In the first entry, we introduced Seeed’s SMT Assembly line, and we took a look at the paste applicator, pick and place machine and reflow oven. You may think that’s all there is to PCBA but there is more. We will cover through-hole assembly and testing options here.
Through-Hole Component AssemblyTo solder large volumes of through-hole components, assemblers traditionally used wave soldering machines that run the boards across a molten bath of solder. But this method may not be suitable for double-sided mixed assembly boards, and continuously maintaining the molten bath is both economically and environmentally inefficient. So, to solder the many connectors and pins that typically go into development boards, Seeed has opted for a selective soldering method.
Inspection and Re-workingAfter all soldering is completed, each board is cleaned and again carefully inspected for soldering defects such as tombstoning or misalignment from the reflow oven. Any errors are identified, and the boards are sent to the re-working station to be corrected manually.
TestingAfter visual inspections are completed, other more in-depth tests are carried out if required. Seeed can arrange various tests including functional tests to ensure your device operates as expected, mechanical tests such as temperature and humidity tests, In-Circuit-Tests (ICT), AOI and X-ray inspections for example. Seeed Studios’ assembly site. In the next article, we will cover how to prepare the BOM file to retrieve a quote from the online platform and give you some component sourcing tips. Seeed Fusion PCBA can carry out assembly on any type of board with any surface finish; rigid FR-4, aluminium, flexible, Rogers, 4 layer, 8 layer, ENIG, OSP, etc. and can perform SMT, through-hole and mixed assembly from components as small as 01005 (0204) package size or 0.38mm pitch. Our facilities are entirely lead-free and IPC-A-610F compliant. Pricing starts from $25 set-up fee and $0.01 to $0.30 assembly fee per component. Seeed Fusion offers various component sourcing options to suit your needs from reliable partners such as DigiKey, Mouser and Element14, to in-house stock from our Open Parts Library (OPL). You may also like: SEEED FUSION PCBA SERIES 1: WHAT IS PCB ASSEMBLY? SEEED FUSION PCBA SERIES 3: HOW TO GET PCB ASSEMBLY QUOTES IN SECONDS SEEED FUSION PCBA SERIES 4: PCB ASSEMBLY PRICING EXPLAINED SEEED FUSION MARCH SALES: THE BIGGEST AND MOST GENEROUS State of Electronics: Factory Tours of Shenzhen – Seeed Studios – YouTube
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