Identifying pin 1 of Analog Devices REF195

Question

I have the Analog Devices REF195GSZ, and it doesn't have a circle on either the top or bottom by a pin to indicate pin 1.

Looks like this:

The Photon · Accepted Answer · 2019-10-31 00:32:56Z

10

One edge of the package is beveled. Pin 1 is on the beveled side.

answered Oct 31, 2019 at 0:32

The Photon

128k3 gold badges162 silver badges305 bronze badges

\$\begingroup\$ damn, thanks! don't understand why manufacturers don't always put a circle smh. will accept the answer once the 7 min is up \$\endgroup\$
– Alex
Oct 31, 2019 at 0:35
1

\$\begingroup\$ And that weird dimple, which I've never seen. \$\endgroup\$
– TimWescott
Oct 31, 2019 at 1:06
1

\$\begingroup\$ well it is installed and works, so just confirming this was indeed correct. \$\endgroup\$
– Alex
Oct 31, 2019 at 3:27

Add a comment |

Dave Tweed · Accepted Answer · 2019-10-31 19:03:33Z

7

Three is a notch/gap near the left bottom pin (next to the P of P1744). This is pin 1.

Then pins are always counted counterclockwise, so the pin numbers are:

Pin numbers: 8 7 6 5
Text on IC:  REF195
Text on IC:  >G#031
Text on IC:  P1744
Pin numbers: 1 2 3 4

Dave Tweed

171k17 gold badges230 silver badges396 bronze badges

answered Oct 31, 2019 at 0:34

Michel Keijzers

13.9k18 gold badges73 silver badges141 bronze badges

Add a comment |

Peter Bennett · Accepted Answer · 2019-10-31 01:43:33Z

4

Besides the beveled edge and notch mentioned in the other answers, if you hold the part so the text is right-side-up, pin 1 is at the bottom left.

answered Oct 31, 2019 at 1:43

Peter Bennett

58.2k1 gold badge48 silver badges130 bronze badges

\$\begingroup\$ yup makes sense! \$\endgroup\$
– Alex
Oct 31, 2019 at 3:26
\$\begingroup\$ This is definitely not a fool proof method. Most often you'll be fine with this, but it's not always the case in general. \$\endgroup\$
– awjlogan
Oct 31, 2019 at 12:21

Add a comment |

3 Answers 3