Sourcing components is often problematic when it comes to PCB assembly. Coordinating lead times, component overages, part substitution logistics, multiple component vendors and your PCB assembly house is a big drain of energy and resources.
In addition, many quality control factors come into play with consigned assembly kits.
Full & Partial Turnkey Assembly - Typical turnaround times:
|BOM Verification & Quoting||2 business days from submission|
|Component Sourcing||1-3 business days from order date (depending on availability)|
We offer both full turnkey PCBA and partial turnkey. Both options have similar concepts - they reduce your responsibility to source electronic components, including overage calculations, managing the BOM, logistics, inventory and more.
Full turnkey assembly includes the entire spectrum of services including:
Partial turnkey, on the other hand, allows customers to take control of one or more of the processes listed above. Typically, this would be sourcing and shipping some or all of the components (consignment or partial consignment).
The consignment assembly model is becoming less and less common due to the many benefits that come with full turnkey assembly.
In general, delegating all or part of the responsibility for component sourcing and assembly to us is beneficial for many reasons:
Typically, a full turnkey assembly will lead to a quicker delivery and more consistent end-products leading to a shorter time to market!
Components for surface mount assembly should be on tape and reel. Cut tape may also be used but only if there is sufficient tape to mount into the feeders.
Quantities & Overages
By far the most important factor for consigned PCB assembly is component quantities.
It is critical to provide the correct quantities, including overages, and ensure the count is correct when the components are shipped out (we cannot logistically count every single component).
Please refer to our component overages cheat sheet below for the quantity of spares needed on the tape to account for attrition:
|Component Size||Need less than 20 pieces||Need less than 50 pieces||Need less than 100 pieces|
|01005||Order 150 or more||Order 200 or more||Order 250 or more|
|0201||Order 100 or more||Order 150 or more||Order 200-250 or more|
|0402||Order 100 or more||Order 150 or more||Order 200-250 or more|
|0603||Order 100 or more||Order 150 or more||Order 200-250 or more|
|0805||Order 50 or more||Order 100 or more||Order 150 or more|
|1206||Order 50 or more||Order 100 or more||Order 150 or more|
The quantities required above would be for each set up of the feeder and remaining parts will be lost during the removal and reinstallation. So, if the assembly job is being set up more than one time or on future runs, additional components will be required.
View more details on our PCB component overages "cheat sheet" page.
Proper Identification in BOM & Kit
When submitting a consignment kit, it is important that the part numbers match the BOM, including any alternate part numbers.
Advanced Packages / BTCs (Bottom Terminated Components)
BGAs, QFNs and other similar components should be verified to the PCB footprint. Footprint errors that are found at placement cause difficulties as they would require a special reflow process (often with custom tooling) after initial population and reflow soldering and cannot be hand soldered.
Inspection of Consigned Bare Boards
If the bare circuit boards will also be consigned, a full inspection of the boards should have been done beforehand. While we will conduct a basic quality inspection of the circuit boards, a full inspection of items like fabrication notes, hole sizes, certifications and dimensions should be conducted by the customer.