10-503140-032 Datasheet, PDF (238/437 Pages) Amphenol Corporation – The Interconnection Leader

Amphenol^® Circular Connectors for
Printed Circuit Board Applications
Amphenol
Aerospace
Amphenol provides circular connectors with PC Tail contacts. This catalog section features
the 38999 Series III, II, and 1 connectors which are ideal for printed circuit boards
applications, either with rigid attachment or with flex print assembly attachment. For
information on other amphenol circular connector with PC Tail contacts consult Amphenol,
Sidney NY.
MIL-DTL-38999 CONNECTORS, METAL & COMPOSITE
• Lightweight, compact, high density and high reliability cylindrical
• Operating voltage to 900 VAC (RMS) at sea level
• Environmentally resistant
• Solder or crimp rear release contacts in mating plug
• Series I (LJT) - Bayonet coupling
• Scoop-proof (recessed pins) offers maximum contact protection
• Series II (JT) - Bayonet coupling
• For applications requiring maximum weight/space savings and reliability
• Series III (Tri-Start) - Threaded, quick coupling in one
complete turn
• Designed for general duty as well as severe
environmental applications
• Superior EMI shielding with grounding fingers and
metal-to-metal mating
• Filter/Transient protection versions available
• Scoop-proof contact protection
• Stainless steel firewall versions, and composite versions
• Available in Hermetics
See MIL-DTL-38999 Series I, II, and III sections of this catalog
for more detailed information.
Note: MIL-DTL-38999 supersedes MIL-C-38999.
Special 38999 Connector with
Stand-off Shell and
PC Tails
How to Measure the PCB Tail Length
The tail length of the PCB is the portion of the contact that extends beyond the rear of the
shell. This length will vary in relationship to the mounting flange, depending on the series
of connector selected. Standard lengths are shown on the connector shell style drawings
in this catalog. These shell style drawing pages also provide how to order part numbering
for standard PCB cylin­drical connectors. When computing the desired tail length, it is
important to take into consideration the following factors:
• The connector series and shell style.
• The mounting style of the receptacle; jam nut (D hole) or panel mount (four holes).
This can affect the overall length of the tail.
• The extension of the tail beyond the opposite side of the board or the flex.
• The space required to adequately clean flux from between the board or flex and the
rear of the connector shell. Connectors that are mounted flush against the board may
trap soldering flux which could lead to corrosion of the solder joints.
Would Alignment Discs, Headers or
Special Stand-off Shells be Beneficial?
The answer is yes, any mechanical methods needed to stabilize the board or flex to the
connector and/or the panel is beneficial. The PCB tails shown in this catalog are of one
diameter. Stepped tails or PCB tails with an increased diameter on a designated portion
may be required for certain applications.
38999 Series III Box Mount
Connector with PC Tails
38999 Series III Connector with a
Special Configuration Composite
Shell and PC Tails
Stand-off Adapter on a
Jam Nut Receptacle.
Alignment discs are available which provide ease of alignment of pins to boards,
protection during shipment and optimized electrical circuit separa­tion. Header
assemblies (see pages 106 & 107) are available which provide time and cost saving
potentials. Standoffs may be required for certain applications. Amphenol has developed
a new stand-off adapter (see page 276) which may elimi­nate the need for special
stand-off shell designs. Connectors with clinch nuts can be provided. Please call
Amphenol to discuss any optional designs or any special requirements.
Universal Header Assemblies are avail-
able for Flex Print/PC Board Mounting.
Beneficial espe­cially when electrical
testing of the connector requires it to
be removed and reattached.
Contact Amphenol Aerospace for more information at 800-678-0141 • www.amphenol-aerospace.com 237