DEMF09PN D-Sub 9 Position Plug Connector Equivalent & Substitute Parts

Part Overview

The DEMF09PN is a 9 position D-Sub plug connector manufactured by Amphenol ICC (FCI) with male pins and solder cup termination. This connector is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. The part operates within a temperature range of -55°C to 155°C and carries a current rating of 7.5A per contact at 300V, with UL94 V-0 flammability rating and RoHS non-compliant status.

Key Parameters

Parameter	DEMF09PN Specification
Connector Type	D-Sub Plug, Male Pins
Number of Positions	9
Shell Size	1 (DE, E)
Mounting Type	Free Hanging (In-Line)
Termination	Solder Cup
Current Rating	7.5A per Contact
Voltage Rating	300V
Operating Temperature	-55°C ~ 155°C
Shell Material/Finish	Steel, Yellow Cadmium Plated
Contact Finish	Gold
Flammability Rating	UL94 V-0
RoHS Status	Non-compliant

Substitute Part Grouping Explanation

Substitution of the DEMF09PN is determined by the following critical parameters: connector type (D-Sub plug with male pins), number of positions (9), shell size (1/DE/E), termination method (solder cup), and electrical ratings (current and voltage). Mounting type represents a key differentiator among available substitutes.

The substitute parts are grouped into two categories based on mounting configuration:

Free Hanging (In-Line) Mounting: DEMF09P and 5-747904-2 maintain the same mounting style as the original part.

Panel Mount Configuration: 171-009-102L001, 171-009-103L001, 171-009-103L011, and 171-009-103L021 provide panel mount alternatives with different flange features and shell finishes.

Electrical compatibility is constrained by current rating, voltage rating, and operating temperature range. Mechanical compatibility depends on shell material finish, contact finish specifications, and dielectric material properties.

Parameter Comparison

Parameter	DEMF09PN	DEMF09P	171-009-102L001	171-009-103L001	171-009-103L011	171-009-103L021	5-747904-2	5-747904-5
Manufacturer	Amphenol ICC (FCI)	Amphenol ICC (FCI)	NorComp Inc.	NorComp Inc.	NorComp Inc.	NorComp Inc.	TE Connectivity	TE Connectivity
Connector Type	Plug, Male Pins	Plug, Male Pins	Plug, Male Pins	Plug, Male Pins	Plug, Male Pins	Plug, Male Pins	Plug, Male Pins	Plug, Male Pins
Number of Positions	9	9	9	9	9	9	9	9
Shell Size	1 (DE, E)	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)	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Free Hanging (In-Line)	Panel Mount
Termination	Solder Cup	Solder Cup	Solder Cup	Solder Cup	Solder Cup	Solder Cup	Solder Cup	Solder Cup
Current Rating (Amps)	7.5A per Contact	7.5A per Contact	5A	5A	5A	5A	3A	3A
Voltage Rating	300V	300V	Not Specified	Not Specified	Not Specified	Not Specified	250V	250V
Operating Temperature	-55°C ~ 155°C	-55°C ~ 125°C	-50°C ~ 100°C	-50°C ~ 100°C	-50°C ~ 100°C	-50°C ~ 100°C	-55°C ~ 105°C	-55°C ~ 105°C
Shell Material/Finish	Steel, Yellow Cadmium Plated	Steel, Yellow Cadmium Plated	Steel, Tin Plated	Steel, Nickel Plated	Steel, Nickel Plated	Steel, Nickel Plated	Steel, Tin Plated	Steel, Tin Plated
Contact Finish	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold
Contact Material	Brass	Brass	Copper Alloy	Copper Alloy	Copper Alloy	Copper Alloy	Brass	Brass
Dielectric Material	Thermoplastic	Thermoplastic	PBT, Glass Filled	PBT, Glass Filled	PBT, Glass Filled	PBT, Glass Filled	PBT, Glass Filled	PBT, Glass Filled
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
Product Status	Obsolete	Active	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Free Hanging (In-Line) Mounting:

DEMF09P is the direct active equivalent from Amphenol ICC (FCI). It maintains identical connector geometry, termination method, and electrical ratings (7.5A per contact, 300V). The primary difference is operating temperature range (-55°C to 125°C versus -55°C to 155°C). This part is active and suitable for direct replacement in applications not requiring the extended upper temperature limit of the original.

