Photocoupler
Part Name: LA314
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])
8
7
6
5
8
7
6
5
Letex
LA314
16A
1
1
2
3
4
2
3
4
1,3.
2,4.
5,7.
6,8.
Anode,Cathode
Cathode, Anode
Emitter
Collector
General Tolerance:
±
0.1
Terminal Thickness: 0.15 [.006]
- 1 -
Letex Technology Corp.
Photocoupler
Part Name: LA314
Absolute Maximum Ratings
(Ambient Temperature: 25℃)
Item
Symbol
Rating
Forward Current
Input
Reverse Voltage
Peak Forward Current
Collector to Emitter Voltage
Emitter to Collector Voltage
Output
Collector Current
Power Dissipation
I/O Breakdown Voltage
Power Dissipation
Storage Temperature
Operating Temperature
Soldering Temperature
I
F
V
R
I
FP
Vceo
Veco
Ic
Pc
V
I/O
P
D
Tstg
Top
T
Sol
50
5
1
40
6
50
150
1500
200
-55 to +125
-55 to +100
260
Units
mA
V
A
V
V
mA
mW
Vrms
mW
℃
℃
℃
Note
Ic=1mA, I
B
=0
I
E
=100µA, I
B
=0
RH=60%, 1min
10 seconds max.
Electrical Specifications
(Ambient Temperature: 25℃)
Item
Symbol MIN. TYP.
Forward Voltage
Reverse Current
Junction Capacitance
C-E Breakdown Voltage
E-C Breakdown Voltage
Collector Dark Current
Current Transfer Ratio
Collector Saturation Voltage
Isolation Resistance
Isolation Capacitance
Rise Time
Fall Time
V
F
I
R
Ct
Vceo
Veco
Iceo
CTR
Vce(sat)
R
I/O
C
I/O
Input
MAX.
1.4
-
Units
V
µA
pF
V
V
nA
﹪
V
Ω
pF
µs
µs
Conditions
I
F
=
±
20mA
V=0, f=1.0KHz
Ic=0.5mA
Ie=0.1mA
Vce=20V, I
F
=0
I
F
=
±
1mA, Vce=5V
I
F
=
±
20mA, Ic=1mA
V=500V DC
V=0, f=1.0MHz
Vce=5V, Ic=2mA,
RL=100Ω
1.2
30
35
6
600
1600
Output
Coupled
100
7000
1
10
9
300
250
1.0
t
r
t
f
- 2 -
Letex Technology Corp.
Photocoupler
Reference Data
Forward current Vs.
Ambient temperature
60
Collector power dissipation Vs.
Ambient temperature
Collector power dissipation (mW)
Peak forward current Vs.
Duty ratio
50
2000
Peak forward current (
mA
)
150
1000
500
200
100
50
20
Pulse width 100us
Ta = 25℃
Forward current (mA)
40
30
100
20
50
10
0
-25
0
25
50
75
100
125
0
-25
0
25
50
75
100
125
10
5 10
-3
2
5 10
-2
2
5 10
-1
2
5 10
0
Ambient temperature (
℃
)
Ambient temperature (
℃
)
Duty ratio
Forward current Vs.
Forward voltage
500
200
Ta = 75℃
50℃
25℃
0℃
25℃
Current transfer ratio Vs.
Forward current
200
180
30
Collector current Vs.
Collector-Emitter voltage
I
F
= 30mA
25
Vce = 5V
Ta = 25℃
Ta = 25℃
20mA
Pc(Max)
100
50
140
120
Collector current (mA)
Forward current (mA)
160
20
CTR (%)
100
80
60
40
20
1
15
20
10
5
2
1
0
0.5
1.0
1.5
2.0
2.5
3.0
10mA
10
5mA
5
0
1
2
5
10
20
50
0
1
2
3
4
5
6
7
8
9
Forward voltage (V)
Forward current (mA)
Collector-Emitter voltage (V)
Relative CTR Vs.
Ambient temperature
150
Collector-Emitter saturation voltage Vs.
Ambient temperature
0.16
10
-5
Collector dark current Vs.
Ambient temperature
Vce = 20V
Collector-Emitter saturation voltage (V)
Collector dark current (A)
100
I
F
= 5mA
Vce = 5V
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
I
F
= 20mA
Ic = 1mA
10
-6
10
-7
10
-8
10
-9
10
-10
10
-11
Relative CTR ( %)
100
50
0
-25
0
25
50
75
100
-25
0
25
50
75
-25
0
25
50
75
100
Ambient temperature (
℃
)
Ambient temperature (
℃
)
Ambient temperature (
℃
)
Collector-Emitter saturation voltage Vs.
Forward current
1.2
Response time Vs.
Load resistance
Test circuit for resopnse time
Ta = 25℃
Ic=0.5mA
Collector-Emitter satureation voltage (V)
1.0
500
200
100
Vcc
Vce = 2V
Ic = 2mA
Ta = 25℃
Input
Input R
D
R
L
Output
Output
10%
90%
Response time (
μ
s)
30
40
50
60
0.8
50
20
10
5
2
1
0.5
0.2
3mA
0.6
0.4
0.2
0
0
10
20
1mA
5mA
7mA
0.1
0.1 0.2
0.5 1
2
5
10
Forward current (mA)
Load resistance (k
Ω
)
- 3 -
Letex Technology Corp.
