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A finished populated circuit board assembly lying flat on a white engineering bench beside an open digital caliper

Product category · Group C · electronics manufacturing

PCB fabrication & PCBA

Four supplier sites fabricate from 1 to 58 layers and assemble on up to nine SMT lines, to the acceptance class you write into the purchase order.

Send us your Gerber and BOM The four sites
Layer count
1–58layers
Single-sided through to 58-layer multilayer, plus HDI, flex and rigid-flex
Assembly lines
9+ 4–5 DIP
On one site, lead-free on all nine lines; eight automated SMT lines on another
Placement
80,000CPH
Single-line placement rate; 75,000 CPH down to a 0201/01005 minimum component
Minimum order
0MOQ
One prototype or ten thousand units on the same line, with no subcontracting

01Connection layer · what we supply

Fabrication, from one layer
to fifty-eight.

4 sites9 SMT linesno MOQ
A finished populated circuit board assembly lying flat on a white engineering bench beside an open digital caliper FAB-01

Multilayer & HDI fabrication

1–58 layersHDI0.1 mm trace/space0.15 mm drill0.2–3.2 mm thick1–8 oz copper

Made by Saturn PCBA · Whale PCBA · Uppcba · Group C

A finished populated circuit board assembly standing upright with a matte black heatsink across its upper half and a row of connectors along the lower edge FAB-02

Flex & rigid-flex

IPC-6013FRigid-flexFPCSensor & radar modules

Made by Kingdta · Group C, Simplified Chinese site

A close view down one SMT line with pick-and-place heads and feeder reels in strict alignment FAB-03

Materials & finishes

FR-4 baselineHigh-TgHigh-frequencyENIGOSPHard goldENEPIG

Quoted per design · Group C

A production panel of identical printed circuit boards held in a white inspection fixture with gold pads and teal solder mask FAB-04

Panel sizes and tolerances

600 × 1200 mm560 × 1150 mm multilayerPTH ±0.08 mmNPTH ±0.05 mm

Flying-probe test and AOI included · Group C

02Connection layer · assembly and test

Assembly, test
and the box around it.

SMTDIPbox build
A close view down one SMT line with pick-and-place heads and feeder reels in strict alignment ASM-01

SMT assembly

9 lead-free lines8 automated lines80,000 CPH0201 / 010053D SPI · AOI · X-Ray

Made by Saturn PCBA · Whale PCBA · Uppcba · Group C

A finished populated circuit board assembly standing upright with a matte black heatsink across its upper half and a row of connectors along the lower edge ASM-02

DIP, mixed assembly & box build

4–5 DIP lines6 DIP lines at KingdtaConformal coatingIC programmingCable & harness

Through-hole to a finished unit · Group C

A production panel of identical printed circuit boards held in a white inspection fixture with gold pads and teal solder mask ASM-03

DFM review before production

Free engineer-led reviewReturned in 24 hNDA available

Every design reviewed before scheduling · Group C

A lot tag on a sealed string, an SMT batch tray of populated assemblies, a functional-test fixture, a sealed module and a plain carton in one level row ASM-04

Batch traceability

MES traceabilityFCT testingLot to carton

A field failure traces to a build record · Group C

03Connection layer · who builds it

The four named sites
behind this category.

4 sitesGroup C1 contract
A production panel of identical printed circuit boards held in a white inspection fixture with gold pads and teal solder mask

Saturn PCBA

Fabrication and PCBA from Shenzhen since 1998: multilayer, HDI, flex and rigid-flex, then turnkey box build.

1–58 layers9 SMT + 4–5 DIP80,000 CPH60+ countries

ISO 9001:2015 · UL 796 · IPC-A-610 Class 2 & 3 · J-STD-001 · IPC-A-600 / IPC-6012

A close view down one SMT line with pick-and-place heads and feeder reels in strict alignment

Whale PCBA

Prototype to mass production on 2–32 layer PCBs and eight fully automated SMT lines, with DFM back in 24 hours.

80,000 m²/month8 M placements/day98.7% on-time30+ countries

ISO 9001:2015 · ISO 14001:2015 · IATF 16949:2016 · ISO 13485:2016 · IPC-A-610 Class 3

A finished populated circuit board assembly standing upright with a matte black heatsink across its upper half and a row of connectors along the lower edge

Uppcba

SMT, DIP, mixed assembly and box build with no minimum order quantity and no subcontracting.

