TE Connectivity AMP Connectors 330878 BNC Plug Coaxial Connector Equivalent & Substitute Parts

Part Overview

The TE Connectivity AMP Connectors 330878 is a BNC connector plug designed for 50 ohm RF coaxial applications. This male pin connector features crimp termination for both center contact and shield, with a bayonet lock fastening mechanism. The connector is rated for operation across -55°C to 85°C and supports frequencies up to 2.5 GHz with an insertion loss of 0.2 dB. The part is currently active in production with 701 units in stock. Equivalent and substitute parts are identified to provide alternative sourcing options for applications requiring identical or enhanced electrical and mechanical performance characteristics.

Key Parameters

Parameter	Specification
Connector Style	BNC
Connector Type	Plug, Male Pin
Impedance	50 Ohms
Contact Termination	Crimp
Shield Termination	Crimp
Mounting Type	Free Hanging (In-Line)
Fastening Type	Bayonet Lock
Frequency - Max	2.5 GHz
Voltage Rating	500 V
Operating Temperature Range	-55°C ~ 85°C
Insertion Loss	0.2 dB
Mating Cycles	500

Substitute Part Grouping Explanation

Substitute parts for the TE Connectivity 330878 are identified based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Core Matching Parameters:

Connector Style: BNC
Connector Type: Plug, Male Pin
Impedance: 50 Ohms
Contact Termination: Crimp
Shield Termination: Crimp
Mounting Type: Free Hanging (In-Line)
Fastening Type: Bayonet Lock
Voltage Rating: 500 V
Mating Cycles: 500
Insertion Loss: 0.2 dB

Substitute Classification:

Parametric Equivalent (5330878): TE Connectivity AMP Connectors part number 5330878 matches all core electrical parameters and mechanical specifications. This substitute provides identical performance with an extended operating temperature range (-65°C ~ 85°C versus -55°C ~ 85°C) and RoHS compliance status, making it suitable for applications requiring regulatory compliance.

Direct Manufacturer Substitute (31-321-1000): Amphenol RF part number 31-321-1000 provides functional equivalence across all critical parameters with enhanced frequency capability (4 GHz versus 2.5 GHz) and extended operating temperature range (-65°C ~ 165°C). This part is designated as "Not For New Designs" by the manufacturer, indicating it remains available for legacy system support and replacement applications.

Parameter Comparison

Parameter	330878 (Main Part)	5330878 (Parametric Equivalent)	31-321-1000 (Direct Substitute)
Manufacturer	TE Connectivity AMP Connectors	TE Connectivity AMP Connectors	Amphenol RF
Connector Style	BNC	BNC	BNC
Connector Type	Plug, Male Pin	Plug, Male Pin	Plug, Male Pin
Impedance	50 Ohms	50 Ohms	50 Ohms
Contact Termination	Crimp	Crimp	Crimp
Shield Termination	Crimp	Crimp	Crimp
Mounting Type	Free Hanging (In-Line)	Free Hanging (In-Line)	Free Hanging (In-Line)
Fastening Type	Bayonet Lock	Bayonet Lock	Bayonet Lock
Frequency - Max	2.5 GHz	2.5 GHz	4 GHz
Voltage Rating	500 V	500 V	500 V
Operating Temperature Range	-55°C ~ 85°C	-65°C ~ 85°C	-65°C ~ 165°C
Insertion Loss	0.2 dB	0.2 dB	0.2 dB
Mating Cycles	500	500	500
Center Contact Material	Brass	Brass	Brass
Body Material	Brass	Brass	Brass
Center Contact Plating	Gold	Gold	Gold
Dielectric Material	Polypropylene (PP)	Polypropylene (PP)	Polytetrafluoroethylene (PTFE)
Product Status	Active	Active	Not For New Designs
RoHS Status	RoHS non-compliant	RoHS Compliant	ROHS3 Compliant
Cable Group Compatibility	Belden 8281	Belden 8281	RG-59 Double Braid, Belden 9231
Inventory Status	701 Pcs New Original In Stock	765 Pcs New Original In Stock	718 Pcs New Original In Stock

Engineering Selection Recommendations

For Active Production Applications:

The TE Connectivity 5330878 (parametric equivalent) is the primary substitute for the 330878. Both parts are designated as active products with identical electrical performance. The 5330878 provides the additional benefit of RoHS compliance, making it suitable for applications subject to regulatory requirements. The extended minimum operating temperature (-65°C versus -55°C) provides enhanced performance margin in cold environment applications.

For Legacy System Support and Replacement:

The Amphenol RF 31-321-1000 is available as a direct manufacturer substitute for applications requiring legacy component replacement or where enhanced frequency capability (4 GHz) and extended temperature range (-65°C ~ 165°C) provide system advantages. This part carries a "Not For New Designs" designation, indicating it is maintained for existing system support only. The 31-321-1000 features PTFE dielectric material and nickel body finish, differing from the polypropylene dielectric and silver finish of the primary part.

Regulatory Compliance Considerations:

The main part 330878 is RoHS non-compliant. Applications subject to RoHS requirements must utilize either the 5330878 (RoHS Compliant) or 31-321-1000 (ROHS3 Compliant) substitutes.

Frequently Asked Questions (FAQ)

Q: Can the 5330878 be used as a direct replacement for the 330878 in existing designs?

A: Yes. The 5330878 matches all critical electrical and mechanical parameters of the 330878, including impedance (50 Ohms), frequency response (2.5 GHz), voltage rating (500 V), insertion loss (0.2 dB), and mating cycles (500). Both parts feature identical crimp termination, bayonet lock fastening, and free-hanging mounting configuration. The 5330878 provides an extended operating temperature minimum of -65°C compared to -55°C for the 330878.

Q: What are the differences between the 31-321-1000 and the 330878?

A: The 31-321-1000 is manufactured by Amphenol RF rather than TE Connectivity and features several enhancements: maximum frequency of 4 GHz (versus 2.5 GHz), extended operating temperature range to 165°C (versus 85°C), PTFE dielectric material (versus polypropylene), and nickel body finish (versus silver). All core electrical parameters including impedance, voltage rating, insertion loss, and mating cycles remain identical. The 31-321-1000 is designated "Not For New Designs," indicating it is available for legacy applications only.

Q: Are there cable group compatibility differences between these substitutes?

A: Yes. The 330878 and 5330878 are specified for Belden 8281 cable group. The 31-321-1000 is compatible with RG-59 Double Braid and Belden 9231 cable groups. Cable compatibility must be verified for the specific application before substitution.

Q: Which substitute should be selected for RoHS-compliant applications?

A: The 5330878 (RoHS Compliant) is the appropriate choice for applications requiring RoHS compliance. The 31-321-1000 (ROHS3 Compliant) is also compliant but is designated "Not For New Designs" and should be used only for legacy system replacement.

Q: What is the significance of the "Not For New Designs" status for the 31-321-1000?

A: This designation indicates that while the 31-321-1000 remains available for purchase and is suitable for replacement in existing systems, the manufacturer does not recommend its use in new product designs. New designs should utilize the 330878 or the preferred substitute 5330878.

Q: Are the mating cycle ratings identical across all three parts?

A: Yes. All three parts (330878, 5330878, and 31-321-1000) are rated for 500 mating cycles, indicating equivalent mechanical durability and connector life expectancy.

Q: What is the inventory availability for each part?

A: Current inventory levels are 701 units for the 330878, 765 units for the 5330878, and 718 units for the 31-321-1000, all listed as new original stock.

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