Data Sheet

©2005 Fairchild Semiconductor Corporation www.fairchildsemi.com
4N25M, 4N26M, 4N27M, 4N28M, 4N35M, 4N36M, 4N37M Rev. 1.3 6
4N25M, 4N26M, 4N27M, 4N28M, 4N35M, 4N36M, 4N37M — 6-Pin General Purpose Phototransistor Optocouplers
Typical Performance Curves (Continued)
Switching Time Test Circuit and Waveforms
Figure 13. Switching Time Test Circuit and Waveforms
NORMALIZED t
on
- (t
on(R
BE
)
/ t
on(open)
)
Figure 10. Normalized t
on
vs. R
BE
R
BE
- BASE RESISTANCE (kΩ)
10 100 1000 10000 100000
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
V
CC =
10 V
I
C
= 2 mA
R
L
= 100 Ω
SWITCHING SPEED - (
μs)
Figure 9. Switching Speed vs. Load Resistor
R - LOAD RESISTOR (kΩ)
0.1 1 10 100
0.1
1
10
100
1000
T
off
I
F
= 10 mA
V
CC
= 10 V
T
A
= 25°C
T
r
T
on
T
f
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
V
CC =
10 V
I
C
= 2 mA
R
L
= 100 Ω
NORMALIZED t
off
- (t
off(R
BE
)
/ t
off(open)
)
10 100 1000 10000 100000
R
BE
- BASE RESISTANCE (kΩ)
Figure 11. Normalized t
off
vs. R
BE
Figure 12. Dark Current vs. Ambient Temperature
T
A
- AMBIENT TEMPERATURE (°C)
0 20 40 60 80 100
I
CEO
- COLLECTOR -EMITTER DARK CURRENT (nA)
0.001
0.01
0.1
1
10
100
1000
10000
V
CE
= 10 V
T
A
= 25° C
OUTPUT PULSE
INPUT PULSE
TEST CIRCUIT WAVE FORMS
t
r
t
f
INPUT
I
F
R
L
R
BE
V
CC
= 10 V
OUTPUT
t
on
10%
90%
t
off
I
C
Adjust
I
F to produce
I
C = 2 mA