A5191HRTPG-XTD

Overview

The A5191HRTPG-XTD is a 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 using phase continuous frequency shift keying at 1200 bits per second. The device operates on a 3.0 V to 5.5 V power supply and supports half-duplex communication by disabling receive circuits during transmission. It features an internal oscillator requiring a 460.8 kHz crystal or ceramic resonator and meets HART physical layer requirements within an industrial temperature range of −40°C to +85°C.

Feature Summary

• Single-chip implementation of half-duplex FSK modem with integrated modulator, demodulator, and carrier detect circuitry
• Low power consumption optimized for intrinsically safe applications through automatic receive/transmit circuit switching
• Compatible with 3.3 V or 5 V microcontrollers via digital interface pins

Applications

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

Procurement Notes

Verify the specific suffix PG indicates the 28-pin PLCC package configuration. Confirm the XTD suffix corresponds to tube/tray shipping rather than tape and reel. Check current availability status as some variants in this family have been discontinued. Ensure the component matches the RoHS compliant and lead-free specifications required for your assembly process.

Selection Notes

Select this part when a dedicated HART physical layer modem is required for master or slave implementations. Ensure the design accommodates the 28-pin PLCC footprint and utilizes a 460.8 kHz external resonator. Verify that the system voltage remains within the 3.0 V to 5.5 V operating range and that the microcontroller logic levels are compatible with the specified input thresholds.

Part Context

This component belongs to the A5191HRT family of HART modems manufactured by onsemi. The PG suffix specifically denotes the 28-pin plastic leaded chip carrier package variant. Other family members include QFN and LQFP packages with different suffixes such as N and L. The device integrates analog and digital sections to simplify HART interface design.

Replacement Considerations

Public confirmed substitute part numbers: None identified.