3046, 3056,
AND
3058
The A3046EU/LU, A3056EU/LU, and A3058EU/LU Hall effect
gear-tooth sensors are monolithic integrated circuits that switch in
response to differential magnetic fields created by ferrous targets.
These devices are ideal for use in gear-tooth-based speed, position,
and timing applications and operate down to zero rpm over a wide
range of air gaps and temperatures. When combined with a back-
biasing magnet and proper assembly techniques, devices can be
configured to give 50% duty cycle or to switch on either leading,
trailing, or both edges of a passing gear tooth or slot.
HALL EFFECT GEAR-TOOTH SENSORS
–ZERO SPEED
Data Sheet
27612A†
X
X
V
CC
1
2
3
GROUND
OUTPUT
SUPPLY
The six devices differ only in their magnetic switching values and
operating temperature ranges. The low hysteresis of the A3046/56EU
and A3046/56LU makes them perfectly suited for ABS (anti-lock brake
system) or speed sensing applications where maintaining large air
gaps is important. The A3046EU/LU features improved switch point
stability with temperature over the A3056EU/LU. The high hysteresis
of the A3058EU and A3058LU, with their excellent temperature
stability, makes them especially suited to ignition timing applications
where switch-point accuracy (and latching requirements) is extremely
important.
Continued next page...
BENEFITS
Dwg. PH-012
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
. . . . . . . . . . . . . .
28 V
Reverse Battery Voltage,
V
RCC
. . . . . . . . . . . . . . . . . . . . . .
-30 V
Magnetic Flux Density, B . . . . .
Unlimited
Output OFF Voltage, V
OUT
. . . . . . . . .
28 V
Reverse Output Voltage, V
OUT
. . . . .
-0.5 V
Output Current, I
OUT
. . . . . . . . . . . .
25 mA
Package Power Dissipation, P
D
. .
500 mW
Operating Temperature Range, T
A
Suffix “EU” . . . . . . . . .
-40
°
C to +85
°
C
Suffix “LU” . . . . . . . .
-40
°
C to +150
°
C
Storage Temperature Range,
T
S
. . . . . . . . . . . . . . .
-65
°
C to +170
°
C
I
I
I
I
I
I
I
I
I
Senses Ferrous Targets Down to Zero RPM
Large Effective Air Gap
Wide Operating Temperature Range
Operation from Unregulated Supply
High-Speed Operation
Output Compatible With All Logic Families
Reverse Battery Protection
Solid-State Reliability
Resistant to Physical Stress
SELECTION GUIDE
Switching Hysteresis
15-90 G
Operating Temp. Range
-40°C to +85°C
-40°C to +150°C
A3046EU
A3056EU
A3046LU
A3056LU
150-250 G
A3058EU
A3058LU
Device Type Number
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
