10-503140-032 Datasheet, PDF (46/437 Pages) Amphenol Corporation – The Interconnection Leader

MIL-DTL-38999, Series I LJT
MIL-DTL-38999, Series II JT
Features & Benefits
Amphenol
Aerospace
Components
Shell components are impact extruded or machined
bar stock aluminum. Standard plating on shell com­
ponents is cadmium over nickel. Many finishes are
optional (see “Specifications” page 16). Hermetic seal
receptacles are available in carbon steel or stainless
steel shells. Dependable 5 key/keyway polarization
with bayonet lock coupling is incorpo­rated to aid and
assure positive mating.
Insert material is a rigid dielectric with excellent elec-
trical characteristics, providing durable protec­tion for
molded-in solder type contacts. Contrasting letter or
number designations are used on insert faces.
Amphenol^® LJT and JT Series subminiature cylindrical
connectors are qualified to MIL-DTL-38999*, Series I and II
respectively. These con­nectors were developed to meet the
needs of the aerospace industry, and provided the impetus
for development of the MIL-C-38999 specifications, which has
been superseded by MIL-DTL-38999. Meeting or exceeding
MIL-DTL-38999 requirements, Amphenol^® JT/LJT connectors
feature:
• Lightweight, Space Saving Design
• Contact Protection - 100% scoop-proof LJT design prevents
bent pins and short circuits dur­ing mating
• Quick Positive Coupling - 3 point bayonet lock system
• Mismating Eliminated - with 5 key/keyway design
• Error Proof Alternate Positioning - insured by different key/
keyway locations
• EMI Shielding - grounding fingers standard in LJT Series;
optional in JT Series
• Nine Shell Sizes and a Variety of Shell Styles
• Contact Options - size 8, 10, 12, 16, 20, 22M and 22D
Crimp, Solder, PCB, Wire wrap, Coax, Twinax, Triax,
Thermocouple, Fiber Optic and Fil­ter
• Fixed Solder Contacts - Amphenol MIL-DTL-38999
Series I LJT and II JT, are available in solder versions as both
Commercial and Military qualified to MIL-DTL-27599
• Hermetic - air leakage limited to 1 X 10^-7 cm³ per
second optional
• “Breakaway” Lanyard Release Style - available in LJT
plugs. Provides quick disconnect of the connector plug and
receptacle with axial pull on the lanyard. See pages 78-80.
• Inventory Support Commonality - uses stand­ ard
MIL-DTL-38999 contacts, insert arrangements and
application tools.
• RoHS Compliant Product Available -
Consult Amphenol Aerospace Operations.
Where proof of high reliability and lot control is required, MS approved
equivalents to most proprie­ tary JT and LJT connectors are available.
* MIL-DTL-38999 Series I supersedes MIL-C-38999 Series I.
MIL-DTL-38999 Series II supersedes MIL-C-38999 Series II.
A fluorinated silicone interfacial seal wafer is fea­tured
on the mating face of “crimp type pin” inserts. This
assures complete electrical isolation of pins when
connector halves are mated. In addition, a main joint
gasket is installed in the receptacle for moisture seal-
ing between connector halves. Both features are also
available for hermetic receptacles.
Contacts
Maximum design flexibility is built into the JT/LJT
Series, with a minimum of 2 to a maximum of 128
circuits per connector in a wide variety of contact
arrangements. Contacts are available in sizes 8,
10, 12, 16, 20, 22, 22D and 22M with standard 50
micro inch minimum gold plating (100 micro inches
optional). All socket contacts are probe proof. Crimp
type rear removable contacts are featured in JT-R
and LJT-R connectors. Solder termination contacts
are also available, as well as PCB, wire wrap, ther-
mocouple, fiber optic, coaxial, triaxial and twinax
contact options.
Optional Features
High temperature capability of 392°F is available
only in JTS or LJTS crimp type connectors. High
temperature versions feature gold plated contacts,
high temperature shell plating, stainless steel
cou­pling nut spring, and epoxy inserts/fluorinated
sili­cone grommet combination. Standard temperature
capability for both solder and crimp is 302°F.
The JTN or LJTN type connectors are available
for N₂O₄resistance provided they are mated, and
un-grommeted rear faces are suitably protected.
For complete listing and definition of connector
types, shell styles and service classes, see How to
Order, page 46. For information on Fail-Safe Lanyard
Release style plugs, see pages 78–80.
Contact Amphenol Aerospace for more information at 800-678-0141 • www.amphenol-aerospace.com 45