Amphenol RF 031-5506 BNC Connector Jack — Equivalent & Substitute Parts

Part Overview

The Amphenol RF 031-5506 is a BNC connector jack (female socket) rated for 50 ohms impedance, designed for panel mount, through-hole, right-angle solder applications. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The connector operates across a frequency range up to 4 GHz with a 500 V voltage rating and supports 500 mating cycles. Active alternatives from Amphenol RF and other manufacturers provide equivalent electrical and mechanical performance for direct substitution in PCB-based RF applications.

Key Parameters

Parameter	031-5506 Specification
Connector Style	BNC
Connector Type	Jack, Female Socket
Impedance	50 Ohms
Mounting Type	Panel Mount, Through Hole, Right Angle
Contact Termination	Solder
Shield Termination	Solder
Fastening Type	Bayonet Lock
Frequency - Max	4 GHz
Voltage Rating	500 V
Operating Temperature	-65°C ~ 165°C
Mating Cycles	500
Insertion Loss	0.2 dB
Body Material	Zinc Die Cast
Body Finish	Nickel
Center Contact Material	Phosphor Bronze
Center Contact Plating	Gold
Dielectric Material	Polytetrafluoroethylene (PTFE)
Housing Color	Silver
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 031-5506 is determined by strict equivalence across the following critical parameters:

Connector style (BNC) and type (Jack, Female Socket)
Impedance (50 Ohms)
Mounting configuration (Panel Mount, Through Hole, Right Angle)
Contact and shield termination method (Solder)
Fastening mechanism (Bayonet Lock)
Frequency capability (4 GHz maximum)
Voltage rating (500 V)
Mating cycle rating (500 cycles)

Substitute parts are grouped into two categories:

Parametric Equivalents (Amphenol RF 031-6121, TE Connectivity 5227433-1, 5227661-1, 5227676-1, 5227677-1, and TE Connectivity 227676-2): These parts match all critical electrical and mechanical parameters. Variations exist in center contact material (Beryllium Copper vs. Phosphor Bronze), center contact plating (Gold vs. Tin), dielectric material (PTFE vs. Polymethylpentene), and operating temperature range. These differences do not affect substitution eligibility within the specified parameter set.

Similar Equivalent (Pomona Electronics 4788): This part matches all critical parameters except mounting feature designation. It is classified as a through-hole, right-angle connector without explicit panel mount bulkhead notation, though it maintains electrical and mechanical compatibility.

Parameter Comparison

Parameter	031-5506	031-6121	4788	227676-2	5227433-1	5227661-1	5227676-1	5227677-1
Manufacturer	Amphenol RF	Amphenol RF	Pomona Electronics	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity
Connector Style	BNC	BNC	BNC	BNC	BNC	BNC	BNC	BNC
Connector Type	Jack, Female Socket	Jack, Female Socket	Jack, Female Socket	Jack, Female Socket	Jack, Female Socket	Jack, Female Socket	Jack, Female Socket	Jack, Female Socket
Impedance	50 Ohms	50 Ohms	50 Ohms	50 Ohms	50 Ohms	50 Ohms	50 Ohms	50 Ohms
Mounting Type	Panel Mount, Through Hole, Right Angle	Panel Mount, Through Hole, Right Angle	Through Hole, Right Angle	Panel Mount, Through Hole, Right Angle	Panel Mount, Through Hole, Right Angle	Panel Mount, Through Hole, Right Angle	Panel Mount, Through Hole, Right Angle	Panel Mount, Through Hole, Right Angle
Contact Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Shield Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Fastening Type	Bayonet Lock	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	4 GHz	4 GHz	4 GHz
Voltage Rating	500 V	500 V	500 V	500 V	500 V	500 V	500 V	500 V
Mating Cycles	500	500	Not Specified	500	500	500	500	500
Insertion Loss	0.2 dB	0.2 dB	Not Specified	Not Specified	Not Specified	Not Specified	Not Specified	Not Specified
Operating Temperature	-65°C ~ 165°C	-65°C ~ 165°C	-65°C ~ 165°C	-55°C ~ 85°C	-55°C ~ 85°C	-55°C ~ 85°C	-55°C ~ 85°C	-55°C ~ 85°C
Center Contact Material	Phosphor Bronze	Beryllium Copper	Beryllium Copper	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Center Contact Plating	Gold	Gold	Gold	Gold	Tin	Tin	Gold	Gold
Dielectric Material	PTFE	PTFE	PTFE	PMP	PMP	PMP	PMP	PMP
Body Material	Zinc Die Cast	Zinc Die Cast	Brass	Zinc	Zinc	Zinc	Zinc	Zinc
Body Finish	Nickel	Nickel	Nickel	Nickel	Nickel	Nickel	Nickel	Nickel
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Non-Compliant	RoHS Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Recommendation: Amphenol RF 031-6121

The 031-6121 is the direct parametric equivalent from the original manufacturer. It maintains identical electrical specifications (50 ohms, 4 GHz, 500 V, 0.2 dB insertion loss) and operating temperature range (-65°C to 165°C). The part is active in production with ROHS3 compliance and REACH affected status. This connector includes mounting hardware (1 connector, 1 lockwasher, 1 nut) and is available in bulk packaging with 1290 units in stock.

