Looking for an ultra cheap hall effect sensor

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I'm working on an AVR project that needs a cheapest, grungiest hall effect sensor I can find. Surface mount preffered, but through-hole is OK, too. Unipolar or bipolar doesn't matter. Probably would use under 1000 units.

Any suggestions out there from FreakLand?

Thanks,
Lalox

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"Ultracheap" and "Hall Effect" do not generally appear in the same sentence. Or paragraph.

What is your application? Detecting a magnetic field? Current sensing? Other? Analog (proportional) or digital (on-off)?

Jim

 

Until Black Lives Matter, we do not have "All Lives Matter"!

 

 

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The application is magnetic sensing. Digital output is acceptable. Nothing fancy going on here.

And "Ultra cheap" and "Hall Effect" actually can go together fairly well. :)
I can find some for around USD 0.50 each. But there's go to be some for half that price!

- Lalox

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There are all sorts of reasons given for not cheap hall effect.

Low volumes
Not standard silicon processing
Odd packages

Actually, I'm a bit surprised even at the 0.50 USD. Given that a 2N3904 (in TO92) is about half that, and its volumes are probably orders of magnitude higher, and its easier to fab, I'd guess that finding lower price will be difficult.

Allegro has some new smt current-sense hall devices. Don't know price and they are linear. But, with newer technology, they may have been able to push down costs.

Jim

 

Until Black Lives Matter, we do not have "All Lives Matter"!

 

 

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How many? You need OEM or is surplus OK? Need a data sheet?

Electronic Goldmine has some (qty 4+) for 0.50 ea., and All Electronics has some for 0.35 (qty 100+). Neither of these appear to have readable part numbers....

Also there's a 185-piece assortment of Hall Effect sensors on eBay right now currently bid at $12.05 plus $4 S&H. That's about nine cents, but probably will rise as the auction continues.

( Just checked Arrow; 2N3904 is between two and six cents depending on manufacturer.)

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I forgot to check out some of the surplus places.

The All Electronics part (Sprague # UGN3030T / Allegro UGN3130T) just might do the trick and it is cheap.

Thank you all for the feedback!!

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If you ever plan to build any more of your product (beyond the 1000 units), it might be a good ideal to see if your "surplus" parts are still available from the OEM. Otherwise, you could have 1000 dinosaurs walking around.

I found some ultra cheap hall effects at Mouser from Everlight. One part is $0.25 each in 1K quantities and the other is $0.13. However, I could not located a datasheet for them on the Everlight website.

Here are the Mouser and Everlight links.

http://www.mouser.com/index.cfm?handler=data.getPcodes&pcode=Everlight%2BHall%2BIC%2BMagnetic%2BSensor&pcodenumber=63800

http://www.everlight.com/en_main.asp

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Yes, the Everlight part caught my eye the other day, but as you mentioned it looks like Everlight may be dropping the Hall effect product line.

There seems to be newer low power, SLOW omnipolar devices around for cellphone applications (detecting when the phone is flipped open). OK for simple digital sensing and the price should be low.

I'm looking into this company's devices: http://www.anpec.com.tw

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You should look at about a third of a dollar for parts in 5k quantities from allegro

Keep it simple it will not bite as hard

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I don;t know of any cheaper than what Allegro has. Strike up your best deal with them or a rep.
Unfortunately the "monkey brand" gray market parts will probably kill you off in the long run. But if you are looking for a small production run you might be able to find a batch of older obsolete parts for a good price from one of the surplus dealers. But you may be screwed if you have to increase production or make more later.
We once bought a few thousand gear tooth hall effect sensor off of Ebay, and those should last us for while, for our purposes.

Once upon a time, magnetic reed switches were popular, but now the reed switches cost more than the hall effect devices.