DDMF50SN 50 Position D-Sub Receptacle Equivalent & Substitute Parts

Part Overview

The DDMF50SN 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 support and new designs requiring compatible alternatives.

The DDMF50SN features a 3-row configuration in shell size 5 (DD, D) with gold-plated contacts rated for 7.5A per contact at 300V. The connector uses yellow cadmium-plated steel housing and thermoplastic dielectric material with UL94 V-0 flammability rating.

Key Parameters

Parameter	DDMF50SN 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
Current Rating (Amps)	7.5A per Contact
Voltage Rating	300V
Operating Temperature	-55°C ~ 155°C
Shell Material, Finish	Steel, Yellow Cadmium Plated
Contact Finish	Gold
Material Flammability Rating	UL94 V-0
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the DDMF50SN is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Connector type: Receptacle, Female Sockets
Number of positions: 50
Number of rows: 3
Shell size: 5 (DD, D)
Termination method: Solder Cup
Flammability rating: UL94 V-0

Allowable Variation Parameters:

Mounting type: Free Hanging (In-Line) or Panel Mount
Current rating: Equal to or greater than 5A
Voltage rating: Equal to or greater than 250V
Operating temperature range: Must encompass application requirements
Shell finish: Steel with various plating options (Yellow Cadmium, Tin, Nickel)
Contact material: Brass or Phosphor Bronze
Dielectric material: Thermoplastic or Glass-Filled variants

Substitute parts are grouped into two categories:

Category 1: Free Hanging (In-Line) Mounting

DDMF50S (Amphenol ICC FCI, Active)
L177SDD50SVF (Amphenol ICC Commercial, Active)
L177SDD50SVFM (Amphenol ICC Commercial, Active)
L177SDDG50S (Amphenol ICC Commercial, Active)

Category 2: Panel Mount Configuration

171-050-202L001 (NorComp Inc., Obsolete)
171-050-202L021 (NorComp Inc., Obsolete)
171-050-203L001 (NorComp Inc., Active)
171-050-203L011 (NorComp Inc., Active)
171-050-203L021 (NorComp Inc., Active)
171-050-203L031 (NorComp Inc., Active)

Parameter Comparison

Part Number	Manufacturer	Mounting Type	Current Rating (A)	Voltage Rating (V)	Operating Temp (°C)	Shell Finish	Contact Material	Product Status	RoHS Status
DDMF50SN	Amphenol ICC (FCI)	Free Hanging (In-Line)	7.5	300	-55 ~ 155	Steel, Yellow Cadmium Plated	Brass	Obsolete	Non-compliant
DDMF50S	Amphenol ICC (FCI)	Free Hanging (In-Line)	7.5	300	-55 ~ 125	Steel, Yellow Cadmium Plated	Phosphor Bronze	Active	Non-compliant
171-050-202L001	NorComp Inc.	Panel Mount	5	—	-50 ~ 100	Steel, Tin Plated	—	Obsolete	ROHS3 Compliant
171-050-202L021	NorComp Inc.	Panel Mount	5	—	-50 ~ 100	Steel, Tin Plated	—	Obsolete	ROHS3 Compliant
171-050-203L001	NorComp Inc.	Panel Mount	5	—	-50 ~ 100	Steel, Nickel Plated	—	Active	ROHS3 Compliant
171-050-203L011	NorComp Inc.	Panel Mount	5	—	-50 ~ 100	Steel, Nickel Plated	—	Active	ROHS3 Compliant
171-050-203L021	NorComp Inc.	Panel Mount	5	—	-50 ~ 100	Steel, Nickel Plated	—	Active	ROHS3 Compliant
171-050-203L031	NorComp Inc.	Panel Mount	5	—	-50 ~ 100	Steel, Nickel Plated	—	Active	ROHS3 Compliant
L177SDD50SVF	Amphenol ICC (Commercial)	Free Hanging (In-Line)	3	250	-55 ~ 125	Steel, Tin Plated	Phosphor Bronze	Active	Compliant
L177SDD50SVFM	Amphenol ICC (Commercial)	Free Hanging (In-Line)	3	250	-55 ~ 125	Steel, Tin Plated	Phosphor Bronze	Active	Compliant
L177SDDG50S	Amphenol ICC (Commercial)	Free Hanging (In-Line)	3	250	-55 ~ 125	Steel, Tin Plated	Phosphor Bronze	Active	Compliant

Engineering Selection Recommendations

For Free Hanging (In-Line) Applications:

DDMF50S is the primary substitute for DDMF50SN. Both parts share identical mounting configuration, position count, and shell size. DDMF50S is active in production with equivalent electrical ratings (7.5A, 300V). The contact material differs (Phosphor Bronze vs. Brass), but both materials meet the connector's functional requirements. Operating temperature range is reduced to -55°C ~ 125°C; applications requiring operation above 125°C must evaluate thermal requirements.

