L77SDCG37SC309 Equivalent & Substitute Parts

Part Overview

The L77SDCG37SC309 is a 37-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features female sockets with solder cup termination and is designed for applications requiring robust signal transmission in industrial and commercial environments. The product maintains active status with 982 units available in original packaging. Equivalent and substitute parts may be required for supply chain diversification, design flexibility, or when specific manufacturing or performance requirements necessitate alternative connector configurations.

Substiute Parts

L77SDCG37SC309

Amphenol ICC (Commercial Products)In Stock: 1082L77SDCG37SC309 Datasheet

Current PartRFQ

171-037-203L001

NorComp Inc.In Stock: 1417171-037-203L001 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the L77SDCG37SC309 with the NorComp 171-037-203L001 is based on alignment of critical parameters: both connectors feature 37-position D-Sub configurations with female sockets, identical shell size (4/DC/C), and solder cup termination. Both parts maintain UL94 V-0 flammability ratings and support gold-plated contacts. However, substitution involves specific trade-offs documented in the parameter comparison section below. The primary substitution criterion is mechanical and electrical compatibility determined by connector style, position count, shell size, and termination method. Secondary parameters including mounting type, shell finish, current rating, and operating temperature ranges must be evaluated within the context of the specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Both connectors maintain active product status and comply with RoHS requirements, with the NorComp part achieving ROHS3 status. The L77SDCG37SC309 supports a wider operating temperature range (-55°C to 125°C) compared to the substitute (-50°C to 100°C), requiring assessment for applications with extended temperature extremes. The L77SDCG37SC309 provides specified contact finish thickness (30.0µin/0.76µm), while the NorComp part specifies flash gold coating. Both maintain UL94 V-0 flammability ratings. The primary mechanical difference is mounting configuration: the Amphenol part is free hanging (in-line), while the NorComp alternative is panel mount. Current rating differs (3A versus 5A), affecting maximum design current. Shell finish differs (tin versus nickel plating). Selection between these parts must align with specific application requirements regarding mounting approach, thermal environment, and current requirements.

Frequently Asked Questions (FAQ)

Q: Can the NorComp 171-037-203L001 be used as a direct replacement for the L77SDCG37SC309 in all applications?

A: No. While both are 37-position D-Sub receptacles with identical shell size and solder cup termination, they differ in mounting type (in-line versus panel mount), operating temperature range, current rating, and shell finish. Direct substitution is valid only when application requirements accommodate these differences.

Q: How do the different shell finishes (tin versus nickel plating) affect connector performance?

A: Tin plating on the L77SDCG37SC309 and nickel plating on the 171-037-203L001 provide corrosion resistance for different environmental conditions. Selection depends on specific application environment and mating frequency requirements.

Q: What is the significance of the contact finish thickness specification?

A: The L77SDCG37SC309 specifies 30.0µin (0.76µm) gold plating, while the NorComp part specifies flash gold. Gold thickness affects contact wear characteristics and longevity under repeated mating cycles. Applications with high mating frequency may require the thicker gold specification.

Q: Are both connectors suitable for high-temperature applications?

A: The L77SDCG37SC309 operates to 125°C maximum, while the 171-037-203L001 operates to 100°C maximum. Applications approaching or exceeding 100°C require the Amphenol part. Neither connector is rated for temperatures below -50°C; the Amphenol part extends to -55°C.

Q: What packaging is provided for both parts?

A: Both connectors are supplied in tray packaging, supporting manufacturing and assembly processes. The L77SDCG37SC309 has 982 units available, while the 171-037-203L001 has 1372 units available in original stock.

Q: How do the different dielectric materials affect connector reliability?

A: The L77SDCG37SC309 uses thermoplastic glass-filled dielectric material, while the 171-037-203L001 uses polybutylene terephthalate (PBT) glass-filled material. Both provide electrical insulation and mechanical support with glass reinforcement. PBT offers improved dimensional stability and chemical resistance in certain environments.