HRM-302S SMA Coaxial Connector Equivalent & Substitute Parts

Part Overview

The HRM-302S is an SMA connector receptacle manufactured by Hirose Electric Co Ltd, designed for 50-ohm RF applications with a maximum frequency rating of 12.4 GHz. This female socket connector features solder termination for both center contact and shield, panel mount configuration with threaded fastening, and extended insulation. The HRM-302S is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new designs requiring compatible RF connectivity solutions.

Key Parameters

Parameter	Value
Connector Style	SMA
Connector Type	Receptacle, Female Socket
Impedance	50 Ohms
Contact Termination	Solder
Shield Termination	Solder
Mounting Type	Panel Mount
Mounting Feature	Flange
Fastening Type	Threaded
Frequency - Max	12.4 GHz
Center Contact Material	Beryllium Copper
Center Contact Plating	Gold
Body Material	Stainless Steel
Dielectric Material	Polytetrafluoroethylene (PTFE)
Mating Cycles	1000
Insertion Loss	0.1 dB
RoHS Status	RoHS Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the HRM-302S is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

Connector Style: SMA
Connector Type: Receptacle, Female Socket
Impedance: 50 Ohms
Contact Termination: Solder
Shield Termination: Solder
Mounting Type: Panel Mount
Mounting Feature: Flange
Fastening Type: Threaded
Frequency - Max: 12.4 GHz
Center Contact Material: Beryllium Copper
Center Contact Plating: Gold
Body Material: Stainless Steel
Dielectric Material: PTFE
Mating Cycles: 1000
Insertion Loss: 0.1 dB
MSL Rating: 1 (Unlimited)

All four substitute parts (HRM-300-110S, HRM-300-118S, HRM-303S, HRM-306S) maintain identical values across these parameters. Differences exist only in operating temperature range and product status, which do not affect electrical or mechanical interchangeability for standard RF applications.

Parameter Comparison

Parameter	HRM-302S	HRM-300-110S	HRM-300-118S	HRM-303S	HRM-306S
Connector Style	SMA	SMA	SMA	SMA	SMA
Connector Type	Receptacle, Female Socket	Receptacle, Female Socket	Receptacle, Female Socket	Receptacle, Female Socket	Receptacle, Female Socket
Impedance	50 Ohms	50 Ohms	50 Ohms	50 Ohms	50 Ohms
Contact Termination	Solder	Solder	Solder	Solder	Solder
Shield Termination	Solder	Solder	Solder	Solder	Solder
Mounting Type	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount
Mounting Feature	Flange	Flange	Flange	Flange	Flange
Fastening Type	Threaded	Threaded	Threaded	Threaded	Threaded
Frequency - Max	12.4 GHz	12.4 GHz	12.4 GHz	12.4 GHz	12.4 GHz
Center Contact Material	Beryllium Copper	Beryllium Copper	Beryllium Copper	Beryllium Copper	Beryllium Copper
Center Contact Plating	Gold	Gold	Gold	Gold	Gold
Body Material	Stainless Steel	Stainless Steel	Stainless Steel	Stainless Steel	Stainless Steel
Dielectric Material	PTFE	PTFE	PTFE	PTFE	PTFE
Mating Cycles	1000	1000	1000	1000	1000
Insertion Loss	0.1 dB	0.1 dB	0.1 dB	0.1 dB	0.1 dB
Operating Temperature	-55°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 85°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For applications operating within -55°C to 85°C temperature range: HRM-306S is the direct substitute with identical operating temperature specification. This part carries ROHS3 compliance, providing enhanced regulatory coverage compared to the obsolete HRM-302S.

For applications requiring extended temperature operation to 125°C: HRM-300-110S, HRM-300-118S, or HRM-303S are suitable substitutes. All three parts are active products with RoHS compliance and provide superior thermal performance beyond the original HRM-302S specification.

For new designs and long-term supply assurance: All four substitute parts are active products with established inventory levels, eliminating obsolescence risk associated with the HRM-302S. Selection among HRM-300-110S, HRM-300-118S, HRM-303S, and HRM-306S depends on thermal requirements and regulatory compliance needs specific to the application.

Frequently Asked Questions (FAQ)

Q: Can HRM-300-110S, HRM-300-118S, and HRM-303S be used in place of HRM-302S in existing designs? A: Yes. These parts are electrically and mechanically equivalent across all RF performance parameters, connector geometry, termination method, and impedance specification. The extended operating temperature range (-55°C to 125°C) provides additional capability without affecting compatibility.

Q: What is the difference between HRM-306S and the other substitute parts? A: HRM-306S maintains the original -55°C to 85°C operating temperature range of the HRM-302S and carries ROHS3 compliance. HRM-300-110S, HRM-300-118S, and HRM-303S extend the upper temperature limit to 125°C. All other electrical and mechanical parameters are identical.

Q: Are there packaging differences between these substitute parts? A: The HRM-302S is listed with no specified packaging. All substitute parts are supplied in bulk packaging. This does not affect connector performance or interchangeability.

Q: Which substitute part should be selected for new designs? A: For applications within -55°C to 85°C, HRM-306S is recommended due to ROHS3 compliance and active product status. For applications requiring extended thermal performance, HRM-300-110S, HRM-300-118S, or HRM-303S are appropriate. All four parts are active products with established supply chains.

Q: Do these connectors require any special handling or storage considerations? A: All parts carry MSL Rating 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage practices for RF connectors apply.

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