Pomona Electronics 4940 TNC Coaxial Connector Adapter

Part Overview

The Pomona Electronics 4940 is a coaxial connector adapter designed for RF applications requiring TNC jack-to-jack connections at 50 ohms impedance. This adapter provides a female socket to female socket configuration in a straight, free-hanging inline mounting style. The part is currently classified as obsolete, making identification of suitable substitute components essential for ongoing system maintenance and new design implementations.

Substiute Parts

4940

Pomona ElectronicsIn Stock: 87534940 Datasheet

Current PartRFQ

031-4791

Amphenol RFIn Stock: 951031-4791 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Pomona Electronics 4940 is determined by strict equivalence across the following critical parameters:

• Adapter configuration: Jack to Jack
• Connector series: TNC to TNC
• Center contact gender: Female to Female
• Impedance rating: 50 Ohms
• Mounting style: Straight, free-hanging inline
• Fastening mechanism: Threaded connections on both ends
• Core materials: Brass body with beryllium copper center contact and PTFE dielectric
• Regulatory compliance: ROHS3 Compliant

The Amphenol RF 031-4791 meets all these critical substitution criteria, providing functional and mechanical equivalence for applications currently using the Pomona 4940.

Parameter Comparison

Engineering Selection Recommendations

The Amphenol RF 031-4791 is a direct functional equivalent to the obsolete Pomona Electronics 4940. Both components share identical mechanical and electrical specifications across all critical substitution parameters: TNC jack-to-jack adapter configuration, 50 ohm impedance, female-to-female center contact gender, straight mounting style, and PTFE dielectric construction.

The Amphenol RF 031-4791 carries active product status with current manufacturing support, whereas the Pomona 4940 is obsolete. Both components maintain ROHS3 compliance and are suitable for applications requiring 50 ohm TNC coaxial adapter functionality. The Amphenol part provides additional documented specifications including 500 mating cycles, -65°C to 165°C operating temperature range, and 11 GHz maximum frequency capability, offering enhanced technical transparency for system design validation.

Frequently Asked Questions (FAQ)

Q: Can the Amphenol RF 031-4791 directly replace the Pomona Electronics 4940 in existing installations?

A: Yes. Both adapters share identical mechanical and electrical specifications across all critical parameters: TNC jack-to-jack configuration, 50 ohm impedance, female-to-female center contact gender, straight mounting style, and PTFE dielectric material. Physical form factor and connector interface are equivalent.

Q: What are the key substitution criteria for TNC coaxial adapter selection?

A: Substitution requires equivalence in adapter type (jack-to-jack), connector series (TNC-to-TNC), center contact gender (female-to-female), impedance rating (50 ohms), mounting style (straight, free-hanging), fastening mechanism (threaded), and core materials (brass body, beryllium copper center contact, PTFE dielectric).

Q: Why is the Pomona 4940 classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The Amphenol RF 031-4791 provides an active, currently manufactured alternative with identical functional specifications.

Q: Are there packaging or inventory considerations when transitioning from Pomona 4940 to Amphenol RF 031-4791?

A: Both components are supplied as individual adapters in free-hanging inline configuration. No packaging format differences affect substitution compatibility. Verify current inventory availability through your component supplier, as stock levels vary.

Q: Do the additional specifications provided for the Amphenol part affect compatibility?

A: No. The Amphenol RF 031-4791 specifications for mating cycles (500), operating temperature range (-65°C to 165°C), and maximum frequency (11 GHz) represent documented performance characteristics that do not alter mechanical or electrical equivalence. These specifications confirm the part meets or exceeds the functional requirements of the obsolete Pomona component.