UG-657/U(40) BNC Connector - Equivalent & Substitute Parts

Part Overview

The UG-657/U(40) is a BNC connector jack (female socket) manufactured by Hirose Electric Co Ltd, designed for 50-ohm coaxial applications. This panel-mount, bulkhead connector features a solder cup termination and bayonet lock fastening, rated for operation up to 4 GHz. The part is active in production with RoHS compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical and mechanical parameters align with the original specification, enabling direct replacement in applications where the primary part is unavailable or inventory constraints require alternative sourcing.

Substiute Parts

UG-657/U(40)

Hirose Electric Co LtdIn Stock: 964UG-657/U(40) Datasheet

Current PartRFQ

UG-625/U(40)

Hirose Electric Co LtdIn Stock: 1183UG-625/U(40) Datasheet

Parametric EquivalentRFQ

031-3376

Amphenol RFIn Stock: 935031-3376 Datasheet

Parametric EquivalentRFQ

RFB-1116-3

RF IndustriesIn Stock: 1585RFB-1116-3 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UG-657/U(40) are qualified based on strict alignment of the following critical parameters:

• Connector Style: BNC
• Connector Type: Jack, Female Socket
• Impedance: 50 Ohms
• Contact Termination: Solder Cup
• Shield Termination: Solder
• Mounting Type: Panel Mount
• Mounting Feature: Bulkhead - Rear Side Nut
• Fastening Type: Bayonet Lock
• Frequency - Max: 4 GHz
• Number of Ports: 1
• Dielectric Material: Polytetrafluoroethylene (PTFE)

All identified substitutes maintain these core electrical and mechanical specifications. Variations in secondary parameters such as center contact material, body finish, operating temperature range, and mating cycle ratings do not preclude substitution when the primary functional parameters remain constant.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—UG-625/U(40), 031-3376, and RFB-1116-3—meet the core electrical and mechanical requirements for direct substitution with the UG-657/U(40). Selection among these alternatives should be based on the following factors:

UG-625/U(40) is manufactured by Hirose Electric Co Ltd, matching the original manufacturer. This part maintains identical operating temperature range and contact material specifications while offering enhanced mating cycle durability (5000 cycles versus 1000 cycles). RoHS compliance is maintained.

031-3376 is manufactured by Amphenol RF and provides an extended operating temperature range (-65°C ~ 165°C) compared to the original specification. This part features gold-plated center contacts and includes insertion loss specification (0.2 dB). ROHS3 compliance is provided. Mating cycle rating is lower at 500 cycles.

RFB-1116-3 is manufactured by RF Industries with ROHS3 compliance. This part features nickel body finish and gold-plated center contacts. Operating temperature range and mating cycle specifications are not provided. Packaging is supplied in bag format rather than bulk.

All parts carry unlimited moisture sensitivity rating and maintain 50-ohm impedance, 4 GHz frequency rating, and PTFE dielectric material.

Frequently Asked Questions (FAQ)

Q: Can UG-625/U(40) be used as a direct replacement for UG-657/U(40)?

A: Yes. Both parts are manufactured by Hirose Electric Co Ltd and share identical core specifications including connector style, impedance, termination type, mounting configuration, and frequency rating. The UG-625/U(40) offers superior mating cycle durability (5000 versus 1000 cycles).

Q: What is the difference between silver and gold plating on the center contact?

A: Silver plating is used on the UG-657/U(40) and UG-625/U(40). Gold plating is used on 031-3376 and RFB-1116-3. Both finishes maintain electrical performance at 50 ohms and 4 GHz. Contact material composition differs: beryllium copper (original parts) versus phosphor bronze (substitute parts from Amphenol RF and RF Industries).

Q: Does body finish (silver versus nickel) affect electrical performance?

A: Body finish does not affect the electrical performance of the connector at the specified 4 GHz frequency and 50-ohm impedance. Silver finish is used on UG-657/U(40), UG-625/U(40), and 031-3376. Nickel finish is used on RFB-1116-3.

Q: Are all substitute parts RoHS compliant?

A: Yes. UG-657/U(40) and UG-625/U(40) are RoHS Compliant. 031-3376 and RFB-1116-3 are ROHS3 Compliant. All parts meet regulatory requirements for hazardous substance restrictions.

Q: What is the significance of mating cycle ratings?

A: Mating cycle ratings indicate the number of connect/disconnect cycles the connector is rated to withstand. UG-657/U(40) is rated for 1000 cycles, UG-625/U(40) for 5000 cycles, and 031-3376 for 500 cycles. RFB-1116-3 does not specify this parameter. Selection should consider the expected frequency of mating operations in the application.

Q: Does packaging format affect compatibility?

A: Packaging format (bulk versus bag) does not affect electrical or mechanical compatibility. UG-657/U(40), UG-625/U(40), and 031-3376 are supplied in bulk packaging. RFB-1116-3 is supplied in bag packaging. Packaging selection is based on inventory management and procurement requirements.

Q: Can 031-3376 be used in applications requiring the original -55°C ~ 85°C operating temperature range?

A: Yes. The 031-3376 is rated for -65°C ~ 165°C, which encompasses the original -55°C ~ 85°C range. The extended temperature rating provides additional operational margin.