H11C4S

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H11C4S optoisolators are triac, silicon-controlled rectifier (SCR) output devices for use in commercial and industrial applications. The devices are ideal for provididing isolation between digital (TTL or CMOS) and AC line-powered circuits. The primary purpose of an optoisolator is to provide a high-impedance electrical barrier which blocks transient and high-frequency noise and voltage while allowing low-level signals to propagate freely.

H11C4S devices feature an integrated diac and triac, along with a gate transistor and phototransistor. It incorporates a four-pin configuration, which helps remove the sparks generated by switching functions and helps reduce the effects of cumulative noise. Furthermore, it supports six different logic thresholds, allowing for a variety of external triggered load applications.

A primary advantage of the H11C4S optoisolator is its ability to isolate AC line-powered circuits from a TTL or CMOS logic circuit. This isolation allows the TTL or CMOS circuits to protect themselves from potentially high, damaging voltages which could result from an AC line fault. In addition, the device allows for fully isolated control of AC switching functions, helping to reduce the noise generated by a number of controlled functions.

In operation, the H11C4S optoisolator begins when a logic signal is applied to its anode terminal. This logic signal is received and converted into a corresponding light signal by the built-in phototransistor. The diode then activates the gate of the triac, allowing the gate to become electrically conductive and enable current flow to the load.

The ability of the H11C4S optoisolator to maintain an isolated circuit makes it perfect for a variety of applications, including power switching, motor speed control, temperature control, external triggering, digital control, AC line monitoring, and AC line protection. The device is available in a variety of packages, allowing for easy integration and adaptation into many existing applications.

As a result of its exceptionally low input current, high output power capability, low power consumption, and wide operating temperature range, the H11C4S optoisolator is an excellent choice for a variety of AC line-powered control applications. Its ability to provide a low-impedance electrical barrier between TTL or CMOS logic and AC line-powered circuits helps reduce the effects of arising transient noise and voltage.

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