Indium Corporation has two options available for connector pin soldering: standard individual washers and InTEGRATED™ Preforms.
If you are using individual washers in your process, there are several things to keep in mind:
- The ID (inner diameter) of the washer will be the most critical dimension. It needs to fit over the pin. If your washers are flux-coated, be sure to allow for the added flux in your calculation.
- Some IDs are too small for flux coating as the flux coating can easily obscure the ID and make it difficult to smoothly place a washer over a pin.
- When you are flux coating your washers, less is more. In other words, 0.5% to 1.5% flux by weight is sufficient to reduce the surface oxides and prepare the surface for wetting.
- Solder volume can be adjusted by adjusting the thickness. Contact us to help determine the best inner and outer dimensions for your application. Next we'll need to know the board thickness, hole size, and pin size. Then we can recommend the proper thickness for your washer.
- Here are some common washer sizes:
- 0.020" x 0.031"
- 0.022" x 0.050"
- 0.025" x 0.040"
- 0.027" x 0.043"
- 0.030" x 0.049"
- 0.032" x 0.052"
- 0.033" x 0.060"
- 0.035" x 0.060"
- 0.043" x 0.058"
- 0.045" x 0.060"
- 0.045" x 0.080"
- 0.060" x 0.100"
- Washers are available in a variety of alloys, including indium-based alloys which allow for soldering to ceramics or other non-metallics.
Pin soldering to ensure a reliable solder joint on each pin can be challenging. Spacing, quantity, size, and location of the pins on a board, as well as the board thickness can make it difficult to get individual washers over the pins.
Manual placement includes hand-placing individual washers over each pin. This is viable for larger washers and simple pin design. However, as the pins get smaller, more complex, or larger in number, manual placement becomes more problematic.
The solution? InTEGRATED™ Preforms.
InTEGRATED™ Preforms are linked washers that can be cut to the configuration of the connector and placed in one simple motion, saving time and money.
Saves time - no need to place each washer individually.
Saves money - by eliminating the need for special pick and place equipment or extra fixtures.
InTEGRATED™ Preforms are washers (or other shapes) that are linked together to allow for placement of multiple washers in one single motion. In virtually the same time it takes to place ten washers on one connector, by hand, one at a time, up to ten connectors can be ready for reflow.
InTEGRATED™ Preforms washers are joined in a matrix by fine, precise strands of solder. These strands melt and flow to the adjacent pads during the reflow process, providing for a complete separation of the washer preforms.
InTEGRATED™ Preforms require an even heating process - vapor phase and convection reflow are ideal. If the job is small enough a hot air gun will work, provided you apply the heat evenly.
InTEGRATED™ Preforms are sold in single, patterned sheets. The pattern for each connector will be cut from the sheet. To determine the pattern, we need to know:
- Hole size
- Pin size
- Board thickness
- Pitch of the pins (between the row and row-to-row)
InTEGRATED™ Preforms are best suited for smaller volume applications that are not easily automated.
Tips for using InTEGRATED™ Preforms:
- Flux must be applied separately to both sides
- Preforms must be flat in the application
- Uniform reflow heat is required
- Minimum thickness is 0.002" and maximum thickness is 0.018", but they can be stacked to achieve greater solder volume
Not all alloys are suited for InTEGRATED™ Preforms. Contact us for technical advice about your application.
Connector Assembly Technical Documents
Product Data Sheets
Safety Data Sheets
No safety data sheets to display
Indium Corporation Blog Posts
Phil Zarrow: Ron, in your book, “The Adventures of Patty and the Professor,” you have a productivity example. Can you tell us a little bit about it?
Ron Lasky: Yes. There was a young engineer who had attended one of my workshops and his boss had asked him to get ready to install another assembly line. They had two assembly lines. And this young engineer rightly thought, “Well, I don’t think our productivity is that high. If we improved our productivity, we might not have to buy another assembly line.” So he invited me there to measure their uptime and see if they really did need another assembly line.
Phil Zarrow: Ron, we’ve discussed that performance of materials can affect productivity, and hence profitability. Can you give us an example?
Ron Lasky: Yeah. I was working with a certain customer that had a problem with their solder paste that we call poor response-to-pause. As you’re aware, probably several times a day, the assembly line has to be shut down to replenish components. And in that pause time, some solder pastes can stiffen up. And then we turn the line back on and you make a stencil print, that first print is bad. And you have to wipe that board and reprint it again. You lose probably about two minutes, maybe every two hours.
Phil Zarrow: And how can this affect the bottom line?
Phil Zarrow: Ron, you’ve been interested in productivity for quite a while. Can you tell us how this interest started?
Ron Lasky: I’ve been interested in line balancing for quite a while. And so, when I would tour factories, as part of my job, I would usually go out and look at the component placement machines to see that they were taking the same amount of time. And, as you’re not surprised, I found it very seldom where the lines balanced, that was one thing. But often when I would go out to see this on the lines, the lines weren’t running, and it just caused me to be curious, you know, how often were lines running?
From One Engineer to Another®
All of Indium Corporation’s products and solutions are designed to be commercially available
unless specifically stated otherwise.