A1185 and A1186
A1185-DS, Rev. 1
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
AB SO LUTE MAX I MUM RAT INGS
Supply Voltage, V
CC
..........................................28 V
Reverse-Supply Voltage, V
RCC
........................–18 V
Magnetic Flux Density, B .........................Unlimited
Operating Temperature
Ambient, T
A
, Range E..................–40ºC to 85ºC
Ambient, T
A
, Range L................–40ºC to 150ºC
Maximum Junction, T
J(max)
........................165ºC
Storage Temperature, T
S
..................–65ºC to 170ºC
On-chip protection
null Supply transient protection
null Reverse-battery protection
null On-board voltage regulator
null 3.5 V to 24 V operation
Ultrasensitive Two-Wire Field-Programmable Chopper-Stabilized
Unipolar Hall-Effect Switches
Package LH, 3-pin SOT
Features and Benefits
1. VCC
2. No connection
3. GND
NC
1 2
3
1 2 3
1. VCC
2. GND
3. GND
Package UA, 3-pin SIP
Chopper stabilization
null Low switchpoint drift over operating
temperature range
null Low stress sensitivity
Field-programmable for optimized
switchpoints
The A1185 and A1186 are ultrasensitive, two-wire, unipolar Hall effect switches.
The operate point, B
OP
, can be field-programmed, after final packaging of the sen-
sor and placement into the application. This advanced feature allows the optimiza-
tion of the sensor switching performance, by effectively accounting for variations
caused by mounting tolerances for the device and the target magnet.
This family of devices are produced on the Allegro MicroSystems new DABIC5
BiCMOS wafer fabrication process, which implements a patented, high-frequency,
chopper-stabilization technique that achieves magnetic stability and eliminates
the offsets that are inherent in single-element devices exposed to harsh applica-
tion environments. Commonly found in a number of automotive applications,
the A1185 and A1186 devices are utilized to sense: seat track position, seat belt
buckle presence, hood/trunk latching, and shift selector position.
Two-wire unipolar switches are particularly advantageous in price-sensitive appli-
cations, because they require one less wire than the more traditional open-collec-
tor output switches. 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 protec-
tion and a Zener clamp on the power supply to protect against overvoltage condi-
tions 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 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.