26LS33LM/B

Overview

The 26LS33LM/B is a high-speed differential line driver manufactured by Rochester Electronics. It implements the RS-422 standard for balanced digital interface circuits, providing reliable data transmission over twisted-pair cabling. The device features low output impedance and high noise immunity, making it suitable for noisy industrial environments. It operates with a wide common-mode voltage range and includes thermal shutdown protection to ensure robust performance under varying load conditions.

Feature Summary

• Supports RS-422 compliant differential signaling for long-distance communication
• Includes thermal shutdown circuitry to prevent damage during overload events
• Provides high noise rejection capabilities in electrically hostile environments

Applications

• Industrial automation control systems requiring reliable serial communication
• Data acquisition networks utilizing twisted-pair cable infrastructure
• Point-to-point or multi-drop serial bus architectures

Part Context

Rochester Electronics specializes in sustaining legacy semiconductor products that are no longer actively produced by original manufacturers. This component belongs to the AMD/Advanced Micro Devices 26LSxx family of line drivers, which were widely adopted for RS-422 applications. Rochester maintains production through licensed manufacturing processes to support existing designs without requiring redesign efforts.

Replacement Considerations

Direct pin-compatible replacements include other 26LS33 variants from different manufacturers such as Texas Instruments SN75176 series (with level shifting considerations) or NXP equivalents. Verify voltage levels and package dimensions when substituting with modern RS-422 transceivers.