Alternative - Free Hanging (In-Line) Mounting:

5-747904-2 from TE Connectivity provides a free hanging configuration with reduced current rating (3A versus 7.5A) and lower voltage rating (250V versus 300V). This part is ROHS3 compliant and active. Selection requires verification that application current and voltage requirements do not exceed these reduced ratings.

Panel Mount Alternatives:

For applications requiring panel mount configuration, 171-009-103L001 and 171-009-103L021 from NorComp Inc. are active ROHS3 compliant options. Both feature nickel-plated steel shells and reduced current rating (5A). The 171-009-103L021 provides cable-side flange mounting (4-40), while 171-009-103L001 provides housing/shell unthreaded flange. Operating temperature is limited to -50°C to 100°C.

171-009-103L011 offers identical electrical and mechanical specifications to 171-009-103L001 with cable-side flange mounting (4-40).

171-009-102L001 is an obsolete NorComp option with tin-plated shell and stamped contact form, suitable only for legacy system maintenance.

Compliance Consideration:

All substitute parts except DEMF09P are ROHS3 compliant. Applications subject to RoHS requirements must select from the compliant alternatives, accepting reduced current ratings and operating temperature ranges as necessary.

Frequently Asked Questions (FAQ)

Q: Can DEMF09P directly replace DEMF09PN in all applications?

A: DEMF09P is mechanically and electrically compatible for most applications. The operating temperature range differs: DEMF09P operates to 125°C maximum versus 155°C for DEMF09PN. Applications requiring sustained operation above 125°C require alternative evaluation.

Q: What is the impact of reduced current rating in substitute parts?

A: NorComp and TE Connectivity substitutes carry 5A and 3A current ratings respectively, compared to 7.5A for DEMF09PN. Circuit designs must verify that per-contact current does not exceed the substitute part rating. Exceeding rated current causes contact heating and potential failure.

Q: Are panel mount substitutes compatible with free hanging applications?

A: No. Panel mount connectors (171-009 series and 5-747904-5) feature flanges for panel installation and are not suitable for free hanging in-line applications. Mounting type must match application requirements.

Q: What is the significance of shell material finish differences?

A: DEMF09PN uses yellow cadmium plating; substitutes use tin or nickel plating. These finishes provide corrosion resistance in different environmental conditions. Cadmium plating is restricted under RoHS3, necessitating alternative finishes in compliant designs. Environmental exposure conditions determine optimal finish selection.

Q: Do all substitute parts meet UL94 V-0 flammability requirements?

A: Yes. All listed substitute parts carry UL94 V-0 flammability rating, matching the original DEMF09PN specification.

Q: What is the difference between 171-009-103L001 and 171-009-103L011?

A: Both parts are electrically and mechanically identical NorComp panel mount connectors with nickel-plated shells and 5A current rating. The difference is flange feature: 171-009-103L001 has housing/shell unthreaded flange, while 171-009-103L011 has cable-side 4-40 flange. Selection depends on mounting interface requirements.

Q: Are RoHS3 compliant substitutes suitable for legacy systems?

A: RoHS3 compliant parts are suitable for legacy systems unless the original design specifically requires cadmium plating or other restricted substances. Compliance status does not affect electrical or mechanical performance in most applications.

Q: What inventory considerations apply to substitute selection?

A: 171-009-103L021 has the highest inventory (3571 pcs), followed by 171-009-102L001 (1301 pcs) and 5-747904-2 (1000100 pcs). DEMF09P has 731 pcs available. Availability may influence selection for high-volume requirements.

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