Our age-old practice has been to put stoppers or pins in partially
filled 
tubes of DIP's to keep parts from sliding.  Ostensible reason was to
prevent tribocharging from parts sliding back and forth.

Now I'm wondering about the basis for this.  I can't find anything in 
ESD S20.20 or the handbook, likewise MIL-STD-1686C or MIL-HDBK-263.

Where does this practice come from, and does it still make sense?  JEDEC
maybe?  I haven't tried, but I expect it's kind of difficult to measure
the charge on 
such small parts, especially inside a static shielding tube.

FYI, we still use a lot of ceramic DIP's, along with some plastic, and
small
lots of surface mount parts may also come in this way.

Joe Kane
BAE SYSTEMS
Johnson City, NY

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