3910D-24CM-SMA RF Antenna Equivalent & Substitute Parts

Part Overview

The 3910D-24CM-SMA is a 1.575GHz GPS module RF antenna manufactured by PCTEL, Inc., designed for navigation applications within the UHF frequency band (1GHz ~ 2GHz). This antenna features a 240mm cable, integrated LNA and filter, SMA termination, magnetic mounting, and IP67 ingress protection. The product is currently classified as obsolete, necessitating identification of active equivalent components to maintain system compatibility and ensure continued availability for new designs and field replacements.

Substiute Parts

3910D-24CM-SMA

PCTEL, Inc.In Stock: 12653910D-24CM-SMA Datasheet

Current PartRFQ

3917D

PCTEL, Inc.In Stock: 8333917D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3910D-24CM-SMA is determined by strict equivalence across the following critical parameters:

Frequency Compatibility: Center frequency of 1.575GHz with operational range of 1.565GHz ~ 1.585GHz must be maintained to ensure GPS signal reception within the L1 band.

Antenna Configuration: Module-type antenna with single-band operation is required for direct functional replacement.

Electrical Interface: SMA termination type ensures connector compatibility with existing RF circuits and cabling.

Mechanical Integration: Magnetic mounting type and maximum height of 0.535" (13.60mm) must be preserved for physical installation compatibility.

Environmental Rating: IP67 ingress protection classification must be maintained for equivalent environmental performance.

Integrated Components: Presence of LNA (Low Noise Amplifier) and filter functionality must be retained for signal conditioning.

RF Performance: Gain specification of -2dBic and 3dBic must be matched for equivalent antenna performance.

The substitute part 3917D meets all these critical parameters while offering active product status and improved cable length (3m versus 240mm), making it a direct functional equivalent.

Parameter Comparison

Engineering Selection Recommendations

The 3917D is the manufacturer-recommended substitute for the obsolete 3910D-24CM-SMA. Selection of the 3917D is based on the following engineering criteria:

Product Status: The 3917D maintains active product status, ensuring continued availability, manufacturing support, and supply chain reliability. The 3910D-24CM-SMA is obsolete and subject to discontinuation of inventory and technical support.

Functional Equivalence: Both antennas operate at identical center frequency (1.575GHz) and frequency range (1.565GHz ~ 1.585GHz), with matching gain specifications (-2dBic, 3dBic), ensuring equivalent RF performance in GPS applications.

Mechanical Compatibility: Identical mounting type (magnetic), height specification (0.535" / 13.60mm), and ingress protection rating (IP67) ensure direct physical and environmental compatibility.

Electrical Interface: Both components feature SMA termination with integrated LNA and filter functionality, providing equivalent signal conditioning and connector compatibility.

Compliance: Both parts share identical ECCN (7A994) and HTSUS (8529.10.4040) classifications, maintaining regulatory and trade compliance equivalence.

Cable Configuration Difference: The 3917D provides a 3-meter cable versus the 240mm cable of the 3910D-24CM-SMA. This extended cable length offers greater installation flexibility and is suitable for applications requiring remote antenna placement from the receiver module.

Application Scope: The 3917D supports both GNSS and GPS applications, providing broader compatibility than the GPS-only specification of the 3910D-24CM-SMA.

Frequently Asked Questions (FAQ)

Q: Can the 3917D directly replace the 3910D-24CM-SMA in existing GPS systems?

A: Yes. The 3917D is electrically and mechanically equivalent to the 3910D-24CM-SMA across all critical parameters: center frequency (1.575GHz), frequency range (1.565GHz ~ 1.585GHz), gain (-2dBic, 3dBic), SMA termination, magnetic mounting, and IP67 rating. The primary difference is the extended 3-meter cable length compared to the 240mm cable of the original part.

Q: What is the significance of the cable length difference between the two parts?

A: The 3910D-24CM-SMA features a 240mm (approximately 9.4-inch) cable, while the 3917D provides a 3-meter (approximately 118-inch) cable. The extended cable length of the 3917D allows for greater separation between the antenna and receiver module, accommodating applications with remote antenna placement requirements. Both cable lengths terminate in SMA connectors with identical electrical characteristics.

Q: Are the RF performance characteristics identical between these two antennas?

A: Yes. Both antennas operate at 1.575GHz center frequency with a 1.565GHz ~ 1.585GHz operational range and identical gain specifications of -2dBic and 3dBic. Both include integrated LNA and filter components for equivalent signal conditioning.

Q: Why is the 3910D-24CM-SMA classified as obsolete?

A: The 3910D-24CM-SMA is classified as obsolete by the manufacturer, indicating that production has been discontinued and inventory is being depleted. The 3917D is the active replacement product, ensuring continued availability and manufacturer support for new designs and field replacements.

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

A: No. Both parts share identical ECCN (7A994) and HTSUS (8529.10.4040) classifications, ensuring equivalent compliance with export control and trade regulations.

Q: What applications are supported by the 3917D?

A: The 3917D supports both GNSS (Global Navigation Satellite System) and GPS applications. The 3910D-24CM-SMA is specified for GPS applications only. This broader application scope of the 3917D provides additional compatibility for multi-constellation navigation systems.

Q: Is the SMA termination type identical on both antennas?

A: The 3910D-24CM-SMA features SMA termination, while the 3917D specifies SMA Male termination. SMA Male is the standard SMA connector type and is fully compatible with standard SMA receptacle connectors used in GPS receiver modules and RF circuits.

Q: What is the physical mounting difference between these antennas?

A: Both antennas use magnetic mounting type and share identical maximum height specifications of 0.535" (13.60mm). The magnetic base allows for secure attachment to ferrous metal surfaces, with equivalent mechanical performance between the two parts.