29 design-for-manufacturability checks specific to AI devices. Catch problems before they cost you a mold revision.
Is there a thermal simulation or estimate for your SoC under peak AI inference load?
Why it matters
Edge AI chips (RK3588S, QCS6490) can hit 85°C+ during sustained inference. Without thermal planning, you'll throttle or fail reliability tests.
How to fix
Run thermal simulation early. Budget 2–5mm for heat spreader or thermal pad in your stack-up.
Is there adequate PCB copper pour for heat dissipation under the SoC?
Why it matters
The PCB is your primary heatsink in compact devices. Insufficient copper pour causes hot spots and solder joint fatigue.
How to fix
Use thermal vias (array of 0.3mm vias) under the SoC pad, connected to an internal ground plane.
Have you verified the enclosure material can handle the operating temperature?
Why it matters
ABS softens at 80°C. If your SoC runs hot, the enclosure near the chip can deform or discolor.
How to fix
Use PC (polycarbonate) or ABS/PC blend for areas near heat sources. Add ventilation slots if >3W sustained.
Is the battery positioned away from heat-generating components?
Why it matters
LiPo batteries degrade rapidly above 45°C and can swell or fail. Thermal runaway is a safety hazard.
How to fix
Maintain ≥3mm air gap or thermal barrier between battery and SoC. Never stack battery directly under the processor.
Is there a ground clearance zone around all antennas (WiFi, BLE, cellular, GPS)?
Why it matters
Metal near antennas kills performance. The #1 cause of failed FCC/CE tests is antenna detuning from nearby copper or enclosure metal.
How to fix
Keep ≥5mm copper-free zone around 2.4GHz antenna. 10mm for cellular. No ground plane under the antenna element.
Is the antenna placement compatible with typical user grip/wear positions?
Why it matters
Human body absorbs RF. A wrist-worn device with the antenna on the skin side will lose 6–10dB signal.
How to fix
Place antenna on the side facing away from the body. Test with phantom hand/body during development.
Have you accounted for antenna detuning from the enclosure material?
Why it matters
Plastic enclosures shift antenna resonant frequency. Metal-painted or metallized plastics can block RF entirely.
How to fix
Avoid metallic paint near antennas. Tune the antenna with the final enclosure material, not in free space.
If using cellular (4G/5G), is there sufficient antenna volume for the required bands?
Why it matters
Multi-band cellular needs ~500–1000mm³ of antenna volume. Undersized antennas cause dropped calls and failed carrier certification.
How to fix
Allocate antenna volume early in ID design. Consider FPC (flex PCB) antenna if space is tight.
Have you profiled the power consumption across all operating modes (sleep, active, AI inference)?
Why it matters
AI inference can draw 10–50× more current than idle. Without profiling, your battery life claims will be wrong and your regulator may be undersized.
How to fix
Measure current in each mode. Size the regulator for peak (not average) current. Design a power state machine in firmware.
Is your USB-C charging circuit designed to handle the battery safely?
Why it matters
Incorrect charging IC selection or missing protection can cause battery swelling, fire, or regulatory failure.
How to fix
Use a certified charging IC (TP4056 minimum, IP5306 for power path). Add over-voltage, over-current, and thermal cutoff protection.
Are voltage rails sequenced correctly for the SoC and peripherals?
Why it matters
Many SoCs require specific power-up sequences (core → I/O → memory). Wrong sequence causes latch-up or silicon damage.
How to fix
Read the SoC datasheet power sequencing section. Use PMIC with sequencing support or add enable-chain delays.
Have you added a fuel gauge or voltage-based battery level indicator?
Why it matters
Without accurate battery reporting, users can't trust your device. LiPo voltage curves are non-linear.
How to fix
Use a coulomb counter IC (MAX17048) for accuracy, or implement a voltage lookup table with load compensation.
Do all plastic walls meet minimum thickness for injection molding (≥1.0mm)?
Why it matters
Walls thinner than 1.0mm cause short shots (incomplete fill) and sink marks. Shenzhen tooling houses will reject or charge extra.
How to fix
Maintain 1.2–1.5mm wall thickness for ABS/PC. Keep uniform thickness to prevent warping.
Are there draft angles (≥1°) on all vertical surfaces for mold release?
Why it matters
Without draft, parts stick in the mold, causing scratches, deformation, and slow cycle times (higher cost).
How to fix
Add 1–3° draft angle on all walls. Textured surfaces need more draft (1° per 0.025mm texture depth).
Is the snap-fit or screw boss design validated for repeated assembly/disassembly?
Why it matters
Service, RMA, and regulatory testing require opening the device. Snap-fits that break on first open are a production nightmare.
