A1143ELHLT Allegro Microsystems Inc, A1143ELHLT Datasheet - Page 7

• Manufacturer Part Number: A1143ELHLT
• Description: IC SWITCH HALL EFFECT UNI SOT-23
• Manufacturer: Allegro Microsystems Inc
• Type: Unipolar Switchr

Specifications of A1143ELHLT

• Sensing Range: 110G Trip, 45G Release
• Voltage - Supply: 3.5 V ~ 24 V
• Current - Supply: 6.9mA
• Output Type: Digital, Open Drain
• Features: Regulated Voltage
• Operating Temperature: -40°C ~ 85°C
• Package / Case: SOT-23W
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output (max): -

A1140, A1142, and
A1143
Operation
The output, I
after the magnetic field at the Hall element exceeds the oper-
ate point threshold, B
below the release point threshold, B
high. The differences between the magnetic operate and release
point is called the hysteresis of the device, B
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).
CC
, of the A1140 and A1142 devices switch low
I+
0
B–
OP
(A) A1140, A1142
. When the magnetic field is reduced to
B
HYS
RP
, the device output goes
HYS
B+
. This built-in
I
I
CC(H)
Functional Description
CC(L)
Sensitive Two-Wire Chopper-Stabilized
hysteresis allows clean switching of the output even in the pres-
ence of external mechanical vibration and electrical noise. The
A1143 device switches with opposite polarity for similar B
and B
figure 1).
Unipolar Hall Effect Switches
RP
values, in comparison to the A1140 and A1142 (see
I+
0
B–
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
(B) A1143
B
HYS
B+
I
I
CC(H)
CC(L)
OP
7