HCNW137-000E

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Optoisolators, commonly referred to as optocouplers, are devices that utilize a light-emitting diode (LED) and phototransistor to provide electrical isolation between two circuits. In the case of the HCNW137-000E, the device is a logic output optocoupler, which uses the LED/phototransistor combination to sense in the presence of either a high or low logic level voltage. In other words, this optocoupler will output its own logic level voltage based on the presence of an input logic level voltage.

HCNW137-000E optocouplers are in a 4-pin DIP package, with a 2.54mm spacing between pins. This allows the device to be easily incorporated into virtually any PCB layout. The electrical characteristics are such that the device employs an open-drain output connection to the signal chain, allowing for LED control logic with its own power source.

More specifically, the HCNW137-000E features an input logic threshold of 1.2V, (2.4V for TTL circuits) and a transistor output current of 0.35mA (@ 4.5V). Input power for the logic threshold is 5.5V with a maximum power consumption of 350mW. The maximum propagation delay of the device is 16us. As a logic output optocoupler, the device features a built-in logic level translator, allowing for 3.3V logic to be applied to a 5V logic signal train.

The working principle of the HCNW137-000E utilizes an input power source and either a TTL or CMOS logic level to control the LED, status, and output voltage. At power up, a logic high is applied to the input, causing the LED to be energized and the output to read a high logic level. Conversely, when a logic low is applied to the input, the LED is off and the output will read a low logic level.

The primary application for the HCNW137-000E is in the logic high/low level sensing and isolation of both 3.3V and 5V microcontrollers working at low power and low-speed. The device is well suited for switch sensing and state machine control in applications such as sensors, instrumentation, metering, and home automation.

The HCNW137-000E is a highly reliable and efficient logic output optoisolator designed to provide electrical isolation between two circuits, and it is well-suited for numerous applications. It features an open-drain output connection type, allowing for LED control logic with its own power source, as well as a built-in logic level translator, allowing for a logic level to be applied to a potentially different logic voltage. Furthermore, it features a maximum propagation delay of 16us, and a maximum power consumption of 350mW.

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