Page 1
Technology Corp.
Photointerrupter
Model No: LBT-121
Features
˙Compact package based on the double-mold method.
˙High resolution (slit width = 0.5mm).
˙Gap between emitter and detector is 5.0mm.
Applications
˙Floppy disk drives
˙Printers
˙Cameras
Outline Dimensions (Unit: mm)
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Letex
Page 2
Technology Corp.
Photointerrupter
(Ambient Temperature: 25
V eco
Storage T emperature
T stg
Operating Temperature
Soldering Temperature
T sol
(Ambient Temperature: 25
V iew angle
Rise Time
Fall Time
Model No: LBT-121
Absolute Maximum Ratings
Forward current IF 50 mA
Reverse voltage VR 5 V
Input
Peak forward current IFP 1 A
Power dissipation Pd 75 mW
Collector current Ic 50 mA
Collector-Emitter voltage Vceo 30 V
Emitter-Collector voltage
Output
Collector power dissipation Pc 100 mW
Electrical Specifications
Input
Output
Light current Ic(on) 0.5 mA
Leakage current ILeak 1 µA
Speed
℃)
Item Symbol Rating Units Note
Tw=10μs,
t=10ms
5 V
℃
℃
℃
5 seconds max.
T op -25 to +85
-40 to +85
260
℃)
Item Symbol MIN. TYP. MAX. Units Conditions
Forward voltage VF 1.2 1.4 V
Reverse current IR 10 µA
Peak wavelength
λp
2θ1/2
940 nm
35 Deg.
Dark current Iceo 100 nA
C-E saturation voltage Vce(sat) 0.4 µA
tr
tf
5
5
IF=20mA
VR=5V
IF=20mA
Vce=20V
Ic=2mA, IB=0.1mA
Vce=5V
IF=20mA
Vce=5V
Ic=1mA
µs
RL=1KΩ
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Letex
Page 3
Technology Corp.
Photointerrupter
Reference Data
Relative collector current (
C-E Saturation voltage (V)
Shield distance (mm)
Power dissipation (mW)
Forward current Vs.
Ambient temperature
60
50
40
30
20
Forward current (mA)
10
0
-30
0 25 50 75 100 125
Ambient temperature (℃)
Forward current Vs.
Forward voltage
500
200
100
50
20
10
Forward current (mA)
5
2
1
Ta = 75℃
50℃
0
0.5 1.0 1.5 2.0 2.5 3.0
Forward voltage (V)
Peak forward current Vs.
Duty ratio
100
80
60
40
20
0
-25 0
25 50 75 100
Ambient temperature (℃)
25℃
0℃
25℃
Collector current Vs.
Forward current
12
Vce = 5V
Ta = 25℃
10
8
6
4
Collector current (mA)
2
0
0 10
Forward current (mA)
30
20 40
125
50
2000
1000
500
200
100
50
Peak forward current (mA)
20
10
-3
10 5
Collector current Vs.
Collector-Emitter voltage
12
Ta = 25℃
10
8
6
4
Collector current (mA)
2
0
1 0 3 2 4
Pulse width 100us
Ta = 25℃
-2
10
2 5
2 10 5 5 2 10
Duty ratio
50mA
30mA
20mA
IF=10mA
Collector-Emitter voltage (V)
-1
40mA
6 5 7 9 8 10
0
Collector current Vs.
Ambient temperature
8
7
6
5
4
3
Collector current (uA)
2
1
0
-25
Ambient temperature (℃)
C-E Saturation voltage Vs.
Ambient temperature
0.30
0.25
0.20
0.15
0.10
0.05
0
-25
0 25 50 75 100
IF = 20mA
Vce = 5V
25 0 75 50 100
Ambient temperature (℃)
IF = 40mA
Ic=1mA
Response time Vs.
Load resistance
500
Vce = 2V
200
Ic = 2mA
Ta = 25℃
100
50
20
10
5
2
Response time (μs)
1
0.5
0.2
0.1
100
80
%)
60
40
20
0
tf
tr
td
ts
0.2
0.03
0.05 0.1
Load resistance (kΩ )
Relative collector current Vs.
Shield distance
-2 0 -1
2 10.5 10 5
-2 2 1 0 -1 1
IF = 20mA
Vce = 5V
Ta=25°
Collector dark current Vs.
Ambient temperature
-5
10
-6
10
-7
10
-8
10
-9
10
Collector dark current (A)
-10
10
-11
10
-25
0
Ambient temperature (℃)
Vce = 20V
25
50 100 75
Test circuit for resopnse time
Vcc
RD
Input
2
Input
RL
Output
Output
10%
90%
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Letex
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