SMB Connector Plug 0731000255 - Equivalent & Substitute Parts

Part Overview

The Molex 0731000255 is an SMB connector plug designed for 75-ohm coaxial applications. This female socket connector features solder termination for the center contact and crimp termination for the shield, operating across a frequency range up to 4 GHz. The connector is rated for -55°C to 155°C operation and supports 500 mating cycles. As an active product with ROHS3 compliance and REACH compliance status, it serves as a reliable component for RF and coaxial cable assemblies. Identifying equivalent substitute parts ensures design flexibility, supply chain continuity, and compatibility across manufacturing specifications.

Substiute Parts

0731000255

MolexIn Stock: 9120731000255 Datasheet

Current PartRFQ

903-536P-71S

Amphenol RFIn Stock: 951903-536P-71S Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Amphenol RF 903-536P-71S qualifies as a direct substitute for the Molex 0731000255 based on the following critical parameters:

Matching Core Specifications:

• Connector Style: SMB (identical)
• Connector Type: Plug, Female Socket (identical)
• Impedance: 75 Ohms (identical)
• Contact Termination: Solder (identical)
• Shield Termination: Crimp (identical)
• Mounting Type: Free Hanging (In-Line) (identical)
• Fastening Type: Snap-On (identical)
• Frequency - Max: 4 GHz (identical)
• Number of Ports: 1 (identical)
• Center Contact Material: Beryllium Copper (identical)
• Body Material: Brass (identical)
• Dielectric Material: PTFE (identical)
• Mating Cycles: 500 (identical)
• RoHS Status: ROHS3 Compliant (identical)
• REACH Status: REACH Affected (identical)

The substitute part maintains electrical and mechanical compatibility across all specified parameters, enabling direct replacement in applications requiring SMB 75-ohm coaxial connectors with solder termination.

Parameter Comparison

Engineering Selection Recommendations

Both the Molex 0731000255 and Amphenol RF 903-536P-71S are active products with identical ROHS3 and REACH compliance certifications. The Amphenol RF substitute provides an extended operating temperature range (-65°C to 165°C versus -55°C to 155°C), offering broader thermal performance capability. The Molex part features lower insertion loss at 0.2 dB compared to 0.3 dB for the Amphenol RF part. Selection between these parts should be based on specific application requirements regarding temperature extremes and signal loss tolerance. Both parts maintain full electrical and mechanical compatibility for SMB 75-ohm coaxial connector applications.

Frequently Asked Questions (FAQ)

Q: Can the Amphenol RF 903-536P-71S directly replace the Molex 0731000255 in existing designs?

A: Yes. Both connectors share identical specifications for connector style, type, impedance, termination methods, mounting configuration, and frequency rating. Direct substitution is supported for applications requiring SMB 75-ohm female socket connectors with solder and crimp termination.

Q: What are the differences between these two parts?

A: The primary differences are manufacturer identity, body finish (gold versus nickel), operating temperature range, insertion loss, and packaging format. The Amphenol RF part supports a wider temperature range (-65°C to 165°C) and includes compatibility with additional cable groups. The Molex part exhibits lower insertion loss at 0.2 dB.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the Molex 0731000255 and Amphenol RF 903-536P-71S are ROHS3 compliant and REACH affected, meeting current regulatory requirements for electronic component manufacturing and distribution.

Q: What cable types are compatible with these connectors?

A: The Molex part is specified for RG-179 cable group. The Amphenol RF substitute supports RG-179, 179A, 179B, 187, 187A, Belden 9221, and M17/94-RG179 cable groups, providing broader cable compatibility options.

Q: How do the packaging formats differ?

A: The Molex 0731000255 is supplied in bag packaging, while the Amphenol RF 903-536P-71S is supplied in bulk packaging. This distinction affects inventory management and component handling procedures.

Q: What is the mating cycle rating for both connectors?

A: Both connectors are rated for 500 mating cycles, indicating equivalent mechanical durability and expected service life under normal connection and disconnection operations.