SMT & PCB Assembly
Board assembly runs on partner SMT lines in Taiwan — automated placement with AOI — and lands in our integration flow, so the board that passes inspection is the board that goes into your enclosure.
Partner lines, one accountable party.
Essen doesn't own reflow ovens, and says so. Board assembly is placed with vetted partner facilities whose lines we've qualified — automated SMT placement with automated optical inspection (AOI) at board level. What we own is the outcome: the BOM lock, the build coordination, the inspection criteria, and the accountability when something's wrong.
Workmanship: electronic assembly is performed to IPC-A-610 Class 2 acceptability standards — the standard for dedicated-service electronics. If your program requires Class 3, raise it in the RFQ and we'll answer honestly about fit.
Consigned or turnkey: we can source the full BOM, build with components you consign, or split it — itemized line-by-line in the quote.
What PCBA means, and how it differs from PCB.
PCBA stands for printed circuit board assembly — a board that has been populated with components. A PCB is the bare board on its own: laminate, etched copper, solder mask, silkscreen, and drilled holes, with nothing mounted on it. PCBA manufacturing is the step that turns one into the other.
The distinction matters commercially because the two are quoted from different data. Bare-board fabrication is quoted from Gerbers or ODB++. Assembly needs those plus a bill of materials and centroid (pick-and-place) data giving the XY position and rotation of every part — which is why a quote request with Gerbers alone comes back with questions rather than a price.
The electronic assembly steps
Surface-mount content is stencil-printed with solder paste, placed on an automated line, and joined by reflow. Through-hole content is joined separately by wave, selective, or hand soldering — a distinction worth knowing, because a board with mixed technology carries more process steps and more cost than its placement count suggests. Boards are inspected by AOI, cleaned where the flux system requires it, and electrically tested to the criteria agreed for your program.
From there, boards either ship as populated assemblies or continue into box-build integration — mounted into the enclosure with the display, harness, and power, then functionally tested as a finished unit.
Boards are the middle of the story.
Most PCBA programs here are part of a box build — the board goes from the SMT line into the enclosure, gets your firmware, and ships as a tested unit.