AH49F

Document number: DS36518

Rev. 2 - 2

4 of 12

www.diodes.com

June 2014

© Diodes Incorporated

AH49F

A Product Line of

Diodes Incorporated

South Pole

When there is no external magnetic field (B=0Gauss), the quiescent output voltage is one-half the supply voltage in general.

For TO-92S and U-DFN2020-6 packages, if a South magnetic pole approaches the part marking surface (the side with part marking ID) of the Hall

effect sensor, the circuit will drive the output voltage higher. In contrary, a North magnetic pole will drive the output voltage lower. The variations of

voltage level up or down from the quiescent output voltage (the null voltage) are symmetrical and is proportional to the magnetic flux density. In

the SC59 the die is placed underneath the lead frame and therefore when a magnet pole approaches the SC59 part marking surface, the direction

of the magnetic field in to the die is reversed compared to TO-92S. This results in a reverse response to the magnetic flux density in SC59

package compared with TO-92S and U-DFN2020-6 packages. (i.e. if the reverse magnetic pole approaches the part marking surface of SC59, the

output is the same as TO-92S package.) The largest magnetic sensitivity is obtained with a supply voltage of 8V, but at the cost of increased

supply current and a slight loss of output symmetry. So, it is not recommended to work in such condition unless the output voltage magnitude is a

main issue. The output signal can be capacitively coupled to a next-level amplifier for further amplifying if the changing frequency of the magnetic

field is high.

Transfer Characteristic

Magnetic Characteristic (For TO-92S)

Magnetic Characteristic (For SC59)

Magnetic Characteristic (For U-DFN2020-6)

800

-800

400

-400

0

1.0V

2.5V

4.0V

Typical

Output

Voltage

V

B (Gauss)

North Pole