Hall Sensor that Outputs High @ Bop

**mxm** · 8th July 2009 11:58 PM

I need help finding a Hall sensor that outputs high when ON to drive a PhotoMOS. I've spent several hours pouring through Digi-Key, Jameco, and Mouser. All I find available in individual quantities are sensors that output low. The only workaround I can think of is to get a hex inverter, but I don't have a whole lot of room in my application.

My power source is +5V DC, 100 mA max load. The sensor can be ominpolar or unipolar. I just need it to turn on in the presence of a magnetic field. The PhotoMOS, driven by the output of the sensor, will be used as a switch to close a circuit. I'm open to other ideas for implementation as well.

**blueroomelectronics** · 9th July 2009 12:02 AM

A simple transistor can invert the output.

**mxm** · 9th July 2009 01:03 AM

Wow, thanks for the quick response. Will this do? http://www.rohm.com/products/databoo...f/dtc144ee.pdf

**birdman0_o** · 9th July 2009 01:06 AM

I grabbed some from Futurlec not too long ago, they act as a button when the magnetic field is near, if you apply a 'high' voltage it will be a high output when triggered

**mxm** · 9th July 2009 01:16 AM

Thanks Mike, I did check Futurelec as well, and what I found there was an Allegro 3503 that still had an output null voltage (B = 0 G) at one half the supply voltage. I'm afraid that might be too much and still drive the PhotoMOS on. In my application, I need the PhotoMOS off when the magnet moves away from the sensor.

**birdman0_o** · 9th July 2009 02:05 AM

My mistake! In my head a Hall sensor was a Reed sensor, I guess a Reed sensor doesnt apply to your project?

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