5/7/03
4N25 4N26 4N27 4N28 4N35 4N36
4N37 H11A1 H11A2 H11A3 H11A4 H11A5
GENERAL PURPOSE 6-PIN
PHOTOTRANSISTOR OPTOCOUPLERS
Page 6 of 15
© 2003 Fairchild Semiconductor Corporation
TYPICAL PERFORMANCE CURVES
Fig.3 Normalized CTR vs. Forward Current
(Black Package)
Fig.4 Normalized CTR vs. Forward Current
(White Package)
I
F
- FORWARD CURRENT (mA) I
F
- FORWARD CURRENT (mA)
0 5 10 15 20
N
O
R
M
A
L
IZ
E
D
C
T
R
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
V
CE
= 5.0V
T
A
= 25°C
0 2 4 6 8 10 12 14 16 18 20
N
O
R
M
A
L
IZ
E
D
C
T
R
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
V
CE
= 5.0V
T
A
= 25°C
Normalized to
I
F
= 10 mA
Fig. 5 Normalized CTR vs. Ambient Temperature
(Black Package)
Fig. 6 Normalized CTR vs. Ambient Temperature
(White Package)
-75 -50 -25 0 25 50 75 100 125
N
O
R
M
A
L
IZ
E
D
C
T
R
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Normalized to
I
F
= 10 mA
T
A
= 25°C
I
F
= 10 mA
I
F
= 20 mA
T
A
- AMBIENT TEMPERATURE (°C) T
A
- AMBIENT TEMPERATURE (°C)
-60 -40 -20 0 20 40 60 80 100
N
O
R
M
A
L
IZ
E
D
C
T
R
0.2
0.4
0.6
0.8
1.0
1.2
1.4
I
F
= 5 mA
I
F
= 5 mA
I
F
= 10 mA
I
F
= 20 mA
Normalized to
I
F
= 10 mA
T
A
= 25°C
Normalized to
I
F
= 10 mA
I
F
- LED FORWARD CURRENT (mA)
V
F
- FORWARD VOLTAGE (V)
Fig. 2 LED Forward Voltage vs. Forward Current
(White Package)
1 10 100
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
T
A
= 25°C
T
A
= -55°C
T
A
= 100°C
I
F
- LED FORWARD CURRENT (mA)
V
F
- FORWARD VOLTAGE (V)
Fig. 1 LED Forward Voltage vs. Forward Current
(Black Package)
1 10 100
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
T
A
= 25°C
T
A
= -55°C
T
A
= 100°C
