Sensitive Two-Wire Chopper-Stabilized
Unipolar Hall Effect Switches
A1140, A1141,
A1142, and A1143
ELECTRICAL CHARACTERISTICS over the operating voltage and temperature ranges, unless otherwise specified
Characteristic
Supply Voltage1
Symbol
Test Conditions
Min.
3.5
2
Typ.
–
Max.
24
Units
V
VCC
B>BOP for A1140; B<BRP for A1141
B>BOP for A1142; B<BRP for A1143
–
5
mA
mA
ICC(L)
5
-–
6.9
Supply Current2
B>BOP for A1141, A1143
B<BRP for A1140, A1142
ICC(H)
IRCC
12
-–
17
mA
Reverse Supply Current
VRCC = –18 V
–
28
–
–
–
–
–1.6
40
mA
V
Supply Zener Clamp Voltage VZSUPPLY ICC = ICC(L)(max) + 3 mA; TA = 25°C
ICC(L)(max)
+ 3 mA
Supply Zener Clamp Current
Output Slew Rate3
IZSUPPLY VZSUPPLY = 28 V
mA
Capacitance of the oscilloscope performing the
measurement = 20 pF
di/dt
–
36
–
mA/μs
Chopping Frequency
Power-On Time3
fC
ton
–
–
–
200
–
–
25
–
kHz
ꢀs
–
CBYPASS = 0.01 μF
Power-On State5,6
POS
t < ton; VCC slew rate > 25 mV/ꢀs
HIGH
1VCC represents the generated voltage between the VCC pin and the GND pin.
2Relative values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic
polarity; therefore greater B values indicate a stronger south polarity field (or a weaker north polarity field, if present).
3Measured without bypass capacitor between VCC and GND. Use of a bypass capacitor results in slower current change.
3Measured with and without bypass capacitor of 0.01 μF. Adding a larger bypass capacitor causes longer Power-On Time.
5POS is defined as true only with a VCC slew rate of 25 mV/μs or greater. Operation with a VCC slew rate less than 25 mV/μs can permanently harm
device performance.
6POS is undefined for t > ton or BRP < B < BOP
.
MAGNETIC CHARACTERISTICS over the operating voltage and temperature ranges, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.*
Max.
Units
A1140, A1142 ICC = ICC(L)
Operate Point
BOP
50
80
110
G
A1141, A1143
A1140, A1142 ICC = ICC(H)
A1141, A1143 CC = ICC(L)
BHYS = BOP – BRP
ICC = ICC(H)
Release Point
Hysteresis
BRP
45
5
65
15
105
30
G
G
I
BHYS
*Typical data are for initial design estimations only, and assume optimum manufacturing and application conditions, such as TA = 25°C and VCC = 12 V.
Performance may vary for individual units, within the specified maximum and minimum limits.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
4
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
