I need help identifying a hall effect sensor
The sensor looks like a flattened version of a TO-92 with chamfered edges instead of a rounded face to indicate the front side and .1" lead spacing. The only markings are U18 020 (or possibly U1B). It looks like it might be from http://www.utc-ic.com/product/db/hall.php but the part numbers don't all match although the datasheet looks like it might match. http://www.scribd.com/doc/52101789/U18-Hall-Sensor-Fan
It doesn't seem like places like DigiKey or Mouser sells Unisonic parts so I may need an compatible alternative which would be fine If I can figure out the specs.