Pomona Electronics 4859 SMA Connector Plug - Equivalent & Substitute Parts

Part Overview

The Pomona Electronics 4859 is an SMA connector plug with male pin configuration, rated for 50 ohms impedance and designed for free-hanging (in-line) solder termination. This connector is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new designs requiring compatible RF connectivity solutions.

The 4859 accommodates RG-55 and RG-142 cable groups with a maximum operating frequency of 18 GHz and includes four components: connector body, contact, ferrule, and heat shrink tubing. The stainless steel body with gold-plated brass center contact provides reliable RF performance in coaxial applications.

Substiute Parts

4859

Pomona ElectronicsIn Stock: 10894859 Datasheet

Current PartRFQ

142-0408-011

Cinch Connectivity SolutionsIn Stock: 1093142-0408-011 Datasheet

SimilarRFQ

901-10009-RFX

Amphenol RFIn Stock: 1173901-10009-RFX Datasheet

SimilarRFQ

901-10024-RFX

Amphenol RFIn Stock: 760901-10024-RFX Datasheet

SimilarRFQ

901-10025-RFX

Amphenol RFIn Stock: 1196901-10025-RFX Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Pomona Electronics 4859 is determined by the following core parameters:

• Connector Style & Type: All substitutes must be SMA connectors with male pin plug configuration
• Impedance: 50 ohms impedance is mandatory for RF signal integrity
• Contact Termination: Solder termination is the primary requirement; crimp or solder hybrid capability is acceptable
• Shield Termination: Crimp termination is required
• Mounting Configuration: Free hanging (in-line) mounting type must be maintained
• Fastening Type: Threaded fastening is required
• Dielectric Material: PTFE dielectric is specified
• Compliance: ROHS3 compliance is required

The substitute parts identified (901-10025-RFX, 901-10024-RFX, 142-0408-011, and 901-10009-RFX) meet these core substitution criteria. Variations in frequency rating, body material finish, cable group compatibility, and operating temperature ranges represent secondary differences that do not prevent functional substitution in applications compatible with the specified parameters.

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts are active products with current manufacturing status, providing supply chain continuity for applications currently using the obsolete Pomona 4859.

Amphenol RF 901-10025-RFX is the primary substitute. It matches the core electrical and mechanical specifications of the 4859, including solder contact termination, gold body finish, and weatherproof ingress protection. Operating temperature range of -65°C to 165°C and 500 mating cycles support demanding applications. ROHS3 compliance and REACH affected status align with current regulatory requirements.

Amphenol RF 901-10024-RFX provides an alternative with identical electrical specifications and solder termination. The nickel body finish and silver housing color differentiate this variant. Weatherproof ingress protection and equivalent operating temperature and mating cycle ratings make this suitable for applications requiring corrosion resistance in harsh environments.

Amphenol RF 901-10009-RFX offers solder termination with gold body finish and housing. This variant supports Belden 9258 and LMR-240 cable groups, providing flexibility for specific cable compatibility requirements while maintaining all core electrical parameters.

Cinch Connectivity Solutions 142-0408-011 provides hybrid crimp or solder contact termination capability, offering installation flexibility. Gold body finish and brass housing material match the Amphenol alternatives. Operating temperature range of -65°C to 165°C and 500 mating cycles provide equivalent performance ratings. This part supports expanded cable group compatibility (RG-55, 142, 223, 400).

All substitutes are ROHS3 compliant and carry EAR99 ECCN classification matching the original part.

Frequently Asked Questions (FAQ)

Q: Can the Pomona 4859 be directly replaced with any of these substitute parts?

A: Yes. All four substitute parts meet the core substitution criteria: SMA male plug configuration, 50 ohms impedance, solder contact termination, crimp shield termination, free-hanging mounting, threaded fastening, PTFE dielectric, and ROHS3 compliance. Physical and electrical compatibility is established through these matching parameters.

Q: What is the significance of the frequency rating difference (18 GHz vs. 12.4 GHz)?

A: The Pomona 4859 specifies 18 GHz maximum frequency, while all substitutes are rated to 12.4 GHz. For applications operating below 12.4 GHz, this difference is not a limiting factor. Applications requiring operation above 12.4 GHz must evaluate whether the lower frequency rating of substitutes is acceptable for the specific system design.

Q: Are there cable group compatibility differences I should consider?

A: Yes. The Pomona 4859 is specified for RG-55 and RG-142 cable groups. Substitute parts support different cable group combinations: Amphenol 901-10009-RFX supports Belden 9258 and LMR-240; Amphenol 901-10024-RFX and 901-10025-RFX support RG-179, 188, 316 Double Braid, and M17/152-RD316; Cinch 142-0408-011 supports RG-55, 142, 223, and 400. Cable group selection should match your specific cable type requirements.

Q: What is the difference between solder-only and crimp-or-solder termination?

A: The Pomona 4859 and three Amphenol substitutes specify solder-only contact termination. The Cinch 142-0408-011 offers hybrid crimp-or-solder capability, allowing installation flexibility. Both approaches provide equivalent electrical performance when properly executed; the choice depends on your assembly process and equipment availability.

Q: Do all substitutes have the same operating temperature range?

A: No. The Pomona 4859 does not specify an operating temperature range. All four substitutes specify -65°C to 165°C operating temperature. If your application requires operation outside this range, this specification must be evaluated against your system requirements.

Q: Are there differences in the included components?

A: Yes. The Pomona 4859 includes four components (connector, contact, ferrule, heat shrink). Amphenol 901-10009-RFX and 901-10025-RFX also include four components (connector, contact, ferrule, heat shrink). Amphenol 901-10024-RFX includes three components (connector, contact, ferrule). Cinch 142-0408-011 includes three components (connector, contact, sleeve). Verify that included components meet your assembly requirements.

Q: What is the mating cycle rating and why does it matter?

A: The Pomona 4859 does not specify mating cycles. All four substitutes are rated for 500 mating cycles, indicating the connector can withstand 500 connect-disconnect cycles while maintaining electrical performance. For applications with frequent mating and unmating, this specification ensures reliability over the product lifetime.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All four substitute parts carry ROHS3 compliance certification, matching the Pomona 4859. This ensures compliance with Restriction of Hazardous Substances regulations for lead-free manufacturing and restricted substance limitations.