Application Note 16 - Aids to IC Insertion
- While Stabilant 22 (/22A/22E) is known primarily for its property of providing the reliability of a soldered joint without forming a physical bond, it is becoming increasingly used in a dual role: not only for the reliability increase, but as an insertion aid for both machine and hand-insertion of DIP-package IC's!
- How does it assist in the insertion of IC's?
- Quite often, when an IC is inserted in a socket, one or more of the pins will buckle and bend-under. Sometimes this is not detected until
the system is powered-up, and it shows a fault. In some cases, it might not be detected until some program does not run properly! Because
of the large number of IC's used in many computers, the job of locating a single bent-under pin is often very difficult. And when a number
of boards are being hand-stuffed with "socketed" IC's, there is an excellent chance that this problem will occur.
When Stabilant 22 is used on the IC pins, its lubricating qualities reduce the insertion forces on the individual pins, making it much less likely that any pin will be bent-under.
- How can Stabilant 22 be applied to IC pins?
- An applicator can be made by using a rectangle of the conductive foam used to transport static-sensitive IC's. Using five-minute epoxy,
glue this material on the bottom of a container,-such as a petri-dish or a shallow tin. Stabilant 22 (as the concentrate) is then
poured over the foam pad.
To use it, the IC is picked out of the dispenser with a standard tool, and its pins thrust into the pad in order to wet them with the Stabilant. (While a small amount will b left on the bottom of the IC this will not affect its performance.) The IC is then inserted into its socket in the usual fashion. It will be noticed that there is less insertion resistance.
The use of Stabilant 22 is not a substitute for having the pins of the IC properly lined up or aligned in properly spaced parallel rows.
While hand insertion of IC's without the use of a tool is made much easier when Stabilant 22 is used as a lubricant, we suggest that a tool be used wherever possible.
- Can Stabilant 22 be diluted?
- The lubricating quality will, of course, be reduced as the Stabilant is diluted. If it is necessary to dilute it, we would suggest that a small amount of isopropyl alcohol be used - no more than 1 part of isopropyl alcohol to 3 parts of Stabilant 22 by volume.
- Can Stabilant 22A be used in this application?
- Yes, but as Stabilant 22A is diluted 4:1 with isopropyl alcohol, much more will have to be applied to the pins and its lubricating qualities will be realized only after the alcohol evaporates. This could slow down the process of IC insertion.
Stabilants™ are a product of Dayton Wright research & development and are made in Canada
NATO Supply Code 38948
15 ml of S22A has NATO Part # 5999-21-900-6937