AM26LS31DMB

Updated: 2026-09-12

Overview

The AM26LS31DMB is a quad differential line driver designed for reliable data transmission in noisy environments. Manufactured by Texas Instruments, it is widely used in industrial automation, automotive systems, and telecommunications infrastructure. This IC provides four independent differential drivers, enabling robust signal transmission over long cables. It complies with RS-422 standards and operates at speeds up to 32Mbps, making it suitable for modern high-speed applications.

Structure and Working Principle

The AM26LS31DMB integrates four differential drivers in a single 16-pin package (SOIC or similar). Each driver converts TTL/CMOS logic inputs to balanced differential outputs, doubling voltage swing while canceling common-mode noise. Internal circuitry includes output short-circuit protection and thermal shutdown features. The device operates from a single 5V supply, with typical current consumption of 40mA. Special design considerations minimize propagation delay skew between channels.

Key Features

The AM26LS31DMB offers several advantages for industrial applications: 1) High noise immunity through differential signaling, rejecting up to ±7V common-mode voltage. 2) Wide operating temperature range (-40°C to +85°C) for harsh environments. Additional features include 3-state outputs for bus sharing, controlled edge rates to reduce EMI, and compatibility with AM26LS32 receivers. The device meets or exceeds ANSI TIA/EIA-422-B and ITU-T V.11 standards.

Application Areas

Primary applications include industrial fieldbus networks (PROFIBUS, DeviceNet), motor control systems, and automotive electronics. The IC is commonly found in factory automation equipment, process control systems, and test measurement instruments. In telecommunications, it's used in base station equipment and network switches. The military/aerospace sector employs radiation-hardened versions for critical systems requiring reliable data transmission.

Maintenance and Precautions

When using AM26LS31DMB, always follow proper ESD precautions during handling. The device requires minimal maintenance but benefits from periodic signal integrity checks in continuous operation systems. Ensure proper termination (typically 100Ω resistor across differential lines) to prevent signal reflections. Avoid exceeding absolute maximum ratings, especially input voltages beyond supply rails which can trigger latch-up conditions.

B2B Procurement Guide

Industrial buyers should verify: 1) Authenticity through authorized distributors to avoid counterfeit parts. 2) Packaging options (tubes, reels) matching production requirements. 3) Compliance with industry standards for target applications. Consider purchasing engineering samples for prototype testing. Lead times vary but typically range 6-12 weeks for large orders. Some suppliers offer value-added services like programming or testing.