February, 2019
www.us-tech.com
Page 77 Advantages of Micro and Nano Pins and Sockets Continued from page 75
SPEC is significantly less than the strength required to open the seam of a stamped contact, which has been proven by the use of tens of millions of these exact socket contacts in the field.
Flat Contact Leads It is well-established that a flat
The Magic of a One Millimeter Probe
Continued from page 73
uration. Testing revealed that the probe reached frequencies of 50.1 GHz at –1 dB insertion loss and 74.1 GHz at –3 dB insertion loss.
Mechanical Properties T033 testing looked at the
has an impedance of 62.8Wand a –1 dB value of 31.5. This is a significant improvement. This probe offers good thermal performance up to +275°F (135°C), from its stainless steel spring. The last remaining challenge is
mechanical properties cycling out to 150,000 cycles. There were no contacts with resistance above 100 mW after testing. Testing then turned to electri- cal properties with results at 50.1 GHz signals and impedance of 54.9W. A normal-sized probe at this pitch
to be able to use this very small probe in a plastic housing. Looking at the probe, it has a stub end and a regular probe tip shape at its opposite end. The probe tip shape can be retained by shoulders at the bottom of the tip, which is the usual way of handling such a probe. The company was challenged to
come up with a plastic shape that would allow the stub end to be held in place and still make contact with the PCB. Since the height of the probe is only 0.04 in. (1 mm), it required very thin plates. The prob- lem was solved by intersecting a cylinder with a slot in the bottom plate of the plastic housing. By doing this, the stub end of the probe could drop into the slot that came up from the bottom side of the plate, allowing it to reach the board. The probe is retained from
falling out of the plate by catching the bottom of the spring on the bot- tom of the cylinder. The slot is at a 45° angle to improve its electrical properties. Several of these bodies were machined to work out the right sizes and tolerances necessary for the cylinder-slot combination. Once the design validation of
the new probe was completed, the company began production. The T033 stamped spring probe has all the mechanical properties of a stan- dard probe of this pitch, while improving the electrical properties and bringing them close to what is expected of elastomeric contacts. Contact: Plastronics, 2601 Texas
Drive, Irving, TX 75062 % 972-258-2580 fax: 972-258-6771 E-mail:
sales@plastronics.com Web:
www.plastronics.com r
contact, particularly in these micro and nano sizes are more easily and predictably formed into specific shapes for consistent processing dur- ing assembly. Lack of coplanarity using
round contacts is a problem that flat, integral contact tails eliminate. This is particularly true with surface mount tail terminations in automated pick-and-place methods. A flat conductor will also
deliver more consistent cur- rent at the same temperature rise than a round lead. Stamped and formed micro and nano signal contacts with flat leads
Ulti-Mate Connector socket contacts prior to assembly.
have been continuously improved upon to provide more predictable processing and coplanar stability. They have proved to reliably deliver
3A and 1A respectively. The use of flat, edge-of-stock
material, instead of round, has resulted in im proved contact manu- facturing consistency and im - proved mechanical strength of the compliant pin and socket designs. They also provide a stable current carrying capaci- ty for micro and nano connec- tors that are one-fourth to one- eighth the size of a traditional connector. Contact: Ulti-Mate
Connector, Inc., 1872 N. Case Street, Orange, CA 92865
% 714-460-9855 fax: 714-637-7464 Web:
www.ultimateconnector.com r
See at IPC APEX, Booth 1621
Visit us at APEX in San Diego booth # 1621/ Jan 29 - 31, 2019!
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