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Questions tagged [stencil]

The tag has no usage guidance.

3
votes
1answer
41 views

SMD Stencil Material Choice

We are planning to purchase a stencil for our LED boards. This will be my first stencil purchase so I don't have much idea about a good or bad one. The inquiries I received typically suggest two ...
0
votes
0answers
41 views

PCB design - paste coverage calculation for exposed pad (TL;DR version?)

I have created a Web tool for creating solder mask and paste mask for exposed pad: https://jsfiddle.net/d1wang/5t6urzwo/ The idea is get around limitation of DipTrace and help automate footprint ...
0
votes
2answers
92 views

Solder paste stencil

I am ordering the stencils and I do not know if I shuld order .12 o .1 ones. There are some TQFP64 ISs and 0603 passive elements. I'd like to avoid bridges. Thank you Peter
0
votes
1answer
75 views

Export pads as a pdf file in Altium

I'm not used to working on Altium Designer(17.1). I couldnt find how can I export only pad layouts to making a stencil schematic. It is good to export as a pdf file if it possible.
1
vote
1answer
247 views

Stencil Required for Through Hole Components

I was creating a pcb board that is mostly made of header pins that are suppose to connect to adapters. I was wondering if a stencil is required for soldering through hole components on a bare bone pcb....
13
votes
1answer
3k views

Why order a laser stencil?

Quick two part question on PCB manufacturing. I am looking to order a prototype PCB and all the manufactures I've gotten a quote from all offer to include a Laser stencil, some charge for the stencil ...
0
votes
1answer
135 views

Stencil for PCB etching?

I have been looking into homemade PCB etching, since ordering PCBs takes longer than I would like. I have seen PCB stencils for applying solder paste, and I am wondering if it is possible to use a ...
0
votes
0answers
923 views

Half-etched fiducials Vs through-cut fiducials

While making PCB, I added 8 fiducials (fids) marks so that pick and place machines use these marks as referent points on the PCB to position the surface mount components (Packages) during assembly. ...
3
votes
2answers
367 views

Good practice when designing a PCB and stencil?

While I generally use nothing smaller that SOIC chips or 0603 passive components, I have to design a PCB with a WSON-14 IC with tiny 0.5mm pin spacing and with an exposed pad. While I generally use a ...
0
votes
1answer
143 views

QFN32 exposed pad stencil

I made a pcb with a QFN32 with exposed pad but I feel like I've made a mistake on the stencil, in the exposed pad area. I managed to solder it and the chip (CC1310) is programmed successfully but I'm ...
0
votes
1answer
117 views

Solder paste for stencil

I'm going to solder a small pcb with reflow process and I'd like to use a stencil for that because the components are too tiny for hand soldering iron. The pcb has a QFN32 (0.5mm pitch and exposed pad)...
4
votes
2answers
603 views

Applying solder paste through stencil and with a machine dispenser

I am trying to apply soldering paste to a PCB using stencil but I am having issues with S-PQFP-G80 package with 0.5mm pitch. Whenever I try to apply the paste through the stencil I end up with paste ...
3
votes
1answer
2k views

How to Clean Solder Stencils?

I have had great success in the past using the reflow soldering method, using a syringe and needle to apply the paste to the board. However, I found myself repeatedly making the same boards so I ...
7
votes
1answer
862 views

Solder paste stencil application

I am trying to do reflow soldering with a stencil for the first time. I have done some reflow soldering before, but every time I manually applied the paste using a small syringe + needle. These ...
1
vote
1answer
370 views

Removing stencil mask from chip for BGA reballing

I am in the process of reballing my ps3 system. This is my very first time so i am watching tutorials online. My question is how do i remove the stencil mask from the chip without moving the balls? ...
4
votes
3answers
1k views

What's a good plastic for self-cutting solder paste stencils on a laser?

I've tried making my own solder paste stencil using 4 mil polyester (for overhead projection slides) on a 45W Epilog laser cutter at the local TechShop maker space. I could not "cut" the stencil ...
4
votes
1answer
553 views

How to apply solder paste with stencil in a 2 sided PCB?

I have seen lots of tutorials about how to apply solder paste using a stencil, but all of them only show how to apply the stencil to one side of the PCB. My current project is 2 sided and I would like ...
3
votes
1answer
784 views

Is there a pitch limit to applying solder paste through a PCB stencil by hand?

I've ordered two stencils from two different companies, two different materials. Both times I've been completely unable to effectively apply solder paste to the pads of a QFP-64. I end up with a mess ...
0
votes
1answer
191 views

What effect do different SMT stencil materials have on results?

I have a PCB with 20-mil pitch SMT pads for a QFP-64. I ordered a stencil for it, which is made of some flexible material. I haven't had much luck with it, I suspect because the material is so finicky....