RFU-504 Equivalent & Substitute Parts

Part Overview

The RFU-504 is an active UHF male push-on connector manufactured by RF Industries, designed for coaxial RF applications operating at frequencies up to 300 MHz. This connector features a non-constant impedance design with a push-on contact termination and twist-on shield termination, rated for 500 V operation. The connector is constructed with brass body and center contact materials, nickel-plated finish, and silver-plated center contact, utilizing diallyl phthalate (DAP) as the dielectric material.

Substitute parts become necessary when the RFU-504 is unavailable, when alternative termination methods are required for specific assembly processes, or when alternative material specifications better suit application requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

RFU-504

RF IndustriesIn Stock: 820RFU-504 Datasheet

Current PartRFQ

83-58FCP-RFX

Amphenol RFIn Stock: 113183-58FCP-RFX Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The RFU-504 is substitutable with the Amphenol RF 83-58FCP-RFX based on the following critical parameters that define functional equivalence:

Matching Parameters:

• Connector Style: UHF
• Connector Type: Plug, Male Pin
• Impedance: Non-Constant
• Mounting Type: Free Hanging (In-Line)
• Fastening Type: Threaded
• Frequency - Max: 300 MHz
• Number of Ports: 1
• Voltage Rating: 500 V
• Body Material: Brass
• Body Finish: Nickel
• Center Contact Material: Brass
• Product Status: Active
• Moisture Sensitivity Level: 1 (Unlimited)

Differing Parameters:

• Contact Termination: Push On (RFU-504) versus Crimp or Solder (83-58FCP-RFX)
• Shield Termination: Twist On (RFU-504) versus Push On (83-58FCP-RFX)
• Center Contact Plating: Silver (RFU-504) versus Gold (83-58FCP-RFX)
• Dielectric Material: Diallyl Phthalate (RFU-504) versus Phenol Formaldehyde (83-58FCP-RFX)
• RoHS Status: ROHS3 Compliant (RFU-504) versus RoHS Compliant (83-58FCP-RFX)

The 83-58FCP-RFX serves as a functional substitute when alternative termination methods are required or when the substitute's material specifications are acceptable for the application.

Parameter Comparison

Engineering Selection Recommendations

Both the RFU-504 and 83-58FCP-RFX are active products with established compliance certifications. The RFU-504 maintains ROHS3 compliance, while the 83-58FCP-RFX maintains RoHS compliance. Both connectors share identical electrical specifications including 300 MHz maximum frequency, 500 V voltage rating, and non-constant impedance characteristics.

Selection between these parts depends on assembly process requirements. The RFU-504 utilizes push-on contact termination with twist-on shield termination, suitable for applications requiring quick-connect assembly methods. The 83-58FCP-RFX provides crimp or solder contact termination with push-on shield termination, suitable for applications requiring permanent or semi-permanent connections.

Material differences exist in center contact plating (silver versus gold) and dielectric material (DAP versus phenolic). These differences do not affect electrical performance at the specified operating frequency and voltage ratings but may influence long-term reliability characteristics in specific environmental conditions.

Frequently Asked Questions (FAQ)

Q: Can the 83-58FCP-RFX directly replace the RFU-504 in existing assemblies?

A: Direct mechanical replacement is possible due to identical UHF connector geometry, threaded fastening, and free-hanging mounting configuration. However, the contact termination method differs (push-on versus crimp/solder), requiring assessment of the cable termination compatibility with the substitute part's requirements.

Q: What is the significance of the different center contact plating materials?

A: The RFU-504 features silver-plated center contacts, while the 83-58FCP-RFX features gold-plated center contacts. Both materials provide adequate electrical conductivity and corrosion resistance at the specified operating frequency and voltage. Gold plating offers enhanced corrosion resistance in high-humidity environments, while silver plating provides lower contact resistance. Selection depends on environmental exposure requirements.

Q: Are there cable compatibility differences between these connectors?

A: The 83-58FCP-RFX is specified for use with RG-58, 58A, 58B, 58C, 141, 303, LMR-195, Belden B7806A, and 9907 cable groups. The RFU-504 does not specify cable group compatibility in the provided parameters. Cable compatibility must be verified based on the specific cable gauge and type used in the application.

Q: What are the implications of different dielectric materials?

A: The RFU-504 uses diallyl phthalate (DAP) dielectric material, while the 83-58FCP-RFX uses phenol formaldehyde (phenolic) dielectric material. Both materials are suitable for RF applications at 300 MHz and below. Phenolic materials typically offer lower cost, while DAP materials may provide enhanced dimensional stability. Selection depends on application-specific environmental and performance requirements.

Q: Do both connectors meet the same compliance standards?

A: The RFU-504 is ROHS3 compliant, while the 83-58FCP-RFX is RoHS compliant. Both meet RoHS requirements, with ROHS3 representing a more recent compliance standard. Both connectors carry MSL 1 (Unlimited) moisture sensitivity ratings and are classified under ECCN EAR99 with identical HTSUS codes.

Q: What packaging considerations apply to these substitutes?

A: The RFU-504 is supplied in standard packaging with 724 pieces available in new original stock. The 83-58FCP-RFX is supplied in bulk packaging with 1071 pieces available in new original stock. The 83-58FCP-RFX includes three components per connector: the connector body, coupling nut, and ferrule. Packaging requirements should be evaluated based on assembly process and inventory management needs.