Sensitive Two-Wire Field-Programmable
Chopper-Stabilized Unipolar Hall Effect Switches
A1180, A1181,
A1182, and A1183
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 Packing
1
Mounting
Ambient, T
A
(°C)
Output
South (+) Field
2
Supply Current at Low
Output, I
CC(L)
(mA)
A1180ELHLT-T
3
7-in. reel, 3000 pieces/reel Surface mount
–40 to 85 Low 2 to 5
A1180LUA-T
4
Bulk, 500 pieces/bag SIP through hole
A1182ELHLT-T
4
7-in. reel, 3000 pieces/reel Surface mount
–40 to 85
Low
5 to 6.9
A1182EUA-T
4
Bulk, 500 pieces/bag SIP through hole
A1182LLHLT-T
4
7-in. reel, 3000 pieces/reel Surface mount
–40 to 150
A1182LUA-T
4
Bulk, 500 pieces/bag SIP through hole
A1183ELHLT-T
4
7-in. reel, 3000 pieces/reel Surface mount
–40 to 85
High
A1183EUA-T
4
Bulk, 500 pieces/bag SIP through hole
A1183LLHLT-T
4
7-in. reel, 3000 pieces/reel Surface mount
–40 to 150
A1183LUA-T
4
Bulk, 500 pieces/bag SIP through hole
1
Contact Allegro for additional packing options.
2
South (+) magnetic fields must be of sufficient strength.
3
This variant is in production, however, it has been deemed Pre-End of Life. The product is approaching end of life. Within a minimum of 6 months, the device
will enter its final, Last Time Buy, order phase. Status change: January 31, 2011. Suggested replacement: A1190LLHLX-T.
4
Variant is in production but has been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of the variant is currently restricted to
existing customer applications. The variant should not be purchased for new design applications because obsolescence in the near future is probable. Samples
are no longer available. Status change: January 31, 2011.
wire than the more traditional open-collector output switches.
Additionally, the system designer gains inherent diagnostics
because output current normally fl ows in either of two narrowly-
specifi ed ranges. Any output current level outside of these two
ranges is a fault condition. The A1180-83 family of devices also
features on-chip transient protection, and a Zener clamp to protect
against overvoltage conditions on the supply line.
The output currents of the A1181 and A1183 switch
HIGH in the
presence of a south polarity magnetic fi eld of suffi cient strength;
and switch LOW otherwise, including when there is no signifi cant
magnetic fi eld present. The A1180 and A1182 have inverted out-
put current levels: switching LOW in the presence of a south polar-
ity magnetic fi eld of suffi cient strength, and HIGH otherwise. The
devices also differ in their specifi ed LOW current supply levels.
Both devices are offered in two package styles: LH, a SOT-23W
miniature low-profi le package for surface-mount applications,
and UA, a three-lead ultramini Single Inline Package (SIP) for
through-hole mounting. Each package is available in a lead (Pb)
free version (suffi x, –T) with 100% matte tin plated leadframe.
Factory-programmed versions are also available. Refer to: A1140,
A1141, A1142, A1143, A1145, and A1146.
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 ºC
Range L –40 to 150 ºC
Maximum Junction Temperature T
J
(max) 165 ºC
Storage Temperature T
stg
–65 to 170 ºC
Description (continued)