UG-349/U Equivalent & Substitute Parts

Part Overview

The UG-349/U is a coaxial adapter connector manufactured by Hirose Electric Co Ltd, designed to convert between BNC Plug (Male Pin) and N Jack (Female Socket) configurations at 50 Ohms impedance. This adapter operates in a straight, free-hanging in-line mounting style with bayonet lock and threaded fastening. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and component procurement.

Substiute Parts

UG-349/U

Hirose Electric Co LtdIn Stock: 866UG-349/U Datasheet

Current PartRFQ

31-217

Amphenol RFIn Stock: 134531-217 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UG-349/U is determined by the following critical parameters that must remain constant:

• Adapter series configuration: BNC Plug to N Jack conversion
• Center gender orientation: Female to Male
• Impedance rating: 50 Ohms
• Mounting style: Straight, free-hanging in-line
• Fastening mechanism: Bayonet lock with threaded engagement
• Connector gender at each end: BNC Male Pin input, N Female Socket output

The substitute part 31-217 (Amphenol RF) satisfies all these core electrical and mechanical requirements, enabling direct functional replacement in applications requiring BNC-to-N adapter connectivity.

Parameter Comparison

Engineering Selection Recommendations

The 31-217 (Amphenol RF) serves as the primary substitute for the obsolete UG-349/U. Selection of this alternative is supported by the following factors:

Product Status: The UG-349/U is obsolete, whereas 31-217 maintains active production status with documented inventory availability (1240 Pcs New Original In Stock), ensuring long-term procurement viability.

Compliance Profile: The 31-217 is ROHS3 compliant, addressing regulatory requirements that the original UG-349/U does not meet. This compliance status is significant for applications subject to environmental and hazardous substance restrictions.

Electrical and Mechanical Compatibility: Both parts maintain identical adapter series configuration, impedance rating, mounting style, and fastening mechanism. The core RF signal path characteristics remain unchanged.

Operational Specifications: The 31-217 provides documented maximum frequency rating (11 GHz) and operating temperature range (-65°C ~ 165°C), specifications not provided for the original part. The substitute exhibits lower mating cycle rating (500 versus 5000), which should be evaluated against application duty cycle requirements.

Frequently Asked Questions (FAQ)

Q: Can the 31-217 directly replace the UG-349/U in existing installations?

A: Yes. Both adapters maintain identical BNC-to-N conversion configuration, 50 Ohm impedance, straight mounting style, and bayonet-threaded fastening. Physical and electrical interface compatibility is preserved.

Q: What is the significance of the mating cycle difference (5000 vs. 500)?

A: Mating cycles indicate the number of connection/disconnection operations the connector is rated to withstand. The UG-349/U is rated for 5000 cycles, while the 31-217 is rated for 500 cycles. Applications requiring frequent connector engagement should evaluate this parameter against actual duty cycle requirements.

Q: Why is RoHS compliance important for this substitution?

A: RoHS3 compliance (31-217) restricts hazardous substances in electrical equipment. The original UG-349/U is non-compliant. For applications subject to environmental regulations or customer specifications requiring RoHS compliance, the 31-217 is the appropriate selection.

Q: Are there packaging differences between these parts?

A: The UG-349/U packaging is not specified in available documentation. The 31-217 is supplied in bulk packaging. Procurement requirements should account for this distinction.

Q: What frequency range is supported by the 31-217?

A: The 31-217 is rated to a maximum frequency of 11 GHz. The original UG-349/U frequency specification is not documented. Applications operating within this frequency envelope are compatible with the substitute.