How to fix
Design snap-fits with 2% max strain for ABS. Add screw bosses as backup. Test with 20+ open/close cycles.
Is there adequate space for FCC/CE/UL markings on the enclosure?
Why it matters
Regulatory marks must be permanent and legible. If your enclosure is too small, you'll need to redesign at certification stage.
How to fix
Reserve a 15×8mm flat area for laser-engraved or pad-printed regulatory marks. Plan this in the ID phase.
Have you specified IP rating requirements and designed sealing accordingly?
Why it matters
Wearables often need IPX4 (splash) minimum. Adding waterproofing after design is extremely expensive.
How to fix
Define IP rating early. IPX4 needs gaskets at seams. IPX7 needs O-rings, sealed connectors, and pressure-tested enclosures.
Are high-speed signals (USB, MIPI, DDR) properly impedance-matched?
Why it matters
Impedance mismatch causes signal reflections, data errors, and EMI. USB/MIPI/DDR will fail at speed without controlled impedance.
How to fix
Use impedance-controlled stackup. 90Ω differential for USB, 100Ω for MIPI. Specify in PCB fab notes.
Are decoupling capacitors placed within 2mm of each power pin?
Why it matters
Long traces to decoupling caps add inductance, causing voltage droop during current spikes (especially during AI inference bursts).
How to fix
Place 100nF caps within 2mm of every power pin. Add bulk caps (10–100µF) near the voltage regulator output.
Is the microphone placement optimized for acoustic performance?
Why it matters
MEMS mics are extremely sensitive to placement. Sound ports blocked by enclosure, or mics near vibration sources, kill voice AI accuracy.
How to fix
Align mic sound port with enclosure hole (≤0.5mm offset). Add acoustic chamber (1–2mm air gap). Keep away from speaker and motor.
Are test points accessible for production testing (ICT/flying probe)?
Why it matters
Without test points, you can't verify boards in production. You'll rely on functional testing only, which is slower and catches fewer defects.
How to fix
Add test pads for all power rails, key signals, and programming interfaces. Minimum pad size 1.0mm for flying probe.
Is the PCB panelized efficiently for SMT production?
Why it matters
Poor panelization wastes PCB material and slows pick-and-place setup. Non-standard panels add NRE charges at the SMT house.
How to fix
Design panel with 3–5mm rails, V-score or tab-routing. Keep panel size within 100×100mm to 250×330mm for standard SMT lines.
Is there a reliable firmware update mechanism (OTA or USB)?
Why it matters
You will ship bugs. Without OTA, every firmware fix requires physical recall or customer-side USB flashing — both are expensive.
How to fix
Implement dual-bank OTA with rollback. Test update failure scenarios (power loss mid-update, corrupted image).
Have you implemented factory calibration and provisioning in the production flow?
Why it matters
Each unit needs unique credentials (device ID, certificates, WiFi provisioning). Manual provisioning doesn't scale past 100 units.
How to fix
Build a factory tool that programs credentials, runs self-test, and logs results — all in <30 seconds per unit.
Is your AI model optimized for the target SoC (quantized, pruned)?
Why it matters
Running an unoptimized model on edge hardware will drain battery 3–5× faster and cause thermal issues.
How to fix
Quantize to INT8. Use the SoC vendor's NPU SDK (RKNN for Rockchip, TFLite for ESP32). Profile inference time and power.
Have you identified all required certifications for your target markets?
Why it matters
Missing certifications = can't sell. FCC (US), CE (EU), SRRC (China), MIC (Japan) each have different requirements and timelines.
How to fix
Map target markets → required certs at project start. Budget 8–16 weeks and $8K–40K for testing.
Does your design meet EMI limits without requiring a shield can?
Why it matters
Adding shield cans late in development adds cost ($0.50–2/unit), height, and requires PCB redesign for grounding.
How to fix
Follow EMI best practices from the start: solid ground planes, short return paths, filtered I/O. Pre-scan with near-field probe.
Is your battery compliant with UN38.3 transportation testing?
Why it matters
Lithium batteries without UN38.3 certification cannot be shipped by air. Your entire supply chain depends on this.
How to fix
Source batteries from suppliers who provide UN38.3 test reports. Budget $2K–5K if you need to test a custom cell.
Have you considered data privacy regulations (GDPR, CCPA) for your AI device?
Why it matters
AI devices that record audio/video face strict privacy requirements. Non-compliance can result in fines and market bans.
How to fix
Implement on-device processing where possible. Add clear privacy controls, data deletion, and consent flows.
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This checklist covers common AI hardware DFM issues. Your specific design may have additional requirements. Contact us for a comprehensive review.