Amphenol RF 142139 SMB Coaxial Connector - Equivalent & Substitute Parts

Part Overview

The Amphenol RF 142139 is an SMB Jack coaxial connector designed for RF applications requiring 75 Ohm impedance. This through-hole solder-mount connector operates across frequencies up to 4 GHz and is rated for 335 V with a maximum operating temperature range of -65°C to 165°C. The connector features a snap-on fastening mechanism and gold-plated brass construction with PTFE dielectric material. The part maintains Active product status and is ROHS3 compliant with REACH compliance. Substitute parts are identified when equivalent electrical and mechanical parameters align with application requirements, enabling component sourcing flexibility while maintaining circuit performance specifications.

Substiute Parts

142139

Amphenol RFIn Stock: 811142139 Datasheet

Current PartRFQ

131-8701-201

Cinch Connectivity Solutions JohnsonIn Stock: 1519131-8701-201 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Amphenol RF 142139 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Impedance: 75 Ohms (exact match required)
• Connector Type: Jack, Male Pin (exact match required)
• Mounting Type: Through Hole (exact match required)
• Contact Termination: Solder (exact match required)
• Shield Termination: Solder (exact match required)
• Fastening Type: Snap-On (exact match required)
• Operating Temperature Range: -65°C ~ 165°C (exact match required)
• Voltage Rating: 335 V (exact match required)
• Mating Cycles: 500 (exact match required)
• Body Material: Brass (exact match required)
• Body Finish: Gold (exact match required)
• Dielectric Material: PTFE (exact match required)
• RoHS Status: ROHS3 Compliant (exact match required)
• REACH Status: REACH Affected (exact match required)

Allowable Variation Parameters:

• Connector Style: SMB or SMB Mini (functional equivalence within SMB family)
• Center Contact Material: Brass or Beryllium Copper (both acceptable for 75 Ohm applications)
• Frequency - Max: 4 GHz or lower (substitutes must not exceed application frequency requirements)
• Insertion Loss: Specification provided or unspecified (performance parameter)

The Cinch Connectivity Solutions Johnson 131-8701-201 qualifies as a substitute based on matching all critical parameters while operating within acceptable frequency and material specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the Amphenol RF 142139 and Cinch Connectivity Solutions Johnson 131-8701-201 maintain Active product status and satisfy ROHS3 and REACH compliance requirements. Selection between these parts is determined by application frequency requirements and connector form factor specifications.

The Amphenol RF 142139 operates at maximum frequency of 4 GHz and is designated as standard SMB style. This part is appropriate for applications requiring full 4 GHz bandwidth capability.

The Cinch 131-8701-201 operates at maximum frequency of 2 GHz and is designated as SMB Mini style. This part is appropriate for applications with frequency requirements up to 2 GHz and where compact form factor is required or acceptable.

Both parts share identical electrical characteristics for impedance, voltage rating, mating cycles, and operating temperature range. Both employ PTFE dielectric material and gold-plated brass construction. Contact material differences (Brass versus Beryllium Copper) do not affect 75 Ohm impedance performance in these connector classes.

Selection must be based on circuit frequency requirements and physical space constraints. Applications operating above 2 GHz require the Amphenol RF 142139. Applications operating at 2 GHz or below may use either part based on form factor availability and sourcing requirements.

Frequently Asked Questions (FAQ)

Q: Can the Cinch 131-8701-201 be used in place of the Amphenol RF 142139 in all applications?

A: No. The Cinch 131-8701-201 has a maximum frequency rating of 2 GHz, while the Amphenol RF 142139 operates to 4 GHz. The Cinch part is suitable only for applications with frequency requirements at or below 2 GHz. Applications requiring 4 GHz operation must use the Amphenol RF 142139.

Q: What is the difference between SMB and SMB Mini connector styles?

A: Both are SMB family connectors with identical electrical specifications for this application. SMB Mini represents a compact form factor variant. The physical dimensions differ, but electrical performance at 75 Ohms impedance is equivalent. Form factor selection depends on available PCB space and mechanical mounting requirements.

Q: Are the center contact materials interchangeable?

A: Yes, for 75 Ohm impedance applications. The Amphenol RF 142139 uses Brass center contact material, while the Cinch 131-8701-201 uses Beryllium Copper. Both materials provide equivalent electrical performance in these connector classes and are acceptable for 75 Ohm impedance circuits.

Q: Do both parts have the same operating temperature range?

A: Yes. Both the Amphenol RF 142139 and Cinch 131-8701-201 operate across -65°C to 165°C temperature range with identical voltage rating of 335 V and mating cycle rating of 500 cycles.

Q: What is the significance of the insertion loss specification?

A: The Amphenol RF 142139 specifies 0.3 dB insertion loss. The Cinch 131-8701-201 does not provide insertion loss specification in available documentation. For applications where insertion loss is a critical parameter, the Amphenol RF 142139 provides documented performance data. Both parts employ identical dielectric material (PTFE) and gold plating, which typically result in comparable insertion loss performance.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the Amphenol RF 142139 and Cinch 131-8701-201 are ROHS3 compliant and REACH affected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: What packaging differences exist between these parts?

A: The Amphenol RF 142139 is supplied in Bag packaging, while the Cinch 131-8701-201 is supplied in Bulk packaging. Packaging format does not affect electrical or mechanical performance and is determined by supplier inventory and ordering requirements.