No MOQ10,000+ projects99.7% first-pass yield75,000 CPH

ISO 9001:2015 · ISO 13485 · IPC-A-610 Class 3 · UL · RoHS

A lot tag on a sealed string, an SMT batch tray of populated assemblies, a functional-test fixture, a sealed module and a plain carton in one level row

Kingdta

Vibration, angle and radar sensor modules with PCB, FPC and PCBA as a single solution. Site publishes in Simplified Chinese only.

6 SMT + 6 DIP lines±0.03 mm accuracy24 h response

ISO 9001 · RoHS · REACH · IPC-A-610 · MES traceability with FCT testing

04Trust layer · standards

Which document governs
which stage.

IPCacceptance classrevisions dated
A flat flow diagram of five blank plates in one row connected by short arrows, the third plate outlined in teal
Fig. A Five stages your PO has to name.
AcceptanceIPC-A-610JRevision J, March 2024, 430 pages. Its own §1.1 gives no criteria for cross-sections or X-ray.
ProcessJ-STD-001JRevision J, March 2024, 116 pages. Unspecified classes must wet more than 50% of a thermal plane.
Bare boardIPC-6012F and IPC-A-600MIPC-6012F runs 80 pages; IPC-A-600M is Revision M, May 2025.
ReworkIPC-7711 / 7721DRevision D, December 2023. Flex moved to IPC-6013F on 2026-08-25.
A close view down one SMT line with pick-and-place heads and feeder reels in strict alignment
Fig. B A facility registration is site-specific.
Certification, two kindsPersonnel vs facilityCSE, CIT and CIS are personnel certificates. Facility registration is IPC Validation Services QML/QPL.
Who chooses the classYou doIPC states the user is responsible for defining the product class.

05Inputs · what to send us

What to send us.

4 inputsthen a DFM review
An engineering bench under an inspection lamp with a finished circuit board assembly, a magnifier arm and sample connectors
Fig. B A written assessment before production.
01Gerber or CAD sourceAltium, KiCad or Eagle, with the fabrication drawing and stackup.
02BOM and assembly drawingManufacturer part numbers, approved alternates, polarity notes.
03Acceptance classThe class for the PO, plus any exceptions to it.
04Volume, market, IncotermAnnual volume, first order, target cost, FOB or FCA.
An engineering bench under an inspection lamp with a finished circuit board assembly, a magnifier arm and sample connectors
Fig. C A written assessment before production.
A lot tag on a sealed string, an SMT batch tray of populated assemblies, a functional-test fixture, a sealed module and a plain carton in one level row
Fig. D Bare-board lot, SMT batch, test record, carton.

06Execution layer · how we carry it

Four services carry
a fabrication order.

6 service lines1 contract
Two technicians seen from behind at a bench, one holding a document of grey placeholder bars and the other pointing at it SVC-01

Sourcing & matching

Four sites, four different envelopes.

We match layer count, line count and certification set to your design, not to whoever answers first.

An engineering bench under an inspection lamp with a finished circuit board assembly, a magnifier arm and sample connectors SVC-04

Technical assessment

A stackup nobody read before tooling.

Our own PCB & PCBA factory is the baseline our engineers assess a partner's board against.

Digital calipers closed around a machined aluminium housing beside a blank inspection checklist and a sealed sample bag SVC-05

Production follow-up & QC

A defect call relayed by someone who cannot judge it.

A 1,201–3,200 piece lot samples 125 pieces at general level II; AQL 2.5 accepts 7 and rejects 8.

An export loading bay with an open container onto a pale apron and unlabelled cartons on pallets SVC-06

Export execution

Classification discovered after the quote.

FOB by default, FCA for inland stuffing. The HS line is confirmed at quotation, not at the port.

07Start

Send us your Gerber and BOM.

Name the acceptance class you want in the purchase order, and we will route it to the site that builds to it.

Recorded. An engineer will reply.

Written technical assessment, from eric@dfshk.cn.

The spec sheet: what to send us eric@dfshk.cn · +86 152 3512 7440