PYROELECTRIC
DUAL ELEMENT
pYroeleCtriC deteCtors For motion sensing
DETECTORS
FOR MOTION
SENSING
applications
• Auto light switch
• Wall switch
• Auto lamps with 180° FOV using 2 detectors
Features and Benefits
• TO-39 metal housing
• Different window sizes
• EMI protection option
LHi 874, LHi 944 – Low Profile Pyro
product description
These low profile TO-39 detectors are very well suited with two detectors arranged in one common
sensing unit for up to 180 degree view, with an EMI protection in LHi 944.
All dimensions in mm
LHi 874, LHi 944 – Low Profile Pyro
Parameter
Responsivity, min.
Responsivity, typ.
Match, max.
Noise, max.
Noise, typ.
Spec. detectivity
Field of view, horizontal
Field of view, vertical
Source voltage
Operating voltage
EMI performance
WLI
Height
Optical element location
Filter size
* Improved, ** Excellent
Symbol
R
min
R
typ
M
max
N
max
N
typ
D*
FoV
FoV
LHi 874
3.3
4.2
10
50
20
20
95°
87°
0.2-1.55
2.0 ... 12
**
*
3.2
2.2 / 0.75
4.6 / 3.4
LHi 944
3.3
4.2
10
50
20
20
110°
110°
0.2-1.55
2.0 ... 12
**
*
3.2
2.2 / 0.75
5.2 / 4.2
Unit
kV/W
kV/W
%
µV
pp
µV
pp
7
10 cm*√Hz/W
Remark
f = 1 Hz
f = 1 Hz
0.4…10 Hz / 20° C
0.4…10 Hz / 20° C
1 Hz / 1 Hz BW / 20° C
Unobstructed
Unobstructed
47 kΩ / 20° C / 5 V
47 kΩ / 20° C
Excelitas tester
V
V
h
he / ho
X/Y
mm
mm
mm
www.excelitas.com
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