Document
5mm DIP Ambient Light Sensor
ALS-PT243-3C/L177
Features
‧Close responsively to the human eye spectrum ‧Light to Current, analog output ‧Good output linearity across wide illumination range ‧Low sensitivity variation across various light sources ‧Operation temperature performance, -40oC to 85oC ‧Wide supply voltage range, 2.5V to 5.5V ‧Size : 5mm Lamp (Flat lens) ‧RoHS compliant and Pb Free package
Description
The ALS-PT243-3C/L177 is consisting of phototransistor in DIP package. EVERLIGHT ALS series product are a good effective solution to the power saving of display backlighting of mobile appliances, such as the mobile phones, NB and PDAs. Due to the high rejection ratio of infrared radiation, the spectral response of the ambient light sensor is close to human eyes.
Applications
‧Detection of ambient light to control display backlighting
Mobile devices – mobile phones, PDAs Computing device – TFT LCD monitor for Notebook computer Consumer device – TFT LCD TV, video camera, digital camera, toys
‧Automatic residential and commercial management ‧Automatic contrast enhancement for electronic signboard ‧Ambient light monitoring device for daylight and artificial light
– Street light, CCD/CCTV
Everlight Electronics Co., Ltd. Document No: DAS-024-007 Rev1.1
1
http:\\www.everlight.com Dec.31, 2007
5mm DIP Ambient Light Sensor
Package Dimensions
ALS-PT243-3C/L177
Emitter Collector
Notes: 1.All dimensions are in millimeters 2.Tolerances unless dimensions ±0.1mm
Everlight Electronics Co., Ltd. Document No: DAS-024-007 Rev1.1
2
http:\\www.everlight.com Dec.31, 2007
5mm DIP Ambient Light Sensor
ALS-PT243-3C/L177
Absolute Maximum Ratings (Ta=25℃)
Parameter
Symbol
Supply Voltage
[Note1]
Operating Temperature Range
Vcc Topr
Storage Temperature Range
Tstg
Soldering Temperature Range [Note1] Tsol
Rating -0.5~6.0 -40 ~ +85 -40 ~ +100
260 ± 10
Unit V °C °C °C
Note1: For detail reflow time and the recommended temperature profile, please refer to page 8.
Recommended Operating Conditions (Ta=25℃)
Parameter Operating Temperature Supply Voltage
Symbol Topr Vcc
Min. -40 2.5
Max. +85 5.5
Unit °C V
Rankings
Bin 1 2 3
Symbol IPH(ON)
Min 5 12 17
Max 12 17 23
Unit Test Condition
μA
VCE=5V Ee=100Lux
Everlight Electronics Co., Ltd. Document No: DAS-024-007 Rev1.1
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http:\\www.everlight.com Dec.31, 2007
5mm DIP Ambient Light Sensor
ALS-PT243-3C/L177
Electrical and Optical Characteristics (Ta=25℃)
Parameter Dark Current Collector-Emitter Saturation Voltage
Light Current
Photocurrent Ratio Saturation Output Voltage Peak Sensitivity Wavelength Sensitivity Wavelength Range
Rise time
Fall time
Angle of half Sensitivity
Symbol MIN TYP MAX.
ICEO VCE(sat)
--- ----- ---
0.1 0.4
IPH1 7 10
IPH2 200 230 IPH3 950 110
0 IPH3 / IPH2 --- 4.8
---------
Unit uA V uA uA uA ---
Vo 4.5 4.6 --- V
λp
--- 630 ---
nm
Test Condition VCE=10V, Ev= 0Lux
IC=2mA, Ev= 1000Lux
VCE=5V, Ev= 100Lux [Note1]
VCE=5V, Ev= 1000Lux [Note1]
VCE=5V, Ev= 1000Lux [Note2]
VCE=5V, Ev= 1000Lux
Vcc=5V, Ev= 1000Lux
RL=75K
[Note2]
λ 390 --- 700 nm
tr
--- 0.11 ---
ms
VCC = 5 V
RL = 7.5KΩ
tf
--- 0.22 ---
ms
2θ1/2
--- 143 --- Deg. IF = 20 mA
Note: 1. White Fluorescent light (Color Temperature = 6500K) is used as light source. However, White LED is
substituted in mass production. 2. Illuminance by CIE standard illuminant-A / 2856K, incandescent lamp.
Everlight Electronics Co., Ltd. Document No: DAS-024-007 Rev1.1
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http:\\www.everlight.com Dec.31, 2007
5mm DIP Ambient Light Sensor
ALS-PT243-3C/L177
Typical Electrical and Optical Characteristics Curves
Fig.1 Light Current vs. Illuminance
Fig.2 Output Voltage vs. Illuminance
10
Ta=25oC; Vcc=5V Flourescent Light incandescent Lamp
1
10 1
0.1
Ouput Voltage Vo (V)
Output Current (mA)
0.1
0.01 1
10 100 1000
Illuminance Ev (Lux)
10000
0.01 1E-3 1E-4
1
Ta=25oC ; Vcc=5V Fluorescent light RL=1KΩ Fluorescent light RL=7.5KΩ Fluorescent light RL=75KΩ
10 100 1000
Illuminance Ev (Lux)
10000
Fig.3 Spectral Response
Fig.4 Light current vs. Supply Voltage
Light current (uA)
30
EV = 100 Lux
25
20
15
10
5
0 012345678
Supply voltage (V)
Fig.5 Light Current vs. Temperature
Relative light current
1.3
Ev = 100 Lux
1.2
1.1
1.0
0.9
0.8
0.7
0.6 -40
-20
0 20 40
℃Temperature ( )
60
80 100
Fig.6 Dark Current vs. Temperature
Dark current (nA)
100000 10000
VCE = 7V EV = 0 Lux
1000
100
10
1
0.1
0.01
-60 -40 -20
0
20 40 60 80 100
℃Temperature ( )
Everlight Electronics Co., Ltd. Document No: DAS-024-007 Rev1.1
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http:\\www.everlight.com Dec.31, 2007
5mm DIP Ambient Light Sensor
Converting Photocurrent to Voltage
Vcc
ALS-PT243-3C/L177
Light Source
Iph Vout
RL CL
GND
Note:
1. The output voltage (Vout) is the product of photocurrent (IPH) and loading resistor (RL) 2. A right loading resistor shall be chosen to meet the requirement of maximum ambient light,
and output saturation voltage:
≦ = -Vout(max.) = Iout(max.) × RL Vout(saturation) Vcc 0.4V
Everli.