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PYROELECTRIC
DUAL ELEMENT
Pyroelectric detectors for motion Sensing
DETECTORS
FOR MOTION
SENSING
LHi 778, LHi 878, PYD 1388 – Low Cost Pyro
Applications
• Auto light switch
• Wall switch
• Auto lamps
Features and Benefits
• TO-5 metal housing
• Different window sizes
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.
• EMI protection for PYD1388
All dimensions in mm
LHi 778, LHi 878, PYD 1388 – Low
low cost
CostPyros
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
Symbol Symbol
LHI 778
Rmin 3.3
Rtyp 4.2
Mmax10
Nmax 50
Ntyp 20
D* 20
FoV 71°
FoV 71°
0.2 - 1.55
*
4.2
h3.2 / 0.75
he / ho4 / 3
X / Y
PYD
LHI 778
1388
LHI 878
PYD 1388
3.3
4.2
10
50
20
20
71°
95°
71°
87°
0.2 - 1.55
2.0 ... 12
**
*
**
3.3
3.3 3.3
kV/W
4.2
4.2 4.2
kV/W
10
10 10
%
50
50 50
µVpp
20
20 20
µVpp
20 20
107cm*√Hz/W 20
95°
95° 95°
87°
87° 87°
0.2 - 1.55
0.2 - 1.55
0.2 - 1.55