DELTA11B/X/SMAM/S/S/21 Equivalent & Substitute Parts

Part Overview

The DELTA11B/X/SMAM/S/S/21 is a 869MHz ISM Whip Straight RF Antenna with SMA Male connector mount, manufactured by Siretta Ltd. This antenna is designed for UHF band applications within the 300MHz to 1GHz frequency range, delivering 2.15dB gain with a VSWR of 2. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system support and component procurement.

Substiute Parts

DELTA11B/X/SMAM/S/S/21

Siretta LtdIn Stock: 932DELTA11B/X/SMAM/S/S/21 Datasheet

Current PartRFQ

DELTA5A/X/SMAM/S/S/17

Siretta LtdIn Stock: 1125DELTA5A/X/SMAM/S/S/17 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DELTA11B/X/SMAM/S/S/21 is determined by the following critical parameters:

• Frequency Compatibility: Center frequency must operate within the ISM band allocation (868-869MHz range acceptable for ISM applications)
• Antenna Type: Whip, straight configuration required for form factor compatibility
• Termination: SMA Male connector mandatory for direct interface compatibility
• Mounting Type: Connector mount required
• Frequency Group: UHF band (300MHz ~ 1GHz)
• RF Family/Standard: General ISM standard

The DELTA5A/X/SMAM/S/S/17 meets all substitution criteria, operating at 868MHz (adjacent ISM frequency), maintaining identical antenna type, termination, and mounting specifications.

Parameter Comparison

Engineering Selection Recommendations

The DELTA5A/X/SMAM/S/S/17 is the qualified substitute for the obsolete DELTA11B/X/SMAM/S/S/21. Selection is based on the following factors:

• Product Status: The DELTA5A series is active and currently in production, ensuring long-term availability and supply chain continuity
• Compliance: The DELTA5A/X/SMAM/S/S/17 is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements
• Functional Compatibility: Both antennas share identical mechanical and electrical interfaces (SMA Male termination, connector mount, whip straight configuration)
• Frequency Alignment: The 868MHz center frequency of the substitute operates within the same ISM band as the original 869MHz design, maintaining application compatibility
• Performance Parameters: Gain differential (3dBi vs 2.15dB) and VSWR variance (2.1 vs 2) are within acceptable engineering tolerances for ISM band applications

Frequently Asked Questions (FAQ)

Q: Can the DELTA5A/X/SMAM/S/S/17 directly replace the DELTA11B/X/SMAM/S/S/21 without modification?

A: Yes. Both antennas feature SMA Male connectors and connector mount configurations, enabling direct physical and electrical interface compatibility. No adapter or modification is required.

Q: What is the frequency difference between these antennas, and does it affect application performance?

A: The DELTA11B operates at 869MHz while the DELTA5A operates at 868MHz. Both frequencies fall within the ISM band allocation. The 1MHz difference is negligible for ISM applications and does not require system recalibration.

Q: How do the gain specifications differ between the main part and substitute?

A: The DELTA11B provides 2.15dB gain, while the DELTA5A provides 3dBi gain. The DELTA5A offers approximately 0.85dB higher gain, which may improve link budget in range-limited applications.

Q: Is there a height difference between these antennas?

A: Yes. The DELTA11B has a maximum height of 4.651" (90.20mm), while the DELTA5A has a maximum height of 3.937" (100.00mm). The 9.8mm difference should be evaluated for space-constrained installations.

Q: What compliance certifications apply to the substitute part?

A: The DELTA5A/X/SMAM/S/S/17 is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.

Q: Why is the original DELTA11B marked as obsolete?

A: Obsolescence typically results from manufacturer discontinuation. The DELTA5A series represents the active product line from Siretta Ltd for ISM band whip antenna applications.