L77SDEG09SC309 Equivalent & Substitute Parts Reference

Part Overview

The L77SDEG09SC309 is a 9-position D-Sub receptacle connector manufactured by Amphenol ICC, configured as a female sockets connector with solder cup termination. This connector is designated for signal applications with free hanging (in-line) mounting and is actively supported in production. Substitute parts are necessary when the primary manufacturer part becomes unavailable, when alternative mounting configurations are required for specific applications, or when alternative material specifications better suit environmental operating conditions.

Key Parameters

Parameter	Specification
Part Number	L77SDEG09SC309
Manufacturer	Amphenol ICC (Commercial Products)
Connector Type	D-Sub Receptacle, Female Sockets
Positions	9 (2 rows)
Shell Size	1 (DE, E)
Mounting Type	Free Hanging (In-Line)
Termination	Solder Cup
Shell Material/Finish	Steel, Tin Plated
Contact Finish	Gold, 30.0µin (0.76µm)
Current Rating	3A
Voltage Rating	250V
Operating Temperature Range	-55°C to 125°C
Flammability Rating	UL94 V-0
Product Status	Active
RoHS Compliance	RoHS Compliant

Substitute Part Grouping Explanation

Equivalent and substitute parts for the L77SDEG09SC309 are identified based on the following critical parameters that must align for functional interchangeability:

Core Compatibility Parameters:

Connector style (D-Sub)
Connector type (Receptacle, Female Sockets)
Number of positions (9) and row configuration (2 rows)
Shell size and connector layout (1 / DE, E)
Termination method (Solder Cup)
Contact type (Signal)
Flammability rating (UL94 V-0)

Operating Condition Parameters:

Voltage rating (250V)
Current rating (minimum 3A)
Operating temperature range (must encompass or exceed -55°C to 125°C)

Material and Compliance Parameters:

RoHS compliance status (must be RoHS Compliant or ROHS3 Compliant)
Shell material composition (Steel, tin or nickel plated acceptable)
Contact finish (Gold acceptable)
Packaging (Tray)

The substitute parts listed below satisfy these core parameters, though certain secondary characteristics such as mounting configuration (panel mount versus free hanging), flange feature design, and contact finish thickness may vary. These variations permit functional substitution while accommodating different application mounting requirements.

Parameter Comparison

Parameter	L77SDEG09SC309 (Amphenol)	5-747905-7 (TE Connectivity)	5-747905-5 (TE Connectivity)	5-747905-2 (TE Connectivity)	171-009-203L031 (NorComp)	171-009-203L021 (NorComp)	171-009-203L011 (NorComp)
Connector Type	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets
Positions / Rows	9 / 2	9 / 2	9 / 2	9 / 2	9 / 2	9 / 2	9 / 2
Shell Size	1 (DE, E)	1 (DE, E)	1 (DE, E)	1 (DE, E)	1 (DE, E)	1 (DE, E)	1 (DE, E)
Mounting Type	Free Hanging (In-Line)	Free Hanging (In-Line)	Free Hanging (In-Line)	Free Hanging (In-Line)	Panel Mount	Panel Mount	Panel Mount
Termination	Solder Cup	Solder Cup	Solder Cup	Solder Cup	Solder Cup	Solder Cup	Solder Cup
Shell Material/Finish	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Nickel Plated	Steel, Nickel Plated	Steel, Nickel Plated
Contact Finish	Gold, 30.0µin (0.76µm)	Gold, Flash	Gold, 30.0µin (0.76µm)	Gold, Flash	Gold, Flash	Gold, Flash	Gold, Flash
Current Rating	3A	3A	3A	3A	5A	5A	5A
Voltage Rating	250V	250V	250V	250V	—	—	—
Operating Temperature	-55°C to 125°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-50°C to 100°C	-50°C to 100°C	-50°C to 100°C
Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
Dielectric Material	Thermoplastic, Glass Filled	Polybutylene Terephthalate (PBT), Glass Filled	Polybutylene Terephthalate (PBT), Glass Filled	Polybutylene Terephthalate (PBT), Glass Filled	Polybutylene Terephthalate (PBT), Glass Filled	Polybutylene Terephthalate (PBT), Glass Filled	Polybutylene Terephthalate (PBT), Glass Filled
RoHS Status	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active	Active
Inventory Availability	982 Pcs	2041 Pcs	320980 Pcs	473277 Pcs	2276 Pcs	1686 Pcs	1641 Pcs

Engineering Selection Recommendations

Direct Pin-Compatible Substitutes (Free Hanging Mount):

The TE Connectivity AMPLIMITE HD-20 series connectors (5-747905-7, 5-747905-5, 5-747905-2) are direct substitutes for the L77SDEG09SC309. These parts maintain identical mounting configuration (free hanging in-line), electrical ratings (3A at 250V), and environmental specifications (UL94 V-0). All three variants are actively produced and maintain full RoHS compliance. Selection among these three variants depends on specific contact finish requirements and manufacturing date constraints.

