Pomona Electronics 73043 BNC Connector Plug Equivalent & Substitute Parts

Part Overview

The Pomona Electronics 73043 is a BNC connector plug designed for 50-ohm coaxial cable applications. This male pin connector features crimp termination for RG-8, 9, 11, 213, and 214 cable groups, with bayonet lock fastening and a maximum frequency rating of 2 GHz. The part is currently active in production with 831 units in stock.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when design requirements shift to different cable groups, or when higher frequency performance is needed for system upgrades.

Key Parameters

Parameter	Pomona 73043
Connector Style	BNC
Connector Type	Plug, Male Pin
Contact Termination	Crimp
Shield Termination	Crimp
Impedance	50 Ohms
Mounting Type	Free Hanging (In-Line)
Fastening Type	Bayonet Lock
Frequency - Max	2 GHz
Cable Group	RG-8, 9, 11, 213, 214
Body Material	Brass
Body Finish	Nickel
Center Contact Plating	Gold
Dielectric Material	Polytetrafluoroethylene (PTFE)
Mating Cycles	500
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution eligibility for the Pomona 73043 is determined by the following core parameters:

Primary Compatibility Criteria:

Connector style: BNC
Connector type: Plug, Male Pin
Impedance: 50 Ohms
Mounting type: Free Hanging (In-Line)
Fastening type: Bayonet Lock
Shield termination: Crimp

Secondary Compatibility Criteria:

Contact termination: Crimp (primary), or Crimp or Solder (acceptable alternative)
Cable group compatibility: Must support at least one cable group from RG-8, 9, 11, 213, or 214
Body material and finish: Brass with Nickel finish
Center contact plating: Gold
Mating cycles: 500 minimum

Frequency Consideration: Substitute parts with higher maximum frequency ratings (4 GHz or greater) are fully compatible with the 2 GHz requirement of the 73043 and provide enhanced performance margin.

Non-Substitutable Parts: The TNC connector (Amphenol RF 122398) differs in fastening type (threaded vs. bayonet lock) and connector style, making it incompatible despite matching impedance and other parameters.

Parameter Comparison

Part Number	Manufacturer	Connector Style	Contact Termination	Impedance	Frequency Max	Cable Group	Product Status	Voltage Rating	Operating Temperature
73043	Pomona Electronics	BNC	Crimp	50 Ohms	2 GHz	RG-8, 9, 11, 213, 214	Active	Not specified	Not specified
031-326	Amphenol RF	BNC	Crimp or Solder	50 Ohms	4 GHz	RG-55, 142, 223, 400	Active	500 V	-65°C ~ 165°C
031-5998-RFX	Amphenol RF	BNC	Crimp	50 Ohms	4 GHz	Belden 9913, 9914, LMR-400	Not For New Designs	500 V	-65°C ~ 165°C
031-5999-RFX	Amphenol RF	BNC	Crimp	50 Ohms	4 GHz	RG-8, 8A, 9, 9A, 9B, 87, 213, 214, 225, 302, 393	Active	500 V	-65°C ~ 165°C
31-242	Amphenol RF	BNC	Crimp or Solder	50 Ohms	4 GHz	RG-179, 179A, 179B, 187, 187A, Belden 9221, M17/94-RG179	Active	500 V	-65°C ~ 165°C
31-315	Amphenol RF	BNC	Crimp	50 Ohms	4 GHz	RG-174, 188, 188A, 316, LMR-100, M17/119-RG174	Active	500 V	-65°C ~ 165°C
31-315-RFX	Amphenol RF	BNC	Crimp	50 Ohms	4 GHz	RG-174, 188, 188A, 316, LMR-100, M17/119-RG174	Active	500 V	-65°C ~ 165°C
31-320-RFX	Amphenol RF	BNC	Crimp or Solder	50 Ohms	4 GHz	RG-58, 58A, 58B, 58C, 141, 303, LMR-195, Belden B7806A, 9907	Active	500 V	-40°C ~ 85°C
31-321-1000	Amphenol RF	BNC	Crimp	50 Ohms	4 GHz	RG-59 Double Braid, Belden 9231	Not For New Designs	500 V	-65°C ~ 165°C
31-5556-RFX	Amphenol RF	BNC	Push On	50 Ohms	4 GHz	RG-59, 59B, 62, 140, 210, Belden 8241, 8263, 8279, 9209	Active	500 V	-65°C ~ 165°C

