The HMHA281 and HMHA2801 series devices consist of a gallium arsenide infrared emitting diode driving a silicon phototransistor in a compact 4-pin mini-flat package. The lead pitch is 1.27 mm.
Compact 4−Pin Package: 2.4 mm Maximum Standoff Height Half−Pitch Leads for Optimum Board Space Savings These Devices are Pb−Free Applications AC-DC Merchant Power Supply Consumer Appliances Industrial Motor
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