RF Antenna 637117 - Equivalent & Substitute Parts

Part Overview

The Laird Connectivity Inc. model 637117 is a multi-band RF antenna module designed for cellular and navigation applications. This component operates across five frequency bands: 850MHz, 900MHz, 1.575GHz, 1.8GHz, and 1.9GHz, supporting AMPS, DCS, GPS, GSM, and PCS standards. The module features dual termination options (SMC and SMA connectors), a 6-meter cable with integrated LNA, and adhesive/hook-and-loop mounting capability. The product is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing system designs and maintenance applications.

Substiute Parts

637117

Laird Connectivity Inc.In Stock: 779637117 Datasheet

Current PartRFQ

TANGO19/5M/SMAM/SMAM/S/S/20

Siretta LtdIn Stock: 870TANGO19/5M/SMAM/SMAM/S/S/20 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Laird Connectivity 637117 is determined by the following critical parameters:

Frequency Coverage: The substitute must operate across the same five frequency bands (850MHz, 900MHz, 1.575GHz, 1.8GHz, 1.9GHz) or encompass the specified frequency ranges (824MHz ~ 960MHz, 1.71GHz ~ 1.99GHz).

Antenna Type and Form Factor: The substitute must be compatible with the application's physical and electrical requirements. The 637117 is a module-type antenna; substitutes may differ in form factor (such as puck-type) provided they maintain functional equivalence for the target application.

Termination Compatibility: The 637117 provides dual termination (SMC and SMA). Substitutes with single termination (such as SMA Male only) are acceptable if the system design accommodates the available connector type.

Gain and VSWR Performance: The substitute must deliver comparable gain across the operating bands and maintain VSWR within acceptable limits for the application.

Environmental and Compliance Requirements: The substitute must meet or exceed the RoHS and REACH compliance status of the original part.

The Siretta Ltd. TANGO19/5M/SMAM/SMAM/S/S/20 meets these substitution criteria through identical frequency band coverage, equivalent gain performance at 2dBi, improved VSWR (2.0 vs. 2.5), and superior compliance status (ROHS3 vs. RoHS Compliant).

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: Siretta TANGO19/5M/SMAM/SMAM/S/S/20

The Siretta TANGO19/5M/SMAM/SMAM/S/S/20 is the qualified substitute for the discontinued Laird 637117. This selection is based on the following engineering criteria:

Frequency Compatibility: Both parts operate across identical frequency bands (850MHz, 900MHz, 1.575GHz, 1.8GHz, 1.9GHz), ensuring direct functional equivalence for cellular and navigation applications.

Compliance Status: The Siretta part holds ROHS3 Compliant certification, which supersedes the RoHS Compliant status of the original part. Both parts maintain REACH Unaffected status.

Performance Metrics: The Siretta substitute demonstrates improved VSWR performance (2.0 versus 2.5), indicating superior impedance matching across the operating bands.

Product Availability: The Siretta part is currently Active in inventory (832 Pcs), whereas the Laird part is Discontinued at DiGi Electronics, making the substitute the only viable option for new procurement.

Form Factor Considerations: The Siretta part transitions from a module-type antenna with adhesive/hook-and-loop mounting to a puck-type antenna with panel mount capability. This change requires mechanical redesign of the mounting interface but does not affect electrical performance or frequency coverage.

Connector Transition: The original part provides dual termination (SMC and SMA). The substitute provides SMA Male termination only. System designs must accommodate this single-connector configuration.

Frequently Asked Questions (FAQ)

Q: Can the Siretta TANGO19/5M/SMAM/SMAM/S/S/20 directly replace the Laird 637117 without design modifications?

A: Electrical substitution is direct due to identical frequency band coverage and compatible gain performance. However, mechanical redesign is required because the mounting method changes from adhesive/hook-and-loop to panel mount, and the form factor changes from module to puck. Additionally, the connector transitions from dual termination (SMC/SMA) to single SMA Male termination.

Q: What is the impact of the VSWR difference (2.5 vs. 2.0)?

A: The Siretta substitute exhibits lower VSWR, indicating improved impedance matching and reduced signal reflection across the operating bands. This represents a performance improvement over the original part and does not create compatibility issues.

Q: Are there applications where the Laird 637117 cannot be substituted with the Siretta part?

A: Substitution is not suitable for applications requiring SMC termination, as the Siretta part provides only SMA Male connectivity. Applications requiring adhesive or hook-and-loop mounting without mechanical redesign capability also cannot use the panel-mount Siretta substitute.

Q: Does the height difference (25.00mm vs. 14.50mm) affect substitution?

A: The Siretta part is physically smaller, which may require mechanical redesign of the mounting enclosure. However, the reduced height may be advantageous for space-constrained applications.

Q: What compliance certifications should be verified before substitution?

A: Both parts are REACH Unaffected and RoHS/ROHS3 Compliant. The Siretta part holds the more current ROHS3 certification. Verify that your application requirements do not mandate the original Laird part number for regulatory or contractual reasons.

Q: Is the gain specification difference significant?

A: The Laird part specifies gain across five bands (0dBi, 0dBi, 4.5dBic, 2dBi, 2dBi), while the Siretta part specifies 2dBi. The Siretta specification represents the gain at the primary operating bands. This difference does not prevent substitution but requires verification that 2dBi gain is acceptable for your application across all five frequency bands.