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I am a little confused on how this W171Dip-7 relay works. I know 2 is pos 5v and 6 is neg 5v. Looks like the signal from 1/14 will go to 8 / 7 when closed. But i cant tell if 13 is tied to 14 or just over lapping. Same with 9/8/7 or is 2 going straight to 13?

Any help would be great!

enter image description here

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  • \$\begingroup\$ does the relay have a 10 V coil? \$\endgroup\$
    – jsotola
    Oct 16, 2019 at 23:11
  • \$\begingroup\$ 5v coil according to datasheet \$\endgroup\$
    – Glen M
    Oct 16, 2019 at 23:12
  • \$\begingroup\$ 13 is not tied to 14 ... if it was, then 8 would have to be tied to 9 which would render the device completely useless \$\endgroup\$
    – jsotola
    Oct 16, 2019 at 23:14
  • \$\begingroup\$ 5v coil according to datasheet ... then 6 is connected to ground (0 V), not to -5 V \$\endgroup\$
    – jsotola
    Oct 16, 2019 at 23:16
  • \$\begingroup\$ yes correct on 5v., so is 13 and 9 just another way to energize the coil? \$\endgroup\$
    – Glen M
    Oct 16, 2019 at 23:26

3 Answers 3

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schematic

simulate this circuit – Schematic created using CircuitLab

Figure 1. Redrawn relay pinout.

enter image description here

Figure 2. Datasheet schematic.

But i cant tell if 13 is tied to 14 or just overlapping.

The schematic is inconsistent. There is a dot to indicate a connection on 1-14 but it is missing on 7-8. If 1 was connected to 2 then 6 would be connected to 7 and the relay would short circuit the coil when energised.

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It's a reed relay in a DIP package. Each connection goes to two pins, because that makes the internal lead frame more robust.

  • pins 1 and 14 are one of the reed contacts
  • pins 2 and 13 are the positive end of the coil and diode combo
  • pins 6 and 9 are the negative end of the coil/diode.
  • pins 7 and 8 are the other reed contact
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Based on the diagram you provide, every connection on the relay is broken out to two pins.

  • Pin 1 is connected to 14
  • Pin 2 is connected to 13
  • Pin 6 is connected to 9
  • Pin 7 is connected to 8

This gives you options on how you actually connect to the relay. You can energize the relay from pins 2 and 6, or 13 and 9, or a combination of them.

When I search for the W171DIP-7, I find the following datasheet. Page 10 shows the pinout, and appears that pins 9 and 13 are not connected. Maybe a different manufacturer?

W171DIP-7 Datasheet

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