L77TWA7W2SSY D-Sub Combo Receptacle Equivalent & Substitute Parts

Part Overview

The L77TWA7W2SSY is a 7-position D-Sub combo receptacle connector manufactured by Amphenol ICC (Commercial Products). This panel-mount, solder-termination connector features female sockets in a 2-row configuration (5 + 2 Coax or Power positions) with a 2 (DA, A) shell size layout. The connector is in Active product status and maintains RoHS Compliance with unlimited moisture sensitivity rating. Finding equivalent substitute parts addresses inventory availability, supply chain resilience, and project-specific requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

L77TWA7W2SSY

Amphenol ICC (Commercial Products)In Stock: 799L77TWA7W2SSY Datasheet

Current PartRFQ

681S7W2203L001

NorComp Inc.In Stock: 1041681S7W2203L001 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the L77TWA7W2SSY is determined by strict matching of core electrical and mechanical parameters. The substitute part 681S7W2203L001 (NorComp Inc., Seal-D 681S series) qualifies as an equivalent based on the following mandatory matching criteria:

• Connector Style & Type: Both are D-Sub combo receptacles with female sockets
• Position Configuration: Both provide 7-position configurations in 2-row layout (5 + 2)
• Shell Size Layout: Both use 2 (DA, A) - 7W2 configuration
• Mounting: Both feature panel mount, through-hole installation
• Termination Method: Both use solder termination
• Color: Both are black
• Operating Temperature: Both operate across -55°C to 155°C range
• RoHS Compliance: Both meet RoHS standards
• Moisture Sensitivity: Both rated at MSL 1 (Unlimited)
• ECCN Classification: Both classified as EAR99
• HTSUS Code: Both assigned 8536.69.4040

Parameter Comparison

Engineering Selection Recommendations

The 681S7W2203L001 from NorComp Inc. is qualified as a direct substitute for the L77TWA7W2SSY. Both connectors maintain Active product status and satisfy RoHS compliance requirements. The NorComp substitute provides additional IP67 ingress protection and UL94 V-0 flammability rating, which may exceed application requirements but does not create incompatibility. The 681S7W2203L001 features nickel-plated steel shells versus the tin-plated finish of the Amphenol connector, and a flash gold contact finish versus 16.0µin thickness on the primary part. Current rating options on the substitute (5A and 40A) span the 7.5A specification of the original. Contact material composition differs (copper alloy versus bronze), but both provide appropriate electrical conductivity for D-Sub applications. The substitute dielectric material (PBT) differs from the thermoplastic specification of the original, representing a higher-performance polymer with superior thermal and chemical resistance. Selection between these parts depends on application-specific requirements for environmental protection, current handling, and connector housing material preference.

Frequently Asked Questions (FAQ)

Q: What makes the 681S7W2203L001 compatible with designs using the L77TWA7W2SSY?

A: Both connectors share the same shell size layout (2 (DA, A) - 7W2), position configuration (7 positions in 2-row arrangement), mounting method (panel mount, through-hole), and termination type (solder). These parameters ensure mechanical and electrical interchangeability in circuit designs and PCB layouts.

Q: Are there differences in electrical performance between these parts?

A: The L77TWA7W2SSY specifies 7.5A at 300V. The 681S7W2203L001 provides dual current ratings of 5A and 40A, with voltage rating not specified in available documentation. Application requirements determine whether the 5A rating is limiting or the 40A option provides headroom. Voltage ratings should be verified against application specifications before substitution.

Q: What is the significance of shell material finish differences?

A: The L77TWA7W2SSY uses tin-plated steel shells, while the 681S7W2203L001 uses nickel-plated steel. Both finishes provide corrosion resistance appropriate for D-Sub connectors. Nickel plating offers enhanced durability in corrosive environments. Material finish selection depends on application environment and assembly soldering processes.

Q: Does the IP67 rating on the substitute part create compatibility issues?

A: No. The IP67 rating on the 681S7W2203L001 represents an enhanced environmental sealing capability that exceeds the specification of the original part. Applications not requiring IP67 protection are fully compatible, and applications requiring environmental sealing benefit from this specification.

Q: Are the different dielectric materials compatible?

A: Yes. The L77TWA7W2SSY uses thermoplastic dielectric material, while the 681S7W2203L001 uses PBT (polybutylene terephthalate). Both materials meet the operating temperature range (-55°C to 155°C), moisture sensitivity requirements (MSL 1), and RoHS compliance. PBT provides superior thermal stability and chemical resistance.

Q: What packaging considerations apply to these parts?

A: Both the L77TWA7W2SSY and 681S7W2203L001 are supplied in tray packaging. Inventory availability differs (711 pieces for Amphenol, 976 pieces for NorComp). Packaging does not affect electrical or mechanical substitution.

Q: How do the compliance certifications compare?

A: Both parts are RoHS compliant (L77TWA7W2SSY: RoHS Compliant; 681S7W2203L001: ROHS3 Compliant). The 681S7W2203L001 carries REACH Unaffected status. Both are classified as EAR99 and assigned HTSUS code 8536.69.4040. Compliance differences do not affect substitution eligibility.

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