Description
These Broadcom® devices are very low power consumption, high-gain, single- and dual-channel optocouplers. The HCPL-4701 represents the single-channel, 8-pin DIP configuration and is pin compatible with the industry-standard 6N139. The HCPL-4731 represents the dual-channel 8-pin DIP configuration and is pin compatible with the popular standard HCPL-2731. The HCPL-070A and HCPL-073A are the equivalent single- and dual-channel products in an SO-8 footprint. Each channel can be driven with an input current as low as 40 μA and has a typical current transfer ratio of 3500%.
These high-gain couplers use an AlGaAs LED and an integrated high-gain photodetector to provide an extremely high current transfer ratio between input and output. Separate pins for the photodiode and output stage results in TTL compatible saturation voltages and high-speed operation. Where desired, the VCC and VO terminals can be tied together to achieve conventional Darlington operation (single-channel package only).
These devices are designed for use in CMOS, LSTTL, or other low power applications. They are especially well suited for ISDN telephone interface and battery-operated applications due to the low power consumption. A 700% minimum current transfer ratio is guaranteed from 0°C to 70°C operating temperature range at 40 μA of LED current and VCC ≥ 3V.
The SO-8 does not require through holes in a PCB. This package occupies approximately one-third the footprint area of the standard dual-in-line package. The lead profile is designed to be compatible with standard surface-mount processes.

Features
 Ultra low input current capability: 40 μA
 Specified for 3V operation
– Typical power consumption: <1 mW
– Input power: <50 μW
– Output power: <500 μW
 Will operate with VCC as low as 1.6V
 High current transfer ratio: 3500% at IF = 40 μA
 TTL and CMOS compatible output
 Specified ac and dc performance over temperature:
0°C to 70°C
 Safety approval
– UL recognized: 3750 Vrms for 1 minute and 5000 Vrms
for 1 minute per UL1577
– CSA approved
– IEC/EN/DIN EN 60747-5-5 approved with
VIORM = 630V peak
(Option 060) for HCPL-4701
 8-pin product compatible with 6N138/6N139 and
HCPL-2730/HCPL-2731
 Available in 8-pin DIP and SOIC-8 footprint
 Through-hole and surface-mount assembly available
Applications
 Battery-operated applications
 ISDN telephone interface
 Ground isolation between logic families – TTL, LSTTL,
CMOS, HCMOS, HL-CMOS, LV-HCMOS
 Low input current line receiver
 EIA RS-232C line receiver
 Telephone ring detector
 AC line voltage status indicator – low input power
dissipation
 Low power systems – ground isolation
 Portable system I/O interface