Txrx, Rs422/485, 2.5Mbps, 85Degc/Nsoic14; Ic Type:Rs422/Rs485 Transceiver; No. Of Receivers:1Receivers; No. Of Transmitters:1; Communication Mode:Full Duplex; Data Rate Max:2.5Mbps; Supply Voltage Min:4.75V; Ic Case/Package:Nsoicrohs Compliant: Yes |Analog Devices MAX491ESD+

MAX491ESD+ – RS422/RS485 Full-Duplex Transceiver – Analog Devices

Enhance industrial communication systems with the MAX491ESD+ RS422/RS485 transceiver from Analog Devices. This robust IC delivers reliable differential data transmission with full-duplex capability, supporting high-speed connectivity in electrically noisy environments. Engineered for precision and durability, it ensures seamless signal integrity while minimizing power consumption—ideal for mission-critical applications where stability is non-negotiable.

Key Features

• Interface Protocol: RS422, RS485 compliant
• Data Rate: 2.5Mbps high-speed operation
• Duplex Mode: Full-duplex communication
• Voltage Range: 4.75V–5.25V single-supply operation
• Temperature Range: Industrial-grade -40°C to +85°C
• Noise Immunity: 70mV receiver hysteresis
• Compact Design: 14-SOIC surface-mount package (3.90mm width)

Technical Details

This transceiver integrates one driver and one receiver channel with built-in fail-safe circuitry, ensuring logic-level outputs remain high when inputs are open or shorted. Its 14-pin SOIC package (Supplier Device Package: 14-SOIC) enables space-efficient PCB layouts while maintaining ESD protection. Optimized for 5V systems, the MAX491ESD+ supports multidrop networks with up to 32 unit loads and features low-power shutdown modes.

Typical Applications

• Industrial automation controllers (PLC, HMI)
• Building management systems & HVAC controls
• Telecommunications infrastructure
• Medical diagnostic equipment
• Motor drive and robotics interfaces

About Analog Devices

Analog Devices (ADI) stands at the forefront of high-performance semiconductor innovation, with over 50 years of expertise in precision analog and digital signal processing. Following its acquisition of Maxim Integrated, ADI strengthened its portfolio in industrial and communications ICs, known for rigorous quality testing and extended product lifecycles.

As a global leader, ADI maintains ISO-certified manufacturing processes and invests heavily in reliability engineering. Their components undergo extreme environmental stress screening, making them the preferred choice for aerospace, automotive, and industrial sectors where zero-failure tolerance is critical.

About RS422/RS485 Transceivers

RS422/RS485 transceivers enable robust long-distance serial communication in electrically hostile environments. Unlike single-ended interfaces, these differential-signaling ICs reject common-mode noise and ground loops, supporting cable runs up to 1.2km. This makes them indispensable for industrial networks, where electromagnetic interference (EMI) from motors or power lines degrades signal quality.

Modern transceivers like the MAX491 series incorporate advanced features such as slew-rate limiting to reduce EMI, thermal shutdown protection, and enhanced ESD resilience (typically ±15kV). Their ability to operate in half/full-duplex configurations provides design flexibility for point-to-point or multidrop architectures in automation and instrumentation systems.

Packaging Options

Available in protective tube packaging for secure handling and automated assembly. For volume production requirements, contact PCX for custom reel options.

FAQs

Q: Does this support half-duplex operation?
A: No, the MAX491ESD+ operates exclusively in full-duplex mode, requiring separate transmit/receive lines.

Q: What’s the maximum cable length supported?
A: At 2.5Mbps, reliable communication extends up to 400 meters with 24AWG twisted-pair cable.

Q: Is external termination required?
A: Yes, 120Ω termination resistors at bus ends are necessary to prevent signal reflections.

Q: Can it tolerate industrial voltage surges?
A: Yes, the IC features ±15kV ESD protection on bus pins and survives common industrial transient events.

Q: How does receiver hysteresis prevent data errors?
A: The 70mV hysteresis creates a noise margin, ignoring signal fluctuations below this threshold to avoid false triggering.

Q: Is the MAX491ESD+ RoHS compliant?
A: Yes, this active-status device meets all current RoHS 3 directives.

📄 Datasheet Note: For pinout diagrams and timing specifications, download the MAX491ESD+ datasheet from PCXCo.com/resources.

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Leverage PCX’s industry-leading supply chain—all MAX491ESD+ transceivers ship from ISO-certified warehouses with same-day dispatch. Our technical support team provides design guidance to ensure seamless integration. Secure your inventory now to avoid project delays!

Disclaimer: Product images are representational; refer to datasheets for exact specifications.