Panasonic NaPiCa Operation Manual
Cadmium-free sensor
with spectral response
The Through-hole Type
for easy implementation as
a CdS cell replacement
Light Sensor (AMS3)
Light Sensor
“Through-hole Type”
FEATURES
1. Built-in optical filter for spectral
response similar to that of the human
eye.
Peak sensitivity wavelength is 580 nm
1.0
0.8
0.6
0.4
Relative sensitivity
1
Amplifier
1 Anode
2 Cathode
2
0.2
0
500 600
2. Photocurrent is proportional to
illumination. (linear output)
High photocurrent is achieved by built-in
photocurrent amp.
I
L = 260 µA (typical)
Ev = 100 lx (florescent light)
3. Uses environmentally friendly
silicon chips.
4. Lead-free.
5. Operates on 1.5 to 6 V DC, which is
suitable for battery operation.
6. Same through-hole shape as CdS
cell.
Human spectral
NaPiCa spectral
700 800 900 1000 1100400
Wavelength, nm
TYPICAL APPLICATIONS
1. Brightness detection for LCD
backlight control for LCD devices
(LCD TVs, car navigation systems,
etc.)
2. Brightness detection for circuits in
household lighting, crime
prevention lighting, and automatic
lighting for bicycle.
3. Brightness detection for wall clocks
(radio clocks).
4. Brightness detection for
surveillance cameras (night
switching).
TYPES
Photocurrent Part No. Packing quantity
260 µA* AMS302T 2,000pcs.
Note: Ev = 100 lx (Fluorescent lamp is used as light source)
Tape package is the standard packing style.
RATINGS
1. Absolute maximum ratings (Ambient temperature: 25°C 77°F)
Item
Reverse voltage V
Photocurrent I
Power dissipation P 40 mA —
Operating temperature T
Storage temperature T
2. Recommended operating condition
Item Symbol AMS302 Remarks
Reverse voltage
Minimum
Maximum 6 V
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Symbol AMS302 Remarks
R
L
opr
stg
V
R
–30 to +85°C –22 to +185°F Non-condensing at low temperatures
–40 to +100°C –40 to +176°F Non-condensing at low temperatures
–0.5 to 8 V —
5 mA —
1.5 V
Light Sensor NaPiCa Through-hole Type
ASCT1B295E ’05.2
Matsushita Electric Works, Ltd.
—
1
Light Sensor (AMS3)
3. Electrical characteristics (Ambient temperature: 25°C 77°F)
Item Symbol AMS302 Condition
Peak sensitivity wavelength —
Minimum
Photocurrent 1
Typical 13µA
Maximum 16.9µA
Minimum
Photocurrent 2
Typical 260µA
Maximum 338µA
Photocurrent 3 Typical I
Dark current
Switching time
Rise time Typical t
Fall time
Maximum I
Typical t
*1 Fluorescent lamp is used as light source. (Substituted with white LED for testing before shipping.)
*2 CIE standard illuminant ‘A’ is used as light source.
* Measuring method for switching time.
White LED
I
F
AMS302
R
L
V
5.0V
0
λ
p
580 nm —
9.1µA
I
L1
182µA
I
L2
L3
D
r
f
I
F
2.5V
V
0
500µAV
0.3µAV
8.5 ms
8.5 ms
90%
10%
tftr
VR = 5 V, EV = 5 lx
VR = 5 V, EV = 100 lx
R
= 5 V, EV = 100 lx
R
= 5 V
*1
*1
*2
VR = 2.5 V, VO = 2.5 V, RL = 5k
Ω
REFERENCE DATA
1. Power dissipation vs. ambient temperature
characteristics
50
40
30
20
Power dissipation, mW
10
0
0204060
Ambient temperature, °C
4. Photocurrent vs. brightness characteristics
Light source: Fluorescent lamp, CIE standard “A”
Reverse voltage: 5V, Ambient temperature: 25°C 77°F
10000
1000
Fluorescent lamp
CIE standard “A”
8085
100
2. Relative sensitivity vs. wavelength
characteristics
Ambient temperature: 25°C 77°F
1.0
0.8
0.6
0.4
Relative sensitivity
0.2
0
500 600
Human spectral
NaPiCa spectral
700 800 900 1000 1100400
Wavelength, nm
5. Relative photocurrent vs. ambient
temperature characteristics
Light source: Fluorescent lamp, Brightness: 100 lx
Reverse voltage: 5V
1.4
1.2
3. Dark current vs. ambient temperature
characteristics
Reverse voltage: 5V
10
1
0.1
Dark current, µA
0.01
0.001
40 60 1008020
Ambient temperature, °C
6. Relative photocurrent vs. reverse voltage
characteristics
Light source: Fluorescent lamp, Brightness: 100 lx
Ambient temperature: 25°C 77°F
1.2
1.0
0.8
100
Photocurrent, µA
10
1
10 100 1000010001
Brightness, lx
1.0
Relative photocurrent
0.8
0.6
0–20–40 20 40 60 80 100
Ambient temperature, °C
0.6
Relative photocurrent
0.4
0.2
0
3201 45678
Reverse voltage, V
2
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