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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/s.
6N138 Maximum Ratings
Parameter
Symbol
Value
Units
Storage Temperature
TSTG
-55 to +125
°C
Operating Temperature
TOPR
-40 to +85
°C
Lead Solder Temperature (Wave solder only. See recommended reflow profile graph for SMD mounting)
TSOL
260 for 10 sec
°C
EMITTER
DC/Average Forward Input Current Each Channel
IF (avg)
20
mA
Peak Forward Input Current (50% duty cycle, 1 ms P.W.) Each Channel
IF (pk)
40
mA
Peak Transient Input Current - (1 s P.W., 300 pps)
IF (trans)
1.0
A
Reverse Input Voltage Each Channel
VR
5
V
Input Power Dissipation Each Channel
PD
35
mW
DETECTOR
Average Output Current Each Channel
IO (avg)
60
mA
Emitter-Base Reverse Voltage (6N138 and 6N139)
VER
0.5
V
Supply Voltage, Output Voltage
(6N138, HCPL-2730)
VCC , VO
-0.5 to 7
V
(6N139, HCPL-2731)
-0.5 to 18
Output Power Dissipation Each Channel
PO
100
mW
6N138 Features
Low current - 0.5 mA Superior CTR-2000% Superior CMR-10 kV/s 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
6N138 Typical Application
Digital logic ground isolation Telephone ring detector EIA-RS-232C line receiver High common mode noise line receiver P bus isolation Current loop receiver