©2005 Fairchild Semiconductor Corporation

1

www.fairchildsemi.com

July 2005

Single-Channel: 6N138, 6N139 Dual-Channel: HCPL-2730, HCPL-2731 Rev. 1.0.0

Single-Channel: 6N138, 6N139 Dual-Channel: HCPL-2730, HCPL-2731 Low Input Current High Gain Split Darlington Optocouplers

Single-Channel: 6N138, 6N139
Dual-Channel: HCPL-2730, HCPL-2731
Low Input Current High Gain Split
Darlington Optocouplers

Features

■

Low current - 0.5 mA

■

Superior CTR-2000%

■

Superior CMR-10 kV/µs

■

CTR guaranteed 0-70°C

■

U.L. recognized (File # E90700)

■

VDE recognized (File # 120915) Ordering option
V, e.g., 6N138V

■

Dual Channel - HCPL-2730

■

HCPL-2731

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

Description

The 6N138/9 and HCPL-2730/HCPL-2731 optocouplers consist
of an AlGaAs LED optically coupled to a high gain split darling-
ton photodetector.
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.
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.

PackageSchematic
8
8
1
8
1
1
1
2
3
4 5
6
7
8
+
_
V
F
V
CC
V
B
V
O
GND
6N138 / 6N139
N/C
N/C
1
2
3
4 5
6
7
8+
_
V
F1
V
CC
V
01
V
02
GND
HCPL-2730 / HCPL-2731
V
F2
_
+