7

A1145-DS, Rev. 6

Worcester, Massachusetts 01615-0036 (508) 853-5000

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches

A1145 and A1146

Functional Description

B+

B–

I+

0

(A) A1145

B+

I+

B–

0

(B) A1146

Operation

netic field at the Hall sensor exceeds the operate point threshold,

ences between the magnetic operate and release point is called

clean switching of the output even in the presence of external

mechanical vibration and electrical noise. The A1146 device

in comparison to the A1145 (see figure 1).

Figure 1. Alternative switching behaviors are available in the A114x device family. On the horizontal axis, the B+ direction indicates

increasing south polarity magnetic field strength, and the B– direction indicates decreasing south polarity field strength (including the

case of increasing north polarity).