1
Reflective Photosensors (Photo Reflectors)
ON2175
Reflective Photosensor
Tape end sensor for DAT
Outline
ON2175 is a sensor which consists of a high efficiency GaAs
infrared light emitting diode and a high sensitivity Si phototransistor
which are arranged together in the same direction. It detects the
beginning and end of a tape based on changes in the amount of light
reflected from a prism which is situated outside of the sensor.
Features
Fast response
Small size and light weight
,,
,,,
,,
3.75
0.15
Unit : mm
Pin connection
8.3
0.3
6.0
0.15
2.2
0.3
(R2.3)
5.0
+0 0.3
6.5
0.3
8.3
0.3
5.0 min.
4.0
0.3
1.0
0.3
(C0.2)
3.0
0.3
8.0
7.0
0.3
+0
0.3
+0
0.3
4.0
0.3
2-1.2
0.15
(3.75)
(3.75)
2-0.4
0.2
1.2
+0.2
0.1
2-0.15
4
2
3
1
(4-R0.3)
2-1.2
0.15
(C0.3)
1
4
3
2
(Note) ( ) Dimension is reference
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,,
,
,,
,,,
,,
,,
,,,
,,
ON2175
prism
2.5
1
1
2 1.5
(Unit : mm )
,
,
,,
,,
(Input pulse)
(Output pulse)
t
d
: Delay time
t
r
: Rise time (Time required for the collector current to increase from
10% to 90% of its final value)
t
f
: Fall time (Time required for the collector current to decrease from
90% to 10% of its initial value)
Sig.OUT
10%
90%
t
d
t
r
t
f
50
R
L
V
CC
Sig.IN
Absolute Maximum Ratings
(Ta = 25C)
Parameter
Symbol Ratings
Unit
Input (Light
Reverse voltage (DC)
V
R
3
V
emitting diode)
Forward current (DC)
I
F
50
mA
Power dissipation
P
D
*1
75
mW
Collector current
I
C
20
mA
Output (Photo Collector to emitter voltage
V
CEO
30
V
transistor)
Emitter to collector voltage
V
ECO
5
V
Collector power dissipation
P
C
*2
100
mW
Temperature
Operating ambient temperature
T
opr
25 to +85
C
Storage temperature
T
stg
30 to +100
C
*1
Input power derating ratio is 1.0 mW/C at Ta
25C.
*2
Output power derating ratio is 1.34 mW/C at Ta
25C.
Electrical Characteristics
(Ta = 25C)
Parameter
Symbol
Conditions
min
typ
max
Unit
Input
Forward voltage (DC)
V
F
I
F
= 50mA
1.5
V
characteristics Reverse current (DC)
I
R
V
R
= 3V
10
A
Output characteristics Collector cutoff current
I
CEO
V
CE
= 10V
0.2
A
Transfer
Collector current
I
C
*1
V
CE
= 5V, I
F
= 20mA, R
L
= 100
30
A
characteristics
Response time
t
r
, t
f
*2
V
CC
= 10V, I
C
= 0.5mA, R
L
= 100
6
s
Collector to emitter saturation voltage V
CE(sat)
I
F
= 50mA, I
C
= 0.1mA
0.5
V
*1
I
C
Measurement method
*2
Switching time measurement circuit
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