3141
THRU
3144
SENSITIVE
HALL-EFFECT SWITCHES
FOR HIGH-TEMP. OPERATION
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
TYPICAL OPERATING CHARACTERISTICS (cont.)
CHANGE IN OPERATE POINT
10 15 20 25
SUPPLY VOLTAGE IN VOLTS
0
Dwg. GH-042-1
5
CHANGE IN OPERATE POINT IN GAUSS
-5.0
0
5.0
10
15
20
T = +25°C
A
OPERATION
The output of these devices (pin 3) switches low when the magnetic field
at the Hall sensor exceeds the operate point threshold (B
OP
). At this point, the
output voltage is V
OUT(SAT)
. When the magnetic field is reduced to below the
release point threshold (B
RP
), the device output goes high. The difference in
the magnetic operate and release points is called the hysteresis (B
hys
) of the
device. This built-in hysteresis allows clean switching of the output even in
the presence of external mechanical vibration and electrical noise.
Extensive applications information for Hall-effect sensors is available in:
• Hall-Effect IC Applications Guide, Application Note 27701;
• Hall-Effect Devices: Soldering, Gluing, Potting, Encapsulating, and Lead
Forming, Application Note 27703.1;
• Soldering of Through-Hole Hall-Sensor Dervices, Application Note 27703;
and
• Soldering of Surface-Mount Hall-Sensor Devices, Application Note 27703.2.
All are provided in Allegro Electronic Data Book, AMS-702. or at
www.allegromicro.com
SENSOR LOCATIONS
(±0.005” [0.13 mm] die placement)
1 32
Dwg. MH-011-10A
0.0195"
0.50 mm
NOM
BRANDED
SURFACE
ACTIVE AREA DEPTH
0.082"
2.07 mm
0.055"
1.39 mm
A
Suffix “UA”
Suffix “LT”
0.043"
1.09 mm
1 32
Dwg. MH-008-2D
0.0305"
0.775 mm
NOM
ACTIVE AREA DEPTH
0.089"
2.26 mm
A
Allegro
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