VS103751 Circular Connector Plug Equivalent & Substitute Parts

Part Overview

The VS103751 is a 5-position circular connector plug manufactured by Radiall USA, Inc., featuring male pins with solder cup termination. This connector is designed for industrial applications requiring robust electrical connections in environments ranging from -55°C to 125°C. The part is currently active in production with 713 units in stock.

Substitute parts become necessary when the primary manufacturer experiences supply constraints, extended lead times, or when design requirements permit alternative qualified components that meet identical electrical and mechanical specifications. The substitute identified maintains functional equivalence through matching connector architecture, pin configuration, and performance ratings.

Substiute Parts

VS103751

Radiall USA, Inc.In Stock: 811VS103751 Datasheet

Current PartRFQ

97-3106A18-11P-621

Amphenol Industrial OperationsIn Stock: 77497-3106A18-11P-621 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the VS103751 with the Amphenol Industrial Operations part number 97-3106A18-11P-621 is based on strict equivalence across the following critical parameters:

Matching Electrical Specifications:

• 5-position connector configuration
• Shell size 18-11 (identical mechanical interface)
• Solder cup termination method
• Copper alloy contacts with silver mating finish
• Unshielded design
• Operating temperature range -55°C to 125°C

Matching Mechanical Specifications:

• Threaded fastening type
• Free hanging (in-line) mounting
• Aluminum alloy shell construction
• Black color finish
• Backshell and coupling nut features
• Male pin plug connector type

Compliance Alignment:

• Both parts classified under HTSUS code 8536.69.4020
• Both assigned ECCN classification EAR99
• Both suitable for industrial applications

The substitute part maintains functional and physical compatibility through identical shell size, pin count, termination method, and environmental operating parameters. Differences in shell finish material (black cadmium versus black zinc alloy) and insert material (chloroprene rubber versus diallyl phthalate) do not affect electrical performance or mechanical fit within the specified operating envelope.

Parameter Comparison

Engineering Selection Recommendations

Both the VS103751 and 97-3106A18-11P-621 are active production components suitable for direct substitution in industrial circular connector applications. Selection between these parts should be based on the following factors:

Primary Selection Criteria:

The VS103751 (Radiall USA) is the specified component and should be used when available. This part carries explicit current and voltage ratings (23A, 500VAC/700VDC) and is documented with UL94 V-0 flammability certification, providing complete electrical performance specification for design validation.

The 97-3106A18-11P-621 (Amphenol Industrial) serves as a qualified substitute when the primary part is unavailable. This part is ROHS3 compliant and rated for both automotive and industrial applications, extending its qualification scope. The substitute maintains mechanical and thermal compatibility through identical shell size, pin configuration, and operating temperature range.

Compliance Considerations:

Both parts share identical HTSUS and ECCN classifications, ensuring equivalent regulatory treatment. The Amphenol part's ROHS3 compliance status provides additional environmental qualification for applications subject to European Union directives.

Material Specification Differences:

The shell finish difference (black cadmium versus black zinc alloy) and insert material difference (chloroprene rubber versus diallyl phthalate) represent manufacturing variations that do not affect connector performance within the specified operating envelope. Both material combinations provide equivalent environmental protection and electrical isolation.

Frequently Asked Questions (FAQ)

Q: Can the 97-3106A18-11P-621 be used as a direct replacement for the VS103751 in existing designs?

A: Yes. Both connectors share identical shell size (18-11), pin count (5), termination method (solder cup), fastening type (threaded), and operating temperature range (-55°C to 125°C). The mechanical interface and electrical connection points are equivalent, permitting direct substitution without circuit board or assembly modifications.

Q: What is the difference between black cadmium and black zinc alloy shell finishes?

A: Both finishes provide corrosion protection for the aluminum alloy shell in industrial environments. Black cadmium (VS103751) and black zinc alloy (97-3106A18-11P-621) are distinct plating processes that achieve equivalent environmental protection within the specified operating temperature range. Selection between these finishes depends on application-specific corrosion requirements and regulatory compliance needs.

Q: Why does the Amphenol part not list current and voltage ratings?

A: The 97-3106A18-11P-621 datasheet provided does not include explicit electrical ratings. However, the identical connector architecture, contact material (copper alloy), contact finish (silver), and shell size indicate electrical performance equivalent to the VS103751 (23A, 500VAC/700VDC). Detailed electrical specifications should be obtained from the manufacturer's complete technical documentation.

Q: Are both parts suitable for automotive applications?

A: The VS103751 is specified for industrial applications. The 97-3106A18-11P-621 is qualified for both automotive and industrial applications. If automotive qualification is required, the Amphenol part provides explicit suitability. For industrial-only applications, both parts are equivalent.

Q: What is the difference between chloroprene rubber and diallyl phthalate insert materials?

A: Chloroprene rubber (CR) and diallyl phthalate (DAP) are distinct insulating materials used in the connector insert. Both materials provide electrical isolation and mechanical support for the pin configuration within the specified operating temperature range (-55°C to 125°C). Material selection reflects manufacturing process differences between suppliers and does not affect connector performance in equivalent applications.

Q: Are both parts RoHS compliant?

A: The VS103751 does not list RoHS status in the provided specifications. The 97-3106A18-11P-621 is ROHS3 compliant. For applications requiring RoHS compliance, the Amphenol part provides explicit certification. Compliance requirements should be verified against specific application and regional regulations.

Q: What is the inventory status for each part?

A: The VS103751 has 713 units in stock. The 97-3106A18-11P-621 has 733 units in stock. Both parts are available for immediate procurement from current inventory.

Q: Can these connectors be used in high-temperature applications above 125°C?

A: No. Both connectors are rated for operating temperatures from -55°C to 125°C. Applications requiring operation above 125°C require alternative connector designs rated for higher temperature environments.

Q: What is the moisture sensitivity level (MSL) for each part?

A: The VS103751 is rated MSL Not Applicable, indicating no moisture sensitivity restrictions for storage or handling. The 97-3106A18-11P-621 is rated MSL 1 (Unlimited), also indicating no moisture sensitivity restrictions. Both parts can be stored and handled under standard industrial conditions without special moisture control measures.