US5781LSE Melexis Inc, US5781LSE Datasheet - Page 5

• 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

Activation - Using Hall-Effect Switches
A switch requires a Hall IC, a magnet and a means of moving the magnet or the magnetic field. Figures 2, 3
and 4 show several ways by which a magnet can control the Hall IC switch. The following examples are simi-
lar in principle to most real applications. Slide-by, proximity and interrupt configurations represent the three
basic mechanical configurations for moving the magnet in relation to the Hall IC.
Slide-by Switch
In the Slide-by configuration, the motion of the magnet changes the field from North to South within a small
range of motion. This configuration provides a well defined position and switching relationship. The minimum
required motion may be as little as 1 or 2 mm.
Figure 2, Slide-by Switch
In Figure 2A, the South magnetic pole is too far away, so the switch stays OFF. In Figure 2B, the South
magnetic pole turns the switch ON.
-100
8 0 0
7 0 0
6 0 0
5 0 0
4 0 0
3 0 0
2 0 0
1 0 0
0
0
Linear Slide-By, Alnico8
50
Distance in mils (thousandths of an inch)
1 0 0
N
1 5 0
Linear Slide-By
S
2 0 0
c
2 5 0
A-03
3 0 0
Figure 2A
3 5 0
3-3
.050" Airgap
.125" Airgap
.250" airgap
Section 3 - Applications
N
S
A-04
Figure 2B