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US4881
Bipolar Hall Switch - Low Voltage & Very High Sensitivity
Description
Applications
Documents
Environmental
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Download US4881 Datasheet (PDF)
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US4881 General Description
The Melexis US4881 is a bipolar Hall-effect switch designed in mixed signal CMOS technology.
The device integrates a voltage regulator, Hall sensor with dynamic offset cancellation system, Schmitt trigger and an open-drain output driver, all in a single package.
The low operating voltage and extended choice of temperature range make it suitable for use in automotive, industrial and consumer low voltage applications.
The device is delivered in a Thin Small Outline Transistor (TSOT) for surface mount process and in a Plastic Single In Line (TO-92 flat) for through-hole mount.
Both 3-lead packages are RoHS compliant.
US4881 Features and Benefits
Operating voltage range from 2.2V to 18V
Very high magnetic sensitivity
CMOS technology
Chopper-stabilized amplifier stage
Low current consumption
Open drain output
Thin SOT23 3L and flat TO-92 3L both RoHS Compliant packages
SE package North Pole Active
UA package South Pole Active
US4881 Applications
Flow Meter
Application Note
File Type
Size
Revision
Date
Action
Hall Applications Guide
PDF
498.0 KB
10/25/2005
Soldering Application Note and Recommendations
PDF
137.7 KB
2.1
2/3/2009
Trim and form recommendations
PDF
127.1 KB
3.11
4/13/2009
US4881 Documentation
DataSheet
File Type
Size
Revision
Date
Action
MLX92211 DataSheet
PDF
768.4 KB
2
9/19/2011
US4881 DataSheet
PDF
459.3 KB
12
12/16/2010
How It Works
File Type
Size
Revision
Date
Action
The Hall Effect Latch
SWF
14.9 KB
002b
2/23/2007
Virtual Hall Effect Demoboard
SWF
164.0 KB
12/9/2002
What is the Hall Effect?
SWF
16.8 KB
1
3/15/2007
Reference
File Type
Size
Revision
Date
Action
BLDC Fan Motor Driver Quick Reference
PDF
1.7 MB
004
10/4/2011
Hall Effect Latch and Switch Quick Reference
PDF
669.1 KB
006
4/6/2012
US4881 Tools
US4881 Environmental Information
Environmental Information
File Type
Size
Revision
Date
Action
Green / Halogen Free Compliance Declaration US4881
PDF
39.7 KB
1.0
10/7/2009
Package Material Declaration - TSOT3 GR - S1
PDF
105.1 KB
7.0
1/25/2012
Package Material Declaration - UA GR - S3
PDF
97.2 KB
7.0
1/25/2012
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US4881 In The Press
US4881 Frequently asked Questions
Hall Effect Sensor IC
Answer
It looks like you are not using a pull up resistive load to 5 V. The US4881 has an open-drain output (low-side). It means you need to put a resistor to 5 V to get a 0 - 5 V logic signal out of the sensor. It should work right away. No need to put an amplifier. Otherwise, the part has been destroyed in a previous step but I guess you have tried multiple part w/ the same result. Note: what speed do you want to measure ? What is the RPM of the target and how many pole do you have on your magnet ?
US4881 bipolar hall switch
Question
Will it be possible to use the US4881 hall effect switch to sense the magnetic field surrounding a spark plug wire? I want to try using to sense the electical pulses when the spark plug (high side of ignition coil) fires (discharges)
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