US5781LSE Melexis Inc, US5781LSE Datasheet - Page 10

• Manufacturer Part Number: US5781LSE
• Description: IC HALL EFFECT SWITCH TSOT-23
• Manufacturer: Melexis Inc
• Type: Unipolar Switchr

Specifications of US5781LSE

• Sensing Range: 15mT Trip, 3.5mT Release
• Voltage - Supply: 3.5 V ~ 24 V
• Current - Supply: 5mA
• Current - Output (max): 50mA
• Output Type: Digital, Open Drain
• Operating Temperature: -40°C ~ 150°C
• Package / Case: SOT-23
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Other names: US5781LSETR

Working With Magnetic Fields
How Do They Work?
A magnetic field will convert electrical energy to
mechanical energy, attract ferromagnetic objects
and serves as an input for Hall-Effect Sensors. A
magnetic field is described in terms of flux. Flux
lines are imaginary lines of magnetic force, orig-
inating at the North pole of a magnet and ending
at the South pole of the magnet. These lines rep-
resent the physical force exerted by the magnet.
When these magnetic flux lines pass through a
plate of semiconductor material, electrons are
forced to one side of the plate resulting in a volt-
age potential. This phenomenon is known as the
Hall-Effect.
Flux density is measured in units of Gauss or
milliTesla. The intensity of the magnetic field depends on many variables, such as cross-sectional area, length,
shape, material and ambient temperature. Each one of these variables must be considered when designing the
Hall Effect sensor integrated circuit and magnetic system for your application. The following section is intend-
ed to explain some fundementals which are useful in Hall Sensor designs and applications.
Figure 9, Magnetic Spectrum
.0000001
.000001
(Superconducting Quantum Interface Devices)
Signals
Bio
.0001
.001
SQUIDs
Fluxgate Magnetometer
.001
.01
Giant Magnetoresister
.01
.1
Earth's
Field
Magnetoresister
.1
1
Inductive Sensors
Rare Earth Magnets (Neo, SmCo)
Ceramic Magnets
Hall-Effect Sensors
Ferrite Magnets
10
1
Alnico Magnets
Nuclear Magnetic Resonance
Reed Switch
100
10
Figure 8, Flux Paths
100
1K
N
S
10K
1K
Strongest
Magnet
Electro
Flares
Solar
100K
10K
Gauss
milliTesla