Texas Instruments

SN65HVD22D

SN65HVD22D Description

The SN65HVD22D from Texas Instruments is a half-duplex RS-485/RS-422 transceiver designed for robust differential communication in industrial and automotive environments. Packaged in an 8-pin SOIC and rated for surface-mount assembly, it operates within a 4.5V to 5.5V supply range, supporting data rates up to 500kbps. This device integrates one driver and one receiver, making it ideal for bidirectional data transmission over long distances with noise immunity. With 130mV of receiver hysteresis, it ensures reliable signal integrity in electrically noisy conditions. The transceiver is RoHS3 compliant and adheres to REACH and ECCN 5A991B1 regulations, though it is marked as obsolete in TI's product lineup.

SN65HVD22D Features

• Half-Duplex Operation: Enables bidirectional communication on a single differential pair.
• High Noise Immunity: 130mV hysteresis minimizes false triggering in noisy environments.
• Wide Supply Range: 4.5V–5.5V compatibility suits diverse industrial power systems.
• Robust Protocol Support: Compliant with RS-485 and RS-422 standards for long-distance communication.
• Surface-Mount Design: 8-SOIC package (Moisture Sensitivity Level 1) facilitates compact PCB layouts.
• Low-Power Reliability: Optimized for 500kbps data rates with minimal power consumption.

SN65HVD22D Applications

• Industrial Automation: PLCs, motor control, and sensor networks requiring noise-resistant communication.
• Building Automation: HVAC systems, lighting control, and security networks.
• Telecom Infrastructure: Base stations and signal repeaters leveraging RS-485 robustness.
• Automotive Systems: Diagnostic tools and in-vehicle networks where EMI resilience is critical.
• Legacy System Upgrades: Retrofitting older RS-422/485 installations with reliable transceivers.

Conclusion of SN65HVD22D

The SN65HVD22D offers a balance of performance, reliability, and compliance, making it a strong choice for noise-prone, half-duplex communication systems. While obsolete, its high hysteresis, wide voltage range, and industrial-grade durability ensure continued utility in legacy designs or replacement scenarios. Engineers should evaluate alternative TI offerings for new designs but can rely on this transceiver for proven performance in harsh environments.