These high-gain series couplers use a light-emitting diode 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 result in TTL-compatible saturation voltages and high-speed operation. Where desired the conventional photodarlington operation. A base access terminal allows a gain bandwidth adjustment to be made.
The 6N139, HCPL-0701, and CNW139 are for use in CMOS, LSTTL, or other low-power applications. A 400% minimum current transfer ratio is guaranteed over 0 to 70° C operating range for only 0.5 mA of LED current.
