The HMHA281 is a 4-Pin Half-Pitch Mini-Flat Phototransistor Optocouplers The HMHA281 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
Current Transfer Ratio: HMHA281: 50% to 600%
Safety and Regulatory Approvals:
UL1577, 3,750 VACRMS for 1 Minute
DIN-EN/IEC60747-5-5, 565 V Peak Working Insulation Voltage