L777DFEF09P D-Sub Connector - Equivalent & Substitute Parts

Part Overview

The L777DFEF09P is a 9-position D-Sub plug connector manufactured by Amphenol ICC (Commercial Products) with panel mount configuration. This connector features solder cup termination and is designed for applications requiring signal-level connections with a current rating of 7.5A per contact. The part is currently active in production status. Substitute parts are necessary to address supply chain requirements, obsolescence planning, or when alternative manufacturers' components meet equivalent electrical and mechanical specifications.

Substiute Parts

L777DFEF09P

Amphenol ICC (Commercial Products)In Stock: 1027L777DFEF09P Datasheet

Current PartRFQ

172-009-102R031

NorComp Inc.In Stock: 3787172-009-102R031 Datasheet

SimilarRFQ

DEP09P065TXLF

Amphenol ICC (FCI)In Stock: 1633DEP09P065TXLF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of D-Sub connectors is determined by equivalence in the following critical parameters:

Mandatory Equivalence Parameters:

• Connector style (D-Sub)
• Connector type (Plug with Male Pins)
• Number of positions (9)
• Shell size and layout (1, DE/E)
• Mounting type configuration
• Termination method (Solder Cup)

Acceptable Variation Parameters:

• Manufacturer identity
• Color of shell
• Specific flange feature design
• Contact finish thickness (if gold plated)
• Dielectric material composition (thermoplastic options)
• Wire gauge support range
• RoHS generation compliance

The substitute parts identified below maintain functional equivalence for pin count, connector geometry, electrical interface, and solder termination compatibility while differing in manufacturing source and certain mechanical or material specifications.

Parameter Comparison

Engineering Selection Recommendations

L777DFEF09P (Primary Part, Amphenol ICC Commercial Products): This is the baseline specification. The part is active in production, RoHS compliant, and suitable for applications operating within the specified electrical and temperature parameters. Current inventory of 920 units supports immediate availability.

DEP09P065TXLF (Amphenol ICC FCI - Preferred Substitute): This substitute maintains panel-to-connector interface compatibility when converted to free-hanging termination configuration. It exceeds the primary part specifications in voltage rating (1000V versus 300V) and matches the current rating of 7.5A per contact. The part is active in production status with RoHS compliance. The GXT™ gold contact finish provides enhanced durability. Operating temperature range matches the primary part (-55°C to 125°C). This substitute is suitable when higher voltage margin is required or when free-hanging termination is acceptable in the circuit design.

172-009-102R031 (NorComp Inc. - Limited Substitution): This part is classified as obsolete. The substitution parameters differ in current rating (5A versus 7.5A) and operating temperature range (-50°C to 100°C versus -55°C to 125°C). The contact finish thickness is flash gold rather than specified plating thickness. ROHS3 compliance is confirmed. This part is suitable only for applications where reduced current capacity and narrower temperature range are acceptable. The obsolete status creates long-term supply risk and limits this substitute to short-term requirements or legacy system maintenance.

Frequently Asked Questions (FAQ)

Q: Can the DEP09P065TXLF replace the L777DFEF09P directly in a panel mount application?

A: DEP09P065TXLF has free-hanging (in-line) mounting type, not panel mount. Direct mechanical replacement in panel mount configurations is not possible. However, if the circuit design permits in-line termination, the electrical interface is fully compatible (same 9-position D-Sub, 2-row DE/E configuration, solder cup termination).

Q: What are the critical compatibility parameters when selecting a substitute?

A: For D-Sub 9-position solder cup connectors, the critical parameters are: connector type (plug, male pins), shell size/layout (1, DE/E), number of positions (9), number of rows (2), and termination method (solder cup). These parameters ensure mechanical fit and electrical interface compatibility. Mounting type, current rating, voltage rating, and operating temperature range must be reviewed against application requirements.

Q: Why is the 172-009-102R031 marked as obsolete?

A: The part's obsolete status indicates the manufacturer (NorComp Inc.) has discontinued production. While the connector meets basic D-Sub 9-position specifications, the obsolete classification increases supply risk and limits availability for future requirements.

Q: How do current ratings affect part substitution?

A: The L777DFEF09P and DEP09P065TXLF both support 7.5A per contact, meeting equivalent current capacity. The 172-009-102R031 is rated for 5A, which is lower. If the application draws current approaching or exceeding 5A per contact, this substitute is not appropriate due to thermal and reliability margin loss.

Q: Are there temperature range considerations for substitution?

A: The L777DFEF09P operates from -55°C to 125°C. The DEP09P065TXLF matches this range. The 172-009-102R031 operates from -50°C to 100°C, which is narrower and excludes extreme low-temperature operation. Applications requiring -55°C operation cannot use the NorComp substitute.

Q: What is the difference between tin plating on the shell and gold plating on contacts?

A: The shell (connector body) is tin-plated steel for corrosion resistance and mechanical durability. The contact surfaces are gold-plated to ensure low contact resistance and reliable signal transmission during mating cycles. Both finish types are present on all three parts listed.

Q: Does RoHS compliance differ among the substitutes?

A: All three parts are RoHS compliant. The L777DFEF09P and DEP09P065TXLF are RoHS Compliant (first generation). The 172-009-102R031 is ROHS3 Compliant (third generation). Both designations confirm absence of restricted substances per applicable RoHS directives.