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Amphenol RF 31-71008-RFX BNC Connector Plug Equivalent & Substitute Parts
Part Overview
The Amphenol RF 31-71008-RFX is a BNC connector plug designed for 75 ohm coaxial cable applications. This male pin connector features crimp termination for both center contact and shield, with a bayonet lock fastening mechanism. The part is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Alternative equivalent and substitute parts are available to support ongoing maintenance, repair, and legacy system requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 31-71008-RFX |
| Manufacturer | Amphenol RF |
| Connector Style | BNC |
| Connector Type | Plug, Male Pin |
| Impedance | 75 Ohms |
| Contact Termination | Crimp |
| Shield Termination | Crimp |
| Mounting Type | Free Hanging (In-Line) |
| Fastening Type | Bayonet Lock |
| Frequency - Max | 2 GHz |
| Voltage Rating | 500 V |
| Operating Temperature | -65°C ~ 165°C |
| Cable Group | RG-59, 59B, 62, 140, 210, Belden 8241, 8263, 8279, 9209 |
| RoHS Status | ROHS3 Compliant |
| Product Status | Not For New Designs |
Substitute Part Grouping Explanation
Substitution of the 31-71008-RFX is determined by the following critical parameters:
Primary Substitution Criteria:
- Connector Style: BNC
- Connector Type: Plug, Male Pin
- Impedance: 75 Ohms
- Contact Termination: Crimp
- Shield Termination: Crimp
- Mounting Type: Free Hanging (In-Line)
- Fastening Type: Bayonet Lock
- Voltage Rating: 500 V
- Cable Group Compatibility
Substitution Categories:
Direct Manufacturer Equivalents (Amphenol RF): Parts that maintain identical electrical and mechanical specifications with improved product status or enhanced frequency capability.
Parametric Equivalents (Amphenol RF): Parts that share core electrical specifications but may differ in packaging, included components, or frequency rating.
Cross-Manufacturer Alternatives: Parts from other manufacturers (Pomona Electronics, TE Connectivity, Cinch Connectivity Solutions Trompeter) that meet the same functional requirements and electrical specifications.
Non-Equivalent Parts: Parts with differing impedance (50 Ohms) or termination method (Solder vs. Crimp) are listed for reference but do not constitute direct substitutes.
Parameter Comparison
| Part Number | Manufacturer | Impedance | Contact Termination | Shield Termination | Frequency - Max | Product Status | Packaging | Cable Group |
|---|---|---|---|---|---|---|---|---|
| 31-71008-RFX | Amphenol RF | 75 Ohms | Crimp | Crimp | 2 GHz | Not For New Designs | Bulk | RG-59, 59B, 62, 140, 210, Belden 8241, 8263, 8279, 9209 |
| 112123 | Amphenol RF | 75 Ohms | Crimp | Crimp | 4 GHz | Active | Bag | RG-59, 59B, 62, 140, 210, Belden 8241, 8263, 8279, 9209 |
| 031-71008-1RFX | Amphenol RF | 75 Ohms | Crimp | Crimp | 2 GHz | Not For New Designs | Bulk | RG-59, 59B, 62, 140, 210, Belden 8241, 8263, 8279, 9209 |
| 68175 | Amphenol RF | 50 Ohms | Crimp | Crimp | 2 GHz | Not For New Designs | Bulk | RG-59, 59B, 62, 140, 210, Belden 8241, 8263, 8279, 9209 |
| 5286 | Pomona Electronics | 75 Ohms | Solder | Crimp | 4 GHz | Active | Bulk | RG-59, 59A, 59B, 62, 62A, 62B, 62C, 210 |
| 5413589-2 | TE Connectivity AMP Connectors | 75 Ohms | Crimp | Crimp | 2 GHz | Obsolete | Not Specified | RG-59, 59A, 59B |
| UPL220-009 | Cinch Connectivity Solutions Trompeter | 75 Ohms | Crimp | Crimp | 4 GHz | Active | Bulk | Belden 8218, YR23023, Essex 21-597 |
| UPL220-013 | Cinch Connectivity Solutions Trompeter | 75 Ohms | Crimp | Crimp | 4 GHz | Active | Bulk | RG-59 |
| UPL220-020 | Cinch Connectivity Solutions Trompeter | 75 Ohms | Crimp | Crimp | 4 GHz | Active | Bulk | Belden 9248 |
| UPL220-025 | Cinch Connectivity Solutions Trompeter | 75 Ohms | Crimp | Crimp | 4 GHz | Active | Bulk | 734A |
| UPL220-026 | Cinch Connectivity Solutions Trompeter | 75 Ohms | Crimp | Crimp | 4 GHz | Active | Bulk | 735A |
Engineering Selection Recommendations
Tier 1 - Direct Amphenol RF Equivalents:
The part 112123 (Amphenol RF) is the primary recommended substitute. It maintains identical electrical specifications (75 Ohms, crimp termination, bayonet lock) and cable group compatibility while offering an active product status. The 112123 provides enhanced frequency capability (4 GHz vs. 2 GHz) and is currently in production. Packaging differs (Bag vs. Bulk), but functional performance is equivalent.
