PYROELECTRIC
DUAL ELEMENT
pYroeleCtriC deteCtors For motion sensing
DETECTORS
FOR MOTION
SENSING
applications
• Auto light switch
• Wall switch
• Auto lamps
Features and Benefits
• TO-5 metal housing
• Different window sizes
• EMI protection for PYD1388
LHi 778, LHi 878, PYD 1388 – Low Cost Pyro
product description
This low cost Dual Element detector range offers standard TO-5 housings with different window
sizes. The LHi 778 has a smaller window for minimal cost. The PYD1388 has an additional EMI
protection option.
All dimensions in mm
LHi 778, LHi 878, PYD 1388 – low cost Pyros
Low cost 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 Symbol778
LHi
R
min
3.3
R
typ
4.2
M
max
10
N
max
50
N
typ
20
D* 20
FoV 71°
FoV 71°
0.2 - 1.55
*
4.2
h / 0.75
3.2
he / ho / 3
4
X/Y
PYD 778
LHi 1388
3.3
4.2
10
50
20
20
71°
95°
71°
87°
0.2 - 1.55
2.0** 12
...
*
**
4.2
3.24.2
/ 0.75
3.2 / /0.75
4.6 3.4
4/3
LHi 878 1388
PYD
LHi 878
Remark
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
3.3
3.3 3.3
kV/W
4.2
4.2 4.2
kV/W
10
10 10
%
50
50
50
µV
pp
20
20 20
µV
pp
20 20
107cm*√Hz/W 20
95°
95° 95°
87°
87° 87°
0.2
0.2 - 1.55
0.2 - 1.55 - 1.55
V
2.0 ... 12
** 2.0 ... 12
**
* **
*
4.2 **
mm
4.2
3.2 / 0.754.2
mm
3.2
4.6 / 3.4 / 0.75
mm 3.2 / 0.75
4.6 / 3.4
4.6 / 3.4
V
V
mm
mm
mm
14
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