The HMA121 series, HMA124, and HMA2701 series consist of a gallium arsenide infrared emitting diode driving a silicon phototransistor in a compact 4-pin mini-flat package. The lead pitch is 2.54 mm. The HMAA2705 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 2.54mm.
The HMA121, HMA124, HMA2701 series and HMAA2705 are gallium‑arsenide infrared emitting diode/phototransistor optocouplers packaged in a compact 4‑pin mini‑flat (2.54 mm pitch) format. They are used for digital logic inputs, microprocessor interfaces, power‑supply monitoring, telephone line receivers and AC line monitoring.
The datasheet provides absolute maximum ratings, electrical characteristics such as forward current, CTR ranges (50‑600 %), package dimensions, ordering options (tape‑and‑reel, VDE‑approved) and recommended reflow soldering profiles. Certification information (BSI, CSA, UL, VDE) is also listed.
| Lead pitch | 2.54 mm |
|---|---|
| Storage Temperature | -40 °C to +125 °C |
| Operating Temperature | -40 °C to +100 °C |
| Continuous Forward Current (Emitter) | 50 mA |
| Reverse Input Voltage | 6 V |
| Current Transfer Ratio (CTR) – HMA121 | 50‑600 % |
The lead pitch is 2.54 mm.
They can be stored from –40 °C up to +125 °C.
The HMA121 series has a current transfer ratio of 50‑600 %.