
6/6/02
Page 7 of 13
2002 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)
RBE- BASE RESISTANCE (k )
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
VCE= 0.3 V
IF = 5 mA
IF = 10 mA
IF = 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
IF = 20 mA
IF = 10 mA
IF = 5 mA
VCE= 0.3 V
Fig. 7 CTR vs. RBE (Unsaturated)
(Black Package)
Fig. 8 CTR vs. RBE (Unsaturated)
(White Package)
RBE- BASE RESISTANCE (k)
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
IF = 20 mA
IF = 10 mA
IF = 5 mA
VCE= 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
VCE= 5.0 V
IF = 20 mA
IF = 10 mA
IF = 5 mA
0.01
0.1
1
10
0.001
0.01
0.1
1
10
100
IF = 5 mA
IF = 20 mA
IF = 10 mA
Fig. 12 Collector-Emitter Saturation Voltage vs Collector Current
(White Package)
IC - COLLECTOR CURRENT (mA)
V
CE
(SA
T)
-
COLLECT
OR-EMITTER
SA
TURA
TION
V
O
LT
A
GE
(V)
IF = 2.5 mA
TA = 25C
Fig. 11 Collector-Emitter Saturation Voltage vs Collector Current
(Black Package)
IC - COLLECTOR CURRENT (mA)
V
CE
(SA
T)
-
COLLECT
OR-EMITTER
SA
TURA
TION
V
O
LT
A
GE
(V)
0.01
0.1
1
10
0.001
0.01
0.1
1
10
100
IF = 2.5 mA
TA = 25C
IF = 20 mA
IF = 10 mA
IF = 5 mA