VB334 BNC Connector Jack 50 Ohm PCB Equivalent & Substitute Parts

Part Overview

The VB334 is a BNC connector jack (female socket) manufactured by Cinch Connectivity Solutions, designed for 50 ohm coaxial applications with through-hole solder termination on printed circuit boards. This connector operates at frequencies up to 4 GHz and is rated for 500 volts with 500 mating cycles. The part is currently active and RoHS compliant, making it suitable for modern electronic assemblies requiring RF connectivity.

Equivalent and substitute parts are necessary when the primary part is unavailable, when alternative manufacturers are preferred for supply chain optimization, or when design requirements allow for compatible alternatives that meet the same electrical and mechanical specifications.

Key Parameters

Parameter	VB334 Specification
Connector Style	BNC
Connector Type	Jack, Female Socket
Impedance	50 Ohms
Mounting Type	Through Hole
Contact Termination	Solder
Shield Termination	Solder
Fastening Type	Bayonet Lock
Frequency - Max	4 GHz
Number of Ports	1
Voltage Rating	500 V
Mating Cycles	500
Insertion Loss	0.2 dB
Operating Temperature	-65°C ~ 165°C
Dielectric Material	Polytetrafluoroethylene (PTFE)
Body Material	Brass
Housing Color	Silver
RoHS Status	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the VB334 are qualified based on strict electrical and mechanical parameter matching. All substitute parts must maintain the following critical parameters:

Connector Style: BNC
Connector Type: Jack, Female Socket
Impedance: 50 Ohms
Mounting Type: Through Hole
Contact Termination: Solder
Shield Termination: Solder
Fastening Type: Bayonet Lock
Frequency - Max: 4 GHz
Number of Ports: 1
Voltage Rating: 500 V
Mating Cycles: 500
Insertion Loss: 0.2 dB

Substitute parts are grouped into two categories:

Category 1: Direct Cinch Connectivity Solutions Variants (VB334N, VB335) — Same manufacturer with identical electrical performance and minor material finish variations.

Category 2: Cross-Manufacturer Equivalents (Amphenol RF 112404, 112406, 112515, 112553; Pomona Electronics 4578) — Alternative manufacturers meeting identical electrical specifications and mechanical compatibility.

Category 3: Legacy Status (112538) — Marked as "Not For New Designs" but electrically equivalent with dielectric material variation (PBT vs. PTFE).

Parameter Comparison

Part Number	Manufacturer	Connector Style	Connector Type	Impedance	Mounting Type	Frequency - Max	Voltage Rating	Mating Cycles	Insertion Loss	Body Finish	Center Contact Material	Dielectric Material	Product Status	RoHS Status
VB334	Cinch Connectivity Solutions	BNC	Jack, Female Socket	50 Ohms	Through Hole	4 GHz	500 V	500	0.2 dB	Silver	Brass	PTFE	Active	RoHS Compliant
VB334N	Cinch Connectivity Solutions	BNC	Jack, Female Socket	50 Ohms	Through Hole	4 GHz	500 V	500	0.2 dB	Nickel	Brass	PTFE	Active	RoHS Compliant
VB335	Cinch Connectivity Solutions	BNC	Jack, Female Socket	50 Ohms	Through Hole	4 GHz	500 V	500	0.2 dB	Tin	Brass	PTFE	Active	ROHS3 Compliant
112404	Amphenol RF	BNC	Jack, Female Socket	50 Ohms	Through Hole	4 GHz	500 V	500	0.2 dB	Nickel	Phosphor Bronze	PTFE	Active	ROHS3 Compliant
112406	Amphenol RF	BNC	Jack, Female Socket	50 Ohms	Through Hole	4 GHz	500 V	500	0.2 dB	Nickel	Phosphor Bronze	PTFE	Active	ROHS3 Compliant
112515	Amphenol RF	BNC	Jack, Female Socket	50 Ohms	Through Hole	4 GHz	500 V	500	0.2 dB	Nickel	Phosphor Bronze	PTFE	Active	ROHS3 Compliant
112553	Amphenol RF	BNC	Jack, Female Socket	50 Ohms	Through Hole	4 GHz	500 V	500	0.2 dB	Nickel	Phosphor Bronze	PTFE	Active	ROHS3 Compliant
112538	Amphenol RF	BNC	Jack, Female Socket	50 Ohms	Through Hole	4 GHz	500 V	500	0.2 dB	Nickel	Phosphor Bronze	PBT	Not For New Designs	ROHS3 Compliant
4578	Pomona Electronics	BNC	Jack, Female Socket	50 Ohms	Through Hole	4 GHz	500 V	500	0.2 dB	Nickel	Beryllium Copper	PTFE	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status, Current Compliance):

