Part 15: the class is a marketing limit
Class A is equipment marketed for commercial, industrial or business use, and cannot be sold into the residential market.
Product category · Group E · embedded & other
Twenty-eight models across six form factors, qualified from −20 °C plant floors to +60 °C cabinet air on a 9–36 V DC rail.
01Connection layer · what we supply
| Form factor | Where it goes | What decides the choice |
|---|---|---|
| 2.5-inch SBC | Compact instruments and gateways | The smallest format in the line-up |
| 3.5-inch SBC | Kiosks, HMIs and vehicle systems | The workhorse format |
| 3.5-inch Wide | The same jobs with more margin | Wider input and thermal headroom |
| NANO-ITX | Small industrial boxes and signage | A standard mounting pattern |
| Mini-ITX | Systems that need expansion | Standard mounting and expansion slots |
| NUC | Digital signage and edge boxes | Small and serviceable compute module |
02Connection layer · who builds it
Industrial motherboards in six form factors, built for wide temperature and wide-voltage DC input, with OEM/ODM customisation.
SMT, assembly, burn-in and packaging sit under one roof in Shenzhen, so a process change shows up in the records rather than in a field failure.
03Decision layer · industrial suitability
04Trust layer · compliance
Class A is equipment marketed for commercial, industrial or business use, and cannot be sold into the residential market.
Most unintentional radiators may take either a Supplier's Declaration of Conformity or Certification. Scanning receivers and radar detectors must be certified.
A board inside a finished appliance is assessed as part of that appliance under IEC/UL/EN 62368-1, on the 4th-edition dates.
Catalogue products need CCC for the China market. It is a separate approval from CE or FCC.
05Execution layer · how we carry it
SVC-01
A part that is right today and gone in three years.
We match the format to your enclosure and the BOM to parts that will still be buyable.
SVC-04
A thermal design that only works on a desk.
The engineers who assess our own boards review the stackup, the thermal path and the alternates with you.
SVC-05
A functional test nobody wrote down.
Pre-shipment inspection to ISO 2859-1 general level II, with functional testing to your test plan where you supply one.
SVC-06
A classification that changes with the enclosure.
FOB by default, FCA for inland stuffing. The classification follows the machine the unit is built into.
06Inputs · what to send us
07Start
Name the form factor or attach the drawing. An engineer replies with a written assessment.
Written technical assessment, from eric@dfshk.cn.
Start · short form
One line is enough to start. An engineer answers, not a chatbot.
We answer from eric@dfshk.cn. If you have a drawing or a spec sheet, reply to that message and attach it.