- 1 - Letex Technology Corp.
Photocoupler
Part Name: LA214
Features
SOP package 4 Pin type in miniature design
600% minimum current transfer ratio
1500V rms Input/Output isolation
AC input.
Applications
Telephones
Programmable controllers
System appliances, measuring instruments.
Signal transmission between circuits of different potentials and impedances.
Dimensions
(Unit: mm
inch
)
1. LED Anode, Cathode
2. LED Cathode, Anode
3. Emitter
4. Collector
2
1
16
A
LA214
3
4
Letex
1
2
3
4
- 2 - Letex Technology Corp.
Photocoupler
Part Name: LA214
Absolute Maximum Ratings
(Ambient Temperature: 25)
Item
Symbol
Rating
Units
Note
Forward Current
I
F
50
mA
Reverse Voltage
V
R
5
V
Input
Peak Forward Current
I
FP
1
A
Collector to Emitter Voltage
Vceo
40
V
Ic=1mA, I
B
=0
Emitter to Collector Voltage
Veco
6
V
I
E
=100A, I
B
=0
Collector Current
Ic
50
mA
Output
Power Dissipation
Pc
150
mW
I/O Breakdown Voltage
V
I/O
1500
Vrms
RH=60%, 1min
Power Dissipation
P
D
200
mW
Storage Temperature
Tstg
-55 to +125
Operating Temperature
Top
-55 to +100
Soldering Temperature
T
Sol
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
Reverse Current
I
R
-
A
Input
Junction Capacitance
Ct
30
pF
V=0, f=1.0KHz
C-E Breakdown Voltage
Vceo
35
V
Ic=0.5mA
E-C Breakdown Voltage
Veco
6
V
Ie=0.1mA
Output
Collector Dark Current
Iceo
100
nA
Vce=20V, I
F
=0
Current Transfer Ratio
CTR
600
1600
7000
I
F
=
1mA, Vce=5V
Collector Saturation Voltage
Vce(sat)
1
V
I
F
=
20mA, Ic=1mA
Isolation Resistance
R
I/O
10
9
V=500V DC
Isolation Capacitance
C
I/O
1.0
pF
V=0, f=1.0MHz
Rise Time
t
r
300
s
Vce=5V, Ic=2mA,
Coupled
Fall Time
t
f
250
s
RL=100
- 3 - Letex Technology Corp.
Photocoupler
Reference Data
10
0.2
0
0
C
o
l
l
e
c
t
o
r
-
E
m
i
t
t
e
r
s
a
t
u
r
e
a
t
i
o
n
v
o
l
t
a
g
e
(
V
)
0.4
0.6
0.8
Forward current (mA)
20
30
40
50
60
Collector-Emitter saturation voltage Vs.
Forward current
1.0
1.2
Test circuit for resopnse time
F
o
r
w
a
r
d
c
u
r
r
e
n
t
(
m
A
)
Forward voltage (V)
-25
0
Forward current Vs.
Forward voltage
Ambient temperature (
)
75
50
-25
0
Ambient temperature (
)
75
50
100
Forward current Vs.
Ambient temperature
F
o
r
w
a
r
d
c
u
r
r
e
n
t
(
m
A
)
10
20
30
40
50
60
Collector power dissipation Vs.
Ambient temperature
150
Co
l
l
e
c
t
o
r
p
o
w
e
r
d
i
s
s
i
p
a
t
i
o
n
(
m
W
)
50
100
0
25
100
125
0
25
125
Peak forward current Vs.
Duty ratio
Duty ratio
P
e
a
k
fo
r
w
a
r
d
c
u
r
r
e
n
t
(
m
A
)
10
20
50
100
200
500
1000
2000
5 10 2
5
5
2
5
2
-3
-2
10
-1
10
0
10
3.0
2.5
1.0
0.5
1.5
2.0
1
10
50
200
0
Pulse width 100us
Ta = 25
2
5
100
500
20
25
0
25
50
Ta = 75
C
T
R
(
%
)
Forward current (mA)
1
1
Current transfer ratio Vs.
Forward current
2
5
10
20
50
20
40
60
80
100
120
140
160
180
200
Vce = 5V
Ta = 25
0
0
C
o
l
l
e
c
t
o
r
c
u
r
r
e
n
t
(
m
A
)
Collector-Emitter voltage (V)
Collector current Vs.
Collector-Emitter voltage
Ta = 25
1
2
3
4
5
6
7
8
9
5
10
15
20
25
30
I
F
= 30mA
20mA
10mA
5mA
Pc(Max)
R
e
l
a
t
i
v
e
C
T
R
(
%
)
Ambient temperature (
)
-25
0
0
25
100
50
75
Relative CTR Vs.
Ambient temperature
50
100
150
I
F
= 5mA
Vce = 5V
Co
l
l
e
c
t
o
r
-
E
m
i
t
t
e
r
s
a
t
u
r
a
t
i
o
n
vo
l
t
a
g
e
(
V
)
Ambient temperature (
)
-25
0
0
25
100
50
75
Collector-Emitter saturation voltage Vs.
Ambient temperature
I
F
= 20mA
Ic = 1mA
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
Vce = 20V
Collector dark current Vs.
Ambient temperature
C
o
l
l
e
c
t
o
r
d
a
r
k
c
u
r
r
e
n
t
(
A
)
Ambient temperature (
)
-11
10
-10
10
-9
10
-8
10
-7
10
-6
10
-5
10
0
25
50
75
100
-25
7
mA
5
mA
3
mA
1
mA
I
c
=
0
.5
m
A
Ta = 25
R
e
s
p
o
n
s
e
t
i
m
e
(
s
)
Load resistance (k
)
0.1
Response time Vs.
Load resistance
Vce = 2V
Ic = 2mA
Ta = 25
0.1 0.2 0.5 1 2
5
10
0.2
0.5
1
2
5
10
20
50
100
200
500
Vcc
R
L
Output
R
D
Input
10%
Input
Output
90%
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