L77TWD24W7S D-Sub Combo Receptacle 24-Position Panel Mount Connector

Part Overview

The L77TWD24W7S is a 24-position D-Sub combo receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features a female socket configuration with 17 signal positions and 7 coax or power positions, designed for panel mount applications. The connector utilizes solder cup termination and is rated for 7.5A at 300V across an operating temperature range of -55°C to 155°C.

The L77TWD24W7S is classified as an obsolete product. Locating equivalent substitute components is necessary for ongoing maintenance, repair, and legacy system support where original inventory is depleted or unavailable.

Substiute Parts

L77TWD24W7S

Amphenol ICC (Commercial Products)In Stock: 1162L77TWD24W7S Datasheet

Current PartRFQ

DDM-24W7S-A197

ITT Cannon, LLCIn Stock: 962DDM-24W7S-A197 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the L77TWD24W7S are identified based on strict electrical and mechanical compatibility criteria. The following parameters must match or be equivalent for substitution:

Critical Matching Parameters:

• Connector Style: D-Sub, Combo
• Connector Type: Receptacle, Female Sockets
• Number of Positions: 24 (17 + 7 Coax or Power)
• Shell Size, Connector Layout: 5 (DD, D) - 24W7
• Mounting Type: Panel Mount
• Termination: Solder Cup
• Current Rating: 7.5A
• Contact Finish: Gold

The DDM-24W7S-A197 manufactured by ITT Cannon, LLC satisfies all critical matching parameters. This substitute maintains identical connector geometry, position count, mounting configuration, and electrical ratings. Both components are designed for the same physical and electrical interface requirements.

Parameter Comparison

Engineering Selection Recommendations

The DDM-24W7S-A197 is the qualified substitute for the obsolete L77TWD24W7S. Selection of this substitute is based on the following engineering criteria:

Electrical and Mechanical Compatibility: Both connectors share identical connector style, type, position count, shell size, mounting configuration, and termination method. Current and contact finish specifications are equivalent.

Product Status: The DDM-24W7S-A197 maintains active product status with current manufacturing availability, addressing the obsolescence of the L77TWD24W7S.

Regulatory Compliance: Both components are EAR99 classified. The DDM-24W7S-A197 carries ROHS3 compliance, meeting current environmental standards. The L77TWD24W7S is RoHS Compliant.

Operating Temperature Consideration: The L77TWD24W7S operates to 155°C, while the DDM-24W7S-A197 operates to 125°C. Applications requiring operation above 125°C require evaluation of thermal requirements against the substitute's maximum rating.

Shell Finish Variation: The DDM-24W7S-A197 features tin-nickel plating compared to the tin plating of the L77TWD24W7S. This variation provides enhanced corrosion resistance and is compatible with standard solder cup termination processes.

Frequently Asked Questions (FAQ)

Q: Can the DDM-24W7S-A197 be used as a direct replacement for the L77TWD24W7S?

A: The DDM-24W7S-A197 is electrically and mechanically compatible with the L77TWD24W7S for applications operating within the temperature range of -55°C to 125°C. Both connectors maintain identical position count, shell size, mounting type, and termination method. Applications requiring operation above 125°C require thermal evaluation.

Q: What are the key differences between these two connectors?

A: The primary differences are: (1) Product status—the DDM-24W7S-A197 is active while the L77TWD24W7S is obsolete; (2) Operating temperature maximum—125°C versus 155°C; (3) Shell finish—tin-nickel plated versus tin plated; (4) Dielectric material—PCT versus thermoplastic; (5) Contact finish thickness—flash versus 16.0µin. All other electrical and mechanical parameters are equivalent.

Q: Are there packaging differences between these connectors?

A: The L77TWD24W7S is supplied in standard packaging, while the DDM-24W7S-A197 is supplied in bulk packaging. Bulk packaging does not affect connector performance or compatibility.

Q: What is the significance of the shell finish difference?

A: The tin-nickel plating of the DDM-24W7S-A197 provides enhanced corrosion resistance compared to the tin plating of the L77TWD24W7S. This variation is compatible with standard solder cup assembly processes and does not affect electrical performance.

Q: Does the contact finish thickness difference affect performance?

A: Both connectors feature gold contact finish. The L77TWD24W7S specifies 16.0µin thickness, while the DDM-24W7S-A197 specifies flash thickness. Both finishes provide adequate contact resistance and durability for the specified 7.5A current rating.

Q: Are both connectors RoHS compliant?

A: Yes. The L77TWD24W7S is RoHS Compliant. The DDM-24W7S-A197 is ROHS3 Compliant, meeting current environmental standards.