Page 145 - Amphenol_Circular_12_C

Amphenol Amphenol Circular Connectors for
®
Aerospace Printed Circuit Board Applications

38999 Amphenol provides circular connectors with PC Tail contacts. This catalog section features
the 38999 Series III, II, and I connectors which are ideal for printed circuit board applications,
III either with rigid attachment or with flex print assembly attachment. For information on other
HD Amphenol circular connectors with PC Tail contacts, consult Amphenol, Sidney NY.
Dualok MIL-DTL-38999 CONNECTORS, METAL & COMPOSITE
II • Lightweight, compact, high density and high reliability cylindrical
I • Operating voltage to 900 VAC (RMS) at sea level
SJT • Environmentally resistant
Accessories • Solder or crimp rear release contacts in mating plug
• Series I (LJT) - Bayonet coupling
Aquacon
• Scoop-proof (recessed pins) offers maximum contact protection
Herm/Seal • Series II (JT) - Bayonet coupling
PCB • For applications requiring maximum weight/space savings and reliability 38999 Series III Box Mount
• Series III (Tri-Start) - Threaded, quick coupling in one Connector with PC Tails
HigH complete turn
Speed • Designed for general duty as well as severe
environmental applications
Fiber • Superior EMI shielding with grounding fingers and
Optics
metal-to-metal mating
Contacts • Filter/Transient protection versions available
Connectors • Scoop-proof contact protection
Cables • Stainless steel firewall versions, and composite versions
• Available in Hermetics
eMi Filter Transient See MIL-DTL-38999 Series I, II, and III sections of this catalog Special 38999 Connector with
Stand-off Shell and
for more detailed information.
PC Tails
Note: MIL-DTL-38999 supersedes MIL-C-38999.
38999 Series III Connector with a
26482 Matrix 2 How to Measure the PCB Tail Length Special Configuration Composite
Shell and PC Tails
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
83723 iii Matrix|pyle in this catalog. These shell style drawing pages also provide how to order part numbering
for standard PCB cylin drical connectors. When computing the desired tail length, it is
important to take into consideration the following factors:
• The connector series and shell style.
26500 pyle • 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
5015 Crimp Rear Release Matrix trap soldering flux which could lead to corrosion of the solder joints.

Stand-off Adapter on a
Jam Nut Receptacle.
Would Alignment Discs, Headers or
22992 Class L 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
Back- Shells may be required for certain applications.

Alignment discs are available which provide ease of alignment of pins to boards,
protection during shipment and optimized electrical circuit separa tion. Header
Options Others assemblies (see pages 120 & 121) are available which provide time and cost saving Universal Header Assemblies are
potentials. Standoffs may be required for certain applications. Amphenol has developed
a new stand-off adapter (see page 185) which may elimi nate the need for special available for Flex Print/PC Board
stand-off shell designs. Connectors with clinch nuts can be provided. Please call Mounting. Beneficial espe cially
Amphenol to discuss any optional designs or any special requirements. when electrical testing of the
connector requires it to be
removed and reattached.
144 Contact Amphenol Aerospace for more information at 800-678-0141 • www.amphenol-aerospace.com