STMicroelectronics

ST485BN

ST485BN Description

The ST485BN is a half-duplex transceiver designed for reliable data transmission in RS422 and RS485 protocols. Manufactured by STMicroelectronics, this interface IC chip features one driver and one receiver, making it suitable for applications requiring efficient communication over long. distances The ST485BN operates within a supply voltage range of 4.75V to 5.25V and supports a data rate of up to 2.5 Mbps, ensuring fast and accurate data transfer. The receiver hysteresis of 70 mV enhances signal integrity by reducing the likelihood of false triggering due to noise. The device is packaged in a tube and has a through-hole mounting type, making it compatible with a variety of printed circuit board (PCB) designs. The ST485BN is classified under ECCN EAR99 and HTSUS 8542.39.0001, and it complies with REACH and RoHS3 standards, ensuring environmental sustainability and regulatory compliance. Although the product is now obsolete, its robust design and performance make it a reliable choice for existing systems.

ST485BN Features

• Half-Duplex Operation: The ST485BN supports half-duplex communication, allowing for efficient use of a single communication line for both transmitting and receiving data. This feature is particularly beneficial in applications where bidirectional communication is required but use the of separate lines for transmission and reception is impractical.
• Receiver Hysteresis: With a receiver hysteresis of 70 mV, the ST485BN provides enhanced noise immunity, reducing the risk of false triggering and ensuring reliable signal reception even in noisy environments.
• Data Rate: The transceiver supports a data rate of up to 2.5 Mbps, making it suitable for high-speed data transmission applications. This high data rate capability ensures that the ST485BN can handle large volumes of data efficiently, reducing latency and improving overall system performance.
• Supply Voltage Range: The ST485BN operates within a supply voltage range of 4.75V to 5.25V, providing flexibility in power supply requirements. This wide voltage range ensures compatibility with various power sources, making the device suitable for a wide range of applications.
• Environmental Compliance: The ST485BN is REACH unaffected and RoHS3 compliant, demonstrating STMicroelectronics' commitment to environmental sustainability. These certifications ensure that the device meets stringent regulatory standards, making it suitable for use in environmentally conscious applications.
• Mounting and Packaging: The through-hole mounting type and tube packaging make the ST485BN easy to integrate into existing PCB designs. The through-hole mounting provides robust mechanical stability, while the tube packaging ensures easy handling and storage.

ST485BN Applications

The ST485BN is ideal for a variety of industrial and commercial applications where reliable data transmission is crucial. Some specific use cases include:

• Industrial Automation: The ST485BN's robust design and high data rate make it suitable for industrial automation systems, where real-time data transmission between sensors, controllers, and actuators is essential. Its noise immunity ensures reliable operation in the harsh electromagnetic environments often found in industrial settings.
• Building Automation: In building automation systems, the ST485BN can be used for communication between various devices such as HVAC controllers, lighting systems, and security systems. Its half-duplex operation allows for efficient use of communication lines, reducing installation costs and complexity.
• Data Acquisition Systems: The ST485BN's high data rate and reliable performance make it an excellent choice for data acquisition systems, where accurate and timely data transmission is critical. Its compatibility with RS422 and RS485 protocols ensures seamless integration with existing data acquisition networks.
• Telecommunications: In telecommunication applications, the ST485BN can be used for communication between base stations, repeaters, and other network components. Its robust design and high data rate ensure reliable data transmission, even over long distances.

Conclusion of ST485BN

The ST485BN is a versatile and reliable half-duplex transceiver designed for efficient data transmission in RS422 and RS485 protocols. Its unique features, such as receiver hysteresis and high data rate, provide significant performance benefits over similar models. The ST485BN's robust design and environmental compliance make it suitable for a wide range of applications, including industrial automation, building automation, data acquisition systems, and telecommunications. Although now obsolete, the ST485BN remains a reliable choice for existing systems, ensuring continued performance and reliability.