Pomona Electronics 5379 SMB Coaxial Connector Jack - Equivalent & Substitute Parts

Part Overview

The Pomona Electronics 5379 is an SMB connector jack with a male pin configuration, designed for 50-ohm RF applications. This free-hanging solder-terminated connector supports frequencies up to 4 GHz and is compatible with standard coaxial cables including RG-174, RG-179, RG-187, RG-188, and RG-316. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs requiring compatible RF connectivity solutions.

Substiute Parts

5379

Pomona ElectronicsIn Stock: 11705379 Datasheet

Current PartRFQ

903-NM285P-51S

Amphenol RFIn Stock: 790903-NM285P-51S Datasheet

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FA1-NLSP-C01-1

Amphenol RFIn Stock: 874FA1-NLSP-C01-1 Datasheet

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FA1-NMSP-C01-1

Amphenol RFIn Stock: 973FA1-NMSP-C01-1 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the Pomona Electronics 5379 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Connector style: SMB
• Impedance: 50 Ohms
• Frequency capability: 4 GHz maximum
• Dielectric material: PTFE
• Center contact plating: Gold
• RoHS3 compliance

Secondary Considerations:

• Contact termination method (solder vs. crimp)
• Mounting configuration (free-hanging vs. panel mount)
• Operating temperature range
• Connector type polarity (jack vs. plug)

The substitute parts listed below maintain SMB connector compatibility and 50-ohm impedance specifications. However, differences in termination method, mounting type, and operating temperature ranges must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Amphenol RF 903-NM285P-51S is the closest functional equivalent to the Pomona 5379. Both connectors employ solder termination, free-hanging mounting, and snap-on fastening. The 903-NM285P-51S maintains 50-ohm impedance, 4 GHz frequency capability, and PTFE dielectric specifications. The primary difference is connector polarity: the Amphenol part is a plug with female socket, while the Pomona is a jack with male pin. This polarity reversal must be accommodated in mating connector selection. The Amphenol part is currently in active production status with 703 units in stock.

Amphenol RF FA1-NLSP-C01-1 and FA1-NMSP-C01-1 are panel-mount alternatives with crimp termination. These parts maintain SMB/Fakra hybrid connector style, 50-ohm impedance, and 4 GHz frequency capability. The transition from solder to crimp termination and from free-hanging to panel-mount configuration represents a significant design change. These parts are suitable only when panel-mount installation and crimp termination are compatible with system requirements. Both are currently in active production.

All substitute parts are ROHS3 compliant and maintain the required RF performance specifications for 50-ohm coaxial applications.

Frequently Asked Questions (FAQ)

Q: Can the Amphenol RF 903-NM285P-51S directly replace the Pomona 5379 in existing designs?

A: Direct mechanical and electrical replacement is not possible due to connector polarity reversal. The Pomona 5379 is a jack with male pin; the Amphenol 903-NM285P-51S is a plug with female socket. The mating connector must be selected to accommodate this polarity difference. Both maintain 50-ohm impedance and 4 GHz frequency capability.

Q: What is the primary difference between solder and crimp termination options?

A: The Pomona 5379 and Amphenol 903-NM285P-51S use solder termination for cable attachment. The Amphenol FA1-NLSP-C01-1 and FA1-NMSP-C01-1 use crimp termination. Solder termination requires soldering equipment and thermal management; crimp termination requires specialized crimping tools. Selection depends on manufacturing process and equipment availability.

Q: Are the Fakra connector variants compatible with standard SMB applications?

A: The Amphenol FA1-NLSP-C01-1 and FA1-NMSP-C01-1 are SMB/Fakra hybrid connectors. While they maintain SMB electrical specifications (50 ohms, 4 GHz), the Fakra mechanical interface differs from standard SMB. These parts are suitable only for applications specifically designed for Fakra connectors or where hybrid SMB/Fakra compatibility is required.

Q: What operating temperature limitations apply to substitute parts?

A: The Pomona 5379 operates from -65°C to 165°C. The Amphenol 903-NM285P-51S operates from -40°C to 155°C. The Amphenol FA1-NLSP-C01-1 and FA1-NMSP-C01-1 operate from -40°C to 100°C. Applications requiring the full -65°C to 165°C range of the original part cannot use the listed substitutes without thermal management modifications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The Pomona 5379 and all listed substitute parts (Amphenol RF 903-NM285P-51S, FA1-NLSP-C01-1, and FA1-NMSP-C01-1) are ROHS3 compliant.

Q: What cable types are compatible with these connectors?

A: The Pomona 5379 is compatible with RG-174, RG-179, RG-187, RG-188, and RG-316 cables. The Amphenol RF 903-NM285P-51S supports RG-174, RG-188, RG-188A, RG-316, LMR-100, and M17/119-RG174. The Amphenol FA1-NLSP-C01-1 and FA1-NMSP-C01-1 support the same cable group as the 903-NM285P-51S. Cable compatibility must be verified for specific applications.