A1185
and
A1186
Ultrasensitive Two-Wire Field-Programmable
Chopper-Stabilized Unipolar Hall Effect Switches
present. The A1185 has an inverted output current level: switching
LOW
in the presence of a south polarity magnetic field of sufficient
strength, and
HIGH
otherwise.
Both devices are offered in two package styles: LH, a SOT-23W
miniature low-profile 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
(suffix,
–T)
with 100% matte tin plated leadframe.
Factory-programmed versions are also available. Refer to: A1145
and A1146.
Description (continued)
Additionally, the system designer gains inherent diagnostics
because output current normally flows in either of two narrowly-
specified ranges. This provides distinct current ranges for I
OUT(H)
and I
OUT(L)
. Any output current level outside of these two ranges
is a fault condition.
Other features of the A1185 and A1186 devices include on-chip
transient protection and a Zener clamp on the power supply to protect
against overvoltage conditions on the supply line.
The output current of the A1186 switches
HIGH
in the presence of
a south polarity magnetic field of sufficient strength; and switches
LOW
otherwise, including when there is no significant magnetic field
Selection Guide
Part Number
A1185ELHLT-T
A1185EUA-T
A1185LLHLT-T
A1185LUA-T
A1186ELHLT-T
A1186EUA-T
A1186LLHLT-T
A1186LUA-T
1
Pb-based
Pb-free
1
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Packing
2
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
Mounting
Surface mount
4-pin SIP through hole
Surface mount
4-pin SIP through hole
Surface mount
4-pin SIP through hole
Surface mount
4-pin SIP through hole
Ambient, T
A
(°C)
–40 to 85
Output
South (+) Field
3
Supply Current at Low
Output, I
CC(L)
(mA)
Low
–40 to 150
5 to 6.9
–40 to 85
High
–40 to 150
variants are being phased out of the product line. Certain variants cited in this footnote are in production but have been determined to be NOT FOR NEW
DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design
applications because obsolescence in the near future is probable. Samples are no longer available. Status change: May 1, 2006. These variants include: A1185ELHLT,
A1185EUA, A1185LLHLT, A1185LUA, A1186ELHLT, A1186EUA, A1186LLHLT, and A1186LUA.
2
Contact Allegro for additional packing options.
3
South (+) magnetic fields must be of sufficient strength.
Absolute Maximum Ratings
Characteristic
Supply Voltage
Reverse Supply Voltage
Magnetic Flux Density
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
V
CC
V
RCC
B
T
A
T
J
(max)
T
stg
Range E
Range L
Notes
Rating
28
–18
Unlimited
–40 to 85
–40 to 150
165
–65 to 170
Units
V
V
G
ºC
ºC
ºC
ºC
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
2
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
