MMCX-P-178B/U Equivalent & Substitute Parts

Part Overview

The MMCX-P-178B/U is a coaxial connector plug manufactured by Hirose Electric Co Ltd, designed for 50 Ohm RF applications with a maximum frequency rating of 6 GHz. This connector features a male pin configuration with solder termination and snap-on fastening, suitable for free-hanging (in-line) mounting with RG-178B cable groups.

The main part is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

MMCX-P-178B/U

Hirose Electric Co LtdIn Stock: 862MMCX-P-178B/U Datasheet

Current PartRFQ

MMCX-P-178B/U(40)

Hirose Electric Co LtdIn Stock: 745MMCX-P-178B/U(40) Datasheet

Parametric EquivalentRFQ

908-41200

Amphenol RFIn Stock: 774908-41200 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MMCX-P-178B/U is determined by strict alignment of the following parameters:

• Connector Style: MMCX
• Connector Type: Plug, Male Pin
• Impedance: 50 Ohms
• Contact Termination: Solder
• Shield Termination: Crimp
• Mounting Type: Free Hanging (In-Line)
• Fastening Type: Snap-On
• Frequency - Max: 6 GHz or greater
• Mating Cycles: 500 or greater
• Operating Temperature Range: -55°C ~ 85°C or wider

All identified substitute parts meet these core electrical and mechanical parameters. Differences in packaging, product status, and compliance certifications are noted separately.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring the MMCX-P-178B/U, the following selection criteria apply:

MMCX-P-178B/U(40) (Hirose Electric Co Ltd): This part is the direct parametric equivalent from the original manufacturer. It maintains identical electrical and mechanical specifications while offering active product status and RoHS compliance. This part is recommended as the primary substitute for new designs and production applications.

908-41200 (Amphenol RF): This part meets all core electrical and mechanical parameters and is manufactured by an established RF connector supplier. It offers ROHS3 compliance and broader cable group compatibility (RG-178, 178A, 178B, 196, 196A, M17/93-RG178). Operating temperature range is not specified in available documentation. This part is suitable for applications where multi-source qualification is required or where Amphenol RF components are preferred.

Frequently Asked Questions (FAQ)

Q: Can MMCX-P-178B/U(40) be used as a direct replacement for MMCX-P-178B/U?

A: Yes. Both parts share identical connector style, type, impedance, termination methods, mounting configuration, frequency rating, and mating cycle specifications. The primary difference is product status (active vs. obsolete) and RoHS compliance. MMCX-P-178B/U(40) is the recommended substitute.

Q: What is the difference between the Hirose and Amphenol RF options?

A: Both parts meet the core electrical and mechanical requirements. The Amphenol RF 908-41200 supports a broader range of cable groups and carries ROHS3 compliance. The Hirose MMCX-P-178B/U(40) maintains exact specifications from the original manufacturer. Selection depends on supply chain preferences and qualification requirements.

Q: Are there packaging differences between these parts?

A: Yes. MMCX-P-178B/U is listed with unspecified packaging, while MMCX-P-178B/U(40) is supplied in bulk packaging. The Amphenol RF 908-41200 includes 3 pcs per unit (1 Connector, 1 Contact, 1 Ferrule). Verify packaging requirements for your application.

Q: Does the Amphenol RF part support RG-178B cable?

A: Yes. The 908-41200 supports RG-178B as part of its broader cable group compatibility (RG-178, 178A, 178B, 196, 196A, M17/93-RG178).

Q: What is the significance of the RoHS compliance difference?

A: The original MMCX-P-178B/U is RoHS non-compliant. Both substitute parts are RoHS compliant (MMCX-P-178B/U(40) is RoHS Compliant; 908-41200 is ROHS3 Compliant). This is relevant for applications subject to RoHS regulations or customer requirements.