Datasheet

5/7/03
Page 7 of 15
© 2003 Fairchild Semiconductor Corporation
GENERAL PURPOSE 6-PIN
PHOTOTRANSISTOR OPTOCOUPLERS
4N25 4N26 4N27 4N28 4N35 4N36
4N37 H11A1 H11A2 H11A3 H11A4 H11A5
Fig. 9 CTR vs. RBE (Saturated)
(Black Package)
Fig. 10 CTR vs. RBE (Saturated)
(White Package)
R
BE
- BASE RESISTANCE (k Ω) R
BE
- BASE RESISTANCE (k Ω)
NORMALIZED CTR ( CTR
RBE
/ CTR
RBE(OPEN)
)
NORMALIZED CTR ( CTR
RBE
/ CTR
RBE(OPEN)
)
10 100 1000
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
V
CE
= 0.3 V
I
F
= 5 mA
I
F
= 10 mA
I
F
= 20 mA
10 100 1000
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
I
F
= 20 mA
I
F
= 10 mA
I
F
= 5 mA
V
CE
= 0.3 V
Fig. 7 CTR vs. RBE (Unsaturated)
(Black Package)
Fig. 8 CTR vs. RBE (Unsaturated)
(White Package)
R
BE
- BASE RESISTANCE (kΩ) R
BE
- BASE RESISTANCE (kΩ)
NORMALIZED CTR ( CTR
RBE
/ CTR
RBE(OPEN)
)
NORMALIZED CTR ( CTR
RBE
/ CTR
RBE(OPEN)
)
10 100 1000
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
I
F
= 20 mA
I
F
= 10 mA
I
F
= 5 mA
V
CE
= 5.0 V
10 100 1000
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
V
CE
= 5.0 V
I
F
= 20 mA
I
F
= 10 mA
I
F
= 5 mA
0.01 0.1 1 10
0.001
0.01
0.1
1
10
100
I
F
= 5 mA
I
F
= 20 mA
I
F
= 10 mA
Fig. 12 Collector-Emitter Saturation Voltage vs Collector Current
(White Package)
I
C
- COLLECTOR CURRENT (mA)
V
CE (SAT)
- COLLECTOR-EMITTER SATURATION VOLTAGE (V)
I
F
= 2.5 mA
T
A
= 25 ˚C
Fig. 11 Collector-Emitter Saturation Voltage vs Collector Current
(Black Package)
I
C
- COLLECTOR CURRENT (mA)
V
CE (SAT)
- COLLECTOR-EMITTER SATURATION VOLTAGE (V)
0.01 0.1 1 10
0.001
0.01
0.1
1
10
100
I
F
= 2.5 mA
T
A
= 25 ˚C
I
F
= 20 mA
I
F
= 10 mA
I
F
= 5 mA