HCPL-814-30AE

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Optoisolators are electrical devices which isolate two circuits electrically and optically. They are composed of an LED and a photosensor, usually a photodiode or phototransistor. By connecting the two terminals of a LED to an external power supply, a current flows through the LED and causes it to emit light. This light is detected by the photodiode, and a voltage appears across the photodiode terminals. This voltage across the photocell is used as a control signal in the isolated circuit. The HCPL-814-30AE is a type of optoisolator with a transistor, photovoltaic output.

The main application field of the HCPL-814-30AE is to provide superior performance for switching and interfacing applications in safety-critical systems. In particular, it is suitable for applications in the industrial control, telecommunications, medical, military and automotive industries. It also has good noise immunity and low power consumption, making it suitable for use in portable devices and battery-operated equipment.

The HCPL-814-30AE consists of a light emitting diode (LED) optically coupled to a photovoltaic transistor output. When the LED is illuminated by current, it emits infrared light, which is absorbed by the photovoltaic transistor. When the transistor absorbs the light, its base-emitter voltage rises, turning the transistor on. The logic levels of the optoisolator’s output can vary depending on the LED current. For the HCPL-814-30AE, the output state will be “high” when the LED current is greater than 5 mA, and “low” when the LED current is 0 mA.

The HCPL-814-30AE optoisolator has a very wide temperature range (-40°C to +100°C). The output current differs between logic levels, and its rating is 0.5 mA (Logic 0) and 1 mA (Logic 1). Its breakdown voltage is 30 V. That is a relatively high value, so the user may connect the output directly to the load, instead of using an external pull-up resistor. As for the optical side, it is rated 100 Ω, with a maximum of 120 Ω. The HCPL-814-30AE offers a very high isolation voltage of greater than 1000 Vrms (at 4kHz) and a response time of 70 µs (max).

The HCPL-814-30AE optoisolator is therefore suitable for a wide range of applications that require reliable signal isolation, such as in safety systems, telecommunications, industrial control, medical, military and automotive applications. It offers a lifetime of up to 10 billion operations, making it an excellent choice for cost-sensitive applications.

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