Smartron Technology

Quote the flex circuit and its assembly interface together.

Suzhou Smartron Technology — 苏州市华扬电子有限公司 — describes a business founded in 1998 that supplies flexible circuits and surface-mount products. Its company account says it became a wholly owned subsidiary of Hongxin Electronics in 2022. The contact page places the company at 50 Muxiang Industrial Area, Huangqiao, Xiangcheng District, Suzhou. Its catalogue is organised as single-sided, double-sided and multilayer FPCA + HOT-BAR, with notebook lighting, phone antennas, automotive and signal-interconnect examples.

For this supplier, the useful starting point is the delivered assembly: bare FPC, populated flex, or a flex already joined to another part. Send the mechanical drawing, stack, component list and joint drawing with the electrical requirements. A layer count alone leaves the stiffeners, coverlay openings, component orientation and joint inspection unresolved.

A keyboard-backlight panel and an automotive-light strip need different release tests.

Double-sided Mini LED RGB CSP keyboard backlight

Flex construction

PI + ED copper + coverlay + solder mask

Board geometry

0.17 mm thick · 340 × 117 mm

Line / space and finish

0.10 / 0.10 mm · chemical gold

LED package / component size

CSP · 1.0 × 1.0 × 0.2 mm

Release the LED binning, colour and brightness acceptance, drive current, polarity and completed-keyboard fixture. Agree how populated-panel handling prevents distortion or component damage. The component dimensions are not the PCB thickness or a stated pad pitch. The original panel also says a 0.2 mm minimum hole; it does not define this as the finished plated-hole diameter.

Select keyboard-backlight FPCA →

Single-sided automotive LED-light FPC

The manufacturer lists PI + RA copper + white coverlay + aluminium sheet, 0.16 mm board thickness, a 37 × 235 mm outline, 0.4 / 0.2 mm line/space and OSP. Keep the aluminium sheet in the assembly specification; this label does not establish a metal-core PCB construction or a measured thermal resistance.

Define attachment, thermal contact, connector access and installed bend geometry. Request the assembled-light inspection and environmental tests your lamp requires. The catalogue gives no aluminium thickness, LED operating temperature or finished-lamp approval.

Select automotive-light FPC →

Two double-sided boards, two different acceptance questions.

Wireless-charging and NFC FPC

PI, ED copper and coverlay; 45 µm copper, 0.18 mm board thickness, 69 × 56 mm, gold plating. The printed line/space is 0.6 / 0.10 mm. It is retained exactly, rather than changed to a more impressive-looking value.

Release the antenna/coil artwork, final housing and mating interface. Agree how the completed assembly will be checked for its intended charging or communication function. No charging power, RF tuning result, shielding arrangement or dynamic-flex rating is supplied for this example.

Select charging / NFC FPC →

Automotive power-control FPC

PI, ED copper and coverlay; 0.16 mm thick · 398 × 55 mm, 0.3 / 0.2 mm line/space and OSP. This is a manufacturer-labelled automotive application; its title does not supply a voltage, current, insulation rating or functional-safety qualification.

State the installed bend, soldering sequence, environmental exposure and insulation/electrical test. Ask which sample and production records must accompany the automotive release, and identify the contracting production site.

Select automotive-control FPC →

Shielding and ACF need defined interfaces, not just a material label.

Three-layer signal-transmission FPC

PI + RA copper + coverlay + shielding film; 0.3 mm thick, 19 × 49 mm, 0.06 / 0.07 mm line/space and chemical gold. The printed 0.1 mm hole minimum is not expressly a finished plated-hole value.

Release shield termination, connector geometry and the controlled electrical stack. Agree continuity, channel or EMI acceptance on the finished assembly when required. Shielding film is not a measured EMI result, and the catalogue supplies no impedance target or insertion-loss report. Identify whether the intended bend is a one-time installation or repeated motion.

Select shielded signal FPC →

Single-sided ACF-test FPC

PI + RA copper + coverlay; 0.10 mm thick, 35 × 36 mm, 0.08 / 0.06 mm line/space and chemical gold. The supplier names the application ACF test; this is not a disclosed adhesive grade or complete bonding process.

Provide the mating-pad map, adhesive requirement and controlled bonding trial. Specify contact-resistance acceptance, inspection and reliability checks. Agree which trial conditions and results are retained before a repeat production release.

Select ACF-test FPC →

Connect the listed equipment to the acceptance plan.

For a repeat order, request the approved stack, component and material substitutions, fixture revision, inspection plan and sample-to-production release. Define which engineering changes require approval and how the shipment identifies the relevant manufacturing lot. The website’s “high quality, quick delivery” slogan is not a lead-time commitment; put the quantity, approved materials and promised delivery date in the quotation.

Qualify the site and the actual construction on your order.

A Guosen Securities verification opinion hosted by the Shenzhen Stock Exchange in May 2022 identifies the FPC production project in Muxiang, Huangqiao and discusses the company’s history and environmental procedures. Printed pages 32–33 describe customer qualification through initial review, site audit, sample approval and supplier acceptance. This is a dated transaction record, not proof that your product or current supplier onboarding has passed those stages.

These are readable manufacturer-hosted copies, not current issuer verification by PCBVerified. For your selected construction, request the applicable site, scope and UL type when required, plus the stack, assembly drawing and shipment inspection records. Start with the relevant product above so the factory can respond to a concrete interface and test plan.

Sources behind this profile

Individually researched 8 October 2026. Six original product panels were read separately; their numerical text is transcribed for each example. Unspecified plated-hole and impedance values remain unknown. Buyer assembly and release questions are editorial guidance. Historical reports, planned MES and certificate copies remain distinct from current independent verification.

1. ManufacturerCompany, 1998 history and Hongxin relationship ↗
2. ManufacturerSingle-sided FPCA / HOT-BAR catalogue ↗
3. ManufacturerDouble-sided FPCA / HOT-BAR catalogue ↗
4. ManufacturerMultilayer FPCA / HOT-BAR catalogue ↗
5. ManufacturerMini LED RGB CSP keyboard panel and original specifications ↗
6. ManufacturerWireless-charging and NFC original specification panel ↗
7. ManufacturerAutomotive power-control original specification panel ↗
8. ManufacturerThree-layer signal original specification panel ↗
9. ManufacturerAutomotive LED-light original specification panel ↗
10. ManufacturerACF-test original specification panel ↗
11. ManufacturerEquipment gallery and second page ↗
12. ManufacturerERP, SAP, OA and planned MES diagram ↗
13. ManufacturerQualification copies and UL printout ↗
14. ManufacturerSuzhou contact address ↗
15. Exchange-hosted adviser recordMay 2022 verification opinion, printed pages 4–5,18–19,32–33 ↗