July 2005
Single-Channel: 6N138, 6N139
Dual-Channel: HCPL-2730, HCPL-2731
Low Input Current High Gain Split
Darlington Optocouplers
Features
Description
■ Low current - 0.5 mA
The 6N138/9 and HCPL-2730/HCPL-2731 optocouplers consist
of an AlGaAs LED optically coupled to a high gain split darling-
ton photodetector.
■ Superior CTR-2000%
■ Superior CMR-10 kV/µs
■ CTR guaranteed 0-70°C
■ U.L. recognized (File # E90700)
The split darlington configuration separating the input photo-
diode and the first stage gain from the output transistor permits
lower output saturation voltage and higher speed operation than
possible with conventional darlington phototransistor optocou-
pler. In the dual channel devices, HCPL-2730/HCPL2731, an
integrated emitter - base resistor provides superior stability over
temperature.
■ VDE recognized (File # 120915) Ordering option
V, e.g., 6N138V
■ Dual Channel - HCPL-2730
■ HCPL-2731
The combination of a very low input current of 0.5 mA and a
high current transfer ratio of 2000% makes this family particu-
larly useful for input interface to MOS, CMOS, LSTTL and EIA
RS232C, while output compatibility is ensured to CMOS as well
as high fan-out TTL requirements. An internal noise shield pro-
vides exceptional common mode rejection of 10 kV/µs.
Applications
■ Digital logic ground isolation
■ Telephone ring detector
■ EIA-RS-232C line receiver
■ High common mode noise line receiver
■ µP bus isolation
■ Current loop receiver
Package
Schematic
VCC
N/C
1
8
VCC
+
1
8
VF1
_
8
VB
+
2
3
4
7
6
5
V01
2
3
7
6
5
VF
_
1
_
VO
V02
VF2
GND
N/C
GND
+
4
8
8
6N138 / 6N139
HCPL-2730 / HCPL-2731
1
1
©2005 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
Single-Channel: 6N138, 6N139 Dual-Channel: HCPL-2730, HCPL-2731 Rev. 1.0.0
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
