CNW138

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Optoisolators, also known as optocouplers, are electrical isolation elements that use light, usually from a light-emitting diode (LED), to couple two distinct circuits without the use of a direct electrical connection. This enables the two circuits to remain electrically and magnetically isolated, preventing electrical noise and sparks from propagating from one circuit to the other. One of the most commonly used optoisolator types is the Transistor, Photovoltaic Output (CNW138) optoisolator.

The CNW138 is a 4-pin optoisolator that consists of one infrared light diode coupled with a silicon planar phototransistor. Its compact surface-mount package makes it suitable for use in applications where space is limited. The CNW138 has an inner-lead pitch of 0.3 mm, which allows for a higher density placement of components on the board.

The CNW138 has an operating temperature ranging from -40°C to 85°C, and can withstand 230 V for 1 minute. It has an isolation voltage rating of 4 kV, and a collector-emitter maximum voltage rating of 30 V. The optoisolator supports DC and AC input loads, and is designed to handle currents up to 100 mA. It has a peak collector power dissipation of 250 mW. The CNW138 can be used to implement an isolation barrier between the input and output signals.

The CNW138 optoisolator has several advantages over other types of optoisolators. Its small size allows it to be used in high-density applications. It has an isolation voltage rating of 4 kV, which is higher than that of other optoisolators. Additionally, the CNW138 supports both AC and DC input signals, making it suitable for many types of applications. Furthermore, it has a low current consumption, which makes it energy efficient.

The working principle of the CNW138 optoisolator is based on the photovoltaic effect. When infrared light is incident on the LED of the optoisolator, the LED produces an electrical current, which is sent to the phototransistor. This current causes the base current of the phototransistor to increase, and consequently, its collector current increases. When the output voltage of the optoisolator increases, the voltage across the phototransistor decreases, and this induces a current in the phototransistor. This current is sent from the optoisolator’s collector terminal to its emitter terminal, thus completing the electrical connection.

The CNW138 optoisolator can be used in various applications such as for sensing and logic control signals, motor drives, switching power supplies, and systems where high-voltage isolation is required. It is also used for controlling current on AC or DC motors, switching relays, and converting digital logic signals from TTL or CMOS to low power signals.

In conclusion, the CNW138 Transistor, Photovoltaic Output optoisolator is a 4-pin device that provides electrical isolation between two circuits. It has a small size and supports both AC and DC input signals, making it suitable for high-density applications. The optoisolator features an isolation voltage rating of 4 kV and can handle a maximum current of 100 mA. It can be used in various applications such as for controlling circuits, switching relays, motor drives, and power supplies.

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