Datasheet

Document Number: 83725 For technical questions, contact: [e-mail]
www.vishay.com
Rev. 1.5, 27-Feb-07 5
4N25/4N26/4N27/4N28
Optocoupler, Phototransistor Output,
with Base Connection
Vishay Semiconductors
Fig. 9 - Normalized Photocurrent vs. I
F
and Temperature
Fig. 10 - Normalized Non-Saturated HFE vs.
Base Current and Temperature
Fig. 11 - Normalized HFE vs. Base Current and Temperature
Fig. 12 - Propagation Delay vs. Collector Load Resistor
Fig. 13 - Switching Timing
Fig. 14 - Switching Schematic
i4n25_09
0.
0.01
1
1
10
I
F
- LED Current (mA)
Normalized Photocurrent
0.1 1 10 100
I
F
= 10 mA, T
A
= 25 °C
Nib, T
A
= - 20 °C
Normalized to:
Nib, T
A
= 20 °C
Nib, T
A
= 50 °C
Nib, T
A
= 70 °C
i4n25_10
0.4
0.6
1.0
1.2
Ib - Base Current (µA)
1101001000
I
B
= 20 µA, V
CE
= 10 V,
T
A
= 25 °C
25 °C
70 °C
- 20 °C
NHFE - Normalized HFE
0.8
Normalized to:
i4n25_11
0.0
0.5
1.0
1.5
25 °C
- 20 °C
50 °C
70 °C
NHFE(sat) - Normalized Saturated HFE
1 10 100 1000
V
CE
= 10 V, I
b
= 20 µA
T
A
= 25 °C
V
CE
= 0.4 V
Ib - 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
= 5.0 V
F = 10 kHz
DF = 50 %
R
L
V
O
I
F
= 10 mA