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Low Current Ultrasensitive Two-Wire
Chopper-Stabilized Unipolar Hall Effect Switches
A1147 and
A1148
2
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Selection Guide
Part Number    Pb-Free
Packing
1
Package
Operating Ambient
Temperature, T
A
 (癈)
Output Level in
South (+) Field
2
A1147ELHLT-T
Yes   Tape and Reel, 3000 pieces/reel
Surface Mount
40 to 85
Low
A1147EUA-T
Yes   Bulk Bag, 500 pieces/bag
Through Hole
A1147LLHLT-T
Yes   Tape and Reel, 3000 pieces/reel
Surface Mount
40 to 150
A1147LUA-T
Yes   Bulk Bag, 500 pieces/bag
Through Hole
A1148ELHLT-T
Yes   Tape and Reel, 3000 pieces/reel
Surface Mount
40 to 85
High
A1148EUA-T
Yes   Bulk Bag, 500 pieces/bag
Through Hole
A1148LLHLT-T
Yes   Tape and Reel, 3000 pieces/reel
Surface Mount
40 to 150
A1148LUA-T
Yes   Bulk Bag, 500 pieces/bag
Through Hole
1
Contact Allegro for additional packing options.
2
South (+) magnetic fields must be of sufficient strength.
 
 
feature on-chip transient protection and a Zener clamp to protect
against overvoltage conditions on the supply line.
The output currents of the A1148 switches HIGH in the presence
of a south (+) polarity magnetic field of sufficient strength, and
switches LOW otherwise, as in the presence of a weak field or a
north () polarity field. The A1147 has an opposite output: the
currents switch LOW in the presence of a south-polarity magnetic
field of sufficient strength, and switch HIGH otherwise.
Both versions are offered in two package styles. The LH is a SOT-
23W, miniature low-profile package for surface-mount applications.
The UA is a three-lead ultramini SIP for through-hole mounting.
Each package is available in a lead (Pb) free version (suffix, T)
with 100% matte tin plated leadframe. Field-programmable versions
also available: A1180 and A1181.
Absolute Maximum Ratings
Characteristic
Symbol
Notes
Rating    Units
Supply Voltage
V
CC
28
V
Reverse Supply Voltage
V
RCC
18
V
Magnetic Flux Density
B
Unlimited
G
Operating Ambient Temperature
T
A
Range E
40 to 85
篊
Range L
40 to 150    篊
Maximum Junction Temperature
T
J
(max)
165
篊
Storage Temperature
T
stg
65 to 170    篊
Description (continued)
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