Amphenol RF 031-71016 BNC Connector Jack Equivalent & Substitute Parts

Part Overview

The Amphenol RF 031-71016 is an active BNC connector jack designed for 75 ohm coaxial applications. This female socket connector features panel mount installation with bayonet lock fastening and crimp termination for both center contact and shield. The connector supports cable groups RG-179, 179A, 179B, 187, 187A, Belden 9221, and M17/94-RG179 with a maximum frequency rating of 4 GHz and 500 volt rating. Equivalent and substitute parts are identified to provide alternative sourcing options when the primary part number is unavailable or when specific application requirements necessitate alternative specifications.

Key Parameters

Parameter	Specification
Connector Style	BNC
Connector Type	Jack, Female Socket
Impedance	75 Ohms
Contact Termination	Crimp
Shield Termination	Crimp
Mounting Type	Panel Mount
Mounting Feature	Bulkhead - Front Side Nut
Fastening Type	Bayonet Lock
Frequency - Max	4 GHz
Voltage Rating	500 V
Mating Cycles	500
Insertion Loss	0.2 dB
Body Material	Brass
Body Finish	Nickel
Center Contact Plating	Gold
Dielectric Material	Polytetrafluoroethylene (PTFE)
RoHS Status	ROHS3 Compliant
REACH Status	REACH Affected

Substitute Part Grouping Explanation

Substitute parts for the Amphenol RF 031-71016 are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents (Direct Substitutes): Parts 031-71016-RFX maintain identical electrical specifications including 75 ohm impedance, 4 GHz maximum frequency, 500 volt rating, and 0.2 dB insertion loss. These parts share the same BNC jack female socket configuration with panel mount bulkhead installation and bayonet lock fastening. Parametric equivalents differ only in packaging format, included component quantities, dielectric material composition, or center contact material while maintaining full functional compatibility.

Similar Substitutes (Impedance-Matched Alternatives): Part 5221221-5 from TE Connectivity AMP Connectors provides 75 ohm impedance matching with identical connector style, type, and mounting configuration. This substitute operates at a reduced maximum frequency of 2 GHz and features different center contact material (beryllium copper versus brass/phosphor bronze) and dielectric material (polyethylene versus PTFE). The insertion loss specification of 0.15 dB is superior to the main part.

Non-Equivalent Alternatives (Different Impedance): Parts 031-245 and 031-245-RFX are 50 ohm impedance connectors and are not suitable for direct substitution in 75 ohm applications despite sharing identical connector style, mounting type, and fastening mechanism.

Parameter Comparison

Parameter	031-71016	031-71016-RFX	5221221-5	031-245	031-245-RFX
Manufacturer	Amphenol RF	Amphenol RF	TE Connectivity AMP	Amphenol RF	Amphenol RF
Connector Style	BNC	BNC	BNC	BNC	BNC
Connector Type	Jack, Female Socket	Jack, Female Socket	Jack, Female Socket	Jack, Female Socket	Jack, Female Socket
Impedance	75 Ohms	75 Ohms	75 Ohms	50 Ohms	50 Ohms
Contact Termination	Crimp	Crimp	Crimp	Crimp	Crimp
Shield Termination	Crimp	Crimp	Crimp	Crimp	Crimp
Mounting Type	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount
Mounting Feature	Bulkhead - Front Side Nut	Bulkhead - Front Side Nut	Bulkhead - Front Side Nut	Bulkhead - Front Side Nut	Bulkhead - Front Side Nut
Fastening Type	Bayonet Lock	Bayonet Lock	Bayonet Lock	Bayonet Lock	Bayonet Lock
Frequency - Max	4 GHz	4 GHz	2 GHz	4 GHz	4 GHz
Voltage Rating	500 V	500 V	500 V	500 V	500 V
Mating Cycles	500	500	500	500	500
Insertion Loss	0.2 dB	0.2 dB	0.15 dB	0.2 dB	0.2 dB
Body Material	Brass	Brass	Zinc	Brass	Brass
Body Finish	Nickel	Nickel	Nickel	Nickel	Nickel
Center Contact Plating	Gold	Gold	Gold	Gold	Gold
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Affected	REACH Affected	REACH Affected	REACH Affected	REACH Affected

