A5191HRTPG-XTP

Overview

The A5191HRTPG-XTP is a discontinued single-chip CMOS modem designed for Highway Addressable Remote Transducer (HART) field instruments and masters. It provides all physical layer functions, including modulation, demodulation, receive filtering, carrier detect, and transmit-signal shaping. The device utilizes phase continuous frequency shift keying (FSK) at 1200 bits per second with Bell 202 shift frequencies of 1200 Hz and 2200 Hz. It operates on a 3.0 V to 5.5 V power supply and supports an industrial temperature range from −40 °C to +85 °C. This specific part number corresponds to the 28-pin PLCC package configuration.

Feature Summary

• Single-chip implementation of half-duplex FSK modem functionality
• Integrated transmit signal wave shaping and receive band-pass filter
• Low power consumption suitable for intrinsically safe applications
• Compatible with 3.3 V or 5 V microcontrollers

Applications

• HART multiplexers
• HART modem interfaces
• 4-20 mA loop powered transmitters

Procurement Notes

This component has been officially marked as discontinued by the manufacturer. Verification of current availability requires direct consultation with authorized distributors or sales representatives. Do not assume standard stock levels exist. Confirm end-of-life status and potential obsolescence risks before initiating any design-in process.

Selection Notes

Designers should evaluate alternative HART modem components due to the discontinuation of this specific part number. Verify that replacement devices maintain compatibility with existing 460.8 kHz clock requirements and HART physical layer specifications. Ensure the selected substitute supports the required 28-pin PLCC package or accommodates necessary PCB layout modifications.

Part Context

The A5191HRT series serves as a specialized interface between microprocessors and process loops in industrial automation. It enables digital communication superimposed on 4-20 mA analog signals. The XTP suffix indicates tape and reel shipping configuration, while PG denotes the 28-pin plastic leaded chip carrier package type.

Replacement Considerations

Public confirmed substitutes include NCN5192 and NCN5193. These newer models offer updated packaging options and potentially improved performance characteristics while maintaining HART protocol compliance.