Category:PCB Assembly PCB Assembly Service

Group Administrators: 1 | Group Member: 251 | Group Threads: 383

In assembly the bare board is populated with electronic components, called a "printed circuit board assembly" (PCBA). In through-hole technology, the component leads are inserted in holes surrounded by conductive pads; In surface-mount technology (SMT), the component is placed on the PCB so that the pins line up with the conductive pads or lands on the surfaces of the PCB.

Thread Reply
To populate a surface mount PCB Reply 2017-02-26 18:49:27
366 views
1 comments
23 likes

miika.kirves

Leave A Message

Follow

Let’s face it friends, everything is moving toward surface mount components. We’ve seen quite a few features here that cover using stencils to populate boards and using ovens to reflow. Jack has put together a tutorial on the process he uses to populate and reflow his own boards.

Jack is the creator of the USB Isolator and therefore has a need to frequently populate the same board. He’s using an acrylic frame that fits the PCB perfectly to hold it in place so that paste and be applied right up to the edges of the board. He ordered a laser cut Kapton stencil for applying the solder. The paste is squeegeed into the stencil holes, the stencil is removed, and parts are placed with tweezers and a steady hand. For the final step, the boards go into an old toaster oven for reflow.


Jack uses temperature marker on his boards to monitor the progress of the reflow. This marker is basically a crayon that begins to melt at a specific temperature. When the board has cooled, the melted mark can be scraped away or removed with alcohol.
Of course this is only really useful if you have a bunch of high-quality boards to populate. But with the relatively low cost of getting professionally made boards we think the need for this type of assembly process is on the rise.

23 likes
Statement: This post is only the personal view of the author and does not represent the opinions of ALLPCB.com.

Antonio Semeraro

Leave A Message

Follow

I will keep on reading your sharing. Thats really interesting and helpful.
ThreadReply