UBJ28 BNC Coaxial Connector Adapter - Equivalent & Substitute Parts

Part Overview

The UBJ28 is an active BNC coaxial connector adapter manufactured by Cinch Connectivity Solutions Trompeter. This jack-to-jack adapter provides female socket to female socket connectivity with 75 ohm impedance, designed for RF applications requiring bulkhead panel mounting. The adapter operates at frequencies up to 500 MHz and includes mounting hardware (connector, lockwasher, and nut). Finding equivalent substitute parts may be necessary due to inventory availability, lead time requirements, or specific application performance needs while maintaining electrical and mechanical compatibility.

Substiute Parts

UBJ28

Cinch Connectivity Solutions TrompeterIn Stock: 902UBJ28 Datasheet

Current PartRFQ

031-4803-75

Amphenol RFIn Stock: 971031-4803-75 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UBJ28 is determined by strict adherence to the following critical parameters:

Mandatory Matching Parameters:

• Adapter Type: Jack to Jack
• Adapter Series: BNC to BNC
• Center Gender: Female to Female
• Impedance: 75 Ohms
• Style: Straight
• Mounting Type: Panel Mount
• Mounting Feature: Bulkhead
• Fastening Type: Bayonet Lock
• Center Contact Plating: Gold
• Body Material: Brass
• Body Finish: Nickel

Allowable Variation Parameters:

• Frequency - Max: May exceed 500 MHz (higher frequency capability is compatible)
• Manufacturer: Different manufacturer acceptable if all mandatory parameters match
• Center Contact Material: May differ if electrical performance is maintained
• Dielectric Material: May differ if electrical performance is maintained
• Mating Cycles: May exceed minimum requirement
• Operating Temperature Range: May exceed minimum requirement

The substitute part 031-4803-75 (Amphenol RF) meets all mandatory matching criteria and exceeds performance specifications in frequency capability (2 GHz vs. 500 MHz), operating temperature range (-65°C to 165°C), and mating cycles (500 cycles).

Parameter Comparison

Engineering Selection Recommendations

Both the UBJ28 and 031-4803-75 are active products with ROHS3 compliance and REACH compliance status. Selection between these parts should be based on the following factors:

UBJ28 (Cinch Connectivity Solutions Trompeter): Select when inventory availability is confirmed and application frequency requirements do not exceed 500 MHz.

031-4803-75 (Amphenol RF): Select when higher frequency capability (up to 2 GHz) is required, extended operating temperature range (-65°C to 165°C) is necessary, or when Amphenol RF supply chain availability is preferred. This part provides enhanced performance specifications while maintaining full mechanical and electrical compatibility with the UBJ28 interface requirements.

Both parts include identical packaging (3 pcs: 1 connector, 1 lockwasher, 1 nut) and maintain the same 75 ohm impedance specification critical for RF signal integrity.

Frequently Asked Questions (FAQ)

Q: Can the 031-4803-75 be used as a direct replacement for the UBJ28?

A: Yes. Both adapters share identical mechanical interfaces (BNC jack-to-jack, female-to-female, bulkhead panel mount, bayonet fastening) and electrical specifications (75 ohm impedance, gold-plated center contacts, straight configuration). The 031-4803-75 exceeds the UBJ28 performance envelope in frequency capability and operating temperature range.

Q: What are the critical parameters that must match for substitution?

A: Adapter type (jack-to-jack), connector series (BNC-to-BNC), center gender (female-to-female), impedance (75 ohms), style (straight), mounting type (panel mount with bulkhead feature), and fastening type (bayonet lock) must remain identical. These parameters ensure mechanical fit and electrical performance compatibility.

Q: Does the higher frequency rating of the 031-4803-75 affect compatibility?

A: No. Higher frequency capability is a performance enhancement that does not compromise compatibility. Applications operating at or below 500 MHz will function identically with either part.

Q: Are there packaging differences between these adapters?

A: No. Both parts include identical packaging: one connector, one lockwasher, and one nut per unit, supplied in bulk packaging.

Q: What compliance certifications apply to both parts?

A: Both the UBJ28 and 031-4803-75 are ROHS3 compliant and REACH affected. Both maintain active product status with their respective manufacturers.