Amphenol RF 112139 BNC Connector Plug Equivalent & Substitute Parts

Part Overview

The Amphenol RF 112139 is a BNC connector plug with male pin configuration, 75 ohm impedance, and crimp termination for the center contact. This component is designed for free hanging (in-line) applications and is compatible with RG-179, 179A, 179B, 187, 187A, Belden 9221, and M17/94-RG179 cable groups. The part is currently marked as "Not For New Designs," indicating that alternative solutions should be evaluated for new applications. Identifying equivalent and substitute parts ensures design flexibility and supply chain continuity.

Key Parameters

Parameter	Value
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
Mating Cycles	500
Operating Temperature	-55°C ~ 85°C
Cable Group Compatibility	RG-179, 179A, 179B, 187, 187A, Belden 9221, M17/94-RG179
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the Amphenol RF 112139 is determined by the following critical parameters:

Primary Substitution Criteria:

Connector style (BNC)
Connector type (Plug, Male Pin)
Impedance (75 Ohms)
Contact termination method (Crimp)
Shield termination method (Crimp)
Mounting type (Free Hanging/In-Line)
Fastening type (Bayonet Lock)
Cable group compatibility (RG-179, 179A, 179B, 187, 187A, Belden 9221, M17/94-RG179)

Secondary Considerations:

Frequency maximum rating
Operating temperature range
Voltage rating
Mating cycle rating
Product status and compliance certifications

Parts are grouped into two categories: Direct Equivalents (matching all primary criteria) and Parametric Equivalents (matching primary criteria with variations in secondary parameters such as dielectric material, body material, or operating temperature range).

Parameter Comparison

Parameter	112139	031-70013	031-80107	112133	112954	031-71013-RFX	031-242-RFX
Manufacturer	Amphenol RF	Amphenol RF	Amphenol RF	Amphenol RF	Amphenol RF	Amphenol RF	Amphenol RF
Connector Style	BNC	BNC	BNC	BNC	BNC	BNC	BNC
Connector Type	Plug, Male Pin	Plug, Male Pin	Plug, Male Pin	Plug, Male Pin	Plug, Male Pin	Plug, Male Pin	Plug, Male Pin
Impedance	75 Ohms	75 Ohms	75 Ohms	75 Ohms	75 Ohms	75 Ohms	50 Ohms
Contact Termination	Crimp	Crimp	Crimp	Crimp	Crimp	Solder	Crimp
Shield Termination	Crimp	Crimp	Crimp	Crimp	Crimp	Crimp	Crimp
Mounting Type	Free Hanging (In-Line)	Free Hanging (In-Line)	Free Hanging (In-Line)	Free Hanging (In-Line)	Free Hanging (In-Line)	Free Hanging (In-Line)	Free Hanging (In-Line)
Fastening Type	Bayonet Lock	Bayonet Lock	Bayonet Lock	Bayonet Lock	Bayonet Lock	Bayonet Lock	Bayonet Lock
Frequency - Max	4 GHz	4 GHz	4 GHz	4 GHz	4 GHz	3 GHz	4 GHz
Voltage Rating	500 V	500 V	500 V	500 V	500 V	500 V	500 V
Mating Cycles	500	500	500	500	500	500	500
Operating Temperature	-55°C ~ 85°C	-65°C ~ 165°C	-65°C ~ 165°C	Not Specified	Not Specified	-40°C ~ 80°C	-65°C ~ 165°C
Dielectric Material	Polyoxymethylene (POM) Acetal	Polytetrafluoroethylene (PTFE)	Polytetrafluoroethylene (PTFE)	Polyoxymethylene (POM) Acetal	Polytetrafluoroethylene (PTFE)	Polyoxymethylene (POM) Acetal	Polyoxymethylene (POM) Acetal
Body Material	Brass	Brass	Phosphor Bronze	Brass	Brass	Brass	Brass
Product Status	Not For New Designs	Active	Active	Active	Not For New Designs	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Bag	Bulk	Bulk	Bag	Bag	Bulk	Bulk