VB334N and VB335 are direct Cinch Connectivity Solutions variants with identical electrical performance. Both are active products with current RoHS compliance. VB334N features a nickel body finish, while VB335 uses tin finish. Both maintain PTFE dielectric material and are suitable for new designs.

Amphenol RF parts 112404, 112406, 112515, and 112553 are cross-manufacturer equivalents with active product status and ROHS3 compliance. These parts use phosphor bronze center contact material instead of brass, maintaining identical electrical specifications and mechanical compatibility. All four are qualified for new designs.

Pomona Electronics 4578 is an active alternative with beryllium copper center contact material and ROHS3 compliance, suitable for applications requiring this specific contact material composition.

Legacy Substitute (Not For New Designs):

Amphenol RF 112538 is marked as "Not For New Designs" and uses polybutylene terephthalate (PBT) dielectric material instead of PTFE. This part remains electrically equivalent but should not be selected for new circuit board designs.

Frequently Asked Questions (FAQ)

Q: Can VB334N and VB335 be used interchangeably with VB334?

A: Yes. VB334N and VB335 are direct Cinch Connectivity Solutions variants with identical electrical specifications, impedance, frequency response, and mechanical mounting. The only differences are body finish materials (nickel for VB334N, tin for VB335, silver for VB334), which do not affect RF performance or connector function.

Q: Are Amphenol RF parts electrically equivalent to the VB334?

A: Yes. Amphenol RF parts 112404, 112406, 112515, and 112553 maintain identical impedance (50 ohms), frequency rating (4 GHz), voltage rating (500 V), mating cycles (500), and insertion loss (0.2 dB). The center contact material differs (phosphor bronze vs. brass), but this does not affect electrical performance within the specified parameters.

Q: What is the difference between PTFE and PBT dielectric materials?

A: Both materials are used in RF connectors. PTFE (polytetrafluoroethylene) is the dielectric material in VB334, VB334N, VB335, and most substitute parts. Amphenol RF 112538 uses PBT (polybutylene terephthalate) as the dielectric. Both materials support the same electrical specifications for this connector class. However, 112538 is marked "Not For New Designs," indicating it should not be selected for new applications.

Q: Does body finish (silver, nickel, tin) affect RF performance?

A: No. Body finish is a cosmetic and corrosion-resistance specification. All VB334 variants (VB334, VB334N, VB335) and cross-manufacturer equivalents maintain identical RF performance regardless of finish material.

Q: Can I use Pomona Electronics 4578 as a substitute?

A: Yes. Pomona Electronics 4578 is an active product with identical electrical and mechanical specifications. The beryllium copper center contact material is an alternative to brass but maintains the same performance within the specified parameters.

Q: Why is Amphenol RF 112538 marked "Not For New Designs"?

A: Parts marked "Not For New Designs" are typically legacy products being phased out by manufacturers. While 112538 remains electrically equivalent, it should not be selected for new circuit board designs. Active alternatives such as 112404, 112406, 112515, or 112553 are recommended instead.

Q: Are all substitute parts RoHS compliant?

A: VB334 is RoHS Compliant. VB334N, VB335, and all Amphenol RF parts (112404, 112406, 112515, 112553, 112538) are ROHS3 Compliant. Pomona Electronics 4578 is ROHS3 Compliant. All parts meet current RoHS requirements for new designs.

Q: What packaging formats are available?

A: VB334, VB334N, and Pomona Electronics 4578 are supplied in Bulk packaging. Amphenol RF parts (112404, 112406, 112515, 112553, 112538) are supplied in Bag packaging. Packaging format does not affect connector performance or compatibility.

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