HRM-554S Equivalent & Substitute Parts

Part Overview

The HRM-554S is a coaxial adapter connector manufactured by Hirose Electric Co Ltd, designed to convert between N Plug (male pin) and SMA Jack (female socket) configurations. This adapter operates at 50 Ohms impedance with a maximum frequency rating of 12.4 GHz and supports operating temperatures from -55°C to 125°C. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and component procurement.

Substiute Parts

HRM-554S

Hirose Electric Co LtdIn Stock: 745HRM-554S Datasheet

Current PartRFQ

901-294

Amphenol RFIn Stock: 722901-294 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HRM-554S is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Adapter Type: Plug to Jack
• Adapter Series: SMA to N (conversion between N and SMA connector families)
• Convert From: N Plug, Male Pin
• Convert To: SMA Jack, Female Socket
• Impedance: 50 Ohms
• Style: Straight
• Mounting Type: Free Hanging (In-Line)
• Fastening Type: Threaded, Threaded
• Center Contact Material: Beryllium Copper
• Dielectric Material: Polytetrafluoroethylene (PTFE)
• Center Contact Plating: Gold

The substitute part 901-294 (Amphenol RF) meets all mandatory matching parameters and is therefore classified as a direct functional equivalent.

Parameter Comparison

Engineering Selection Recommendations

The 901-294 (Amphenol RF) is a direct functional substitute for the HRM-554S based on electrical and mechanical parameter equivalence. Key considerations for selection:

Product Status: The HRM-554S is obsolete, while 901-294 is active and currently in production. This ensures long-term availability and supply chain continuity.

Compliance Posture: The 901-294 is ROHS3 compliant, whereas the HRM-554S is RoHS non-compliant. For applications subject to RoHS regulations, the 901-294 is the appropriate choice. The 901-294 is REACH Affected, indicating regulatory substance tracking; the HRM-554S is REACH Unaffected.

Operating Temperature Range: The 901-294 supports -65°C to 165°C, which exceeds the HRM-554S range of -55°C to 125°C. This provides expanded operational capability for temperature-sensitive applications.

Electrical and Mechanical Equivalence: Both parts maintain identical impedance (50 Ohms), connector gender configuration, dielectric material (PTFE), center contact material (Beryllium Copper), and plating (Gold). Maximum frequency rating is identical at 12.4 GHz.

Frequently Asked Questions (FAQ)

Q: Can the 901-294 be used as a direct replacement for the HRM-554S in existing designs?

A: Yes. The 901-294 meets all mandatory electrical and mechanical parameters for the HRM-554S, including impedance, connector configuration, materials, and frequency rating. Both are straight-style, free-hanging adapters with threaded fastening.

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

A: The HRM-554S is RoHS non-compliant, while the 901-294 is ROHS3 compliant. For applications or markets requiring RoHS compliance, the 901-294 is the mandated choice. Existing designs using the HRM-554S may require qualification updates if regulatory requirements change.

Q: Does the extended operating temperature range of the 901-294 affect compatibility?

A: No. The 901-294 operating range (-65°C to 165°C) encompasses the HRM-554S range (-55°C to 125°C). The extended range provides additional operational margin and does not introduce incompatibility.

Q: Are there packaging differences between these parts?

A: The 901-294 is supplied in Bulk packaging. The HRM-554S packaging specification is not provided. Confirm packaging requirements with your procurement process.

Q: What is the difference in REACH status between these parts?

A: The 901-294 is REACH Affected, meaning it contains substances subject to REACH regulatory tracking. The HRM-554S is REACH Unaffected. For applications in REACH-regulated markets, verify that the 901-294 meets your supply chain documentation requirements.

Q: Are the mating cycle ratings equivalent?

A: The HRM-554S specifies 1000 mating cycles. The 901-294 mating cycle rating is not provided in the available data. Confirm mechanical durability requirements with the manufacturer if mating cycle performance is critical to your application.