Amphenol RF 31-71033 BNC Connector Plug 75 Ohm Crimp Equivalent & Substitute Parts

Part Overview

The Amphenol RF 31-71033 is a BNC connector plug with male pin configuration, designed for 75 ohm coaxial cable termination using crimp contact technology. This component is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. The connector features free-hanging (in-line) mounting with bayonet lock fastening, suitable for RF applications up to 4 GHz. Identifying equivalent and substitute parts is necessary for legacy system maintenance, repair operations, and applications where 75 ohm impedance matching is required.

Key Parameters

Parameter	Value
Manufacturer Part Number	31-71033
Manufacturer	Amphenol RF
Connector Style	BNC
Connector Type	Plug, Male Pin
Impedance	75 Ohms
Contact Termination	Crimp
Shield Termination	Crimp
Mounting Type	Free Hanging (In-Line)
Fastening Type	Bayonet Lock
Frequency - Max	4 GHz
Voltage Rating	500 V
Operating Temperature	-65°C ~ 165°C
Impedance Matching	75 Ohms (video/broadcast standard)

Substitute Part Grouping Explanation

Substitute parts for the 31-71033 are classified into two categories based on electrical and mechanical compatibility:

Direct Electrical Equivalents (75 Ohm Impedance Match): Parts that maintain identical impedance (75 ohms), connector style (BNC plug), contact termination (crimp), and mounting configuration (free-hanging in-line). These parts are interchangeable in applications where the original 31-71033 was specified.

Parametric Equivalents (50 Ohm Impedance Variation): The part 031-325 shares all mechanical and termination characteristics but operates at 50 ohm impedance. This part is listed as a parametric equivalent and is not suitable for direct substitution in 75 ohm systems without impedance matching considerations.

Key Substitution Criteria:

Connector Style: BNC (bayonet lock fastening)
Connector Type: Plug, Male Pin
Contact Termination: Crimp
Shield Termination: Crimp
Mounting Type: Free Hanging (In-Line)
Impedance: 75 Ohms (for direct substitution)
Voltage Rating: 500 V minimum
Mating Cycles: 500 minimum

Parameter Comparison

Part Number	Manufacturer	Impedance	Frequency Max	Operating Temp	Voltage Rating	Product Status	RoHS Status	Insertion Loss
31-71033	Amphenol RF	75 Ohm	4 GHz	-65°C ~ 165°C	500 V	Not For New Designs	ROHS3 Compliant	0.2 dB
112950	Amphenol RF	75 Ohm	4 GHz	Not Specified	500 V	Active	ROHS3 Compliant	Not Specified
031-70229-1001	Amphenol RF	75 Ohm	4 GHz	-65°C ~ 165°C	500 V	Active	ROHS3 Compliant	0.2 dB
031-80105	Amphenol RF	75 Ohm	4 GHz	-65°C ~ 165°C	500 V	Active	ROHS3 Compliant	0.2 dB
1-221185-5	TE Connectivity AMP Connectors	75 Ohm	2 GHz	-55°C ~ 85°C	500 V	Active	RoHS non-compliant	0.15 dB
SBC1164B	Winchester Interconnect	75 Ohm	1 GHz	Not Specified	500 V	Active	RoHS Compliant	0.2 dB
SBC1167B	Winchester Interconnect	75 Ohm	1 GHz	Not Specified	500 V	Active	RoHS Compliant	0.2 dB
SBC1865A	Winchester Interconnect	75 Ohm	1 GHz	Not Specified	500 V	Active	RoHS Compliant	0.2 dB
SBC8218	Winchester Interconnect	75 Ohm	1 GHz	Not Specified	500 V	Active	RoHS Compliant	0.2 dB
UPL220-009	Cinch Connectivity Solutions Trompeter	75 Ohm	4 GHz	-65°C ~ 165°C	500 V	Active	ROHS3 Compliant	Not Specified
031-325	Amphenol RF	50 Ohm	4 GHz	-65°C ~ 165°C	500 V	Active	ROHS3 Compliant	0.2 dB

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Amphenol RF Active Products):

The parts 112950, 031-70229-1001, and 031-80105 are active Amphenol RF products maintaining full electrical and mechanical compatibility with the 31-71033. These connectors preserve the 75 ohm impedance, 4 GHz frequency capability, and crimp termination method. Parts 031-70229-1001 and 031-80105 additionally specify the full operating temperature range (-65°C ~ 165°C) matching the original component. All three are ROHS3 compliant, suitable for applications requiring regulatory compliance.

