US5781EUA Melexis Inc, US5781EUA Datasheet - Page 22
![IC HALL EFFECT SWITCH TO-92UA](/photos/19/49/194973/us5781eua_sml.jpg)
US5781EUA
Manufacturer Part Number
US5781EUA
Description
IC HALL EFFECT SWITCH TO-92UA
Manufacturer
Melexis Inc
Type
Unipolar Switchr
Specifications of US5781EUA
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 ~ 85°C
Package / Case
TO-92UA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Graph 2, Slide-by Method with Magnet A Steep Slope vs. Shallow Slope
Tolerances Build-up
The following examples incorporate many different factors in order to show how tolerance buildup can
affect a Hall Effect system. Air gap tolerance, temperature range, and the temperature coefficient of the
magnet will cause the activation distance of a US5881 EUA to vary, thus impacting switching accuracy.
Tolerances:
The US5880 Hall-Effect Switch has a maximum BOP of 250 Gauss and a minimum BRP of 140 Gauss.
If this part were to be actuated by sample Magnet B at an air gap of 3mm and 6mm, the following results
would occur (See Graphs 3 and 4). Each graph has an air gap tolerance of +1mm which could be due to
a loosely fitted mechanical assembly. Notice the difference in distance and slope between Graphs 3 and
4.
Graph 3, Slide-by With Magnet A, Shallow Slope
Section 3 - Applications
1000
800
600
400
200
1200
1000
0
800
600
400
200
Air gap Tolerance = 3mm. +1 mm. and 6mm. +1mm.
US5881EUA B OP /B RP Range = 95G min. B RP to 300G max. B OP
(IC Temperature Selection (EUA) = -40
Temperature Range = -40
Magnet Temp. Coefficient = -0.1098%/
0
0
2
Distance (mm)
4
1
6
2
8
3
Always "ON"
10
4
12
Always "OFF"
5
Distance (mm)
14
o
Air Gap = 5 mm
Air Gap = 6 mm
Air Gap = 7 mm
C to 85
6
16
7
18
o
C
8
20
o
o
9
C
C to 85
Air Gap = 2.5mm
Air Gap = 5mm
3-30
10
o
C)
Graph 2 shows what
happens to the slope of a
flux density vs. distance
graph by using different air
gaps with the same magnet
configuration.