Amphenol RF 31-70030 BNC Connector Plug Equivalent & Substitute Parts

Part Overview

The Amphenol RF 31-70030 is a BNC connector plug designed for coaxial cable termination in RF applications. This male pin connector features 75 Ohms impedance, free hanging (in-line) mounting with crimp termination, and operates across a frequency range up to 4 GHz. The part is currently in Active product status with 1096 units in stock.

Substitute parts are identified when equivalent electrical and mechanical parameters align with the main part specifications, allowing direct replacement in compatible applications. The 31-70030 has documented substitutes within the Amphenol RF product line that share core connector characteristics.

Substiute Parts

31-70030

Amphenol RFIn Stock: 112131-70030 Datasheet

Current PartRFQ

031-70008

Amphenol RFIn Stock: 851031-70008 Datasheet

Parametric EquivalentRFQ

31-321

Amphenol RFIn Stock: 73431-321 Datasheet

Parametric EquivalentRFQ

31-4702

Amphenol RFIn Stock: 99231-4702 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the Amphenol RF 31-70030 is based on the following critical parameters that must align for direct replacement compatibility:

Primary Substitution Criteria:

• Connector Style: BNC
• Connector Type: Plug, Male Pin
• Mounting Type: Free Hanging (In-Line)
• Contact Termination: Crimp
• Shield Termination: Crimp
• Fastening Type: Bayonet Lock
• Frequency - Max: 4 GHz or greater
• Operating Temperature Range: -65°C to 165°C minimum
• Mating Cycles: 500 or greater
• Cable Group Compatibility: Overlap with RG-59, 59B, 62, 140, 210, Belden 8241, 8263, 8279, 9209

Secondary Consideration:

• Impedance: The 31-70030 operates at 75 Ohms. Substitutes at different impedance values (50 Ohms) are listed but represent impedance-specific alternatives rather than direct electrical equivalents.

The substitute parts 031-70008, 31-321, and 31-4702 share the core BNC plug architecture, crimp termination method, and mechanical mounting characteristics. Impedance differences are noted as a distinguishing factor for application-specific selection.

Parameter Comparison

Engineering Selection Recommendations

For 75 Ohms Impedance Applications:

The 031-70008 is electrically equivalent to the 31-70030, sharing identical impedance (75 Ohms), frequency response (4 GHz), and operating temperature specifications. However, 031-70008 carries a "Not For New Designs" product status, indicating it is in end-of-life phase. For new designs requiring 75 Ohms impedance, the 31-70030 remains the recommended choice due to its Active product status and RoHS Compliant certification.

For 50 Ohms Impedance Applications:

The 31-321 and 31-4702 are 50 Ohms alternatives that share identical mechanical and termination characteristics with the 31-70030. These parts are suitable only for applications requiring 50 Ohms impedance. The 31-321 is ROHS3 Compliant and Active, making it the preferred 50 Ohms option. The 31-4702 is Active but carries RoHS non-compliant status, limiting its use in regulated environments.

Compliance Considerations:

The 31-70030 is RoHS Compliant. When selecting substitutes, note that 031-70008 and 31-321 are ROHS3 Compliant, while 31-4702 is RoHS non-compliant. For applications subject to RoHS regulations, 31-70030, 031-70008, or 31-321 are appropriate selections.

Frequently Asked Questions (FAQ)

Q: Can the 31-321 or 31-4702 be used as direct replacements for the 31-70030?

A: No. The 31-321 and 31-4702 operate at 50 Ohms impedance, while the 31-70030 operates at 75 Ohms. Impedance mismatch causes signal reflection and performance degradation. These parts are substitutes only for applications specifically designed for 50 Ohms systems.

Q: Is the 031-70008 a direct equivalent to the 31-70030?

A: The 031-70008 matches all critical electrical and mechanical parameters of the 31-70030, including 75 Ohms impedance, 4 GHz frequency response, and crimp termination. However, 031-70008 is designated "Not For New Designs," indicating end-of-life status. For new applications, the 31-70030 is the recommended choice.

Q: What is the difference between the 31-321 and 31-4702?

A: Both are 50 Ohms BNC plug connectors with identical mechanical specifications. The primary differences are: 31-321 is ROHS3 Compliant and Active; 31-4702 is RoHS non-compliant and Active. The 31-321 includes four components (connector, contact, ferrule, insulator), while 31-4702 includes three components (connector, contact, ferrule). Center contact plating differs: 31-321 uses Gold, 31-4702 uses Silver.

Q: Are all substitute parts compatible with the same cable groups?

A: Yes. All listed parts (31-70030, 031-70008, 31-321, 31-4702) are compatible with cable groups RG-59, 59B, 62, 140, 210, Belden 8241, 8263, 8279, and 9209.

Q: What is the significance of the "Not For New Designs" status on the 031-70008?

A: This designation indicates the part is in end-of-life phase and Amphenol RF does not recommend its use in new product designs. Existing inventory may be available, but long-term supply is not guaranteed. For new designs, select parts with Active status.

Q: Does center contact plating affect substitutability?

A: Center contact plating (Gold vs. Silver) affects corrosion resistance and contact reliability but does not prevent mechanical or electrical substitution. Gold plating (31-70030, 031-70008, 31-321) provides superior corrosion resistance. Silver plating (31-4702) is acceptable for standard applications but may show oxidation over extended storage or in corrosive environments.

Q: Which substitute part should be selected for RoHS-regulated applications?

A: For RoHS-regulated environments, select from: 31-70030 (RoHS Compliant, 75 Ohms), 031-70008 (ROHS3 Compliant, 75 Ohms, end-of-life), or 31-321 (ROHS3 Compliant, 50 Ohms). Avoid 31-4702, which is RoHS non-compliant.