Amphenol RF 031-326 BNC Connector Plug Equivalent & Substitute Parts

Part Overview

The Amphenol RF 031-326 is a BNC connector plug designed for 50-ohm coaxial cable applications. This male pin connector features crimp or solder termination and operates across a frequency range up to 4 GHz, making it suitable for RF and microwave signal transmission in free-hanging (in-line) configurations. The part is currently active in production with 948 units in stock. Equivalent and substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when design requirements necessitate alternative manufacturers or termination methods.

Substiute Parts

031-326

Amphenol RFIn Stock: 996031-326 Datasheet

Current PartRFQ

031-4427

Amphenol RFIn Stock: 1177031-4427 Datasheet

Parametric EquivalentRFQ

2-329444-2

TE Connectivity AMP ConnectorsIn Stock: 7822-329444-2 Datasheet

DirectRFQ

5227079-6

TE Connectivity AMP ConnectorsIn Stock: 646275227079-6 Datasheet

DirectRFQ

5225395-3

TE Connectivity AMP ConnectorsIn Stock: 9265225395-3 Datasheet

SimilarRFQ

CPMC8813

Cinch Connectivity Solutions AIM-CambridgeIn Stock: 938CPMC8813 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Amphenol RF 031-326 are classified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Core Compatibility Parameters:

• Connector style (BNC)
• Connector type (Plug, Male Pin)
• Impedance (50 Ohms)
• Mounting type (Free Hanging/In-Line)
• Fastening type (Bayonet Lock)
• Frequency capability (minimum 4 GHz)
• Voltage rating (500 V minimum)
• Mating cycles (500 minimum)

Parametric Equivalents share all core electrical and mechanical parameters with the main part. These parts are direct functional replacements within the same performance envelope.

Direct Manufacturer Equivalents meet core parameters but may have variations in termination method, frequency capability, or operating temperature range. These parts are suitable for applications where the specific variation does not conflict with system requirements.

Similar Parts meet core parameters but have product status changes (obsolete) or minor material or dielectric variations. These parts are suitable only when availability of primary equivalents is exhausted and application requirements permit the noted variations.

Parameter Comparison

Engineering Selection Recommendations

Tier 1 - Preferred Substitutes (Active, Full Compliance):

031-4427 (Amphenol RF) is the primary parametric equivalent. This part maintains identical electrical performance, frequency capability, and operating temperature range as the 031-326. Both parts are ROHS3 compliant and active in production. The only variation is body finish (Silver vs. Nickel), which does not affect electrical performance. This part is recommended as the first alternative when 031-326 is unavailable.

5227079-6 (TE Connectivity AMP Connectors) is a direct manufacturer equivalent with active product status and RoHS compliance. This part meets all core electrical parameters including 4 GHz frequency capability and 500 V voltage rating. The operating temperature range is reduced to -55°C ~ 85°C, and the dielectric material is polyethylene (PE) rather than PTFE. This part is suitable for applications operating within the reduced temperature range. High inventory availability (64,520 units) supports supply chain continuity.

CPMC8813 (Cinch Connectivity Solutions AIM-Cambridge) is a parametric equivalent with active product status and RoHS compliance. This part matches the 031-326 in electrical performance, frequency capability, and termination options. The operating temperature range is reduced to -55°C ~ 85°C. Body material is zinc rather than brass. This part is suitable for applications within the reduced temperature specification.

Tier 2 - Limited Substitutes (Obsolete or Reduced Capability):

2-329444-2 (TE Connectivity AMP Connectors) has obsolete product status and RoHS non-compliance. The contact termination is Push On rather than Crimp or Solder, and frequency capability is limited to 2.5 GHz. Operating temperature range is -55°C ~ 85°C. This part is not recommended for new designs. Use only when existing inventory must be consumed and application requirements permit reduced frequency capability and non-compliant RoHS status.

5225395-3 (TE Connectivity AMP Connectors) has obsolete product status but maintains RoHS compliance. Frequency capability and electrical parameters match the 031-326. Operating temperature range is reduced to -55°C ~ 85°C. This part is suitable only for legacy system maintenance or when Tier 1 alternatives are exhausted and application requirements permit obsolete component use.

Frequently Asked Questions (FAQ)

Q: Can 031-4427 be used as a direct replacement for 031-326?

A: Yes. The 031-4427 is a parametric equivalent with identical electrical specifications, frequency response, and operating temperature range. Both parts are ROHS3 compliant and active in production. The body finish differs (Silver vs. Nickel), but this does not affect electrical performance or mechanical compatibility.

Q: What is the key difference between 5227079-6 and 031-326?

A: The 5227079-6 has a reduced operating temperature range (-55°C ~ 85°C vs. -65°C ~ 165°C) and uses polyethylene dielectric material instead of PTFE. Electrical performance, frequency capability, and impedance are identical. This part is suitable for applications operating within the reduced temperature specification.

Q: Why is 2-329444-2 listed as a substitute if it is obsolete?

A: The 2-329444-2 is included for reference and legacy system support only. It meets the core BNC connector specifications but has reduced frequency capability (2.5 GHz vs. 4 GHz), obsolete product status, and RoHS non-compliance. This part should not be used in new designs.

Q: Can CPMC8813 replace 031-326 in all applications?

A: The CPMC8813 is suitable for most applications but has a reduced operating temperature range (-55°C ~ 85°C vs. -65°C ~ 165°C). Applications requiring operation at temperatures below -55°C or above 85°C must use 031-326 or 031-4427. All other electrical and mechanical parameters are compatible.

Q: What is the difference between Crimp and Crimp or Solder termination?

A: Crimp or Solder termination allows the connector to be attached to cable using either crimp tools or solder methods. Crimp-only termination restricts attachment to crimp methods only. The 031-326 and 031-4427 support both methods, while 5227079-6 supports crimp only. Application assembly methods determine which termination type is required.

Q: Are all substitute parts compatible with RG-55, 142, 223, and 400 cable groups?

A: The 031-326, 031-4427, and CPMC8813 are compatible with RG-55, 142, 223, and 400 cable groups. The 5227079-6 and 5225395-3 are compatible with RG-55, 55A, 55B, and 223 cable groups. The 2-329444-2 is compatible with RG-55, 55A, 55B, and 223 cable groups. Verify cable group compatibility with specific application requirements.

Q: What does ROHS3 compliance mean compared to RoHS compliance?

A: ROHS3 refers to compliance with the third iteration of the Restriction of Hazardous Substances directive. Both ROHS3 and RoHS compliant parts meet hazardous substance restrictions. ROHS3 represents the current regulatory standard. Parts marked as RoHS non-compliant do not meet current environmental regulations and should not be used in new designs.

Q: Is inventory availability a factor in part selection?

A: Inventory availability supports supply chain planning but does not determine electrical or mechanical compatibility. The 5227079-6 has significantly higher inventory (64,520 units) compared to other alternatives, which may provide supply chain advantages. However, part selection should prioritize electrical and mechanical compatibility first, then consider inventory as a secondary factor.