DESCRIPTION
The HMHA281, HMHA2801 Series consists 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.
The HMHAA280 series consists of two gallium arsenide infrared emitting diodes, connected in inverse
parallel, driving a single silicon phototransistor in a compact 4-pin mini-flat package. The lead pitch is 1.27mm.

FEATURES
• Compact 4-pin package(2.4 mm maximum standoff height)
• Half pitch leads for optimum board space savings
• Current Transfer Ratio in selected groups
   HMHA2801: 80-600%
   HMHA2801A: 80-160%
   HMHA2801B: 50-150%
   HMHA2801C: 50-100%
   HMHA281: 50-600%
   HMHAA280: 50-600%
• Available in tape and reel quantities of 500 and 2500
• Applicable to Infrared Ray reflow (230°C Max, 30 seconds)
• BSI (File #8611/8612), CSA (File #1201524), UL (File #E90700) and VDE (File #136480) certified

APPLICATIONS
HMHAA280
• AC line monitor
• Unknown polarity DC sensor
• Telephone line receiver

HMHA281, HMHA2801 Series
• Digital logic inputs
• Microprocessor inputs
• Power supply monitor
• Twisted pair line receiver
• Telephone line receiver