XT09-PKI-RA RF Transceiver Modem Equivalent & Substitute Parts

Part Overview

The XT09-PKI-RA is a 900MHz RF transceiver modem manufactured by Digi, part of the XTend® series. This component functions as a wireless modem with dual interface support (RS-232 and RS-485) and operates at 115.2kbps maximum data rate. The product is currently obsolete, making identification of suitable substitute components essential for system maintenance, redesign, or component sourcing in legacy applications.

Substiute Parts

XT09-PKI-RA

DigiIn Stock: 1072XT09-PKI-RA Datasheet

Current PartRFQ

XTP9B-PKI-RA

DigiIn Stock: 1132XTP9B-PKI-RA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the XT09-PKI-RA is determined by the following critical parameters:

Frequency Compatibility: The main part operates at 900MHz. Substitute parts must operate within the 900MHz ISM band (902–928MHz) to maintain regulatory compliance and interoperability with existing network infrastructure.

Modulation & Protocol: The XT09-PKI-RA uses FHSS (Frequency Hopping Spread Spectrum) and FSK (Frequency Shift Keying). Substitute parts must support FSK modulation at minimum to ensure signal compatibility.

Interface Type: The main part provides dual RS-232 and RS-485 serial interfaces. Substitute parts must support serial communication protocols compatible with these standards.

Sensitivity & Power Output: The main part achieves -110dBm sensitivity. Substitute parts must maintain equivalent or superior receiver sensitivity to preserve link budget performance.

Supply Voltage: The main part operates from 7V to 28V. Substitute parts must support this voltage range or a compatible subset to ensure integration with existing power supplies.

Series Continuity: Both the main part and substitute belong to the XTend® product family, ensuring design consistency and firmware compatibility.

Parameter Comparison

Engineering Selection Recommendations

The XTP9B-PKI-RA is the designated substitute for the obsolete XT09-PKI-RA based on the following engineering criteria:

Product Status Alignment: The XTP9B-PKI-RA maintains active product status with current manufacturing support, ensuring long-term availability and supply chain continuity compared to the obsolete XT09-PKI-RA.

Frequency Band Compliance: The XTP9B-PKI-RA operates within the 902–928MHz range, which encompasses the 900MHz operating point of the main part and maintains compliance with FCC regulations for the 900MHz ISM band.

Modulation Compatibility: Both parts support FSK modulation. The XTP9B-PKI-RA removes FHSS capability, but FSK remains the common protocol layer for serial communication.

Electrical Equivalence: Both parts maintain identical supply voltage range (7V–28V) and receiver sensitivity (-110dBm), ensuring direct integration into existing power distribution and antenna systems.

Regulatory Compliance: The XTP9B-PKI-RA maintains REACH Unaffected status consistent with the main part, and its "Not applicable" RoHS designation reflects its active product status with current compliance documentation.

Data Rate Enhancement: The XTP9B-PKI-RA provides 125kbps maximum data rate, exceeding the 115.2kbps specification of the XT09-PKI-RA, offering improved throughput capacity.

Frequently Asked Questions (FAQ)

Q: Can the XTP9B-PKI-RA directly replace the XT09-PKI-RA in existing systems?

A: The XTP9B-PKI-RA is electrically and functionally compatible for RF transceiver applications within the 900MHz ISM band. Both parts maintain identical supply voltage (7V–28V), receiver sensitivity (-110dBm), and serial interface protocols. The substitute operates at a higher data rate (125kbps vs. 115.2kbps) and provides specified power output (30dBm). Integration requires verification that the serial interface configuration (RS-232/RS-485) matches the application requirements.

Q: What is the frequency difference between the two parts?

A: The XT09-PKI-RA operates at a fixed 900MHz center frequency. The XTP9B-PKI-RA operates across the 902–928MHz band, which includes the 900MHz frequency and provides frequency agility within the ISM band. This range encompasses regulatory requirements for North American 900MHz applications.

Q: Are there interface compatibility concerns?

A: The XT09-PKI-RA explicitly supports RS-232 and RS-485 interfaces. The XTP9B-PKI-RA specifies "Serial" interface without explicit dual-interface designation. System designers must confirm that the XTP9B-PKI-RA serial interface configuration matches the application's RS-232 or RS-485 requirements before deployment.

Q: Does the removal of FHSS capability affect system performance?

A: The XT09-PKI-RA implements FHSS (Frequency Hopping Spread Spectrum) and FSK modulation. The XTP9B-PKI-RA implements FSK modulation only. FHSS provides frequency diversity and interference mitigation. Applications relying on FHSS-specific performance characteristics must evaluate whether FSK-only operation meets link budget and interference tolerance requirements.

Q: What is the packaging difference?

A: The XT09-PKI-RA packaging is not specified in available documentation. The XTP9B-PKI-RA is supplied in Box packaging. Mechanical form factor compatibility must be verified against application PCB layout and enclosure constraints.

Q: Are there supply chain advantages to using the substitute?

A: The XTP9B-PKI-RA maintains active product status with current manufacturing support, whereas the XT09-PKI-RA is obsolete. The substitute provides assured long-term availability, documented compliance certifications, and manufacturer technical support.