SMT Line (printer, SPI, placement, reflow, AOI)

Selection criteria

Paste-volume inspection, placement accuracy, reflow profile, AOI coverage.

Supply chain

Shenzhen and Dongguan host strong domestic makers of printers, reflow ovens and inspection equipment, plus offices of Korean and Japanese brands. For Hall boards, the keys are placement accuracy and AOI coverage of Hall IC orientation.

Buyer FAQ

What placement accuracy do Hall sensor boards need?

Any modern placement machine (about ±0.05 mm) easily handles SOT-23 Hall ICs and 0402 passives. What matters is the Hall element's position relative to the board datum and the rotor magnet, so specify a positional tolerance such as ±0.1 mm and require 100 % AOI of Hall IC orientation and polarity.

What reflow profile and paste inspection limits are typical?

For SAC305 lead-free paste, a typical profile peaks at 235–250 °C with 45–90 s above the 217 °C liquidus and a ramp of no more than 3 °C/s. SPI commonly accepts paste volume within about 70–150 % of nominal. Store and bake Hall ICs according to their moisture sensitivity level (MSL) to avoid cracking.

Do I need an imported SMT line for motor Hall boards?

Usually not. Hall boards carry few components, so a mid-speed line is enough, and Chinese printers, reflow ovens, SPI and AOI are widely used in production. Spend instead on AOI coverage, ESD control and lot traceability; domestic equipment also ships and is serviced faster.

Where it is used