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US1881 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers

Part No. US1881
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Maker  ETC1 [List of Unclassifed Manufacturers]

US1881 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers

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Rev. 014
Features and Benefits
Chopper stabilized amplifier stage
Optimized for brushless DC motor applications
Miniature high reliability package
Operation down to 3.5V
CMOS for optimum stability, quality and cost
Low power consumption
Ordering Information
Part No.
Temperature Suffix
E (-40°C to 85°C)
K (-40°C to 125°C)
L (-40°C to 150°C)
Package Code
SO (SOT-23) or UA(TO-92)
SO (SOT-23) or UA(TO-92)
SO (SOT-23) or UA(TO-92)
Solid state switch
Brushless DC motor commutation
Speed Sensing
Linear position sensing
Angular position sensing
Current sensing
UA Package:
Pin1: VDD - supply
Pin2: GND - Ground
Pin3: OUT - Output
SO Package:
Pin1: VDD - supply
Pin2: OUT – Output
Pin3: GND - Ground
1 Functional Diagram
Note: Static electricity sensitive device; please observe
ESD precautions. Reverse voltage protection is not in-
cluded. For reverse polarity protection, a 100Ohm resistor
in series with VDD is recommended.
2 Description
The US1881 is the industry’s first Hall integrated circuit in SOT-23 package. The US1881 is a bipolar Hall effect
sensor IC based on mixed signal CMOS technology. It incorporates advanced chopper stabilization techniques to
provide accurate and stable magnetic switch points. There are many applications for this HED in addition to those
listed above. The design, specifications and performance have been optimized for commutation applications in 5V
and 12V brushless DC motors.
In UA packaged device the output transistor will be latched on (Bop) in presence of a sufficiently strong South
pole magnetic field facing the marked side of the package. Similarly, the output will be latched off (Brp) in the
presence of a North field. The SOT-23 device behaviour is reverse to the UA device. The SOT-23 output transistor will
be latched on (BOP) in the presence of a sufficiently strong North pole magnetic field on the marked side

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