Engineering Selection Recommendations

Direct Equivalents for 112139 (75 Ohm, Crimp Contact Termination):

The following parts are functionally equivalent to the 112139 and maintain all primary substitution criteria:

031-70013: Active product status. Offers extended operating temperature range (-65°C ~ 165°C) and PTFE dielectric material. Suitable for applications requiring enhanced thermal performance.
031-80107: Active product status. Features phosphor bronze body material with PTFE dielectric and extended operating temperature range (-65°C ~ 165°C). Provides alternative material composition while maintaining electrical specifications.
112133: Active product status. Maintains POM acetal dielectric material consistent with the 112139. Recommended for direct replacement in existing designs.

Alternative Termination Method:

031-71013-RFX: Active product status. Differs in contact termination (solder instead of crimp) and operates at reduced maximum frequency (3 GHz versus 4 GHz). Suitable only for applications where solder termination is specified and frequency requirements do not exceed 3 GHz.

Impedance Variant:

031-242-RFX: Active product status. Operates at 50 ohm impedance instead of 75 ohms. Not suitable as a direct substitute unless system impedance requirements change to 50 ohms.

Obsolescence Consideration:

112954: Marked as "Not For New Designs." While functionally equivalent to 112139, this part should not be selected for new applications. Use 112133, 031-70013, or 031-80107 instead.

Frequently Asked Questions (FAQ)

Q: Can I use 031-70013 as a direct replacement for 112139?

A: Yes. The 031-70013 maintains all primary substitution criteria: BNC connector style, plug male pin configuration, 75 ohm impedance, crimp contact and shield termination, free hanging mounting, and bayonet lock fastening. The 031-70013 is an active product with extended operating temperature range and PTFE dielectric material, making it suitable for direct replacement.

Q: What is the difference between 112133 and 031-70013?

A: Both are 75 ohm BNC crimp connectors with equivalent electrical performance. The primary differences are: 031-70013 uses PTFE dielectric material and supports -65°C ~ 165°C operating temperature, while 112133 uses POM acetal dielectric with unspecified operating temperature range. The 031-70013 is preferred for applications requiring extended thermal performance.

Q: Why is 031-71013-RFX listed as a substitute if it uses solder termination?

A: The 031-71013-RFX is a parametric equivalent that differs in contact termination method. It is listed as an alternative only for applications where solder termination is required instead of crimp termination. The maximum frequency is reduced to 3 GHz. This part is not suitable for direct replacement in crimp-terminated applications.

Q: Can I use 031-242-RFX instead of 112139?

A: No. The 031-242-RFX operates at 50 ohm impedance, while the 112139 is specified for 75 ohm impedance. These impedance values are not interchangeable. Use 031-242-RFX only if system requirements change to 50 ohm impedance.

Q: Should I use 112954 for new designs?

A: No. The 112954 is marked as "Not For New Designs." For new applications, select 112133, 031-70013, or 031-80107, all of which are active products with current manufacturer support.

Q: What is the difference between bulk and bag packaging?

A: Packaging format does not affect electrical or mechanical compatibility. Bulk packaging (031-70013, 031-80107, 031-71013-RFX, 031-242-RFX) is typically used for high-volume orders, while bag packaging (112139, 112133, 112954) is used for smaller quantities. Select based on procurement requirements and order volume.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All parts listed—112139, 031-70013, 031-80107, 112133, 112954, 031-71013-RFX, and 031-242-RFX—are ROHS3 compliant and REACH affected, meeting current environmental and regulatory requirements.

Q: What cable types are compatible with these connectors?

A: All listed parts are compatible with RG-179, 179A, 179B, 187, 187A, Belden 9221, and M17/94-RG179 cable groups. Cable selection should be based on application impedance requirements (75 ohms for 112139 and most substitutes, 50 ohms for 031-242-RFX).

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