ON Semiconductor H21B4 Optical Interrupter Switch

The ON Semiconductor H21B4 is a versatile and reliable optical interrupter switch designed for a wide range of applications requiring non-contact object sensing. This component is part of ON Semiconductor's extensive portfolio of optoelectronic devices, known for their high performance and dependability.

The H21B4 features a gallium arsenide infrared LED and a silicon phototransistor, which are encapsulated in a black thermoplastic housing. The housing shields the internal components from external light interference, ensuring accurate operation. The phototransistor is positioned in such a way that it responds to the infrared light emitted by the LED only when an object interrupts the light beam.

Key Features:

• Non-Contact Sensing: The H21B4 enables the detection of objects without any physical contact, making it ideal for applications where wear and tear of traditional mechanical switches is a concern.
• High Resolution: This optical interrupter switch can detect small objects or fine movements, providing high-resolution sensing capabilities.
• Wide Operating Temperature Range: It is designed to operate over a broad temperature range, making it suitable for various industrial environments.
• Output Phototransistor: The silicon phototransistor provides a stable output that is easy to interface with other electronic components.

Applications:

• Printer paper jam detection
• Limit switching
• Coin counting
• Object positioning and detection
• General purpose interrupter

With its compact design, the H21B4 can be easily integrated into space-constrained applications. Its straightforward interfacing requirements make it simple to connect to microcontrollers or other logic systems. Whether you're designing a new system or upgrading an existing one, the H21B4 from ON Semiconductor is an excellent choice for a reliable and efficient optical interrupter switch.

For more detailed specifications and application guidelines, designers and engineers are encouraged to consult the H21B4 datasheet available on the ON Semiconductor website.