SA3157/1 BNC Connector Jack - Equivalent & Substitute Parts

Part Overview

The SA3157/1 is a BNC connector jack manufactured by Bulgin, designed for 50-ohm coaxial cable applications in RF and signal transmission systems. This connector features a female socket configuration with crimp termination for both center contact and shield, supporting RG58, URM43, and URM76 cable groups. The product is classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance, repair, and component sourcing.

Substiute Parts

SA3157/1

BulginIn Stock: 853SA3157/1 Datasheet

Current PartRFQ

VBI30-2051

Cinch Connectivity SolutionsIn Stock: 1081VBI30-2051 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA3157/1 is determined by strict alignment of the following critical parameters:

• Connector Style & Type: Must be BNC jack, female socket configuration
• Impedance: Must be 50 ohms for RF signal integrity
• Termination Method: Both center contact and shield must support crimp termination
• Mounting Configuration: Must be free hanging (in-line) to match mechanical installation
• Fastening Mechanism: Must use bayonet lock for mating compatibility
• Port Count: Single port requirement
• Cable Compatibility: Must support RG58 or equivalent cable groups

The substitute part VBI30-2051 from Cinch Connectivity Solutions meets all these criteria, providing functional equivalence for the obsolete SA3157/1.

Parameter Comparison

Engineering Selection Recommendations

The VBI30-2051 serves as a direct functional equivalent for the obsolete SA3157/1. Both connectors are RoHS compliant and carry MSL Level 1 rating, meeting environmental and regulatory requirements for industrial and commercial applications.

The VBI30-2051 provides enhanced specifications in several areas: extended operating temperature range (-55°C to 85°C versus -20°C to 70°C), rated voltage of 500V, and documented insertion loss of 0.2dB. These enhancements do not compromise compatibility and provide additional margin for demanding applications.

Cable compatibility is maintained through RG-58 support, which is the primary cable group shared between both connectors. The substitute part includes a strain relief component in its package, offering improved mechanical durability compared to the original configuration.

Both parts carry identical ECCN (EAR99) and HTSUS (8536.69.4010) classifications, ensuring consistent regulatory treatment in procurement and export scenarios.

Frequently Asked Questions (FAQ)

Q: Can VBI30-2051 be used as a direct replacement for SA3157/1 in existing assemblies?

A: Yes. Both connectors share identical BNC jack configuration, 50-ohm impedance, crimp termination, bayonet fastening, and free-hanging mounting. Mechanical and electrical compatibility is confirmed across all critical parameters.

Q: Are there cable compatibility differences between SA3157/1 and VBI30-2051?

A: SA3157/1 supports RG58, URM43, and URM76 cable groups. VBI30-2051 is specified for RG-58. RG-58 is the common cable type between both connectors and is suitable for standard 50-ohm RF applications. If URM43 or URM76 cables are specifically required, cable diameter and impedance characteristics should be verified against the VBI30-2051 connector specifications.

Q: What is the difference in packaging between these two parts?

A: SA3157/1 includes 3 components per connector (connector, cable gland, washer). VBI30-2051 includes 4 components per connector (connector, contact, ferrule, strain relief). The strain relief in VBI30-2051 provides additional mechanical protection during cable termination.

Q: Do both connectors meet the same compliance standards?

A: Both SA3157/1 and VBI30-2051 are RoHS compliant and carry MSL Level 1 rating. Both are classified under ECCN EAR99 and HTSUS 8536.69.4010. Regulatory treatment is equivalent for procurement and export purposes.

Q: What is the operating temperature difference, and does it affect substitution?

A: SA3157/1 operates from -20°C to 70°C. VBI30-2051 operates from -55°C to 85°C. The VBI30-2051 has an extended range that encompasses the original specification, making it suitable for applications requiring the original temperature range and for systems operating in more extreme environments.