TE Connectivity 5221128-2 BNC Connector Plug Equivalent & Substitute Parts

Part Overview

The TE Connectivity 5221128-2 is a BNC connector plug designed for 50-ohm coaxial cable applications. This male pin connector features crimp termination for both center contact and shield, supporting RG-59, 59A, 59B, 62, 62A, and 62B cable groups. The part is currently in active product status with 875 units in stock.

Substitute parts become necessary when the primary part number reaches end-of-life status, when inventory constraints require alternative sourcing, or when design revisions necessitate compatible alternatives that maintain electrical and mechanical compatibility within the same connector family.

Key Parameters

Parameter	Value
Connector Style	BNC
Connector Type	Plug, Male Pin
Impedance	50 Ohms
Contact Termination	Crimp
Shield Termination	Crimp
Mounting Type	Free Hanging (In-Line)
Cable Group Compatibility	RG-59, 59A, 59B, 62, 62A, 62B
Fastening Type	Bayonet Lock
Frequency - Max	4 GHz
Voltage Rating	500 V
Operating Temperature Range	-55°C to 85°C
Insertion Loss	0.2 dB
Mating Cycles	500

Substitute Part Grouping Explanation

Substitution eligibility for the 5221128-2 is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

Connector Style: BNC
Connector Type: Plug, Male Pin
Impedance: 50 Ohms
Contact Termination: Crimp
Shield Termination: Crimp
Mounting Type: Free Hanging (In-Line)
Cable Group: RG-59, 59A, 59B, 62, 62A, 62B
Fastening Type: Bayonet Lock
Frequency - Max: 4 GHz
Voltage Rating: 500 V
Operating Temperature Range: -55°C to 85°C
Insertion Loss: 0.2 dB
Mating Cycles: 500

All identified substitute parts maintain these electrical and mechanical parameters. Variations in body material composition, center contact plating material, included component count, and product status do not affect functional interchangeability within the specified application envelope.

Parameter Comparison

Part Number	Manufacturer	Product Status	Body Material	Center Contact Plating	Included Components	RoHS Status	Inventory (Pcs)
5221128-2	TE Connectivity AMP Connectors	Active	Zinc	Gold	4 pcs (Connector, Contact, Ferrule, Spacer)	RoHS Compliant	875
1-5221128-1	TE Connectivity AMP Connectors	Obsolete	Brass	Gold	4 pcs (Connector, Contact, Ferrule, Spacer)	RoHS Compliant	922
227079-7	TE Connectivity AMP Connectors	Active	Brass	Gold	3 pcs (Connector, Contact, Ferrule)	RoHS Non-Compliant	910
8-5227079-1	TE Connectivity AMP Connectors	Obsolete	Brass	Silver	4 pcs (Connector, Contact, Ferrule, Spacer)	RoHS Compliant	987
1-5227079-1	TE Connectivity AMP Connectors	Active	Brass	Silver	4 pcs (Connector, Contact, Ferrule, Spacer)	RoHS Compliant	846
5227079-7	TE Connectivity AMP Connectors	Obsolete	Brass	Gold	4 pcs (Connector, Contact, Ferrule, Spacer)	RoHS Compliant	1181

Engineering Selection Recommendations

Primary Recommendation: 1-5227079-1

The 1-5227079-1 is the preferred substitute for the 5221128-2. This part maintains active product status, ensuring continued manufacturer support and availability. It carries RoHS compliance certification, matching the regulatory posture of the primary part. The connector includes all four component pieces (connector, contact, ferrule, and spacer) and provides 846 units in current inventory. The silver center contact plating provides equivalent electrical performance within the specified 50-ohm impedance and 4 GHz frequency envelope.

Secondary Recommendation: 227079-7

The 227079-7 serves as an alternative when inventory constraints on the primary recommendation occur. This part maintains active product status and includes the core connector assembly with contact and ferrule. However, this part is RoHS non-compliant and includes only three component pieces rather than four. Selection of this part requires verification that RoHS non-compliance does not conflict with end-application regulatory requirements.

Tertiary Options: 8-5227079-1 and 5227079-7

Both parts carry obsolete product status designations. While electrically and mechanically equivalent, these parts should be selected only when primary and secondary options are unavailable, as obsolete status indicates discontinued manufacturer support and potential future supply constraints.

Not Recommended: 1-5221128-1

Although this part is RoHS compliant and includes all four component pieces, its obsolete product status makes it unsuitable for new designs or long-term production planning.

Frequently Asked Questions (FAQ)

Q: Can 1-5227079-1 be used as a direct replacement for 5221128-2 in existing assemblies?

A: Yes. Both connectors maintain identical electrical specifications (50-ohm impedance, 4 GHz maximum frequency, 500 V rating, 0.2 dB insertion loss) and mechanical compatibility (BNC plug, male pin, crimp termination, bayonet lock fastening). The connectors are compatible with the same cable groups (RG-59, 59A, 59B, 62, 62A, 62B) and operate across the same temperature range (-55°C to 85°C).

Q: What is the difference between the gold and silver center contact plating options?

A: Both gold-plated (5221128-2, 227079-7, 5227079-7) and silver-plated (8-5227079-1, 1-5227079-1) center contacts deliver the specified 0.2 dB insertion loss and maintain 50-ohm impedance. The plating material does not affect electrical performance within the stated frequency and voltage parameters. Selection between these options depends on application-specific corrosion resistance requirements or existing assembly specifications.

Q: Why does 227079-7 include only three components while other parts include four?

A: The 227079-7 omits the spacer component included in other variants. The spacer does not affect connector electrical or mechanical function. Selection of 227079-7 is appropriate when the spacer is not required by the application assembly process.

Q: Are all substitute parts RoHS compliant?

A: No. The 227079-7 is RoHS non-compliant. All other substitute parts (1-5221128-1, 8-5227079-1, 1-5227079-1, 5227079-7) carry RoHS compliance certification. Applications subject to RoHS regulatory requirements must exclude 227079-7 from component selection.

Q: What is the significance of product status (Active vs. Obsolete)?

A: Active status indicates the manufacturer continues production and provides full technical support. Obsolete status indicates the manufacturer has discontinued production. Parts with obsolete status should be selected only when active alternatives are unavailable, as future availability and manufacturer support cannot be guaranteed.

Q: Can these connectors be used interchangeably in RF applications operating at 4 GHz?

A: Yes. All substitute parts maintain the 4 GHz maximum frequency specification and 0.2 dB insertion loss rating. The connectors are electrically equivalent for RF applications within this frequency envelope.

Q: What inventory levels are currently available for each substitute part?

A: Current inventory levels are: 5221128-2 (875 pcs), 1-5221128-1 (922 pcs), 227079-7 (910 pcs), 8-5227079-1 (987 pcs), 1-5227079-1 (846 pcs), and 5227079-7 (1181 pcs). Inventory levels are subject to change and should be verified at time of procurement.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message