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Description: Miniature Single Pull Single Throw switches. These are high quality Omron type B3F momentary on switches. This switch has a very large 10mm tall button. Perfect as an embedded switch behind an enclosure wall. Rated up to 50mA.

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Customer Comments

  • Because of its small footprint and tall shaft, this button spared my project from having to devise separate actuator mechanisms to extend each button up through a panel. (my project uses 8 of these, very closely spaced). But I have observed that the mechanism is somewhat delicate. These buttons can easily be compromised mechanically or rendered unusable with too much lateral pressure. Trust me, this can easily happen by accident during testing, handling, or while soldering additional components. Needless to say, replacing a switch already soldered into a PCB is a pain.

    Of course, once your final assembly is mounted so that the shafts pass through holes in your panel, they are protected from lateral motion. But in the mean time I strongly recommend making a kind of temporary front panel to protect a PCB assembly using these buttons. A spare piece of PC board with 1/8" drill holes (for the button shafts), mounted with 3/8" spacers works perfectly, providing a neat 3/32" of button shaft access for operation.

  • has anyone tried to mount a knob on these? I’m in need of a switch that is able to mount a knob on top (w/ set screw).. like a encoder w/ switch.. just no encoder..

  • I pulled a bunch of these out of an old VCR (or at least very similar). The ones I salvage kind of suck because they are so old but the button is nice and long and the click is nice (on the better ones that I salvaged). Really useful for some projects.

  • Digikey EG1865-ND, if you’re looking to move to production with your design. charliex’s datasheet looks right.

  • The pictures with ruler are not correct! The part is appr. 6mm wide not 12mm or ½ an inch. I found out the hard way after designing a pcb (not Eagle) with this part, and figuring out hole placement from photos. Wish you had a datasheet for reference.

    • Thank you very much for that info man, saved a poorly designed circuit dimensioned for 12mm instead of 6mm…

  • I couldn’t find this part in the SF eagle library.
    Is there a datasheet for this part?

    • It looks like this switch has the same footprint as the one with the the ~2mm button. They are under TAC_SWITCH in the library. It would be nice if there were more SFE product numbers in the descriptions.

  • Single Pull? Do you mean “Single Pole”?

Customer Reviews

4 out of 5

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0 of 1 found this helpful:

works well. Some cautions advised

Switch provides solid electrical contact and good tactile feel to confirm closure. Two issues to be aware of. Mechanically the switch does not have any side to side support, and can be damaged by pressing at an angle. So if you use these you’ll want to make sure you pass them through a stationary hole in your enclosure that is well matched to the diameter of the shaft, minimizing lateral movement. Second, the plastic the base is made of is pretty easily melted. So when you solder them onto your PCB, do it quickly. If you need to remove it you’ll need a rework station (hot air), and even then it may be damaged in the process.