A1101, A1102, A1103, A1104, and A1106
Continuous-Time Switch Family
FEATURES AND BENEFITS
DESCRIPTION
• AEC-Q100 automotive qualified
• Continuous-time operation
□ Fast power-on time
The Allegro™ A1101-A1104 and A1106 Hall-effect switches
are next generation replacements for the popular Allegro
312x and 314x lines of unipolar switches. The A110x family,
produced with BiCMOS technology, consists of devices that
□ Low noise
• Stable operation over full operating temperature range
• Reverse battery protection
• Solid-state reliability
• Factory-programmed at end-of-line for optimum
performance
• Robust EMC performance
feature fast power-on time and low-noise operation. Device
programmingisperformedafterpackaging,toensureincreased
switchpointaccuracybyeliminatingoffsetsthatcanbeinduced
by package stress. Unique Hall element geometries and low-
offset amplifiers help to minimize noise and to reduce the
residualoffsetvoltagenormallycausedbydeviceovermolding,
temperature excursions, and thermal stress.
• High ESD rating
• Regulator stability without a bypass capacitor
The A1101-A1104 and A1106 Hall-effect switches include
the following on a single silicon chip: voltage regulator, Hall-
voltage generator, small-signal amplifier, Schmitt trigger, and
NMOS output transistor. The integrated voltage regulator
permits operation from 3.8 to 24 V. The extensive on-board
protectioncircuitrymakespossiblea±30Vabsolutemaximum
voltage rating for superior protection in automotive and
industrial motor commutation applications, without adding
external components. All devices in the family are identical
except for magnetic switchpoint levels.
Packages:
3-pin SOT23W (suffix LH)
3-pin SIP (suffix UA)
The small geometries of the BiCMOS process allow these
devices to be provided in ultrasmall packages. The package
styles available provide magnetically optimized solutions for
mostapplications.PackageLHisanSOT23W,aminiaturelow-
profilesurface-mountpackage,whilepackageUAisathree-lead
ultramini SIPfor through-hole mounting. Each package is lead
(Pb) free, with 100% matte-tin-plated leadframes.
LH: A1101, A1102,
A1103, A1104, and
A1106
UA: A1101,
A1102, A1103,
and A1104
Not to scale
UA: A1106
VCC
Regulator
To all subcircuits
VOUT
Amp
Gain
Offset
Trim
Control
GND
Functional Block Diagram
A1101-DS, Rev. 16