Amphenol RF 112543 BNC Connector Jack Equivalent & Substitute Parts

Part Overview

The Amphenol RF 112543 is a BNC connector jack (female socket) rated for 75 ohms impedance, designed for through-hole PCB mounting with solder termination. This coaxial RF connector operates at frequencies up to 4 GHz and is rated for 500 volts with 500 mating cycles. The part is currently active in production and ROHS3 compliant.

Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design alternatives where impedance matching, frequency response, and electrical specifications align with application requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	112543
Manufacturer	Amphenol RF
Category	Coaxial Connectors (RF)
Connector Style	BNC
Connector Type	Jack, Female Socket
Impedance	75 Ohms
Frequency - Max	4 GHz
Mounting Type	Through Hole
Contact Termination	Solder
Shield Termination	Solder
Fastening Type	Bayonet Lock
Voltage Rating	500 V
Mating Cycles	500
Number of Ports	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the Amphenol RF 112543 are grouped based on the following substitution criteria:

Primary Substitution Category: 75 Ohm Impedance Equivalents

Parts that maintain the same 75 ohm impedance specification are direct functional equivalents:

Amphenol RF 031-5329-72RFX
Rosenberger 71K101-400A5

These parts share identical impedance, connector style (BNC jack), mounting type (through-hole solder), frequency rating (4 GHz), voltage rating (500 V), and mating cycles (500). They are suitable for direct substitution in applications requiring 75 ohm RF transmission line matching.

Secondary Substitution Category: 50 Ohm Impedance Alternatives

Parts rated for 50 ohm impedance represent a different impedance class and are listed as alternatives only where system design permits impedance conversion or where 50 ohm systems are specified:

Amphenol RF 031-5329-51RFX
Amphenol RF 031-5329-52RFX
TE Connectivity 1-1337445-0
TE Connectivity 227699-1
TE Connectivity 5221123-2
TE Connectivity 5222420-1
TE Connectivity 5413969-2
TE Connectivity 6274315-1

These parts share connector style (BNC jack), mounting type (through-hole solder), frequency rating (4 GHz), voltage rating (500 V), and mating cycles (500), but operate at 50 ohm impedance and are not direct substitutes for 75 ohm applications.

Key Parameters Determining Substitution:

Impedance (75 Ohms vs. 50 Ohms)
Connector Style (BNC)
Connector Type (Jack, Female Socket)
Mounting Type (Through Hole)
Contact and Shield Termination (Solder)
Frequency Rating (4 GHz maximum)
Voltage Rating (500 V)
Mating Cycles (500)
Fastening Type (Bayonet Lock)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance (Ohms)	Connector Type	Mounting Type	Frequency - Max (GHz)	Voltage Rating (V)	Mating Cycles	Center Contact Material	Body Material	RoHS Status	Product Status
112543	Amphenol RF	75	Jack, Female Socket	Through Hole	4	500	500	Phosphor Bronze	Brass	ROHS3 Compliant	Active
031-5329-72RFX	Amphenol RF	75	Jack, Female Socket	Through Hole	4	500	500	Phosphor Bronze	Brass	ROHS3 Compliant	Active
71K101-400A5	Rosenberger	75	Jack, Female Socket	Through Hole	4	400	500	Beryllium Copper	Brass	RoHS Compliant	Active
031-5329-51RFX	Amphenol RF	50	Jack, Female Socket	Through Hole	4	500	500	Phosphor Bronze	Brass	ROHS3 Compliant	Active
031-5329-52RFX	Amphenol RF	50	Jack, Female Socket	Through Hole	4	500	500	Phosphor Bronze	Brass	ROHS3 Compliant	Active
1-1337445-0	TE Connectivity AMP Connectors	50	Jack, Female Socket	Through Hole	4	500	500	Brass	Brass	ROHS3 Compliant	Active
227699-1	TE Connectivity AMP Connectors	50	Jack, Female Socket	Through Hole	4	500	500	Phosphor Bronze	Zinc	RoHS Compliant	Active
5221123-2	TE Connectivity AMP Connectors	50	Jack, Female Socket	Through Hole	4	500	500	Phosphor Bronze	Zinc	ROHS3 Compliant	Active
5222420-1	TE Connectivity AMP Connectors	50	Jack, Female Socket	Through Hole	4	500	500	Phosphor Bronze	Brass	RoHS Compliant	Active
5413969-2	TE Connectivity AMP Connectors	50	Jack, Female Socket	Through Hole	4	500	500	Beryllium Copper	Zinc	ROHS3 Compliant	Active
6274315-1	TE Connectivity AMP Connectors	50	Jack, Female Socket	Through Hole	4	500	500	Phosphor Bronze	Zinc	ROHS3 Compliant	Active

