H11AA1TM

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Optoisolators, also called optocouplers, optical couplers, photo-couplers, opto-isolators, photocouplers, or optical isolators, are components that use light to electrically isolate points of an electrical circuit. In particular, a device known as the H11AA1TM, belonging to the Transistor, Photovoltaic Output type, is a photocoupler integrated circuit (IC) featuring a Gallium-Aluminum-Arsenide (GAAS) infrared LED and a two-channel have phototransistor output.

H11AA1TM’s main utility is providing an electronic gate between two circuits that isolates them electrically preventing interference, noise currents, or transients entering circuits of different power grounds. By physically separating the connection between two circuits, optoisolators can improve noise immunity, data integrity, and system lifetimes. Specifically, the H11AA1TM device is suitable for voice, data, and power signal isolation in fields such as communication equipment, office automation, industrial automation, security systems, and other applications where electrical isolation between power islands is required.

In terms of its operation principle, H11AA1TM works by emitting infrared light when activated by a current source connected to its anode and cathode pins. This light frequency is detected by its phototransistor output, which is typically connected to both a load resistor and the anode and cathode pins in order to replicate the input’s original signal. In this way, it transmits a signal without actually being connected to it, thus maintaining a high level of electrical isolation between the two circuits.

In terms of specifications, the H11AA1TM device delivers a high direct current transfer ratio (CTR) of 700% at 15mA. It features an insurer voltage rating of 12VDC and 6.6mA secure current rating, as well as a response time of no more than 1.0 ms and a propagation delay time of merely 0.5 ms. Furthermore, it includes over-current limitation that boosts system safety when connected to power sources, as well as a maximum supply voltage of 30 V DC, which offers easy connection that eliminates the need for zener diodes.

Last but not least, H11AA1TM comes in a 4-pin DIP (dual in-line package) configuration, providing 200mW input power capability and high isolation voltage of 5000 Vrms for 1 minute, ensuring no electric or magnetic connection between input and output circuits. This, in turn, maximizes performance and product reliability in harsh industrial environments and eliminates the use of optically-coupled components, thus drastically simplifying designs.

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