Secondary Recommendation: TE Connectivity 5227661-1

The 5227661-1 provides parametric equivalence with the highest inventory availability (210,158 units in tube packaging). It maintains all critical electrical and mechanical parameters with ROHS3 compliance and REACH affected status. The operating temperature range is reduced to -55°C to 85°C, which is suitable for most commercial and industrial applications. Center contact plating is tin rather than gold.

Alternative Recommendation: TE Connectivity 5227677-1

The 5227677-1 offers parametric equivalence with gold-plated center contacts and ROHS3 compliance. It is available in bulk packaging with 2402 units in stock. Operating temperature range is -55°C to 85°C. This part is suitable for applications where gold plating is preferred for corrosion resistance.

Conditional Recommendation: Pomona Electronics 4788

The 4788 provides electrical and mechanical compatibility with all critical parameters matched. It differs in mounting feature designation (through-hole, right-angle without explicit panel mount bulkhead notation) and body material (brass instead of zinc die cast). This part is suitable for applications where the mounting configuration is compatible with through-hole, right-angle installation. ROHS3 compliant and REACH unaffected.

Not Recommended: TE Connectivity 227676-2

The 227676-2 is RoHS non-compliant and carries undefined REACH status, making it unsuitable for new designs or applications requiring regulatory compliance documentation.

Frequently Asked Questions (FAQ)

Q: Can I substitute the obsolete 031-5506 with the 031-6121?

A: Yes. The 031-6121 is a direct parametric equivalent from Amphenol RF. It matches all critical electrical and mechanical specifications: 50 ohms impedance, 4 GHz frequency rating, 500 V voltage rating, panel mount through-hole right-angle configuration, bayonet lock fastening, and solder termination. The 031-6121 is active in production and RoHS3 compliant.

Q: What is the difference between the 031-6121 and TE Connectivity substitutes?

A: The 031-6121 maintains the original operating temperature range of -65°C to 165°C and uses PTFE dielectric material. TE Connectivity substitutes (5227433-1, 5227661-1, 5227676-1, 5227677-1) operate across -55°C to 85°C and use polymethylpentene (PMP) dielectric material. All maintain 50 ohms impedance, 4 GHz frequency rating, and 500 V voltage rating. Selection depends on temperature requirements and dielectric material compatibility.

Q: Does the Pomona Electronics 4788 work as a substitute?

A: Yes, with a mounting consideration. The 4788 matches all critical electrical parameters and fastening specifications. It is classified as through-hole, right-angle without explicit panel mount bulkhead notation. If your PCB layout accommodates through-hole, right-angle mounting without requiring a front-side nut bulkhead feature, the 4788 is electrically and mechanically compatible.

Q: What is the difference between gold-plated and tin-plated center contacts?

A: Both gold-plated (031-6121, 5227676-1, 5227677-1) and tin-plated (5227433-1, 5227661-1) center contacts provide electrical conductivity and mating compatibility. Gold plating offers superior corrosion resistance and is preferred in high-reliability applications. Tin plating is suitable for standard commercial and industrial applications. Selection depends on environmental exposure and reliability requirements.

Q: Are all substitute parts RoHS compliant?

A: Most substitutes are RoHS or ROHS3 compliant. The exception is TE Connectivity 227676-2, which is RoHS non-compliant and should not be used in applications requiring regulatory compliance. Amphenol RF 031-6121 is ROHS3 compliant. TE Connectivity 5227661-1 and 5227677-1 are ROHS3 compliant. Pomona Electronics 4788 is ROHS3 compliant.

Q: What packaging options are available?

A: Amphenol RF 031-6121 is supplied in bulk packaging. Pomona Electronics 4788 is supplied in bulk packaging. TE Connectivity parts are supplied in multiple packaging formats: 5227433-1 (bulk), 5227661-1 (tube), 5227676-1 (bulk), and 5227677-1 (bulk). Packaging selection does not affect electrical or mechanical performance.

Q: Can I use a substitute with a narrower operating temperature range?

A: Substitution with a narrower operating temperature range is acceptable if your application operates within the substitute part's temperature limits. The 031-5506 operates -65°C to 165°C. TE Connectivity substitutes operate -55°C to 85°C. If your application requires operation below -55°C or above 85°C, use the 031-6121 or 4788, which maintain the original -65°C to 165°C range.

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