hàng nên gửi Gerber, drill, stackup, centroid, assembly drawing, QFN datasheet, quantity forecast, and required inspection records. The review separates real QFN risk from missing-file assumptions.
Bạn sẽ nhận phản hồi 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.
Mẫu được phát hành cùng bằng chứng kiểm tra. AOI checks visible solder and polarity; X-ray reviews hidden joints and voiding; the report package supports procurement, quality, and engineering sign-off.
Bạn sẽ nhận phản hồi 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 Việt Nam 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.
Đội mua hàng nên gửi Gerber, drill, stackup, assembly drawing, centroid, and panel constraints.
Đội mua hàng nên gửi BOM with QFN/LGA datasheets, approved alternates, MSL class, and sourcing preference.
Đội mua hàng nên gửi stencil file if available, or paste-layer notes for aperture reduction and thermal pad targets.
Đội mua hàng nên gửi X-ray acceptance criteria, voiding expectation, test requirement, and sample approval process.
Đội mua hàng nên gửi MOQ, annual forecast, target sample date, production release date, and shipment split plan.
The response is built for procurement, quality, and engineering review.
Bạn sẽ nhận phản hồi 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 Việt Nam.
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.
Lắp ráp QFN là quy trình SMT cho package quad flat no-lead, nơi mối hàn nằm ẩn dưới mép linh kiện. 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
