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DDM50SN 50 Position D-Sub Receptacle Equivalent & Substitute Parts
Part Overview
The DDM50SN is a 50 position D-Sub receptacle connector manufactured by Amphenol ICC (FCI) with female sockets and solder cup termination. This connector is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance, repairs, and new designs requiring compatible alternatives. The DDM50SN operates at 300V with a 7.5A per contact current rating and supports operating temperatures from -55°C to 155°C. Substitute parts must maintain electrical and mechanical compatibility while accommodating modern component availability and compliance requirements.
Substiute Parts
Key Parameters
| Parameter | DDM50SN Value |
|---|---|
| Connector Type | Receptacle, Female Sockets |
| Number of Positions | 50 |
| Number of Rows | 3 |
| Shell Size, Connector Layout | 5 (DD, D) |
| Mounting Type | Free Hanging (In-Line) |
| Termination | Solder Cup |
| Flange Feature | Housing/Shell (Unthreaded) |
| Current Rating (Amps) | 7.5A per Contact |
| Voltage Rating | 300V |
| Operating Temperature | -55°C ~ 155°C |
| Contact Material | Brass |
| Contact Finish | Gold |
| Shell Material, Finish | Steel, Yellow Cadmium Plated |
| Dielectric Material | Thermoplastic |
| Material Flammability Rating | UL94 V-0 |
| RoHS Status | RoHS non-compliant |
Substitute Part Grouping Explanation
Substitution for the DDM50SN is determined by strict adherence to the following electrical and mechanical parameters:
Critical Compatibility Parameters:
- Connector type: Receptacle, Female Sockets
- Position count: 50 positions
- Row configuration: 3 rows
- Shell size and layout: 5 (DD, D)
- Mounting style: Free Hanging (In-Line)
- Termination method: Solder Cup
- Flange feature: Housing/Shell (Unthreaded)
- Current rating: 7.5A per contact minimum
- Voltage rating: 300V minimum
- Operating temperature range: -55°C to 155°C minimum
- Contact material: Brass
- Contact finish: Gold
- Dielectric material: Thermoplastic
- Flammability rating: UL94 V-0
Substitute parts are grouped into two categories based on these parameters:
Category A - Direct Electrical and Mechanical Equivalents (Highest Compatibility): Parts that maintain all critical parameters including current rating (7.5A), voltage rating (300V), operating temperature range (-55°C to 155°C), contact material (Brass), and dielectric material (Thermoplastic). These parts are L77DD50S and L77DDF50S.
Category B - Functional Substitutes with Parameter Variations (Conditional Compatibility): Parts that maintain core mechanical compatibility (50 positions, 3 rows, shell size 5, free hanging mounting, solder cup termination, unthreaded housing) but differ in current rating (3A to 5A), voltage rating (250V), operating temperature range (-55°C to 125°C), contact material (Phosphor Bronze or Copper Alloy), or dielectric material (DAP or Thermoplastic Glass Filled). These include DDM50S, L177DD50S, L177SDD50SVF, L177SDD50SVFM, and L177SDDG50S.
Category C - Mechanical Variants (Panel Mount Configuration): Parts that maintain electrical specifications but differ in mounting type (Panel Mount instead of Free Hanging). These include L177DFD50S, L77DDF50S, L77DFD50S, and L77DFDF50S.
Parameter Comparison
| Parameter | DDM50SN | L77DD50S | L77DDF50S | DDM50S | L177DD50S | L177SDD50SVF | L177SDD50SVFM | L177SDDG50S |
|---|---|---|---|---|---|---|---|---|
| Connector Type | Receptacle, Female Sockets | Receptacle, Female Sockets | Receptacle, Female Sockets | Receptacle, Female Sockets | Receptacle, Female Sockets | Receptacle, Female Sockets | Receptacle, Female Sockets | Receptacle, Female Sockets |
| Number of Positions | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 |
| Number of Rows | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Shell Size, Connector Layout | 5 (DD, D) | 5 (DD, D) | 5 (DD, D) | 5 (DD, D) | 5 (DD, D) | 5 (DD, D) | 5 (DD, D) | 5 (DD, D) |
| Mounting Type | Free Hanging (In-Line) | Free Hanging (In-Line) | Panel Mount, Through Hole | Free Hanging (In-Line) | Free Hanging (In-Line) | Free Hanging (In-Line) | Free Hanging (In-Line) | Free Hanging (In-Line) |
| Termination | Solder Cup | Solder Cup | Solder | Solder Cup | Solder Cup | Solder Cup | Solder Cup | Solder Cup |
| Flange Feature | Housing/Shell (Unthreaded) | Housing/Shell (Unthreaded) | Housing/Shell (Unthreaded) | Housing/Shell (Unthreaded) | Housing/Shell (Unthreaded) | Mating Side, Female Screwlock (4-40) | Mating Side, Female Screwlock (M3) | Cable Side (M3) |
| Current Rating (Amps) | 7.5A | 7.5A | 7.5A | 5A | 7.5A | 3A | 3A | 3A |
| Voltage Rating | 300V | 300V | 300V | — | 300V | 250V | 250V | 250V |
| Operating Temperature | -55°C ~ 155°C | -55°C ~ 125°C | -55°C ~ 155°C | -65°C ~ 125°C | -55°C ~ 125°C | -55°C ~ 125°C | -55°C ~ 125°C | -55°C ~ 125°C |
| Contact Material | Brass | Brass | Brass | Phosphor Bronze | Brass | Phosphor Bronze | Phosphor Bronze | Phosphor Bronze |
| Contact Finish | Gold | Gold | Gold | Gold | Gold | Gold | Gold | Gold |
| Shell Material, Finish | Steel, Yellow Cadmium Plated | Steel, Tin Plated | Steel, Tin Plated | Steel, Yellow Chromate Plated Zinc | Steel, Tin Plated | Steel, Tin Plated | Steel, Tin Plated | Steel, Tin Plated |
| Dielectric Material | Thermoplastic | Thermoplastic, Glass Filled | Thermoplastic, Glass Filled | Diallyl Phthalate (DAP), Glass Filled | Thermoplastic, Glass Filled | Thermoplastic, Glass Filled | Thermoplastic, Glass Filled | Thermoplastic, Glass Filled |
| Material Flammability Rating | UL94 V-0 | UL94 V-0 | UL94 V-0 | UL94 V-0 | UL94 V-0 | UL94 V-0 | UL94 V-0 | UL94 V-0 |
| RoHS Status | RoHS non-compliant | RoHS Compliant | RoHS Compliant | RoHS non-compliant | RoHS Compliant | RoHS Compliant | RoHS Compliant | RoHS Compliant |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
For Direct Replacement (Highest Compatibility):
L77DD50S is the primary substitute for DDM50SN applications requiring free hanging in-line mounting with unthreaded housing. This part maintains the 7.5A current rating, 300V voltage rating, and brass contact material. The operating temperature range is -55°C to 125°C, which covers the lower end of the DDM50SN range but does not extend to 155°C. L77DD50S is RoHS compliant and active in production, ensuring long-term availability.