L177SDD50SVF, L177SDD50SVFM, and L177SDDG50S are active alternatives from Amphenol ICC Commercial Products. These parts maintain the 50-position, 3-row configuration with solder cup termination. Current rating is reduced to 3A per contact, and voltage rating is 250V. These parts are RoHS compliant. Selection of these alternatives is appropriate only when current and voltage requirements do not exceed 3A and 250V respectively. Flange feature variations (Mating Side Female Screwlock 4-40, Mating Side Female Screwlock M3, Cable Side M3) accommodate different mechanical mounting requirements.

For Panel Mount Applications:

NorComp Inc. 171-050 series parts provide panel mount alternatives. The 171-050-203L series (Active status) is preferred over 171-050-202L series (Obsolete status). Within the 171-050-203L series, selection depends on flange feature requirements:

171-050-203L001: Housing/Shell (Unthreaded)
171-050-203L011: Cable Side (4-40)
171-050-203L021: Cable Side (4-40)
171-050-203L031: Mating Side (4-40)

All NorComp parts are ROHS3 compliant. Current rating is 5A per contact. Operating temperature range is -50°C ~ 100°C; applications requiring operation below -50°C or above 100°C must evaluate thermal requirements.

Compliance Considerations:

DDMF50SN and DDMF50S are RoHS non-compliant. Applications subject to RoHS requirements must select from L177SDD50SVF, L177SDD50SVFM, L177SDDG50S (RoHS Compliant) or NorComp 171-050-203L series (ROHS3 Compliant).

Frequently Asked Questions (FAQ)

Q: Can DDMF50S directly replace DDMF50SN in existing designs?

A: DDMF50S is mechanically and electrically compatible with DDMF50SN for free hanging (in-line) mounting applications. Both connectors share identical position count (50), row configuration (3), shell size (5 DD/D), and termination method (solder cup). Electrical ratings are equivalent (7.5A, 300V). The primary difference is contact material (Phosphor Bronze vs. Brass) and reduced maximum operating temperature (125°C vs. 155°C). Designs operating above 125°C require thermal evaluation.

Q: What is the difference between free hanging and panel mount configurations?

A: Free hanging (in-line) connectors mount directly to cable assemblies or circuit boards without a panel interface. Panel mount connectors attach to an enclosure or panel with a flange. DDMF50SN is free hanging; NorComp 171-050 series parts are panel mount. Mounting type selection depends on system mechanical design requirements.

Q: Are NorComp 171-050 parts suitable replacements for DDMF50SN?

A: NorComp 171-050 parts are mechanically compatible (50 positions, 3 rows, shell size 5 DD/D, solder cup termination) but differ in mounting type (panel mount vs. free hanging). These parts are appropriate only when panel mount configuration is acceptable. Current rating is reduced to 5A per contact. Operating temperature range is -50°C ~ 100°C. NorComp parts offer RoHS compliance advantage.

Q: What does the flange feature designation mean in NorComp part numbers?

A: Flange feature indicates the mechanical attachment point. Housing/Shell (Unthreaded) provides a basic unthreaded flange. Cable Side (4-40) and Mating Side (4-40) indicate threaded attachment points using 4-40 fasteners on the cable side or mating side respectively. Selection depends on the mechanical interface design of the application.

Q: Why do L177SDD50SVF, L177SDD50SVFM, and L177SDDG50S have lower current ratings than DDMF50SN?

A: These Amphenol ICC Commercial Products are rated for 3A per contact compared to DDMF50SN's 7.5A per contact. Current rating is determined by contact geometry and material properties. Applications requiring current above 3A per contact must select DDMF50S or remain with DDMF50SN. The 3A rating is sufficient for signal-level applications with lower power requirements.

Q: What is the significance of RoHS compliance in substitute part selection?

A: RoHS (Restriction of Hazardous Substances) compliance is a regulatory requirement in many markets. DDMF50SN and DDMF50S are RoHS non-compliant. L177SDD50SVF, L177SDD50SVFM, and L177SDDG50S are RoHS compliant. NorComp 171-050-203L series parts are ROHS3 compliant. Applications subject to RoHS regulations must select from compliant alternatives.

Q: Can contact material (Brass vs. Phosphor Bronze) affect connector performance?

A: Both Brass and Phosphor Bronze are acceptable contact materials for D-Sub connectors. Contact material affects mechanical properties and corrosion resistance but does not alter electrical performance for signal-level applications. Material selection is based on environmental exposure and mechanical durability requirements. Both materials are suitable for standard industrial applications.

Q: What packaging format is available for these substitute parts?

A: DDMF50SN is supplied in bulk packaging. DDMF50S and all NorComp 171-050 series parts are supplied in Tray packaging. L177SDD50SVF, L177SDD50SVFM, and L177SDDG50S are supplied in Tray packaging. Tray packaging is standard for production quantities and provides organized component handling.

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