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US5881
Unipolar Hall Switch - Low Sensitivity
Description
Applications
Documents
Environmental
FAQ
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Download US5881 Datasheet (PDF)
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US5881 General Description
The Melexis US5881 is a unipolar 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.
Thanks to its wide operating voltage range and extended choice of temperature range, it is suitable for use in automotive and solid state switch 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.
US5881 Features and Benefits
Wide operating voltage range from 3.5V to 24V
Low 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
US5881 Applications
Switches
Magnetic Interrupt Switch
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
US5881 Documentation
DataSheet
File Type
Size
Revision
Date
Action
MLX92211 DataSheet
PDF
768.4 KB
2
9/19/2011
US5881 DataSheet
PDF
440.9 KB
007
3/9/2006
How It Works
File Type
Size
Revision
Date
Action
The Hall Effect Switch
SWF
11.9 KB
002
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
US5881 Tools
US5881 Environmental Information
Environmental Information
File Type
Size
Revision
Date
Action
Green / Halogen Free Compliance Declaration US5881
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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US5881 In The Press
US5881 Frequently asked Questions
US5881 Pull Up
Question
I am using a US5881 Unipolar Hall Effect Sensor and a 10k pull up from Output to Vdd (+5V). This typically works well, however we have had a few that required a lower value resistor value. Is there a recommended pull up value that should be used?
Answer
The value of the pull-up resistor is limited only from the lower side - the output current should not to exceed the Absolute Maximum Rating (for US5881 it is 50mA ). The upper limit , if exists, comes from the application ( particularly the load resistance and capacitance). The pull-up together with the load resistance form a resistive divider which defines the HIGH logic level. This level should be appropriate to trigger the load. Example: If Rload=Rpull-up , then HIGH logic level is equal to VDD/2 . Be aware that the load capacitance together with the pull-up resistor influence the output rise and fall times. If you need a faster response decrease the value of the pull-up.
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