Datasheet

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Document Number: 83725
136 Rev. 1.8, 07-Jan-10
4N25, 4N26, 4N27, 4N28
Vishay Semiconductors
Optocoupler, Phototransistor Output,
with Base Connection
Fig. 11 - Normalized h
FE
vs. Base Current and Temperature
Fig. 12 - Propagation Delay vs. Collector Load Resistor
Fig. 13 - Switching Timing
Fig. 14 - Switching Schematic
i4n25_11
0.0
0.5
1.0
1.5
25 °C
- 20 °C
50 °C
70 °C
Nh
FE(sat)
- Normalized Saturated h
FE
1 10 100 1000
V
CE
= 10 V, I
b
= 20 µA
T
A
= 25 °C
V
CE
= 0.4 V
I
b
- Base Current (µA)
Normalized to:
i4n25_12
1
10
100
1000
R
L
- Collector Load Resistor (kΩ)
t
PLH
- Propagation Delay (µs)
2.5
2.0
1.5
1.0
0.1 1 10 100
I
F
= 10 mA, T
A
= 25 °C
V
CC
= 5.0 V, V
th
= 1.5 V
t
PLH
t
PHL
t
PHL
- Propagation Delay (µs)
i4n25_13
I
F
t
R
= 1.5 V
V
O
t
D
t
S
t
F
t
PHL
t
PLH
V
TH
i4n25_14
V
CC
= 5 V
f = 10 kHz
DF = 50 %
R
L
V
O
I
F
= 10 mA