L77HDD78SVFC309 Equivalent & Substitute Parts

Part Overview

The L77HDD78SVFC309 is a 78-position D-Sub high-density receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features female sockets with solder cup termination and is designed for free-hanging, in-line mounting applications. The connector is currently active in production with 871 pieces in stock inventory.

Substitute parts are identified when equivalent D-Sub high-density receptacle connectors from alternative manufacturers meet the core electrical and mechanical specifications required for the application. The primary differences among substitute options relate to mounting configuration, current rating capacity, and shell material finish.

Substiute Parts

L77HDD78SVFC309

Amphenol ICC (Commercial Products)In Stock: 905L77HDD78SVFC309 Datasheet

Current PartRFQ

180-078-203L001

NorComp Inc.In Stock: 1036180-078-203L001 Datasheet

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180-078-203L011

NorComp Inc.In Stock: 803180-078-203L011 Datasheet

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180-078-203L021

NorComp Inc.In Stock: 932180-078-203L021 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the L77HDD78SVFC309 are qualified based on the following core parameters that must remain constant across all equivalent options:

Fixed Parameters (Must Match):

• Connector style: D-Sub, High Density
• Connector type: Receptacle, Female Sockets
• Number of positions: 78
• Number of rows: 4
• Shell size and layout: 5 (DD, D) High Density
• Termination method: Solder Cup
• Contact type: Signal
• Material flammability rating: UL94 V-0

Variable Parameters (Allowed to Differ):

• Mounting type (free-hanging in-line versus panel mount)
• Current rating (3A versus 5A)
• Shell material finish (tin plated versus nickel plated)
• Contact finish thickness (30.0µin versus flash)
• Dielectric material (thermoplastic glass-filled versus polybutylene terephthalate)
• Contact material (phosphor bronze versus brass)
• Operating temperature range
• Manufacturer and base product number

The three substitute parts identified (180-078-203L001, 180-078-203L011, 180-078-203L021) are all manufactured by NorComp Inc. and maintain the critical connector geometry, position count, and electrical characteristics required for functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: L77HDD78SVFC309

The L77HDD78SVFC309 is the specified component for applications requiring free-hanging, in-line mounting configuration with mating-side female screwlock flanges. This part maintains active production status and is RoHS compliant. The extended operating temperature range of -55°C to 155°C and MSL rating of 1 (unlimited) support deployment in demanding environmental conditions.

Substitute Part 180-078-203L001

The 180-078-203L001 is suitable for panel-mount applications where an unthreaded housing/shell flange is acceptable. This part maintains the 3A current rating of the primary part and is ROHS3 compliant. The operating temperature range is reduced to -50°C to 100°C. Selection of this part requires confirmation that the panel-mount configuration and reduced temperature range are compatible with the application requirements.

Substitute Parts 180-078-203L011 and 180-078-203L021

Both 180-078-203L011 and 180-078-203L021 are panel-mount configurations with cable-side (4-40) flanges and support a higher current rating of 5A compared to the primary part's 3A rating. These parts are ROHS3 compliant with operating temperature range of -50°C to 100°C. The increased current capacity provides design margin for applications with higher current requirements. Selection of these parts requires confirmation that the panel-mount configuration and reduced temperature range are compatible with the application requirements.

Compliance Considerations

All identified substitute parts maintain UL94 V-0 material flammability rating and are compliant with applicable RoHS directives. The primary part carries RoHS compliance status, while substitute parts carry ROHS3 compliance status. All parts are classified under ECCN EAR99 and HTSUS 8536.69.8000.

Frequently Asked Questions (FAQ)

Q: Can the 180-078-203L001 be used as a direct replacement for the L77HDD78SVFC309?

A: The 180-078-203L001 maintains the same 78-position, high-density D-Sub receptacle configuration and solder cup termination. However, it differs in mounting type (panel mount versus free-hanging in-line) and flange feature (unthreaded housing versus mating-side female screwlock). Substitution is valid only if the application can accommodate panel mounting and does not require the mating-side screwlock feature.

Q: What is the difference between the 180-078-203L011 and 180-078-203L021?

A: Both parts are functionally equivalent. They share identical electrical specifications, mounting configuration (panel mount), flange feature (cable side 4-40), current rating (5A), and operating temperature range (-50°C to 100°C). Both are manufactured by NorComp Inc. and are ROHS3 compliant. Selection between these two parts may be based on inventory availability or procurement lead time.

Q: Why does the L77HDD78SVFC309 have a higher operating temperature range than the NorComp substitutes?

A: The operating temperature range is determined by the dielectric material and overall connector design. The L77HDD78SVFC309 uses thermoplastic glass-filled dielectric material and supports -55°C to 155°C operation. The NorComp substitutes use polybutylene terephthalate (PBT) dielectric material and support -50°C to 100°C operation. Applications requiring operation outside the -50°C to 100°C range must use the primary part or confirm that the reduced temperature range is acceptable.

Q: Can I use the 180-078-203L011 or 180-078-203L021 in place of the L77HDD78SVFC309 if my application requires higher current capacity?

A: The 180-078-203L011 and 180-078-203L021 both support 5A current rating compared to the primary part's 3A rating. However, substitution requires confirmation that the panel-mount configuration is compatible with your application and that the reduced operating temperature range (-50°C to 100°C) meets your environmental requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. The primary part L77HDD78SVFC309 is RoHS compliant. All three substitute parts (180-078-203L001, 180-078-203L011, 180-078-203L021) are ROHS3 compliant. All parts meet applicable RoHS directives.

Q: What is the significance of the contact finish thickness difference between the primary part and substitutes?

A: The L77HDD78SVFC309 specifies a contact finish thickness of 30.0µin (0.76µm), while the NorComp substitutes specify flash gold plating. Both finishes provide gold contact surfaces for signal integrity. The flash finish on substitute parts represents a thinner gold layer. Substitution is valid when the application does not require the specific 30.0µin thickness specification.

Q: Can I use the 180-078-203L001 for applications requiring the full -55°C to 155°C temperature range?

A: No. The 180-078-203L001 is rated for -50°C to 100°C operation only. Applications requiring operation at temperatures below -50°C or above 100°C must use the primary part L77HDD78SVFC309 or confirm that operation within the reduced temperature range is acceptable.

Q: What are the key differences in flange features among these connectors?

A: The L77HDD78SVFC309 features a mating-side female screwlock (4-40) flange. The 180-078-203L001 features an unthreaded housing/shell flange. The 180-078-203L011 and 180-078-203L021 feature cable-side (4-40) flanges. These differences affect how the connector is mounted and secured in the application. Selection depends on the specific mounting requirements of your design.