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Amphenol Circular Connectors for Guide to Selecting a PCB Circular Amphenol
Printed Circuit Board Applications Connector, Cont. Aerospace

What Determines the Diameter of the PCB Tail?
38999
The outside diameter of the PCB tail is determined by the inside diameter of the plated through-hole III
on the board or flex print. The standard or most popular diameters are shown in the chart on the next HD
page and are called out in the connector illustrations in this catalog.
Dualok
Standard diameters of PCB tails II
Connector Series Size 16 Contact Size 20 Contact Size 22D Contact I
For availability of other contact diameters, consult Amphenol, Sidney NY. .019 ±.001 SJT
MIL-DTL-38999
.019 ±.001
.062 ±.001
Should PCB Tails be Gold Plated or Pre-tinned? Compliant Pin Contacts in a Accessories
Bayonet 38999 Catalog
The standard PCB tails for MIL-DTL-38999 receptacles have gold plating,.00005 inches over nickel. Aquacon
Amphenol can substitute a pre-tinned version of these tails to facilitate the termination process. This Herm/Seal
pre-tinning is a 60/40 lead-tin alloy. Call Amphenol for further information on pre-tinning and any PCB
other plating of contacts not covered in this catalog.
Would Flex Assemblies be Necessary or Beneficial for the Application? HigH
Speed
Flex print can radically simplify the assembly of a connector to a system, as well as eliminate wiring Fiber
errors. Amphenol offers connector flex assemblies through APC, Amphenol Printed Circuit division. Optics
Features and bene fits of using flex technology include:
• Available for MIL-DTL-38999 (including filter EMI/EMP types) circular connectors Contacts
• Sculptures Flexible Circuits with built-in terminations Connectors
®
Cables
• Eliminates failures associated with crimped or solder-on contacts
• Geometrically fit tight space requirements and create a self-locking
terminal pad Transient eMi Filter

Should Other PC Tail Contact Types be Considered?
Press-Fit Connectors with compliant pins are available which engage the plated
through-holes in the board without the need for soldering. This optional contact style 26482
offers the following benefits: Matrix 2
• Improved board processing time
• Excellent temperature performance
• Ideal for low-lead applications Matrix|pyle 83723 iii
For more information on Press-Fit connectors with compliant pins see page 557.

Special Quadrax contacts have been designed with PC tails. Coax, twi nax and triax
contacts can also have PC tails. Refer to the High Speed contacts section of this catalog. pyle 26500

Special Design with
Longer PC Tails in a
38999 Composite Shell
Connector. Also shows Matrix Release Crimp Rear 5015
an Alignment Disc. Class L 22992

Quadrax PC Tail Contacts Quadrax Contacts with PC Shells Back-
Com bined with Standard PC Tails in a 38999 Connector Others Options
Tail Contacts with Special Stand-off
Shell

Flex Termination for Attachment to PC Boards
Contact Amphenol Aerospace for more information at 800-678-0141 • www.amphenol-aerospace.com 145