Tier 2 - Frequency-Limited Substitutes (Multi-Manufacturer Options):

The Winchester Interconnect connectors (SBC1164B, SBC1167B, SBC1865A, SBC8218) and TE Connectivity part 1-221185-5 maintain 75 ohm impedance and crimp termination but operate at reduced maximum frequencies (1 GHz or 2 GHz). These parts are suitable for applications where the RF signal bandwidth does not exceed their specified frequency limits. Winchester products are RoHS compliant. The TE Connectivity part 1-221185-5 is RoHS non-compliant and operates at a reduced temperature range (-55°C ~ 85°C).

Tier 3 - Broadband Equivalent (Cinch Connectivity Solutions):

The UPL220-009 from Cinch Connectivity Solutions Trompeter maintains the 4 GHz frequency capability and full operating temperature range of the original part. This connector is ROHS3 compliant and suitable for broadband RF applications.

Impedance Variation:

The part 031-325 operates at 50 ohm impedance and is not suitable for direct substitution in 75 ohm systems. This part is listed as a parametric equivalent only and requires system-level impedance analysis before application.

Frequently Asked Questions (FAQ)

Q: Can I use a 50 ohm BNC connector (031-325) in place of the 75 ohm 31-71033?

A: No. The 031-325 operates at 50 ohm impedance while the 31-71033 is specified for 75 ohm systems. Direct substitution will cause impedance mismatch and signal reflection. The 50 ohm connector is listed as a parametric equivalent for reference only.

Q: What is the difference between the Amphenol RF active substitutes (112950, 031-70229-1001, 031-80105)?

A: All three maintain 75 ohm impedance, 4 GHz frequency capability, and crimp termination. The 112950 does not specify operating temperature range or insertion loss. The 031-70229-1001 and 031-80105 both specify the full -65°C ~ 165°C operating range and 0.2 dB insertion loss. The 031-80105 uses phosphor bronze body material while 031-70229-1001 uses brass.

Q: Can I use Winchester Interconnect connectors (SBC series) in high-frequency applications?

A: Winchester connectors are rated to 1 GHz maximum frequency. Applications requiring 4 GHz operation must use Amphenol RF parts (112950, 031-70229-1001, 031-80105) or Cinch Connectivity Solutions UPL220-009.

Q: Are all substitute parts RoHS compliant?

A: Most substitutes are RoHS compliant. The exception is TE Connectivity part 1-221185-5, which is RoHS non-compliant. Amphenol RF and Winchester Interconnect substitutes are ROHS3 compliant.

Q: What is the difference between packaging types (Bulk vs. Bag)?

A: Packaging type does not affect electrical or mechanical performance. The 31-71033 is supplied in Bulk packaging. The 112950 is supplied in Bag packaging. Both contain the same connector specifications.

Q: Which substitute part has the lowest insertion loss?

A: The TE Connectivity part 1-221185-5 specifies 0.15 dB insertion loss, lower than the 0.2 dB of the original 31-71033. However, this part operates at 2 GHz maximum frequency and is RoHS non-compliant.

Q: Can I use the UPL220-009 as a direct replacement for the 31-71033?

A: Yes. The UPL220-009 maintains 75 ohm impedance, 4 GHz frequency capability, -65°C ~ 165°C operating temperature, and crimp termination. It is ROHS3 compliant and suitable for direct substitution in broadband RF applications.

Q: What cable groups are compatible with the 31-71033 and its substitutes?

A: The 31-71033 is compatible with AT&T 735, 735A, and Belden 735A1 cables. Amphenol RF substitutes maintain this compatibility. Winchester and TE Connectivity parts are compatible with different cable groups (Belden 1164A, 1167A, 1164B, 1167B, 1865A, 8218) and should be verified against specific cable specifications before application.

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