DELTA11/X/SMAM/S/S/21 433MHz RF Antenna Equivalent & Substitute Parts

Part Overview

The DELTA11/X/SMAM/S/S/21 is a 433MHz ISM band whip antenna manufactured by Siretta Ltd, featuring a straight configuration with SMA male connector termination and 2.15dB gain. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new design implementations. The antenna is designed for connector mount applications in the UHF frequency range (300MHz–1GHz) with a maximum height of 90.20mm and VSWR of 2.

Substiute Parts

DELTA11/X/SMAM/S/S/21

Siretta LtdIn Stock: 924DELTA11/X/SMAM/S/S/21 Datasheet

Current PartRFQ

ANT-4HEL2-SMA

RF SolutionsIn Stock: 758ANT-4HEL2-SMA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DELTA11/X/SMAM/S/S/21 is determined by the following critical parameters:

• Frequency Alignment: Center frequency must be 433MHz to maintain ISM band compliance and system performance
• Antenna Configuration: Whip, straight geometry required for mechanical and electrical compatibility
• Connector Type: SMA male termination mandatory for direct interface compatibility
• Electrical Performance: VSWR of 2 or better and gain within acceptable operational range (2.0dB–2.15dB)
• Physical Dimensions: Maximum height compatibility with existing mounting constraints
• Regulatory Compliance: ECCN classification and export control alignment

The ANT-4HEL2-SMA from RF Solutions meets all substitution criteria within these parameters.

Parameter Comparison

Engineering Selection Recommendations

The ANT-4HEL2-SMA is a direct functional substitute for the DELTA11/X/SMAM/S/S/21. Both components share identical frequency operation (433MHz), antenna configuration (whip, straight), connector type (SMA male), and electrical performance specifications (VSWR 2, gain 2.0–2.15dB range). The ANT-4HEL2-SMA is currently in active production status, ensuring supply chain continuity and availability.

The primary design consideration is the physical height difference: the ANT-4HEL2-SMA measures 58.00mm versus the original 90.20mm. This reduced height may be advantageous in space-constrained applications or may require mechanical re-evaluation if the original antenna height was specified for performance or form-factor reasons.

Both components carry EAR99 export classification and are suitable for ISM band applications. The ANT-4HEL2-SMA is RoHS3 compliant and REACH unaffected, providing additional regulatory alignment for modern manufacturing standards.

Frequently Asked Questions (FAQ)

Q: Can the ANT-4HEL2-SMA directly replace the DELTA11/X/SMAM/S/S/21 without modification?

A: Yes, from an electrical and connector interface perspective. Both antennas operate at 433MHz with SMA male termination, identical VSWR (2), and comparable gain specifications (2.0dBi vs. 2.15dB). The primary consideration is the physical height difference (58mm vs. 90.20mm), which may affect mechanical mounting or performance in specific spatial configurations.

Q: What is the significance of the height difference between these two antennas?

A: The ANT-4HEL2-SMA is 32.20mm shorter than the original DELTA11/X/SMAM/S/S/21. This reduction may improve space efficiency in compact designs but should be verified if the original antenna height was critical to system performance or mechanical constraints.

Q: Are both antennas suitable for the same ISM band applications?

A: Yes. Both components are designed for 433MHz ISM band operation and feature identical connector types (SMA male) and electrical performance parameters (VSWR 2). They are functionally equivalent for general-purpose ISM applications.

Q: What is the difference between dB and dBi gain specifications?

A: Both measurements express antenna gain. The specifications provided (2.15dB and 2dBi) are within the same operational range and do not represent a substitution barrier for this application category.

Q: Why is the original part marked as obsolete?

A: Product obsolescence typically reflects manufacturer discontinuation. The ANT-4HEL2-SMA, maintained in active production by RF Solutions, provides continuity for applications requiring 433MHz whip antenna functionality.

Q: Are there any compliance or certification differences between these parts?

A: Both components carry EAR99 export classification. The ANT-4HEL2-SMA includes RoHS3 compliance and REACH unaffected status, aligning with current regulatory requirements for electronic components in regulated markets.