Every procurement manager knows the scenario: your design team finalizes a BOM, you send RFQs to a handful of component distributors, negotiate lead times, place purchase orders with three different suppliers, coordinate shipments to an assembly house, discover that one line item went end-of-life between quote and order, re-source it, delay assembly by two weeks, and field angry calls from the engineering VP. By the time assembled boards arrive, the project is six weeks late and nobody can tell you who was accountable for what.
ADD Components' turnkey PCBA service exists to make that scenario history. One purchase order. One point of contact. One shipment of assembled, tested boards. No finger-pointing — because there's only one finger to point.
What "Turnkey" Actually Means
In the PCBA world, "turnkey" means the service provider owns the entire supply chain from component procurement through final assembly. The customer provides two things: a BOM (bill of materials) and Gerber files. Everything else — sourcing, incoming inspection, assembly, testing, and shipping — happens under one roof (or one tightly managed partner network). Compare this to the consignment model, where the customer buys components themselves, stores them, kits them, and ships them to an assembler who only provides labor and equipment. The consignment approach fragments accountability: if a board fails, is it the component, the storage conditions, the assembly process, or the test procedure? Good luck getting a straight answer from three different vendors.
The ADD Turnkey Workflow
BOM intake and review: BOM is checked for completeness — manufacturer part numbers, package codes, reference designators, quantities. ADD's sourcing team immediately flags lifecycle risks (NRND, EOL, allocation) and proposes pin-compatible alternatives where lead times are unacceptable.
Global component procurement: With 3,000+ channel relationships across authorized and verified independent sources, ADD aggregates the BOM from the best available inventory. 48-hour cross-reference capability means even obscure or legacy parts get matched quickly.
Incoming QC: Every component batch passes visual inspection, date-code verification, and — for high-value or critical packages (BGA, QFN) — X-ray inspection before release to the assembly line.
Assembly at partner factory: SMT, through-hole, or mixed-technology assembly on production lines supporting 0201 to 55 mm BGA, 2–32 layer boards, and IPC-A-610 Class 2 or Class 3 standards.
Testing and shipment: AOI, X-ray, ICT, or functional testing per customer specification. Boards ship in ESD-safe packaging with full batch traceability documentation.
The Pain Points Turnkey Eliminates
Three problems surface repeatedly in consignment PCBA — and turnkey solves all three at once:
Component EOL during assembly prep. When an MPN goes end-of-life in the 4–6 weeks between BOM finalization and assembly start, consignment buyers scramble. Turnkey providers catch it during BOM review — before a single PO is placed — and propose alternatives immediately.
Minimum order quantity mismatches. Distributors quote reel quantities of 3,000 when your prototype run needs 50. You either buy the reel (wasting capital) or pay a painful broken-reel surcharge. ADD's consolidated purchasing model aggregates demand across customers, absorbing MOQ friction so you pay for what you need.
Quality traceability. Consignment assembly means components from three sources arrive at one factory. If a batch of boards fails, was it a counterfeit IC from Supplier A, moisture-damaged passives from Supplier B, or a cold solder joint from the assembly line? Turnkey provides a single traceability chain — every component in every assembled board is documented from supplier to solder joint.
Who Benefits Most
Turnkey PCBA delivers the strongest ROI for mid-sized OEMs running 500–50,000 boards annually, startups transitioning from prototype to production, and any team where procurement bandwidth is a bottleneck. If you're currently managing three or more supplier relationships per PCBA order, turnkey will almost certainly reduce your total landed cost — not by squeezing component pricing, but by eliminating the hidden costs of fragmentation.
Send your BOM and Gerber files to info@addcomponents.hk for a turnkey quotation. Typical response: within 24 hours.