L77DD50SOL2 Equivalent & Substitute Parts

Part Overview

The L77DD50SOL2 is a 50-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This female socket connector features vertical solder termination and is designed for through-hole mounting applications. The connector is currently in active product status with 768 units in stock.

D-Sub connectors of this configuration are widely used in industrial control systems, data acquisition equipment, and legacy computing interfaces. Substitute parts become necessary when the primary part reaches end-of-life status, when alternative sourcing is required for supply chain continuity, or when specific performance characteristics of alternative designs better suit application requirements.

Substiute Parts

L77DD50SOL2

Amphenol ICC (Commercial Products)In Stock: 862L77DD50SOL2 Datasheet

Current PartRFQ

172-050-212R001

NorComp Inc.In Stock: 772172-050-212R001 Datasheet

SimilarRFQ

DDM50S332N

Amphenol ICC (FCI)In Stock: 871DDM50S332N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the L77DD50SOL2 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Connector type: Receptacle, Female Sockets
• Number of positions: 50
• Shell size: 5 (DD, D)
• Termination method: Solder
• Mounting configuration: Through Hole

Performance Parameters:

• Current rating: 7.5A minimum
• Voltage rating: 300V minimum
• Operating temperature range: -55°C to 125°C minimum
• Flammability rating: UL94 V-0

Material and Finish Parameters:

• Shell material: Steel with plating
• Contact material: Brass or equivalent
• Contact finish: Gold plating

Two substitute parts meet the core functional requirements with documented compatibility:

1. DDM50S332N (Amphenol ICC FCI) – Active product status, maintains electrical specifications and temperature range, alternative shell finish (yellow cadmium plated), phosphor bronze contacts
2. 172-050-212R001 (NorComp Inc.) – Obsolete product status, reduced current rating (5A), reduced temperature range (-50°C to 100°C), panel mount capability added

Parameter Comparison

Engineering Selection Recommendations

DDM50S332N Selection Criteria:

The DDM50S332N is suitable for applications where the L77DD50SOL2 reaches end-of-life or supply constraints occur. This substitute maintains identical electrical performance specifications (7.5A current rating, 300V voltage rating) and operating temperature range (-55°C to 125°C). Both connectors carry UL94 V-0 flammability certification.

Key consideration: The DDM50S332N is RoHS non-compliant and REACH-affected, whereas the L77DD50SOL2 is RoHS compliant. Applications subject to RoHS or REACH regulatory requirements must not use this substitute.

The DDM50S332N features phosphor bronze contacts with thicker gold plating (50.0µin versus 8.00µin), which may provide enhanced contact durability in high-cycle mating applications. The yellow cadmium shell finish differs from the tin-plated finish of the primary part.

172-050-212R001 Selection Criteria:

The 172-050-212R001 is not recommended as a direct substitute due to reduced electrical performance specifications. The current rating is limited to 5A (compared to 7.5A), and the operating temperature range is restricted to -50°C to 100°C (compared to -55°C to 125°C). Additionally, this part carries obsolete product status, indicating discontinued manufacturing and limited future availability.

The 172-050-212R001 does offer panel mount capability in addition to through-hole mounting, which may provide mechanical flexibility for certain enclosure designs. This part is ROHS3 compliant and REACH unaffected, making it suitable for regulatory-constrained applications if performance limitations are acceptable.

Frequently Asked Questions (FAQ)

Q: Can the DDM50S332N be used as a direct replacement for the L77DD50SOL2 in all applications?

A: The DDM50S332N matches all critical electrical and mechanical parameters (50 positions, 7.5A current rating, 300V voltage rating, -55°C to 125°C operating range, UL94 V-0 rating). However, RoHS compliance status differs. Applications requiring RoHS compliance cannot use the DDM50S332N. Contact material and shell finish also differ, which may affect performance in specific environmental or high-cycle applications.

Q: Why is the 172-050-212R001 listed as a substitute if it has reduced current rating?

A: The 172-050-212R001 is included in the substitute list because it shares the core connector architecture (50-position D-Sub receptacle, solder termination, through-hole mounting). However, the reduced current rating (5A versus 7.5A) and restricted temperature range (-50°C to 100°C versus -55°C to 125°C) make it unsuitable for applications requiring the full performance envelope of the L77DD50SOL2. This part is listed for reference only and should be selected only when application requirements fall within its reduced specifications.

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

A: The L77DD50SOL2 has 8.00µin (0.203µm) gold plating, while the DDM50S332N has 50.0µin (1.27µm) gold plating. Thicker gold plating generally provides enhanced resistance to corrosion and wear during repeated mating cycles. The 172-050-212R001 specifies flash gold plating, which is the thinnest application and suitable only for low-cycle or static applications.

Q: Are there packaging differences between these connectors?

A: Yes. The L77DD50SOL2 is supplied in tray packaging, the DDM50S332N in bulk packaging, and the 172-050-212R001 in tray packaging. Bulk packaging may require additional handling procedures for component counting and storage. Verify packaging compatibility with assembly line requirements before selection.

Q: What does "obsolete" product status mean for the 172-050-212R001?

A: Obsolete status indicates that NorComp Inc. has discontinued manufacturing of this part. While 754 units are currently in stock, future availability cannot be guaranteed. New production orders may not be fulfilled. This part should be selected only for applications where existing inventory is sufficient or where long-term supply is not a requirement.

Q: Can the L77DD50SOL2 and DDM50S332N be used interchangeably in the same circuit board design?

A: Both connectors share identical pin configurations (50 positions, 3 rows, shell size 5) and electrical ratings (7.5A, 300V). Mechanical interchangeability depends on PCB footprint design. Verify that the solder pad layout and through-hole dimensions accommodate both connector designs. Shell finish and contact material differences do not affect electrical interchangeability.

Q: Which substitute part should be selected for new designs?

A: For new designs, the L77DD50SOL2 is the recommended primary selection due to active product status and RoHS compliance. If supply constraints occur, the DDM50S332N is the preferred substitute for applications not subject to RoHS requirements. The 172-050-212R001 should not be selected for new designs due to obsolete status and reduced performance specifications.