Stencil and paste
Set aperture strategy, stencil thickness and paste family from pad geometry, package mix and thermal demand.
PCB Assembly technology / surface mount
SMT Assembly Services
SMT assembly services turn stencil, package, placement and thermal decisions into a controlled build route for prototypes and repeat production.
Paste printAperture and support
PlacementPackage-aware setup
ReflowProfile by assembly
InspectionPlan by risk
At a glance
What Is SMT Assembly?
SMT assembly places surface-mount components onto a printed circuit board through a controlled print, placement and reflow process. Feasibility depends on the package mix, land patterns, board construction, thermal limits and the inspection or test evidence required for the build.
Engineering choices
Control the interfaces before placement starts.
Fine-pitch results depend on the whole print-to-reflow chain. The package library, pad design, stencil, board support and inspection method should be reviewed as one system.
Centroid and package data
Resolve rotation, polarity, origin and package-library mismatches before the program reaches the line.
Reflow profile
Define the profile around component limits, board mass, finish and solder alloy instead of applying one generic recipe.
SMT plus through-hole
Sequence secondary-side SMT, selective soldering or hand operations so later steps do not disturb earlier joints.
Technical reference
SMT process reference
This reference describes the data and process controls needed for a credible quotation. Exact package, pitch, panel and board limits are confirmed after file review.
SMT process reference
Use this as a quotation checklist; exact package, pitch, panel, inspection and test limits require the released files.
| Quote inputs | Gerber or ODB++, BOM, CPL/centroid data, assembly drawing and available test requirements |
|---|---|
| Package review | Chip, leaded, bottom-terminated and array packages evaluated against land pattern and inspection access |
| Board construction | Rigid, flex or rigid-flex assembly reviewed for support, handling and thermal exposure |
| Solder system | Lead-free or leaded route selected by product requirement and approved material set |
| Stencil strategy | Aperture, thickness and stepped-stencil needs reviewed from the package mix |
| Reflow control | Profile established for assembly thermal mass, components and solder-paste requirements |
| Inspection | SPI, AOI, X-ray or manual methods selected where they can detect the defined risks |
| Test interface | ICT, flying-probe, programming or functional test supported when fixtures, limits and procedures are available |
Design context
A placement file is only one part of the build definition.
The CAD, BOM, fabrication data and drawing must describe the same design revision. A technically clean SMT launch resolves mismatched designators, polarized parts, do-not-populate positions and special handling before material is released.
- Confirm reference designator and quantity consistency
- Review bottom-terminated and fine-pitch inspection access
- Identify moisture-sensitive and temperature-limited devices
- Define panel support and fiducial strategy
Engineering review
What the SMT engineering review should close
The quote and build plan become meaningful only when the assembly package is internally consistent.
BOM, CPL and drawing revision alignment
Package orientation and polarity definition
Stencil and solder-paste route
Board support and panel handling
Reflow-sensitive component constraints
Inspection and test coverage by risk
Practical fit
Where SMT assembly fits
Use the process when compact component density, repeatable automated placement or double-sided assembly drives the build.
Control electronics
Dense digital and mixed-signal control boards with defined programming and functional checks.
Communication hardware
Assemblies with shielded areas, array packages and impedance-sensitive board construction.
Instrumentation
Low-volume and repeat builds where revision control and traceability matter as much as placement.
Frequently asked questions
Questions that shape the smt assembly services route
Use these SMT answers to prepare the placement package and identify process controls that still need engineering review.
What files are needed for an SMT assembly quote?
Provide fabrication data, BOM, CPL or centroid data, assembly drawings and the available test or programming requirements. A mismatch between those files is resolved before the build route is confirmed.
Can you assemble fine-pitch and BGA packages?
Fine-pitch and array packages can be evaluated. Feasibility depends on the land pattern, stencil strategy, board construction, component availability and the inspection access required for that design.
Do all SMT assemblies receive the same inspection?
No. Inspection is selected from the package and defect risks. SPI, AOI, X-ray, manual inspection and electrical or functional testing each cover different failure modes.
How is the assembly schedule confirmed?
The schedule is confirmed after file consistency, material availability, process route, fixture needs and the inspection or test plan have been reviewed.
Related pages
Connect SMT decisions to the next assembly route.
Move from surface-mount process questions to capability, prototype, turnkey and material decisions with the existing Assembly pages.
PCB Assembly
PCB Assembly Capabilities
PCB assembly capabilities for SMT, THT/DIP, BGA, QFN and mixed technology, with 01005 placement, inspection, testing, 24-hour quote targets and PCBA lead times.PCB AssemblyTurnkey PCB Assembly
Turnkey PCB assembly services with component sourcing, PCB fabrication, BOM control, SMT or THT assembly, programming, inspection and agreed test evidence.PCB AssemblyPrototype PCB Assembly
Prototype PCB assembly for engineering samples, NPI and pilot builds, with BOM and file review, sourcing controls, issue capture and repeat-build transfer.PCB AssemblyElectronic Component Sourcing Services
Electronic component sourcing services for PCBA BOMs, including part normalization, alternate approval, incoming checks and order-specific traceability.Review the files for an SMT assembly route.
Share fabrication data, BOM, CPL, drawings and the available inspection or test requirements with the PCBArise team.