--
1--
Letex Technology Corp.
Subminiature Photointerrupter
Model No: LBT-124
Features
Compact package based on the double-mold method.
High resolution (slit width = 0.4mm).
Gap between emitter and detector is 2.0mm.
Applications
Floppy disk drives
Printers
Cameras
Outline Dimensions (Unit: mm)
4
3
1
2
1 Anode
2 Cathode
3 Emitter
4 Collector
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2--
Letex Technology Corp.
Subminiature Photointerrupter
Model No: LBT-124
Absolute Maximum Ratings
(Ambient Temperature: 25)
Item
Symbol
Rating
Units
Note
Forward current
I
F
50
mA
Reverse voltage
V
R
5
V
Input
Power dissipation
P
D
75
mW
Collector-emitter voltage
V
ceo
30
V
Emitter-collector voltage
Veco
4.5
mA
Output
Collector power dissipation
P
C
80
mW
Storage Temperature
Tstg
-40 to +100
Operating Temperature
Top
-25 to +85
Soldering Temperature
Tsol
260
10 seconds max.
Electrical Specifications
(Ambient Temperature: 25)
Item
Symbol
Min.
Typ.
Max.
Units
Conditions
Forward voltage
V
F
1.2
1.4
V
I
F
=20mA
Peak forward voltage
V
FM
3
4
V
I
FM
=0.5A
Input
Reverse current
I
R
10
A
V
R
=5V
Collector dark current
Iceo
0.5
A
Vce=10V
Collector-emitter breakdown voltage
BVceo
30
V
Ice=50
A
Output
Emitter-collector breakdown voltage
BVeco
4.5
V
Iec=50
A
Collector current
Ic
0.5
mA
Vce=5V, I
F
=20mA
Collector-emitter saturation voltage
Vce(sat)
0.4
V
I
F
=20mA, Ic=0.3A
Combi
nation
Response time
Tr/tf
10
s
I
F
=5mA, Vcc=5V,
R
L
=100
--
3--
Letex Technology Corp.
Subminiature Photointerrupter
Reference Data
2
Relative collector current Vs.
Shield distance
I
F
= 20mA
Vce = 5V
Ta=25
Collector current Vs.
Forward current
Response time Vs.
Load resistance
Collector current Vs.
Ambient temperature
0.15
Re
la
t
i
v
e
co
l
le
c
t
o
r
cu
rre
n
t
(
%
)
C-
E
S
a
t
u
ra
t
i
o
n
v
o
lt
a
ge
(V
)
0.05
0
-25
0.10
Ambient temperature (
)
0
25
50
75
100
Shield distance (mm)
0
-2
0
-1
40
20
-2
2
1
0
-1
1
C-E Saturation voltage Vs.
Ambient temperature
0.25
0.20
0.30
Co
ll
e
c
t
o
r
c
u
rre
n
t
(u
A
)
-25
0
2
1
3
6
4
5
7
8
I
F
= 40mA
Ic=1mA
80
60
100
Ambient temperature (
)
25
0
75
50
100
I
F
= 20mA
Vce = 5V
t
r
Re
sp
o
n
se
t
im
e
(
s
)
0.2
Load resistance (k
)
0.2
0.03
0.1
0.05 0.1
2
1
0.5
t
d
2
1
0.5
10
5
t
s
50
20
10
5
500
200
100
Vce = 2V
Ic = 2mA
Ta = 25
t
f
Fo
rw
a
rd
c
u
r
re
n
t
(m
A
)
0
1
5
2
10
100
20
50
200
500
Co
ll
e
c
t
o
r
c
u
rre
n
t
(m
A
)
Forward voltage (V)
0.5
1.0
1.5
2.0
2.5
3.0
0
0
10
4
2
30
Forward current (mA)
20
40
25
25
Ta = 75
50
0
Forward current Vs.
Forward voltage
Vce = 5V
Ta = 25
8
6
12
10
60
20
Fo
rw
a
rd
c
u
r
re
n
t
(m
A
)
0
-30
10
40
30
50
Ambient temperature (
)
0
25
50
75
100
125
40
P
o
w
e
r
d
is
si
p
a
tio
n
(m
W
)
Ambient temperature (
)
0
-25
0
20
25
50
75
100
80
60
100
Forward current Vs.
Ambient temperature
Collector dark current Vs.
Ambient temperature
Vcc
Test circuit for resopnse time
R
D
Input
Output
Output
Input
R
L
90%
10%
25
Ambient temperature (
)
Co
ll
e
c
t
o
r
d
a
rk
c
u
rre
n
t
(A
)
-25
-11
10
0
-10
10
-9
10
-8
10
-7
10
-6
10
-5
10
50
100
75
Vce = 20V
20mA
Co
ll
e
c
t
o
r
c
u
rre
n
t
(m
A
)
IF=10mA
Collector-Emitter voltage (V)
50
0
1
0
3
2
4
2
4
6
5
7
9
8
10
Collector current Vs.
Collector-Emitter voltage
6
8
Ta = 25
10
12
40mA
30mA
50mA
10
-2
Duty ratio
100
P
e
a
k
f
o
r
w
a
r
d
cu
rre
n
t
(
m
A
)
125
10
10
5
-3
2
5
20
50
200
500
2000
1000
-1
2
10
5
5
2
10
0
Pulse width 100us
Ta = 25
Peak forward current Vs.
Duty ratio
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