MIL-DTL-38999, Series II JT
MIL-DTL-38999, Series I LJT
Amphenol
Features & Benefits
38999
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superseded by MIL-DTL-38999.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:
III
HD
Dualok
II
I
SJT
Accessories
Aquacon
Herm/Seal
PCB
MIL-DTL-38999
Series I LJT
•ꢀ Lightweight,ꢀSpaceꢀSavingꢀDesign
•ꢀ ContactꢀProtectionꢀ-ꢀ100% scoop-proof LJT design prevents
bent pins and short circuits during mating
•ꢀ QuickꢀPositiveꢀCoupling - 3 point bayonet lock system
•ꢀ MismatingꢀEliminatedꢀ- with 5 key/keyway design
HIgH
Components
SPEED
•ꢀ ErrorꢀProofꢀAlternateꢀPositioning - insured by different key/
Shell components are impact extruded or machined bar stock
aluminum. Standard plating on shell components is cadmium over
nickel. Many finishes are optional (see “Specifications” page 19).
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.
keyway locations
Fiber
Optics
•ꢀ EMIꢀShielding - grounding fingers standard in LJT Series;
optional in JT Series
•ꢀ NineꢀShellꢀSizesꢀandꢀaꢀVarietyꢀofꢀShellꢀStyles
•ꢀ ContactꢀOptions - size 8, 10, 12, 16, 20, 22M and 22D Crimp,
Solder, PCB, Wire wrap, Coax, Twinax, Triax, Thermocouple,
Fiber Optic and Filter
Contacts
Connectors
Cables
Insert material is a rigid dielectric with excellent electrical character-
istics, providing durable protection for molded-in solder type contacts.
Contrasting letter or number designations are used on insert faces.
•ꢀ FixedꢀSolderꢀContacts - 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
•ꢀ Hermeticꢀ- air leakage limited to 1 X 10-7 cm3 per second
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 sealing between
connector halves. Both features are also available for hermetic
receptacles.
optional
•ꢀ “Breakaway”ꢀLanyardꢀReleaseꢀStyleꢀ- available in LJT plugs.
Provides quick disconnect of the connector plug and receptacle
with axial pull on the lanyard. See pages 94-96.
•ꢀ InventoryꢀSupportꢀCommonality - uses standard
MIL-DTL-38999 contacts, insert arrangements and
application tools.
Contacts
•
RoHS Compliant Product Available -
Consult Amphenol Aerospace Operations.
Maximum design flexibility is built into the JT/LJT Series, with a mini-
mum 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, thermocouple, 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 N O resistance
provided they are mated, and un-grommeted rear fac2es4are
suitably protected.
For complete listing and definition of connector types, shell styles and
service classes, see How to Order, pages 62 & 63. For information on
Fail-Safe Lanyard Release style plugs, see pages 94–96.
Where proof of high reliability and lot control is required, MS approved
equivalents to most proprietary JT and LJT connectors are available.
MIL-DTL-38999
Series II JT
* MIL-DTL-38999 Series I supersedes MIL-C-38999 Series I.
MIL-DTL-38999 Series II supersedes MIL-C-38999 Series II.
Contact Amphenol Aerospace for more information at 800-678-0141 • www.amphenol-aerospace.com
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