Engineering Selection Recommendations

Direct Substitutes (Active Status, Crimp Termination):

Amphenol RF 031-5999-RFX is the primary substitute for the Pomona 73043. This part maintains identical connector style, impedance, and fastening type while supporting the full cable group range of the original part (RG-8, 8A, 9, 9A, 9B, 87, 213, 214, 225, 302, 393). The 4 GHz frequency rating exceeds the 2 GHz requirement. Both parts are ROHS3 compliant and REACH affected. This part is listed in the 73043 substitute field.

Amphenol RF 31-315-RFX provides an alternative for applications using smaller diameter cables (RG-174, 188, 188A, 316, LMR-100). This part is active and meets all core compatibility criteria.

Alternative Substitutes (Active Status, Crimp or Solder Termination):

Amphenol RF 031-326 and 31-242 accept both crimp and solder termination, providing flexibility in assembly methods. Both are active products with 4 GHz frequency ratings. Cable group compatibility differs from the 73043, requiring verification against specific application requirements.

Amphenol RF 31-320-RFX supports RG-58 series cables with crimp or solder termination. Operating temperature range is -40°C ~ 85°C, which is narrower than other substitutes.

Parts Not Recommended for New Designs:

Amphenol RF 031-5998-RFX and 31-321-1000 carry "Not For New Designs" status and should be avoided for new applications despite technical compatibility.

Non-Compatible Parts:

Amphenol RF 122398 (TNC connector) is not a substitute due to different fastening type (threaded vs. bayonet lock) and connector style.

Frequently Asked Questions (FAQ)

Q: Can I use Amphenol RF 031-5999-RFX as a direct replacement for Pomona 73043?

A: Yes. Both parts are BNC plug connectors with 50-ohm impedance, crimp termination, and bayonet lock fastening. The 031-5999-RFX supports all cable groups of the 73043 (RG-8, 9, 213, 214) plus additional groups. The 4 GHz frequency rating exceeds the 2 GHz requirement. Both are ROHS3 compliant.

Q: What is the difference between crimp and crimp or solder termination?

A: Crimp-only parts (031-5999-RFX, 31-315-RFX) require mechanical crimping for assembly. Crimp or solder parts (031-326, 31-242, 31-320-RFX) allow either crimping or soldering, providing assembly flexibility. The 73043 specifies crimp termination only.

Q: Can I use 31-5556-RFX (push-on termination) instead of the 73043?

A: No. The 31-5556-RFX uses push-on contact termination rather than crimp. This represents a different assembly method and is not a direct substitute for crimp-terminated applications.

Q: Why do some substitutes support different cable groups?

A: BNC connectors are designed for specific cable diameters and impedance characteristics. The 73043 supports larger diameter cables (RG-8, 9, 11, 213, 214). Substitutes like 31-315-RFX are optimized for smaller cables (RG-174, 188). Cable group compatibility must match your specific application requirements.

Q: What does "Not For New Designs" mean?

A: Parts marked "Not For New Designs" (031-5998-RFX, 31-321-1000) are legacy products still available but not recommended for new circuit designs. Use active-status alternatives for new applications.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the 73043 environmental certification.

Q: What is the difference between the 73043 and 031-5999-RFX in terms of frequency performance?

A: The 73043 is rated to 2 GHz maximum frequency. The 031-5999-RFX is rated to 4 GHz. The higher rating of the substitute provides additional performance margin and is suitable for applications requiring the 2 GHz specification of the original part.

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