# RE: PCB to external connection

#### Dinesh_rd7

Joined Jan 26, 2020
43
Hi,
I need to connect 5 wire from pcb to outer terminal,
whether soldering the wire is a better method, or is there any other method for connecting the wire with pcb. it should withstand even in hard environmental conditions.
Thanks,
D

#### jpanhalt

Joined Jan 18, 2008
10,981
I have used, but do not like soldered wires on the PCB to a detached connector. My favorite method a pinheader (guarded or unguarded) on the PCB to socket on cable (or reversed geometry) or an FPC connector on the PCB and FPC cable. You an also use finger contacts on the PCB and an appropriate connector.

#### KeithWalker

Joined Jul 10, 2017
1,409
The best method of connecting them will depend on what kind of electrical signal or supply the wires are carrying. Can you give a little more information? what does the PCB do? What is the terminal? Are the wires carrying digital, audio or RF signals? What current are the wires carrying? Without this information, we can not recommend the best way to make the connection.
Regards,
Keith

#### dl324

Joined Mar 30, 2015
12,265
it should withstand even in hard environmental conditions.
Soldered connections will be the most reliable, but they do have connectors with a latching mechanism.

#### Dinesh_rd7

Joined Jan 26, 2020
43
The best method of connecting them will depend on what kind of electrical signal or supply the wires are carrying. Can you give a little more information? what does the PCB do? What is the terminal? Are the wires carrying digital, audio or RF signals? What current are the wires carrying? Without this information, we can not recommend the best way to make the connection.
Regards,
Keith
The wire carry just the voltage upto 10V, my pcb board function is just measuring the speed of a wheel using a sensor.

#### Dinesh_rd7

Joined Jan 26, 2020
43
The wire carry just the voltage upto 10V, my pcb board function is just measuring the speed of a wheel using a sensor.
the current will be upto some 50 mA.

#### KeithWalker

Joined Jul 10, 2017
1,409
the current will be upto some 50 mA.
You mentioned 5 wires. Do the other three carry the data signal from the sensor? Is it a communication bus of some kind?

Joined Jul 29, 2019
61
I would use a Mil Spec connector. I have attached an image of the bulkhead side. This connector is made by Amphenol but you can also use Tyco as they make this type of connector too. I would solder the wiring to the PCB and use a bulkhead mount on the case.

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#### nsaspook

Joined Aug 27, 2009
7,897
I would use a Mil Spec connector. I have attached an image of the bulkhead side. This connector is made by Amphenol but you can also use Tyco as they make this type of connector too. I would solder the wiring to the PCB and use a bulkhead mount on the case.
Those are nice but maybe a little overkill for this application.

#### KeithWalker

Joined Jul 10, 2017
1,409
How long are the wires? Will the three wires carrying the data need to be shielded or twisted pair? We still don't know what the data signal is. It could be a DC level or a full blown fast communications bus. How can we recommend the best connector without knowing?

Joined Jul 29, 2019
61
Mil Spec connectors are made for analog, digital, and data. You just have to select the correct one.

Joined Jul 18, 2013
22,049
Hi,
I need to connect 5 wire from pcb to outer terminal,
whether soldering the wire is a better method, or is there any other method for connecting the wire with pcb. it should withstand even in hard environmental conditions.
Thanks,
D
I generally use screw terminals mounted to the PCT board.
If the 'outer terminal' means external to the PCT enclosure then there is a much cheaper plastic version of the \$MS (military connector) shown earlier in post #8.
These have various pin out numbers and come with strain relief for a flexible cord/cable etc.
If a straight transmission out, then instead of connector, a plastic strain relief is also available.
Max.