The part 031-71008-1RFX (Amphenol RF) is a parametric equivalent with identical electrical and mechanical specifications to the original 31-71008-RFX. Both parts carry "Not For New Designs" status and share the same 2 GHz frequency rating. This part is suitable for direct replacement in legacy applications.
Tier 2 - Cross-Manufacturer Active Alternatives:
The Cinch Connectivity Solutions Trompeter UPL220 series (UPL220-009, UPL220-013, UPL220-020, UPL220-025, UPL220-026) provides active product status with 75 ohm impedance, crimp termination, and 4 GHz frequency capability. Selection within this series depends on cable group compatibility. All UPL220 variants are ROHS3 compliant and carry REACH Affected status.
Tier 3 - Alternative Termination Method:
The Pomona Electronics 5286 is a 75 ohm BNC plug with solder termination (not crimp). This part is suitable only for applications where solder termination is acceptable and preferred over crimp termination. It offers 4 GHz frequency capability and active product status.
Non-Equivalent Parts:
The Amphenol RF 68175 features 50 ohm impedance and is not suitable as a substitute for 75 ohm applications. The TE Connectivity 5413589-2 is obsolete and not recommended for new procurement despite functional similarity.
Frequently Asked Questions (FAQ)
Q: Can I use part 112123 as a direct replacement for 31-71008-RFX?
A: Yes. The 112123 is functionally equivalent with identical impedance (75 Ohms), termination method (crimp), and cable group compatibility. The primary differences are active product status and enhanced frequency rating (4 GHz vs. 2 GHz). Packaging differs (Bag vs. Bulk) but does not affect connector performance.
Q: What is the difference between 31-71008-RFX and 031-71008-1RFX?
A: Both parts are parametric equivalents with identical electrical specifications, operating temperature range, and frequency rating (2 GHz). The primary difference is the manufacturer part number designation. Both carry "Not For New Designs" status. Selection between them depends on inventory availability and internal part numbering systems.
Q: Can I substitute a 50 ohm connector (68175) for the 75 ohm 31-71008-RFX?
A: No. The 68175 is a 50 ohm connector and is not suitable for 75 ohm applications. Impedance mismatch will result in signal reflections and degraded performance. Use only 75 ohm equivalents.
Q: What are the advantages of the Cinch UPL220 series over the original part?
A: The UPL220 series offers active product status, higher frequency capability (4 GHz vs. 2 GHz), and current manufacturing support. All variants maintain 75 ohm impedance and crimp termination. Selection depends on specific cable group requirements.
Q: Is the Pomona Electronics 5286 a suitable substitute?
A: The 5286 is functionally similar with 75 ohm impedance and 4 GHz frequency capability. However, it uses solder termination instead of crimp termination. Use this part only if solder termination is compatible with your application requirements and assembly process.
Q: What does "Not For New Designs" status mean?
A: This designation indicates the part has been superseded by newer alternatives in the manufacturer's product line. While the part remains available and functional, it is not recommended for new product development. For legacy system maintenance and repair, the part remains suitable.
Q: Are all substitute parts RoHS compliant?
A: Yes. All listed substitute parts are RoHS3 compliant or RoHS compliant, meeting environmental and regulatory requirements for electronic components.
Q: How do I select the correct UPL220 variant?
A: Selection is based on cable group compatibility. UPL220-013 is optimized for RG-59 cable. UPL220-020 is for Belden 9248. UPL220-025 is for 734A cable. UPL220-026 is for 735A cable. UPL220-009 supports Belden 8218, YR23023, and Essex 21-597. Verify your cable type before selection.
Q: What is the difference between Bulk and Bag packaging?
A: Packaging type does not affect connector performance or electrical specifications. Bulk packaging typically contains larger quantities in standard industrial packaging, while Bag packaging may contain smaller quantities in protective bags. Selection depends on procurement requirements and inventory management practices.
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