14
PYROELECTRIC
DUAL ELEMENT
DETECTORS
FOR MOTION
SENSING
LHi 778, LHi 878, PYD 1388 – Low Cost Pyro
www.excelitas.com
PYROELECTRIC DETECTORS FOR MOTION SENSING
LHi 778, LHi 878, PYD 1388 – low cost Pyros
Parameter Symbol LHI 778
3.3
4.2
10
50
20
20
71°
71°
0.2 - 1.55
*
4.2
3.2 / 0.75
4 / 3
PYD 1388
3.3
4.2
10
50
20
20
95°
87°
0.2 - 1.55
**
**
4.2
3.2 / 0.75
4.6 / 3.4
LHI 878
3.3
4.2
10
50
20
20
95°
87°
0.2 - 1.55
**
*
4.2
3.2 / 0.75
4.6 / 3.4
kV/W
kV/W
%
µVpp
µVpp
107cm*√Hz/W
V
mm
mm
mm
Remark
LHi 778, LHi 878, PYD 1388 – Low Cost Pyro
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
Parameter Symbol
Rmin
Rtyp
Mmax
Nmax
Ntyp
D*
FoV
FoV
h
he / ho
X / Y
LHI 778
3.3
4.2
10
50
20
20
71°
71°
0.2 - 1.55
2.0 ... 12
*
4.2
3.2 / 0.75
4 / 3
PYD 1388
3.3
4.2
10
50
20
20
95°
87°
0.2 - 1.55
2.0 ... 12
**
**
4.2
3.2 / 0.75
4.6 / 3.4
LHI 878
3.3
4.2
10
50
20
20
95°
87°
0.2 - 1.55
2.0 ... 12
**
*
4.2
3.2 / 0.75
4.6 / 3.4
Unit
kV/W
kV/W
%
µVpp
µVpp
107 cm*√Hz/W
V
V
mm
mm
mm
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
* Improved, ** Excellent
Applications
• Auto light switch
• Wall switch
• Auto lamps
Features and Benefits
• TO-5 metal housing
• Different window sizes
• EMI protection for PYD1388
Product Description
is low cost Dual Element detector range oers standard TO-5 housings with dierent window
sizes. e LHi 778 has a smaller window for minimal cost. e PYD1388 has an additional EMI
protection option.
All dimensions in mm