Engineering Selection Recommendations

Direct Substitution (031-71016-RFX): The Amphenol RF 031-71016-RFX is a parametric equivalent suitable for direct substitution in applications requiring 75 ohm impedance BNC jack connectors. Both parts maintain ROHS3 compliance and REACH affected status. The primary difference is packaging format and included component quantities. Selection of 031-71016-RFX is appropriate when the original part is unavailable and identical electrical performance is required.

Frequency-Limited Substitution (5221221-5): The TE Connectivity AMP Connectors 5221221-5 provides 75 ohm impedance matching and maintains all mechanical compatibility parameters. However, the maximum frequency rating of 2 GHz is reduced compared to the 4 GHz specification of the main part. This substitute is suitable only for applications operating below 2 GHz. The superior insertion loss specification of 0.15 dB provides a performance advantage in signal integrity. RoHS compliance status differs (RoHS Compliant versus ROHS3 Compliant).

Non-Suitable Alternatives (031-245 and 031-245-RFX): The 50 ohm impedance specifications of parts 031-245 and 031-245-RFX make these unsuitable for direct substitution in 75 ohm system applications. Impedance mismatch will result in signal reflections and system performance degradation.

Frequently Asked Questions (FAQ)

Q: Can the 031-71016-RFX be used as a direct replacement for the 031-71016?

A: Yes. The 031-71016-RFX maintains identical electrical specifications including 75 ohm impedance, 4 GHz maximum frequency, 500 volt rating, and 0.2 dB insertion loss. Both parts feature the same BNC jack female socket configuration with panel mount bulkhead installation and bayonet lock fastening. Differences in packaging format and included component quantities do not affect functional compatibility.

Q: Is the TE Connectivity 5221221-5 compatible with 75 ohm systems?

A: The 5221221-5 provides 75 ohm impedance matching and is mechanically compatible with the 031-71016. However, the maximum frequency rating of 2 GHz is lower than the 4 GHz specification of the main part. Selection of this substitute is appropriate only for applications operating below 2 GHz.

Q: Why are the 031-245 and 031-245-RFX parts listed as substitutes if they have different impedance?

A: The 031-245 and 031-245-RFX are listed as related part numbers but are not suitable substitutes for 75 ohm applications. These 50 ohm connectors are included for reference purposes only. Impedance mismatch between the connector and system impedance will cause signal reflections and performance degradation.

Q: What are the key differences between the 031-71016 and 031-71016-RFX?

A: The primary differences are packaging format (the 031-71016 includes 5 components while the 031-71016-RFX includes 7 components) and dielectric material composition (PTFE versus polyoxymethylene acetal). The center contact material differs (brass versus phosphor bronze). All electrical specifications and mechanical mounting parameters remain identical.

Q: Are all substitute parts RoHS compliant?

A: The 031-71016, 031-71016-RFX, 031-245, and 031-245-RFX are ROHS3 compliant. The TE Connectivity 5221221-5 is RoHS compliant. Both compliance levels meet regulatory requirements, though the specific RoHS version differs.

Q: What cable groups are compatible with these BNC connectors?

A: The Amphenol RF parts (031-71016, 031-71016-RFX, 031-245, and 031-245-RFX) support cable groups RG-179, 179A, 179B, 187, 187A, Belden 9221, and M17/94-RG179. The TE Connectivity 5221221-5 supports RG-179, 179A, 179B, 187, and 187A cable groups.

Q: Can the 031-71016 be used in applications requiring frequencies above 2 GHz?

A: Yes. The 031-71016 has a maximum frequency rating of 4 GHz, making it suitable for applications up to this frequency. The TE Connectivity 5221221-5 substitute is limited to 2 GHz maximum frequency and would not be appropriate for higher frequency applications.

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