Lhi 778 PIR Sensor for Automatic Light Switch

• Customization: Available
• Function Type: Infrared Range and Communication System
• Detection Type: Heat Detectors
• Model NO.: LHI778
• Output Signal Type: Digital Type
• Production Process: SemiConductor Integrated
• Material: Si+ Matel
• IP Rating: IP20
• Certification: CE
• Customized: Customized
• Model: PIR 200b
• Encapsulation: to-5
• Element Size: 2.0mm *1.0mm*1.0mm
• Element Type: Dual
• Window Material: Si
• Window Size: 3*4mm
• Pass Band: 7-14 Micrometer
• Operating Temperature: -30 Degree - +80degree
• Sensitivity: 4000V/W
• Operating Voltage: 3-15V
• Transport Package: Tray
• Specification: CE, RoHs
• Trademark: HW
• Origin: Guangdong, China
• HS Code: 9031499090
• Production Capacity: 100, 000, 000

Product Description

LHi 778 PIR Sensor for Automatic Light Switch


Specifaction

Model	LHi 778
Encapsulation	TO-5
Element Size/Type	2.0mm ×1.0mm ×Gap 1mm   Dual
Window Material	Si
Window Thickness	0.5mm
Window Size	3x4mm
Pass Band	7-14μm
Transmittance	>72%
Signal [Vp-p]	>2.2V
	1. Blackbody temperature 420K( 147˚C)  2. Modulation frequency 1HZ 3. Magnification 72.5 dB
Sensitivity	4000V/W
Detectivity	1.5×108cmHz1/2/W
Noise(Vp-p)	<200mV
	(mVp-p) (25ºC)
Balance	<15%
Operating Voltage	2-15V
Operating Current	8.5-24μA
	(VD=10V,Rs=47kΩ,25ºC)
Source Voltage	0.4-1.1V
	(VD=10V,Rs=47kΩ,25ºC)
Operating Temperature	-40ºC- +80ºC
Storage Temperature	-40ºC- +80ºC
Field of View	139°×139°

Working Principle 
Pyroelectric infrared sensor would change charge when radiant energy changes. The effect can be used in detecting the change of infrared radiant.The sensors apply to human motion detector,passive infrared burglar alarm and automatic light switch. Based on the same theory, the pyroelectric infrared sensor applies to gas detection with infrared absorption.

The LHi 778 pyroelectric infrared-detector series are the standard dual element design recommended for all variants of motion control. They include a dual element pyro-electric ceramic element with Fet in source follower connection.

LHi 778 detector is available in TO-5 housing with standard infrared filter.  It provides high responsivity  with excellent common mode performance (match) and  low noise at steady state and temperature changes..

Feature
1. Low noise, high detection
2. Excellent common mode balance- dual elements
3. To-39, To-5 encapsulation
4. Apply to both narrow and broad band filters
5. Signal channel or double channels pattern
6. Dual pattern apply to burglar alarm

Typical  Application 
1. Passive infrared burglar alarm: strong anti-interference for strong with light and electromagnetic radiation
2. Human motion detector 
3. Human motion detector of ceiling 
4. Gas analysis
5. Non-contact infrared measurement