What the 1 MHz data rate and 4 µs propagation mean on your bench
The H11L1M is a single-channel optoisolator with an open-collector output, rated for 1 MHz data rate. The 100 ns typical rise and fall times mean the output edges are clean enough to clock a 5 V logic input without extra schmitt-trigger buffering, as long as the pull-up resistor is sized for the 50 mA sink capability. Propagation delay is 4 µs max in both directions — that is the time from LED drive to output transition. For a 1 MHz square wave, the 4 µs delay is about 0.4% of the period, so it won't cause timing closure issues in most sensor feedback or isolated serial links.
Isolation voltage and temperature range — where it fits
Rated for 4170 Vrms isolation, this part provides galvanic isolation between a low-voltage control side and a higher-voltage or noisy field side.
Through-hole DIP — hand-solderable and breadboard-friendly
It fits directly into a solderless breadboard or perfboard, and the 2.54 mm pin pitch is easy to hand-solder without magnification. Supplied in a tube, the H11L1M is a single-channel device with one input LED on side 1 and the photodetector on side 2. The DC input type means it responds to a steady forward current, not an AC signal.
Active production and compliance documentation
The base product number is H11L1, which means the 'M' suffix indicates the tube packaging variant. onsemi provides datasheets with full electrical characteristics, isolation test waveforms, and application notes for this optoisolator family.