XT09-SI RF Transceiver Module - Equivalent & Substitute Parts

Part Overview

The XT09-SI is a General ISM < 1GHz transceiver module manufactured by Digi as part of the XTend® series. This module operates at 900MHz with FHSS and FSK modulation, delivering 225kbps data rate and 30dBm output power. The XT09-SI features RP-SMA chassis mount antenna connector and UART serial interface, with supply voltage range of 2.8V to 5.5V.

The XT09-SI is classified as Obsolete. Locating equivalent substitute parts is necessary for system redesign, production continuation, or component replacement in existing installations where the original part is no longer available from primary sources.

Substiute Parts

XT09-SI

DigiIn Stock: 941XT09-SI Datasheet

Current PartRFQ

XTP9B-DPS-001

DigiIn Stock: 1942XTP9B-DPS-001 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The XTP9B-DPS-001 qualifies as a direct substitute for the XT09-SI based on the following alignment of critical parameters:

Matching Parameters:

• Manufacturer: Digi (same manufacturer, XTend® series continuity)
• RF Family/Standard: General ISM < 1GHz (identical frequency band)
• Power - Output: 30dBm (identical output power)
• Sensitivity: -110dBm (identical receiver sensitivity)
• Voltage - Supply: 2.8V ~ 5.5V (identical supply range)
• Serial Interfaces: UART (identical interface)
• Antenna Type: RP-SMA (identical connector type)
• Operating Temperature: -40°C ~ 85°C (identical temperature range)

Differing Parameters:

• Frequency: XT09-SI operates at fixed 900MHz; XTP9B-DPS-001 operates across 902MHz ~ 928MHz band
• Modulation: XT09-SI supports FHSS and FSK; XTP9B-DPS-001 supports FSK only
• Data Rate: XT09-SI at 225kbps; XTP9B-DPS-001 at 125kbps
• Mounting Type: XT09-SI is Chassis Mount; XTP9B-DPS-001 is Surface Mount
• Current - Receiving: XT09-SI at 80mA; XTP9B-DPS-001 at 35mA
• Current - Transmitting: XT09-SI at 90mA ~ 730mA; XTP9B-DPS-001 at 710mA
• Product Status: XT09-SI is Obsolete; XTP9B-DPS-001 is Active
• RoHS Status: XT09-SI is non-compliant; XTP9B-DPS-001 is compliant

Parameter Comparison

Engineering Selection Recommendations

The XTP9B-DPS-001 is the direct substitute for the obsolete XT09-SI. Selection of this substitute is supported by the following engineering factors:

Product Status Alignment: The XTP9B-DPS-001 is Active status, ensuring ongoing availability and manufacturer support, whereas the XT09-SI is Obsolete and subject to supply discontinuation.

Regulatory Compliance: The XTP9B-DPS-001 is RoHS Compliant, meeting current environmental and material restriction standards. The XT09-SI is RoHS non-compliant, which may present regulatory barriers in new designs or system certifications.

Core RF Performance: Both modules deliver identical output power (30dBm) and receiver sensitivity (-110dBm), maintaining equivalent RF link performance. Both operate within the General ISM < 1GHz band with identical supply voltage requirements (2.8V ~ 5.5V) and temperature operating range (-40°C ~ 85°C).

Interface Compatibility: Both modules feature UART serial interface and RP-SMA antenna connector, ensuring protocol and antenna compatibility.

Design Integration Considerations: The XTP9B-DPS-001 uses Surface Mount packaging versus the XT09-SI Chassis Mount approach. This requires PCB layout modification. The substitute operates at 125kbps data rate compared to the original 225kbps, and supports FSK modulation only (FHSS not available). Receive current consumption is lower (35mA versus 80mA), providing power efficiency benefit.

Frequently Asked Questions (FAQ)

Q: Can the XTP9B-DPS-001 directly replace the XT09-SI in existing hardware?

A: The XTP9B-DPS-001 provides electrical and RF functional equivalence but requires mechanical redesign due to different mounting types. The XT09-SI uses Chassis Mount; the XTP9B-DPS-001 uses Surface Mount. PCB layout and mechanical integration must be modified accordingly.

Q: What is the impact of the data rate difference (225kbps vs. 125kbps)?

A: The XTP9B-DPS-001 operates at 125kbps versus the XT09-SI at 225kbps. This represents a 44% reduction in maximum data throughput. System communication protocols must accommodate this lower data rate.

Q: Does the XTP9B-DPS-001 support FHSS modulation like the XT09-SI?

A: No. The XTP9B-DPS-001 supports FSK modulation only. The XT09-SI supports both FHSS and FSK. If FHSS is required for frequency hopping functionality, the XTP9B-DPS-001 is not suitable.

Q: What are the frequency band differences?

A: The XT09-SI operates at fixed 900MHz. The XTP9B-DPS-001 operates across 902MHz ~ 928MHz band. The substitute covers the original frequency with additional bandwidth capability.

Q: Are there power consumption benefits with the substitute?

A: Yes. The XTP9B-DPS-001 draws 35mA in receive mode versus 80mA for the XT09-SI, representing 56% lower receive current consumption. Transmit current is comparable (710mA versus 90mA ~ 730mA range).

Q: What is the significance of RoHS compliance difference?

A: The XTP9B-DPS-001 is RoHS Compliant; the XT09-SI is non-compliant. RoHS compliance is required for products sold in EU markets and for many industrial and commercial applications. The substitute meets these regulatory requirements.

Q: Are both modules from the same manufacturer?

A: Yes. Both the XT09-SI and XTP9B-DPS-001 are manufactured by Digi and are part of the XTend® product series, ensuring design continuity and protocol compatibility.