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Understanding PCB Pass Through Interconnects

Mill-Max Series 834/835 Pass Through Sockets have a low .130" (3,3mm) profile and will accept .030" (0,76mm) diameter round pin, as well as industry standard .025" (0,64mm) square pin headers. Each receptacle has a current rating of 4.5 amps. Both single (series 834) and double row (series 835) insulators are high temperature thermoplastics and suitable for RoHS soldering profiles.

Organic Fibre Plug Steps

Unique Organic Fibre Plug® barriers prevent solder, paste or flux from contaminating the internal spring contacts. After soldering, the OFP® barriers are pushed out when the mating header is inserted. The open-bottom, through hole receptacle design makes it ideal for PCB-to-PCB stacking applications. In fact, the long, open bottom receptacle tail not only allows for conventional, top PCB mounting, but it can also be inverted and mounted below the PCB to create unique bottom-pin entry connectors.

A bottom-entry connector is perfect for module stacking applications where a male pin header located on the base PCB must pass through a piggy backed board above it. Note the Mill-Max Series 834/835 Pass Through Sockets are properly used to create electrical interconnects and not as mechanical standoffs or fasteners.

 

Features of Organic Fibre Plug® Pass Through Interconnects

  • Pass Through Diagram
    Pass Through Sockets have a low .130” (3,3mm) profile and will accept .030” (0,76mm) diameter round pin, as well as industry standard .025” (0,64mm) square pin headers.
  • Organic Fibre Plug® barriers prevent solder, paste or flux from contaminating the internal spring contacts.  After soldering, the OFP® barriers are pushed out when the mating header is inserted.
  • The open-bottom, through hole receptacle design makes it ideal for PCB-to-PCB stacking applications. The long, open bottom receptacle tail not only allows for conventional top PCB mounting, but it can also be inverted & mounted below the PCB to create unique bottom-pin entry connectors.

Single Row Bottom Entry Application

An example of series 834 single row connectors being used as a bottom entry pass through connector for stacking two boards.

10 Position Single Row Connector
A 10 position, single row, 834-43-010-10-001000 applied as a PCB bottom entry connector.
5 Position Connector
A 5 position, single row, applied as a PCB bottom entry connector in a board stacking requirement

Double Row Bottom Entry Application

An example of series 835 double row connectors being used as a bottom entry pass through connector for stacking two boards

Double Row 16 Position Connector
Double-row, 16 position, 835 series connector intrusive reflow soldered onto the bottom side of a .125” (3,18mm) thick PCB
16 Position Double Row Connector
A 16 position, double row, connector about to be applied as a PCB bottom entry connector in a board stacking requirement

3 Board Stacking Application

Shown here is a three PCB module application using two Mill-Max 16 position, double row, 835-43-016-10-001000 connectors, stacked upon a long male pin header mounted on the base PCB.

Header and Socket Connector
16 position male pin header engaged and passing through a 16 position, double row, PCB bottom entry connector
Pass through Disengaged
Top PCB disengaged from this 3-board module application.

Shown here is a three PCB module application using two Mill-Max 5 position, single row, 834-43-005-10-001000 connectors, stacked upon a long male pin header mounted on the base PCB.

Engaged Pass Through Connectors
The first connector provides clearance to the large red can device and provides a pass-through connection
Disengaged Pass Through Connectors
Top PCB disengaged from this 3-board module application.

 

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