A1101, A1102, A1103, A1104, and A1106
Continuous-Time Switch Family
The Allegro
®
A1101-A1104 and A1106 Hall-effect switches are next generation
replacements for the popular Allegro 312x and 314x lines of bipolar switches.
The A110x family, produced with BiCMOS technology, consists of devices that
feature fast power-on time and low-noise operation. Device programming is per-
formed after packaging, to ensure increased switchpoint accuracy by eliminating
offsets that can be induced by package stress. Unique Hall element geometries and
low-offset amplifiers help to minimize noise and to reduce the residual offset volt-
age normally caused by device overmolding, temperature excursions, and thermal
stress.
The A1101-A1104 and A1106 Hall-effect switches include the following on a
single silicon chip: voltage regulator, Hall-voltage generator, small-signal ampli-
fier, Schmitt trigger, and NMOS output transistor. The integrated voltage regulator
permits operation from 3.8 to 24 V. The extensive on-board protection circuitry
makes possible a ±30 V absolute maximum 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.
The small geometries of the BiCMOS process allow these devices to be pro-
vided in ultrasmall packages. The package styles available provide magnetically
optimized solutions for most applications. Package LH is an SOT23W, a miniature
low-profile surface-mount package, while package UA is a three-lead ultramini
SIP for through-hole mounting. Each package is lead (Pb) free, with 100% matte
tin plated leadframes.
Package LH, 3-pin Surface Mount
GND
3
1
2
3
1
VCC
2
VOUT
Package UA, 3-pin SIP
Features and Benefits
1
VCC
2
GND
3
VOUT
Continuous-time operation
– Fast power-on time
1 2
3
– Low noise
Stable operation over full operating temperature range
Reverse battery protection
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
..........................................
30 V
Reverse-Supply Voltage, V
RCC
........................
–30 V
Output Off Voltage, V
OUT
..................................
30 V
Reverse-Output Voltage, V
ROUT
.....................
–0.5 V
Output Current, I
OUTSINK
...............................
25 mA
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
Solid-state reliability
Factory-programmed at end-of-line for optimum performance
Robust EMC performance
High ESD rating
Regulator stability without a bypass capacitor
A1101-DS
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