Engineering Selection Recommendations

Direct Substitution (75 Ohm Impedance):

The Amphenol RF 031-5329-72RFX is a direct functional equivalent to the 112543. Both parts are manufactured by Amphenol RF, rated for 75 ohm impedance, and carry ROHS3 compliance. This part is suitable for direct substitution in applications where 75 ohm impedance matching is required.

The Rosenberger 71K101-400A5 is also a 75 ohm equivalent. This part differs in voltage rating (400 V versus 500 V) and carries RoHS compliance rather than ROHS3. Selection of this part requires verification that the 400 V rating is acceptable for the application.

Alternative Substitution (50 Ohm Impedance):

All remaining substitute parts operate at 50 ohm impedance and represent a different impedance class. These parts are suitable only in applications where 50 ohm impedance is specified or where impedance conversion is designed into the system. Selection of 50 ohm parts for 75 ohm applications will result in impedance mismatch and signal degradation.

Compliance Considerations:

All listed parts maintain active product status. The 112543 and most substitute parts carry ROHS3 compliance. Parts 227699-1 and 5222420-1 carry RoHS compliance without ROHS3 designation. All parts are REACH affected and carry EAR99 ECCN classification.

Frequently Asked Questions (FAQ)

Q: Can I use a 50 ohm BNC connector in place of the 75 ohm 112543?

A: No. The 50 ohm and 75 ohm impedance ratings are not interchangeable. Using a 50 ohm connector in a 75 ohm system creates impedance mismatch, resulting in signal reflections, insertion loss, and degraded system performance. Impedance must match the transmission line and system design.

Q: What is the difference between the Amphenol RF 112543 and 031-5329-72RFX?

A: Both parts are 75 ohm BNC jacks manufactured by Amphenol RF with identical electrical and mechanical specifications. The primary difference is the part numbering scheme and packaging designation. The 031-5329-72RFX is supplied in bulk packaging, while the 112543 designation may reflect different packaging or distribution channels. Both are suitable for direct substitution.

Q: Why does the Rosenberger 71K101-400A5 have a lower voltage rating?

A: The Rosenberger part is rated for 400 V maximum, compared to 500 V for the Amphenol RF 112543. This difference reflects the design specifications of each manufacturer. Selection of the Rosenberger part requires confirmation that 400 V is acceptable for the application voltage requirements.

Q: Are all substitute parts ROHS3 compliant?

A: No. Most substitute parts carry ROHS3 compliance, but parts 227699-1 and 5222420-1 carry RoHS compliance without ROHS3 designation. If ROHS3 compliance is a requirement, these two parts should not be selected. Verify compliance requirements before part selection.

Q: What is the maximum frequency rating for these connectors?

A: All listed parts, including the 112543 and all substitutes, are rated for maximum frequency of 4 GHz. This rating applies regardless of impedance class (50 ohm or 75 ohm).

Q: Can I mix 75 ohm and 50 ohm connectors in the same system?

A: No. Mixing impedance classes in a single RF system creates impedance discontinuities that cause signal reflections and system performance degradation. All connectors in a transmission line must match the system impedance specification.

Q: What is the difference between center contact materials (Phosphor Bronze vs. Beryllium Copper)?

A: Both materials are used in RF connectors and provide adequate electrical conductivity. Phosphor Bronze offers good spring properties and corrosion resistance. Beryllium Copper provides higher conductivity and spring force. Both materials are acceptable for the electrical specifications of these connectors. Material selection does not affect impedance or frequency rating.

Q: Are through-hole and surface-mount versions of this connector available?

A: All listed parts are through-hole mounted connectors designed for solder termination to PCB pads. No surface-mount versions are included in this substitute list.

Q: What does MSL 1 (Unlimited) mean?

A: Moisture Sensitivity Level 1 (Unlimited) indicates that the connector has minimal moisture sensitivity and does not require special moisture control during storage, handling, or assembly. These parts can be stored and used without moisture-barrier packaging or baking procedures.

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