US5781 Datasheet, PDF (1/6 Pages) List of Unclassifed Manufacturers – CMOS High Sensitivity Switch

US5781
CMOS High Sensitivity Switch
Preliminary Datasheet
Features and Benefits
• Chopper stabilized amplifier stage
• New miniature package / thin, high reliability package
• Operation down to 3.5V
y • CMOS for optimum stability, quality, and cost
ar Applications
• Solid state switch
in _{• Limit switch}
• Current limit
lim ^{• Interrupter}
re ^{Ordering Information}
Part No.
Temperature Suffix
P ^US5781
E
Package
SO or UA
Temperature Range
-40°C to 85°C Extended
US5781
L
SO or UA
-40°C to 150°C Automotive
Functional Diagram
V_DD
Voltage
Regulator
Chopper
Output
UA Package
Pin 1 - V _{D D}
Pin 2 - GND
Pin 3 - Output
GND
SO Package
Pin 1 - V_{D D}
Pin 2 - Output
Pin 3 - GND
Description
The US5781 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 be switched on (B_OP) in
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 “0” 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.
Note: This is a static-sensitive device; please observe ESD precau -
tions. Reverse V_DD protection is not included. For reverse voltage
protection, a 100Ωresistor in series with V_DD is recommended.
US5781 CMOS High Sensitivity Switch
3901005781 Rev 1.7
7/23/01
Page 1