10-503140-032 Datasheet, PDF (239/437 Pages) Amphenol Corporation – The Interconnection Leader

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Guide to Selecting a PCB Circular
Connector, Cont.
What Determines the Diameter of the PCB Tail?
The outside diameter of the PCB tail is determined by the inside diameter of the plated through-hole
on the board or flex print. The standard or most popular diameters are shown in the chart on the next
page and are called out in the connector illustrations in this catalog.
Standard diameters of PCB tails
Connector Series
Size 16 Contact
Size 20 Contact
For aMvaILil-aDbTilLit-y3o8f9o99ther contact d.0ia6m2e±t.e0r0s1, consult Amphen.0o1l,9S±i.d0n0e1y NY.
Size 22D Contact
.019 ±.001
Should PCB Tails be Gold Plated or Pre-tinned?
The standard PCB tails for MIL-DTL-38999 receptacles have gold plating,.00005 inches over nickel.
Amphenol can substitute a pre-tinned version of these tails to facilitate the termination process. This
pre-tinning is a 60/40 lead-tin alloy. Call Amphenol for further information on pre-tinning and any
other plating of contacts not covered in this catalog.
Compliant Pin Contacts in a
Bayonet 38999 Catalog
Would Flex Assemblies be Necessary or Beneficial for the Application?
Flex print can radically simplify the assembly of a connector to a system, as well as eliminate wiring
errors. Amphenol offers connector flex assemblies through APC, Amphenol Printed Circuits division.
Features and bene­fits of using flex technology include:
• Available for MIL-DTL-38999 (including filter EMI/EMP types), circular connectors
• Sculptures^® Flexible Circuits with built-in terminations
• Eliminates failures associated with crimped or solder-on contacts
• Geometrically fit tight space requirements and create a self-locking
terminal pad
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
offers the following benefits:
• Improved board processing time
• Excellent temperature performance
• Ideal for low-lead applications
For more information on Press-Fit connectors with compliant pins see page 416.
Special Quadrax contacts have been designed with PC tails. Coax, twi­nax and triax
contacts can also have PC tails. Refer to the High Speed contacts section of this catalog.
Special Design with
Longer PC Tails in a
38999 Composite Shell
Connector. Also shows
an Alignment Disc.
Quadrax PC Tail Contacts
Com­bined with Standard PC
Tail Contacts
Quadrax Contacts with
PC Tails in a 38999
Connector with Special
Stand-off Shell
Flex Termination for Attachment to PC Boards
238 Contact Amphenol Aerospace for more information at 800-678-0141 • www.amphenol-aerospace.com