XT09-4EI-R Equivalent & Substitute Parts

Part Overview

The XT09-4EI-R is an RF transceiver modem manufactured by Digi, operating in the 902MHz to 928MHz frequency band with RS-232 and RS-485 interface support. This module is classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance, redesign, and procurement planning. The XTend® series component provides FSK modulation with 230kbps maximum data rate and 1W output power, designed for general-purpose wireless communication applications requiring NEMA 4 compliance.

Substiute Parts

XT09-4EI-R

DigiIn Stock: 741XT09-4EI-R Datasheet

Current PartRFQ

CL4790-1000-232

Laird Connectivity Inc.In Stock: 1560CL4790-1000-232 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the XT09-4EI-R is determined by the following critical parameters:

• Frequency Band: Both main and substitute parts must operate within the 902MHz to 928MHz ISM band
• Modulation Support: FSK capability is required for protocol compatibility
• Interface Type: RS-232 interface is the primary requirement; RS-485 dual support in the original is not mandatory in substitutes
• Power Output: Minimum 1W (1000mW) output power maintains link budget equivalence
• Data Rate: Minimum 115.2kbps supports legacy communication protocols
• Supply Voltage: Operating range must accommodate available power supplies
• Regulatory Compliance: REACH and ECCN classifications ensure legal deployment

The CL4790-1000-232 from Laird Connectivity Inc. meets these substitution criteria through matching frequency band, FSK modulation support, RS-232 interface, equivalent power output, and regulatory compliance status.

Parameter Comparison

Engineering Selection Recommendations

The CL4790-1000-232 is a valid substitute for the XT09-4EI-R based on the following factors:

• Regulatory Alignment: Both components maintain REACH Unaffected status and comply with applicable export control classifications
• Active Production Status: The CL4790-1000-232 is in active production, ensuring long-term availability and supply chain stability compared to the obsolete XT09-4EI-R
• Core Functionality: Matching frequency band, FSK modulation, RS-232 interface, and 1W power output preserve essential transceiver functionality
• Compliance Certifications: Identical Moisture Sensitivity Level (MSL 1) ensures equivalent handling and storage requirements

Design considerations for implementation include supply voltage adjustment from 5V to the 7V–18V range required by the CL4790-1000-232, and evaluation of the reduced maximum data rate (115.2kbps versus 230kbps) against actual application requirements.

Frequently Asked Questions (FAQ)

Q: Can the CL4790-1000-232 directly replace the XT09-4EI-R without circuit modifications?

A: Direct pin-for-pin replacement is not guaranteed. The primary difference is supply voltage: the XT09-4EI-R operates at 5V, while the CL4790-1000-232 requires 7V to 18V. Power supply circuitry must be modified accordingly. RS-232 interface pinouts should be verified against both datasheets before integration.

Q: What is the impact of the lower maximum data rate on system performance?

A: The CL4790-1000-232 supports 115.2kbps maximum data rate compared to the XT09-4EI-R's 230kbps. Applications operating at or below 115.2kbps experience no performance degradation. Systems requiring higher data rates must evaluate alternative substitutes or retain the original component if available from inventory.

Q: Are there differences in receiver sensitivity between these components?

A: The XT09-4EI-R provides -110dBm sensitivity, while the CL4790-1000-232 provides -99dBm sensitivity. This 11dB difference may impact link budget in low-signal environments. Applications with marginal signal conditions should account for this reduced sensitivity in range calculations.

Q: Does the CL4790-1000-232 support RS-485 interface like the original?

A: No. The CL4790-1000-232 provides RS-232 interface only. Applications requiring RS-485 communication must either source alternative substitutes with dual-interface support or implement external RS-232 to RS-485 conversion circuitry.

Q: What are the packaging and inventory implications?

A: The XT09-4EI-R is available in 697 pieces as new original stock. The CL4790-1000-232 is supplied in bulk packaging with 1508 pieces in active inventory. Packaging format differences may affect assembly processes and storage requirements.

Q: Are both components compliant with the same regulatory standards?

A: Both components maintain REACH Unaffected status and comply with applicable export control regulations. However, ECCN classifications differ: XT09-4EI-R is classified as 5A992C, while CL4790-1000-232 is classified as EAR99. Verify export compliance requirements for your specific jurisdiction and end-use application.