A3425LK ALLEGRO [Allegro MicroSystems], A3425LK Datasheet - Page 9

• Manufacturer Part Number: A3425LK
• Description: DUAL, CHOPPER-STABILIZED, ULTRA-SENSITIVE, BIPOLAR HALL-EFFECT SWITCH
• Manufacturer: ALLEGRO [Allegro MicroSystems]

Operating characteristics are limited by allowable package
power dissipation (P
ture (T
junction temperature (T
thermal resistance (R
This is shown in the graph on page 2.
sum of the two output powers (d.c. x I
(d.c. x I
V
120 C), it is easy to exceed the allowable package power
dissipation. In this case, the output currents or the supply
voltage must be reduced.
targets with a circular pitch of less than 4 mm, a perfor-
mance improvement can be observed by rotating the front
face of the sensor subassembly (see below). This sensor
rotation decreases the effective sensor-to-sensor spacing,
provided that the Hall elements are not rotated beyond the
width of the target.
CC
Actual or required package power dissipation is the
).
At high ambient operating temperatures (above about
A
1
A
OUT2
), which is defined by the maximum internal
P
2
1.00 mm
D
0.039"
x V
= (T
OUT(SAT)2
3
J
– T
D
4
) as a function of ambient tempera-
JA
A
J
)/R
= 177 C/W).
= 170 C) and the package
) and the sensor power (I
JA
TARGET FACE WIDTH, F
= (170 – T
>0.039 SIN
>1.00 SIN
OUT1
(mm)
(inch)
A
)/177
x V
OUT(SAT)1
For
CC
x
) +
external 0.01 F bypass capacitor be connected (in close
proximity to the Hall sensor) between the supply and
ground of the device to reduce both external noise and
noise generated by the internal logic.
devices is a ring magnet. Other methods of operation,
such as linear magnets, are possible. Extensive applica-
tions information on magnets and Hall-effect sensors is
also available in the “Hall-Effect IC Applications Guide”
which can be found in the latest issue of the Allegro
MicroSystems Electronic Data Book, AMS-702 or Appli-
cation Note 27701, or at
BIPOLAR HALL-EFFECT SWITCH
The simplest form of magnet that will operate these
DUAL, CHOPPER-STABILIZED,
Dwg. MH-024-1
www.allegromicro.com
It is strongly recommended that an
ULTRA-SENSITIVE,
3425