A1140/41/42/43
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
ELECTRICAL CHARACTERISTICS
over the operating voltage and temperature range, unless otherwise specified
Characteristic
Supply Voltage
Symbol
V
CC
I
CC(L)
I
CC(H)
Zener Clamp Supply Voltage
Zener Clamp Supply Current
2
Output Slew
Rate
3
V
Z(supply)
I
Z(supply)
di/dt
f
C
t
on
POS
After factory programming; with and without
bypass capacitor (C
BYP
= 0.01 µF)
t
on
≤
t
on(max)
;
V
CC
slew rate
≥
25 mV/µs
Test Conditions
Device powered on
B >B
OP
for A1140; B <B
RP
for A1141
B >B
OP
for A1142; B <B
RP
for A1143
B >B
OP
for A1141, A1143
B <B
RP
for A1140, A1142
I
CC
= I
CC(max)
+ 3 mA; T
A
= 25°C
V
Z(supply)
= 28 V
No bypass capacitor; capacitance of the
oscilloscope performing the measurement
= 20 pF
Min.
3.5
2
5
12
28
–
–
–
–
–
Typ.
–
–
–
–
–
–
36
400
–
HIGH
Max.
24
5
6.9
17
40
10
–
–
25
–
Units
V
mA
mA
mA
V
mA
mA/µs
kHz
µs
–
Supply Current
1
Chopping Frequency
Power-On Time
4
Power-On State
5
1
Relative
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
fi
eld (or a weaker north polarity
fi
eld, if present).
2
The maximum value for I
Z(supply)
is equal to I
CC(L)MAX
+ 3 mA.
3
The value of di is the difference between 90% of I
CC(H)
and 10% of I
CC(L)
, and the value of dt is time period between those two points. The value of di/dt
depends on the value of the bypass capacitor, if one is used, with greater capacitances resulting in lower rates of change.
4
The value of t depends on the value of the bypass capacitor, if one is used, with greater capacitances resulting in longer t .
on
on
5
A V slew rate less than 25 mV/µs affects device performance, both while powering-on and while running. For t > t
CC
on
on(max)
, and B
RP
< B < B
OP
, POS
is undefined.
MAGNETIC CHARACTERISTICS*
over the operating voltage and temperature range, unless otherwise specified
Characteristic
Operate Point
Release Point
Hysteresis
Symbol
B
OP
B
RP
B
HYS
Test Conditions
I
CC(H)
→
I
CC(L)
I
CC(L)
→
I
CC(H)
I
CC(L)
→
I
CC(H)
I
CC(H)
→
I
CC(L)
for A1140, A1142
for A1141, A1143
for A1140, A1142
for A1141, A1143
Min.
50
45
5
Typ.
85
–
15
Max.
115
110
30
Units
G
G
G
B
HYS
= B
OP
– B
RP
*Relative 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
fi
eld (or a weaker north polarity
fi
eld, if present).
A1140-DS
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
3
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
