L77HDDG78SOL2C309 Equivalent & Substitute Parts

Part Overview

The L77HDDG78SOL2C309 is a 78-position D-Sub high-density receptacle connector manufactured by Amphenol ICC. This female socket connector features vertical solder termination and board-side M3 flange mounting. The connector is designed for signal applications requiring high-density interconnection in through-hole configurations. The part maintains active product status and is RoHS compliant with unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical and mechanical parameters are required for applications where the primary part is unavailable or when alternative form factors are acceptable within design constraints.

Substiute Parts

L77HDDG78SOL2C309

Amphenol ICC (Commercial Products)In Stock: 881L77HDDG78SOL2C309 Datasheet

Current PartRFQ

09641147212

HARTINGIn Stock: 92609641147212 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of D-Sub connectors is determined by compatibility across the following critical parameters: connector type (receptacle vs. plug), number of positions, shell size and density classification, mounting configuration, termination method, voltage and current ratings, and operating temperature range. The substitute part 09641147212 from HARTING differs significantly in multiple core parameters and does not qualify as a direct equivalent substitute for the L77HDDG78SOL2C309.

The 09641147212 is a 9-position D-Sub receptacle with shell size 1 (DE, E) configuration, whereas the L77HDDG78SOL2C309 is a 78-position high-density connector with shell size 5 (DD, D) configuration. Position count and shell size are non-interchangeable parameters that define the physical and electrical interface. The voltage rating of 09641147212 is 100V compared to 250V for the main part. The current rating of 09641147212 is 7.5A compared to 3A for the main part. The operating temperature range of 09641147212 is -20°C ~ 125°C compared to -55°C ~ 155°C for the main part. These differences preclude functional equivalence in applications requiring the specific electrical and thermal characteristics of the L77HDDG78SOL2C309.

Parameter Comparison

Engineering Selection Recommendations

The L77HDDG78SOL2C309 maintains active product status with RoHS compliance and unlimited moisture sensitivity rating (MSL 1). The part is manufactured by Amphenol ICC, a primary supplier of D-Sub connectors, with 855 units in current inventory.

The substitute part 09641147212 from HARTING is also active and RoHS3 compliant with unlimited moisture sensitivity rating. However, this part does not provide functional equivalence to the L77HDDG78SOL2C309 due to incompatible core parameters. The 9-position configuration and shell size 1 layout are fundamentally different from the 78-position high-density shell size 5 configuration. The reduced voltage rating (100V vs. 250V), different current rating (7.5A vs. 3A), and narrower operating temperature range (-20°C ~ 125°C vs. -55°C ~ 155°C) further preclude substitution in applications designed for the L77HDDG78SOL2C309 specifications.

For applications requiring a 78-position high-density D-Sub receptacle with the specified electrical and thermal characteristics, the L77HDDG78SOL2C309 is the appropriate selection. Alternative sources should be evaluated based on matching all critical parameters: 78-position count, shell size 5 high-density configuration, 250V voltage rating, 3A current rating, -55°C ~ 155°C operating temperature range, and solder termination.

Frequently Asked Questions (FAQ)

Q: Can the 09641147212 be used as a direct replacement for the L77HDDG78SOL2C309?

A: No. The 09641147212 is a 9-position connector with shell size 1 configuration, while the L77HDDG78SOL2C309 is a 78-position high-density connector with shell size 5 configuration. These are physically and electrically incompatible. Position count and shell size define the connector interface and cannot be interchanged.

Q: What are the critical parameters that determine D-Sub connector substitution?

A: Critical parameters include: number of positions, shell size and density classification, connector type (receptacle vs. plug), mounting configuration (vertical vs. right angle), termination method, voltage rating, current rating, and operating temperature range. All of these parameters must match or exceed application requirements for substitution to be valid.

Q: Does the 09641147212 have better electrical ratings than the L77HDDG78SOL2C309?

A: The 09641147212 has a higher current rating (7.5A vs. 3A) but a lower voltage rating (100V vs. 250V). These are different electrical characteristics designed for different application classes and are not directly comparable as "better" or "worse." The appropriate part depends on the specific application requirements.

Q: Are both connectors RoHS compliant?

A: Yes. The L77HDDG78SOL2C309 is RoHS compliant. The 09641147212 is ROHS3 compliant. Both meet current RoHS requirements.

Q: What is the operating temperature difference between these connectors?

A: The L77HDDG78SOL2C309 operates from -55°C to 155°C, providing a 210°C operating range. The 09641147212 operates from -20°C to 125°C, providing a 145°C operating range. Applications requiring operation below -20°C or above 125°C require the L77HDDG78SOL2C309.

Q: Can the right-angle mounting of the 09641147212 be adapted for vertical mounting applications?

A: No. Mounting type is a fundamental design characteristic. Right-angle connectors are designed for edge-card or perpendicular PCB mounting, while vertical connectors are designed for parallel PCB mounting. These configurations cannot be interchanged without redesigning the PCB layout and connector interface.