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Features and Benefits
Chopper stabilized amplifier stage
New miniature package / thin, high reliability package
Operation down to 3.5V
CMOS for optimum stability, quality and cost
Applications
Solid state switch
Limit switch
Current limit
Interrupter
Current sensing
Ordering Information
Part No.
US5881
US5881
Temperature Suffix
Package
Temperature Range
E
SO or UA
-40
o
C to 85
o
C Extended
L
SO or UA
-40
o
C to 150
o
C Automotive
*Contact factory or sales representative for legacy temperature options
Functional Diagram
Description
The US5881 is a unipolar Hall effect sensor IC fab-
ricated from mixed signal CMOS technology. It in-
corporates advanced chopper stabilization tech-
niques to provide accurate and stable magnetic
switch points. There are many applications for this
sensor in addition to those listed above. The de-
sign, specifications and performance have been
optimized for applications of solid state switches.
The output transistor will b switched on (B
OP
) in
e
the presence of a sufficiently strong South pole
magnetic field facing the marked side of the pack-
age. Similarly, the output will be switched off (B
RP
)
in the presence of a weaker South field and remain
off with 鈥?鈥?field. The SOT-23 device is reversed
from the UA package. The SOT-23 output transis-
tor will be switched on (B
OP
) in the presence of a
sufficiently strong North pole magnetic field sub-
jected to the marked face.
V
DD
Output
Voltage
Regulator
Chopper
GND
UA Package
Pin 1 - V
D D
Pin 2 - GND
Pin 3 - Output
SO Package
Pin 1 - V
D D
Pin 2 - Output
Pin 3 - GND
Note:
This is a static-sensitive device; please observe ESD precau -
tions. Reverse V
DD
protection is not included. For reverse voltage
protection, a 100鈩esistor in series with V
DD
is recommended.
US5881 CMOS Multi-Purpose Switch
3901005881 Rev 5.0
24/July/01
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