An AI server card is a hard board to build. It mixes fine-pitch digital parts with heavy copper for power. It also needs tight control over high-speed traces and over heat.
This article covers what these boards ask. It looks at assembly support, part supply, and quality records.
What AI Server and Telecom Boards Ask From PCBA Support
The board looks like a normal SMT job at first. Then the special items appear.
- High layer count. Network and switch cards often run 12 to 20 layers. Microvias and via in pad are common.
- Fine pitch. Dense BGA parts at 0.65 mm leave little room for error.
- Controlled impedance. 85 ohm and 100 ohm pairs need a fixed stackup. Line width must be verified.
- Backdrilling. Stub removal keeps 200Gb/s channels clean and cuts insertion loss.
- Heavy copper. Power and ground layers carry high current. That means more heat in the joint.
- Thermal pads. Void control under power parts decides the real thermal path.
- Mixed technology. Fine pitch SMT sits beside through-hole power connectors and press-fit pins.
- Low-loss material. High-speed material needs its own reflow and handling profile.
Each item changes the process. Paste volume gets smaller. Placement accuracy gets tighter.
Where These Boards Usually Fail
| Paste volume drift | Small apertures lose volume over a print run. That opens joints on fine pitch parts. |
| Voids under power pads | Voids raise thermal resistance and show up as hot spots later. |
| Board flatness | Heavy copper and heat can bow a large panel before placement. |
| Flux residue | Residue on high-speed traces adds loss and leakage risk. |
| Unclear stackup data | A missing coupon or note leaves impedance unproven. |
Part Supply for These Boards
The BOM for a NIC or a telecom board is uneven. A few high-value parts sit on top of a long tail.
The important parts are easy to name. A digital multi-phase controller. DrMOS stages. A retimer or a clock part. Power modules and board connectors.
The small parts cause the delays. An LDO, an oscillator, or a connector can stop a build. None of them costs much. Any of them can hold the line.
- Long lead times. Power ICs and retimers can quote 26 to 52 weeks.
- End of life mid-programme. A part can reach last time buy while the product still ships.
- Not a drop-in swap. A new controller often needs a configuration image and a firmware check.
- Layout impact. A different pin layout or package forces a board change. That forces a new qualification round.
- Documented route. End customers audit the BOM. A clear supply channel and lot records matter there.
- Original packaging. Some customers ask for factory packing and full date code data.
The best moment to test an alternative is the prototype stage. A change there costs a build. A change at volume costs a programme.
Small Batch, Prototype, and Ramp
Most AI hardware programmes start small. A few boards prove the design. Then volume arrives later.
Small batches carry their own economics. Stencil, programme setup, and panel cost spread over few units. Panel utilisation then drives the unit price more than any other factor.
- Keep one process. Run the prototype and the volume build on the same line. The data then matches.
- Freeze the BOM early. Every change after ramp adds cost and risk.
- Plan test access. Test points and fixtures are easier to add at design stage.
- Hold the tooling. Keep stencils, programmes, and fixtures for the next run.
- Check the first article. Inspect the first board against the drawing before the run continues.
- Ramp with margin. A backup line and a small part buffer beat an expedite fee.
A clean package speeds the review. Send the Gerber, the BOM, the placement file, and the target date.
Quality Control and Traceability
An AI board carries expensive parts. A rework is costly, and a field failure is worse.
Inspection through the line
| Solder paste inspection | Catches low volume and missing paste on fine pitch pads. |
| Automated optical inspection | Finds placement and polarity faults after reflow. |
| X-ray | Checks BGA joints and voids under thermal pads. |
| In-circuit test | Confirms nets, values, and joint continuity. |
| Functional test | Runs the board at its real load and link speed. |
Records that matter
- Lot to unit link. Each unit maps back to its part lots and date codes.
- Process records. Reflow profiles, paste lots, and machine settings stay on file.
- Rework log. Every rework is recorded, not hidden.
- Moisture control. MSL parts are stored and baked to rule, with dry pack records.
- ESD control. Floor, wrist strap, and packing checks are documented.
- Change control. Any material or process change needs written approval.
A report pack makes the difference at audit. First article report, inspection images, and test logs answer most customer questions.
FAQ
What files do you need to review a board?
Gerber, BOM, pick-and-place data, quantity, and the target date.
Do you take small prototype runs?
Yes. Samples and pilot builds are a normal part of the flow.
Can you source the parts as well as build the board?
Yes. Part supply runs beside the assembly work, including long-lead and hard-to-find items.
How do you handle a part that has gone end of life?
We look for a workable option first. Where a swap is needed, we review it first.
Send your BOM or Gerber. You will get a quote within hours.
