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Recognize the Device?

11/17/2019 5:10 AM

hello every one Please kindly recognize above device as in my search i found may be its linear hall effect sensor but not exactly sure because not found any device with this exact name so..please help to recognize this waiting for your reply.. thanks in advance.. AH4 printed on the device and its package is SOT-23 or SC59

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#1

Re: recognize the device

11/17/2019 7:11 AM

Not enough information.

What type of circuit is it used in?

A schematic would be helpful,as would a full board picture,showing other components and layout.

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#2

Re: recognize the device

11/17/2019 8:10 AM

SOT-23 seem to be small outline transistor as per wikepedia:

https://en.wikipedia.org/wiki/Small-outline_transistor

You may find further details at the links in the web page.

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#3

Re: recognize the device

11/17/2019 9:53 AM

I know this is probably a worthless response but I'll give it anyway. The IC in your photograph is soldered in such a poor manner that it could have worked for a while (days, weeks, years) and then just failed. If this is a picture of the actual IC in the actual circuit then fix the solder joint and retest.

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#13
In reply to #3

Re: recognize the device

11/18/2019 9:52 AM

My thought exactly!

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#4

Re: Recognize the Device?

11/17/2019 10:26 AM

I suspect you have a transistor but it very well might be a hall effect sensor. (They also have three leads.) What I do see that nobody has yet commented is that this part is poorly placed and soldered. The lead nearest the "4" is likely not making a good connection to the solder pad. If that is a hall effect device, that lead is often the output lead but any of the three leads missing a connection will cause the circuit to fail.

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#5

Re: Recognize the Device?

11/17/2019 12:23 PM
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#6

Re: Recognize the Device?

11/17/2019 1:13 PM

Looks like a two-diode (fullwave) rectifier: two AC inputs, one DC output. What does the schematic show it to be?

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#7

Re: Recognize the Device?

11/17/2019 1:30 PM
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#10
In reply to #7

Re: Recognize the Device?

11/18/2019 4:51 AM

i also get the same result sir, but is that same part?? my question is this..

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#8

Re: Recognize the Device?

11/17/2019 2:25 PM

Frankly this looks like an added part, possibly added in an attempt to correct a problem with the board...it looks like only two of the mounting points are being used...so it might have some sort of capacitance effect to amplify a signal, but I'm just guessing....

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#9

Re: Recognize the Device?

11/17/2019 3:00 PM

Hall effect sensor.

Output has a possible intermittent open that may obfuscate the operation.

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#11

Re: Recognize the Device?

11/18/2019 5:59 AM

As others have indicated the soldering is unsatisfactory. The soldering in fact looks like manual rework (based on solder volume and fillet details) and so the part may not even be the original intended item.

If the part was custom made for a manufacturer, then it is even possible that the "AH4" is simply a batch code. From your picture, the part also seems devoid of manufacturer's brands.

Sorry that I cannot provide anything positive to assist your quest.

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#12

Re: Recognize the Device?

11/18/2019 7:39 AM

Most of the AH49E hall effect devices appear to be marked 49E

https://www.google.co.uk/search?hl=en-GB&tbm=isch&sxsrf=ACYBGNTZ0UicJK6BIJGDpqm71tnPQfLB9g%3A1574077984114&source=hp&biw=1321&bih=608&ei=IIbSXczMBIneatnpj6AO&q=AH49E&oq=AH49E&gs_l=img.3..0j0i24.10282.13972..23813...0.0..0.105.456.5j1......0....1..gws-wiz-img.....10..35i362i39j35i39j0i131j0i5i30.3F8qORY9NEI&ved=0ahUKEwjM3Nu42fPlAhUJrxoKHdn0A-QQ4dUDCAY&uact=5#imgrc=_

Is it in a position where a hall effect sensor would be likely to be used (somewhere where something with a magnet can get pretty close)?

The board appears to have been laid out for a larger device so it might just be a substitute transistor (which does need to be re-soldered).

Can you give more information about the board/application?

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