3212
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
SENSOR LOCATIONS
(±0.005 [0.13 mm] die placement)
OUTPUT OFF
5 V
MAX
B
B
OPN
OPS
Package Designator ‘LH’
ACTIVE AREA DEPTH
0.011"
0.059"
0.28 mm
1.49 mm
NOM
3
0.038"
0.96 mm
B
B
RPS
RPN
OUTPUT ON
0
0
A
-B
+B
MAGNETIC FLUX
1
2
Dwg. GH-043-1
Dwg. MH-025
Applications. Allegro's pole-independent sensing technique
allows for operation with either a north pole or south pole
magnet orientation, enhancing the manufacturability of the
device. The state-of-the-art technology provides the same
output polarity for either pole face.
Package Designators ‘UA’, UA-LC', and ‘UA-TL’
It is strongly recommended that an external bypass capaci-
tor be connected (in close proximity to the Hall sensor) between
the supply and ground of the device to reduce both external
noise and noise generated by the chopper-stabilization tech-
nique. This is especially true due to the relatively high imped-
ance of battery supplies.
ACTIVE AREA DEPTH
0.0195"
0.081"
0.50 mm
2.06 mm
NOM
0.057"
1.45 mm
The simplest form of magnet that will operate these devices
is a bar magnet with either pole near the branded surface of the
device. Many other methods of operation are possible. Exten-
sive applications information on magnets and Hall-effect
sensors is also available in the Allegro Electronic Data Book
AMS-702 or Application Note 27701, or at
A
BRANDED
SURFACE
1
2
3
www.allegromicro.com
Dwg. MH-011-11A
Although sensor location is accurate to three sigma for a
particular design, product improvements may result in small
changes to sensor location.
OUTPUT
10 pF
X
SUPPLY
(3 V BATTERY)
0.1 µF
Dwg. EH-013-2
Allegro
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6
SANKEN [ SANKEN ELECTRIC ]
