UGN3503U

Supply Voltage, V_CC ..................................................... 8 V
Magnetic Flux Density, B ...................................... Unlimited
Operating Temperature Range, T............. -20°C to +85°C
Storage Temperature Range, T_S ............ -65°C to +150°C

The output null voltage (B = 0 G) is nominally one-half the supply voltage. A south magnetic pole, presented to the branded face of the Halleffect sensor will drive the output higher than the null voltage level. A north magnetic pole will drive the output below the null level.

In operation, instantaneous and proportional output-voltage levels are dependent on magnetic flux density at the most sensitive area of the device. Greatest sensitivity is obtained with a supply voltage of 6 V, but at the cost of
increased supply current and a slight loss of output symmetry. The sensor's output is usually capacitively coupled to an amplifier that boosts the output above the millivolt level.

In two applications shown, a permanent bias magnet is attached with epoxy glue to the back of the epoxy package.

The presence of ferrous material at the face of the package acts as a flux concentrator. The south pole of a magnet is attached to the back of the package if the Hall-effect IC is to sense the presence of ferrous material. The north pole of a magnet is attached to the back surface if the integrated circuit is to sense the
absence of ferrous matrial.

Calibrated linear Hall devices, which can be used to determine the actual flux density presented to the sensor in a particular application, are available.