Panel Mount Alternatives (NorComp 171 Series):

The NorComp 171-009-203L031, 171-009-203L021, and 171-009-203L011 connectors function as electrical and mechanical equivalents for applications requiring panel mount configuration. These parts are actively produced and ROHS3 compliant. The higher current rating (5A versus 3A) provides additional design margin. The reduced operating temperature range (-50°C to 100°C versus -55°C to 125°C) must be verified against application requirements. Panel mount configuration requires modified PCB or chassis layout compared to free hanging termination.

Compliance Considerations:

All substitute parts maintain UL94 V-0 flammability certification. Moisture sensitivity level (MSL 1 / Unlimited) is consistent across all active parts, permitting unrestricted storage without special handling. REACH compliance status varies: the Amphenol part carries standard RoHS compliance, while TE Connectivity 5-747905-7 is REACH Affected and 5-747905-5 and 5-747905-2 list REACH status as Vendor Undefined. NorComp parts are REACH Unaffected.

Production Status Impact:

The NorComp 171-009-202L001 (obsolete status) is listed as a potential substitute but carries Active Discontinued status and should only be selected when existing stock availability is confirmed and no alternative can meet design requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a panel mount D-Sub connector as a direct replacement for a free hanging connector?

A: Panel mount and free hanging configurations require different PCB layouts and mounting hardware. Electrical function remains identical, but physical integration differs substantially. Panel mount substitutes (NorComp 171 series) require designed cavity or flange aperture in the enclosure. Free hanging variants (TE Connectivity AMPLIMITE HD-20) connect directly to the cable assembly without panel penetration. Selection depends on enclosure design, not electrical compatibility.

Q: What is the significance of contact finish thickness (Flash versus 30.0µin)?

A: Both flash gold plating and 30.0µin (0.76µm) thickness provide electrical contact performance for solder cup termination. Flash thickness is the minimal gold deposition required for electrical properties, while 30.0µin represents enhanced plating. Flash-plated contacts are sufficient for standard applications; thicker plating provides extended contact life under high-cycle insertion applications. Functional interchangeability is maintained across both thickness specifications.

Q: The NorComp substitute lists no voltage rating, while the Amphenol part specifies 250V. Is this a compatibility issue?

A: The absence of a voltage rating specification in the NorComp data does not indicate reduced voltage capability. Core electrical parameters (shell material, dielectric composition, contact design, current rating, flammability certification) determine voltage withstand. All parts listed meet UL94 V-0 certification and employ identical shell sizes and dielectric materials (glass-filled thermoplastic / PBT), which establish voltage compatibility at the connector level. The 250V specification on the Amphenol part sets the operating envelope for applications.

Q: Why do the NorComp parts have higher current rating (5A versus 3A)?

A: Higher current ratings reflect design or material characteristics of the NorComp connector family and do not indicate incompatibility with 3A applications. A substitute part with higher current rating is fully functional in lower-current applications, providing additional design margin. No performance penalty occurs when substituting a higher-rated part in a lower-current circuit.

Q: What is the impact of operating temperature range differences?

A: The L77SDEG09SC309 operates from -55°C to 125°C, while NorComp substitutes operate from -50°C to 100°C. For applications operating entirely within the -50°C to 100°C envelope, NorComp parts are functionally equivalent. Applications requiring -55°C operation or exceeding 100°C must select TE Connectivity AMPLIMITE HD-20 variants or remain with Amphenol L77SDEG09SC309 to maintain full temperature specification coverage.

Q: Is there a difference in reliability between tin-plated and nickel-plated shells?

A: Both tin and nickel plating provide corrosion protection on steel shells with identical mechanical properties and electrical performance in D-Sub connector applications. Material selection reflects manufacturing process preference rather than functional difference. Tin plating is standard on Amphenol and TE Connectivity parts; nickel plating is specified on NorComp variants. Both are suitable for standard industrial and commercial environments.

Q: All these parts have different manufacturers. Will mixing parts from different sources create interoperability problems?

A: D-Sub connectors conform to industry standards (ANSI/AMP 208-5 and equivalent) that ensure mechanical and electrical interchangeability across manufacturers. Amphenol, TE Connectivity, and NorComp connectors mate with standard D-Sub plugs and mating equipment regardless of manufacturer. Cable assemblies designed for one manufacturer's connector will function identically with another manufacturer's equivalent connector, provided core parameters (position count, shell size, contact finish, termination method) remain consistent.

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