ADM3078EARZ

Updated: 2026-07-15

Overview

The ADM3078EARZ is a high-speed, low-power RS-485/RS-422 transceiver manufactured by Analog Devices. Designed for industrial applications, this integrated circuit provides robust differential data transmission in electrically noisy environments. As a half-duplex transceiver, it supports data rates up to 500kbps and features enhanced ESD protection (±15kV on bus pins). The device operates from a single 5V supply and includes thermal shutdown and short-circuit protection features for increased reliability.

Structure and Working Principle

The ADM3078EARZ integrates a driver and receiver pair with fail-safe circuitry that ensures a known output state when inputs are open or shorted. The device uses differential signaling to reject common-mode noise, making it ideal for long-distance communication. The transceiver includes slew rate limiting to reduce EMI, with driver outputs that maintain high impedance when disabled. Receiver inputs feature high input impedance (96kΩ minimum) to allow for up to 256 transceivers on a single bus.

Key Features

Key features include ±15kV ESD protection on bus pins, low current shutdown mode (0.1μA typical), and operation across the industrial temperature range (-40°C to +85°C). The device meets TIA/EIA-485-A standards for RS-485 communication. Notably, the ADM3078EARZ offers high receiver input resistance, enabling large bus networks without additional repeaters. The integrated thermal shutdown feature protects the device during fault conditions, while the driver maintains high output impedance when powered down.

Application Areas

Primary applications include industrial automation systems, process control networks, building automation, and motor control systems. The transceiver is commonly used in programmable logic controllers (PLCs), HVAC systems, and measurement equipment. The robust design makes it suitable for electrically harsh environments found in factory floors, power plants, and transportation systems. Its low-power characteristics also make it valuable for battery-powered or energy-conscious applications.

Maintenance and Precautions

For optimal performance, implement proper PCB layout practices including ground planes and short trace lengths. Avoid excessive bus capacitance which can degrade signal integrity. Ensure proper termination resistors are used at both ends of the bus. When installing in high-noise environments, consider using shielded twisted pair cables and maintaining adequate physical separation from power cables. Regularly inspect connections for corrosion or mechanical damage that could affect performance.

B2B Procurement Guide

When procuring ADM3078EARZ transceivers, verify the supply chain authenticity as counterfeit components are a concern in the semiconductor market. Consider purchasing directly from authorized distributors or the manufacturer. For large-volume orders (typically 1,000+ units), negotiate pricing based on annual commitment. Lead times can vary from 4-12 weeks depending on market conditions, so plan procurement accordingly for production schedules.