49
Tri-Start – specials
coax, twinax and triax contacts,
ground plane connectors, press fit connectors
Amphenol MIL-DTL-38999 Series III connectors are the most
commonly used connectors for incorporation of shielded contacts
along with traditional crimp contacts and also with contacts for data
bus, LAN and coax/triax/twinax transmission lines with conductive
inserts that ground the outer conductor of the coax, triax, twinax
contact to the shell. These connectors are sold “less contacts”. They
will accommodate size 8 coax, triax or twinax contacts or size 12 and
16 coax contacts.
The insert availability chart on pages 6 and 7 indicates the patterns
that are available in a ground plane version, (see those designated
with a star symbol), and consult how to order pages for ordering
procedures.
CONNECTORS WITH SHIELDED COAX CONTACTS
For shielded wire applications, coaxial contacts can be incorporated
into MIL-DTL-38999 connectors. Designed-in crimp or solder types
are available to fit various RG and special cables. High performance
coaxial contacts eliminate discontinuities or
impedance variations due to movement of
parts under axial load.
Concentric Twinax Contacts
Qualified to M39029/90 and /91
CONNECTORS WITH CONCENTRIC
TWINAX CONTACTS
The size 8 concentric twinax contact was
developed for use in MIL-STD-1553 Airborne
multiplex data bus applications which require
high performance interconnect characteristics
in multi-pin connectors. Ideal for this applica-
tion need is the high performance Tri-Start
connector with its fully scoop-proof feature of
recessed pins. The concentric twinax contact is
crimp terminable to twisted-shielded cable.
SHIELDED TRIAX CONTACTS
Triax contacts have three conductors and are
offered in sizes 8, 10 and 12. They provide
additional shielding when terminated to triax
cable having solid or stranded center conduc-
tors. Each of the three conductors of the triax
contact is separated by dielectric insulation to
isolate ground planes and to improve shielding
effectiveness.
High speed data transmission quadrax
contacts are now available for use in MIL-DTL-
38999 connectors.
PRESS FIT CONNECTORS
Tri-Start connectors are also designed for the
application of solderless mounting to printed
circuit boards. The Press Fit connector perfor-
mances are compatible with Series III
Ground Plane Connector with Twinax
Contacts and Insulated Power/Signal
Contacts
MIL-DTL-38999 Series III
Connectors with Compliant Pin
Contacts for Solderless Mount-
ing on Printed Circuit Boards
Consult the following Amphenol literature for further
information:
Product Data Sheet 139 for Ground Plane Connectors.
Product Data Sheet 188 for Press Fit Connectors.
Catalog 12-130 for High Frequency Contacts for Multi-
pin Connectors.
38999 Series III Connector
with Twinax Contacts and
Standard Contacts
Shielded Coax Contacts
