A119x and A119x-F
Programmable, Chopper-Stabilized, Two-Wire Hall-Effect Switches
FEATURES AND BENEFITS
▪ꢀChoiceꢀofꢀfactory-setꢀtemperatureꢀcoefficientꢀ(TC)ꢀforꢀuseꢀ
with ferrite or rare-earth magnets
▪ꢀFieldꢀprogrammableꢀforꢀoptimizedꢀswitchpoints
▪ꢀAEC-Q100ꢀautomotiveꢀqualified
▫ꢀOn-boardꢀvoltageꢀregulator:ꢀ3ꢀtoꢀ24ꢀVꢀoperation
▪ꢀHigh-speed,ꢀ4-phaseꢀchopperꢀstabilization
▫ꢀLowꢀswitchpointꢀdriftꢀthroughoutꢀtemperatureꢀrange
▫ꢀLowꢀsensitivityꢀtoꢀthermalꢀandꢀmechanicalꢀstresses
▪ꢀOn-chipꢀprotectionꢀ
DESCRIPTION
The A119x and A119x-F comprise a family of two-wire,
unipolar,Hall-effectswitches,whichcanbetrimmedbytheuser
atend-of-linetooptimizemagneticswitchpointaccuracyinthe
application.Thelatter(-Foption)aretemperature-compensated
forusewithferritemagnets.Thesedevicesareproducedonthe
Allegro™ advancedBiCMOSwaferfabricationprocess,which
implements a high-frequency, 4-phase, chopper stabilization
technique. This technique achieves magnetic stability over
the full operating temperature range, and eliminates offsets
inherent in devices with a single Hall element that are exposed
to harsh application environments.
▫ꢀSupplyꢀtransientꢀprotection
▫ꢀReverse-batteryꢀprotection
▫ꢀIndustry-leadingꢀISOꢀ7637-2ꢀperformanceꢀthroughꢀuseꢀofꢀ
proprietary,ꢀ40ꢀVꢀclampingꢀstructure
▪ꢀSolid-stateꢀreliability
▪ꢀRobustꢀEMCꢀandꢀESDꢀperformanceꢀ
▪ꢀUBꢀpackageꢀwithꢀintegratedꢀ0.1ꢀµFꢀbypassꢀcapacitor
The A119x and A119x-F family has a number of automotive
applications.Theseincludesensingseattrackposition,seatbelt
bucklepresence,hood/trunklatching,andshiftselectorposition.
Two-wire unipolar switches are particularly advantageous in
cost-sensitive applications because they require one less wire
for operation versus the more traditional open-collector output
switches. Additionally, the system designer inherently gains
diagnostics because there is always output current flowing,
which should be in either of two narrow ranges. Any current
level not within these ranges indicates a fault condition.
PACKAGES
3-pin SOT23-W
2 mm × 3 mm × 1
mm (suffix LH)
3-pin ultramini SIP
1.5 mm × 4 mm × 3
mm (suffix UA)
2-pin ultramini SIP
1.5 mm × 4 mm × 4
mm (suffix UB)
All family members are offered in three package styles. The LH
is a SOT-23Wstyle, miniature, low-profile package for surface-
mount applications. The UA is a 3-pin, ultra-mini, single inline
package(SIP)forthrough-holemounting.TheUBisa2-pinsingle
inline package (SIP) for through-hole mounting that integrates
the power supply decoupling capacitor. All three packages are
lead (Pb) free, with 100% matte-tin leadframe plating.
Not to scale
UB package only
0.1 µF
V+
VCC
Program/Lock
OffsetAdjust
ICC Adjust
Regulator
To all subcircuits
LH & UA
package
only
Clock/Logic
0.01 µF
Polarity
Amp
Schmitt
Trigger
Low-Pass
Filter
GND
UA package only
GND
Functional Block Diagram
A1190-DS, Rev. 9
MCO-0000486
September 19, 2019
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