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HDM® Frequently Asked Questions
Electrical
What
is the current rating of the signal pins?
1 amp
What
is the current rating of the power blade?
15 amps/blade. 45 amps total.
Can
the guide pins be used for first-make ground?
A unique grounded guide module and mating guide pin are now
available.
What
is meant by the term 'real' signal pins?
The maximum number of pins usable for signal transmission
while providing less than 5% backward and forward crosstalk,
and less than 5% reflection at the desired risetime.
What
is the contact resistance between the compliant pin and the
plated-through hole?
1 milliohm, maximum.
What
is the maximum signal speed compatible with HDM?
The connector has tested well at 500 picoseconds with extra
ground positions, however it is designed to work in a one
nanosecond environment.
Mechanical
What
is the per pin insertion/mating force?
46 grams per signal pin.
What
is the normal force per contact beam?
50 grams per contact beam.
What
kind of compliant press-in forces should I expect with the
6-row connector in a 144 position module?
Pressing in a 144 position module requires 864 lbs force.
Please review our technical bulletin (TB2001) for proper set
up.
The daughtercard connector is press-fit.
Do I still need screws through my daughtercard?
Yes, for joiners and guide modules.
Will
there be a different drilled and finished hole specification
for the different surface finishes that we want to use?
No. The drill size is 0.033" and the finished hole size is
0.0255" to 0.0305" regardless of the surface finish.
How many
modules can I end stack in a connector pattern?
Total connector width should be held to 19 inches or less.
When
should I use the guide pin?
Our design rules call for one guide pin for patterns less
than 4 inches and two guide pins for those over 4 inches.
Has HDM
passed Bellcore testing?
Yes. HDM has been accepted under report #GR-1217-CORE (from
1998).
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