L77DDF50S provides equivalent electrical specifications (7.5A, 300V, brass contacts) with panel mount through-hole termination. This part extends the operating temperature range to -55°C to 155°C, matching the DDM50SN specification. L77DDF50S is RoHS compliant and active in production.
For Applications with Reduced Current Requirements:
L177DD50S maintains 7.5A current rating and 300V voltage rating with brass contacts and thermoplastic glass-filled dielectric. Operating temperature range is -55°C to 125°C. This part is RoHS compliant and active in production.
For Applications with Reduced Electrical Specifications:
DDM50S (Cinch Connectivity Solutions) provides 5A current rating with unspecified voltage rating. Operating temperature range is -65°C to 125°C. This part is RoHS non-compliant and active in production. Use only when current requirements do not exceed 5A.
L177SDD50SVF, L177SDD50SVFM, and L177SDDG50S provide 3A current rating and 250V voltage rating. These parts are suitable only for applications with reduced power requirements. All three are RoHS compliant and active in production.
Compliance Considerations:
The DDM50SN is RoHS non-compliant. Most substitute parts (L77DD50S, L77DDF50S, L177DD50S, L177SDD50SVF, L177SDD50SVFM, L177SDDG50S) are RoHS compliant, supporting modern regulatory requirements. DDM50S remains RoHS non-compliant.
Frequently Asked Questions (FAQ)
Q: Can L77DD50S directly replace DDM50SN in all applications?
A: L77DD50S maintains mechanical compatibility (50 positions, 3 rows, shell size 5, free hanging mounting, solder cup termination, unthreaded housing) and electrical specifications (7.5A current rating, 300V voltage rating, brass contacts, gold finish). The operating temperature range is -55°C to 125°C, which does not extend to the DDM50SN maximum of 155°C. Use L77DD50S only in applications where the maximum operating temperature does not exceed 125°C.
Q: What is the difference between L77DDF50S and L77DD50S?
A: L77DDF50S differs in mounting type (panel mount through-hole) and termination method (solder instead of solder cup). L77DDF50S extends the operating temperature range to -55°C to 155°C, matching the DDM50SN specification. L77DD50S is free hanging in-line with solder cup termination and operates to 125°C. Select based on mounting requirements and temperature specifications.
Q: Why do L177SDD50SVF, L177SDD50SVFM, and L177SDDG50S have lower current ratings?
A: These parts have 3A current rating compared to the DDM50SN 7.5A rating. They are suitable only for applications where the total current per contact does not exceed 3A. The voltage rating is also reduced to 250V. These parts include additional flange features (female screwlock or cable side M3) not present in the DDM50SN.
Q: Is DDM50S a suitable substitute?
A: DDM50S (Cinch Connectivity Solutions) maintains mechanical compatibility but reduces the current rating to 5A and does not specify a voltage rating. The operating temperature range extends to -65°C but is limited to 125°C maximum. DDM50S is RoHS non-compliant, matching the DDM50SN compliance status. Use only when current requirements do not exceed 5A and voltage specifications are not critical.
Q: What packaging options are available for substitute parts?
A: Substitute parts are available in multiple packaging formats: Bulk (L77DD50S, DDM50S), Bag (L177DD50S, L177DFD50S, L77DDF50S, L77DFD50S, L77DFDF50S), and Tray (L177SDD50SVF, L177SDD50SVFM, L177SDDG50S). Select packaging based on inventory management and assembly requirements.
Q: Are all substitute parts RoHS compliant?
A: Most substitute parts are RoHS compliant (L77DD50S, L77DDF50S, L177DD50S, L177SDD50SVF, L177SDD50SVFM, L177SDDG50S). DDM50S and the original DDM50SN are RoHS non-compliant. For applications requiring RoHS compliance, select from the compliant substitute parts.
Q: What is the difference between brass and phosphor bronze contacts?
A: The DDM50SN uses brass contacts. Substitute parts L77DD50S and L177DD50S maintain brass contacts. Parts L177SDD50SVF, L177SDD50SVFM, and L177SDDG50S use phosphor bronze contacts, which have different electrical and mechanical properties. Brass contacts are specified in the DDM50SN; phosphor bronze substitutes should be evaluated for application compatibility.
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