The 6N135M, 6N136M, HCPL4503M, HCPL2530M, and
HCPL2531M optocouplers consist of an AlGaAs LED
optically coupled to a high speed photodetector transistor for each channel.
A separate connection for the bias of the photodiode
improves the speed by several orders of magnitude over
conventional phototransistor optocouplers by reducing
the base-collector capacitance of the input transistor.
The HCPL4503M has no internal connection to the phototransistor base for improved noise immunity. An internal noise shield provides superior common mode
rejection of up to 50,000 V/μs
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