4N25/ 4N26/ 4N27/ 4N28
Vishay Semiconductors
NHFE(sat) - Normalized Saturated HFE
1.5
Normalized to:
Vce=10 V, Ib=20
µA
T A =25°C
F=10 KHz,
DF=50%
VCC = 5.0 V
70°C
1.0
25°C
–20°C
0.5
50°C
RL
VO
Vce=0.4 V
0.0
1
10
100
1000
i4n25_14
IF=1 0 mA
i4n25_11
Ib - Base Current -
µA
Figure 11. Normalized HFE vs. Base Current and Temp.
Figure 14. Switching Schematic
1000
tPLH - Propagation Delay -
µs
2.5
tPHL - Propagation Delay -
µs
IF =10 mA,TA=25°C
VCC =5.0 V, Vth=1.5 V
100
tPHL
2.0
10
tPLH
1.5
1
.1
i4n25_12
1.0
1
10
100
RL - Collector Load Resistor - kΩ
Figure 12. Propagation Delay vs. Collector Load Resistor
I
F
t
D
V
O
t
R
t
PLH
V
TH
=1.5 V
t
PHL
t
S
t
F
i4n25_13
Figure 13. Switching Timing
www.vishay.com
6
Document Number 83725
Rev. 1.4, 26-Jan-05
VISHAY [ VISHAY TELEFUNKEN ]
