DEM09P043N D-Sub 9-Position Plug Connector Equivalent & Substitute Parts

Part Overview

The DEM09P043N is a 9-position D-Sub plug connector manufactured by Amphenol ICC (FCI) in the DM HE508 series. This free-hanging, in-line solder cup connector features male pins with a DE/E shell size and is rated for 7.5A per contact at 300V. The part is currently active in production with 983 units in stock.

Substitute parts are necessary when the original DEM09P043N becomes unavailable, when design requirements shift toward panel-mount configurations, or when compliance certifications (such as RoHS3) are mandated for new applications. The substitute parts listed maintain core electrical and mechanical compatibility while offering alternative mounting styles, shell finishes, and compliance profiles.

Key Parameters

Parameter	DEM09P043N
Connector Type	D-Sub Plug, Male Pins
Number of Positions	9
Shell Size / Layout	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 to 155°C
Shell Material / Finish	Steel, Yellow Cadmium Plated
Contact Finish	Gold
Flammability Rating	UL94 V-0
RoHS Status	RoHS Non-Compliant

Substitute Part Grouping Explanation

Substitution logic for the DEM09P043N is based on the following allowed parameters:

Core Compatibility Requirements:

Connector type: D-Sub plug with male pins
Number of positions: 9
Shell size and layout: DE/E (1)
Termination method: Solder cup
Flange feature: Housing/shell configuration
Dielectric material: Thermoplastic or equivalent
Contact material: Brass or copper alloy
Flammability rating: UL94 V-0

Substitution Categories:

Category A – Free-Hanging (In-Line) Equivalents: Parts 5-747904-2, L717SDE09PC309, L717SDEH09P, and L717SDEH09PC309 maintain the free-hanging mounting style of the original DEM09P043N. These parts differ in current rating (3A vs. 7.5A), voltage rating (250V vs. 300V), and shell finish, but preserve the in-line solder cup configuration.

Category B – Panel-Mount Alternatives: Parts 171-009-102L001, 171-009-103L001, 171-009-103L011, and 171-009-103L021 offer panel-mount configurations with flange features. These parts are suitable when the application design requires panel-mounted connectors instead of free-hanging connectors. Current rating is reduced to 5A, and operating temperature range is narrower (-50°C to 100°C).

Category C – Compliance-Driven Substitutes: Parts from NorComp (171 series) and TE Connectivity (5-747904 series) provide RoHS3 compliance, addressing regulatory requirements absent in the original RoHS non-compliant DEM09P043N.

Parameter Comparison

Parameter	DEM09P043N	171-009-102L001	171-009-103L001	171-009-103L011	171-009-103L021	5-747904-2	5-747904-5	L717SDE09PC309	L717SDE09PVFC309	L717SDEH09P	L717SDEH09PC309
Connector Type	Plug, Male	Plug, Male	Plug, Male	Plug, Male	Plug, Male	Plug, Male	Plug, Male	Plug, Male	Plug, Male	Plug, Male	Plug, Male
Positions	9	9	9	9	9	9	9	9	9	9	9
Shell Size	DE/E (1)	DE/E (1)	DE/E (1)	DE/E (1)	DE/E (1)	DE/E (1)	DE/E (1)	DE/E (1)	DE/E (1)	DE/E (1)	DE/E (1)
Mounting Type	Free Hanging	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Free Hanging	Panel Mount	Free Hanging	Free Hanging	Free Hanging	Free Hanging
Termination	Solder Cup	Solder Cup	Solder Cup	Solder Cup	Solder Cup	Solder Cup	Solder Cup	Solder Cup	Solder Cup	Solder Cup	Solder Cup
Current Rating (A)	7.5	5	5	5	5	3	3	3	3	3	3
Voltage Rating (V)	300	—	—	—	—	250	250	250	250	250	250
Operating Temperature	-55°C to 155°C	-50°C to 100°C	-50°C to 100°C	-50°C to 100°C	-50°C to 100°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C
Shell Material / Finish	Steel, Yellow Cadmium	Steel, Tin Plated	Steel, Nickel Plated	Steel, Nickel Plated	Steel, Nickel Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated
Contact Finish	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold
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	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	Non-Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant
Product Status	Active	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For Free-Hanging (In-Line) Applications:

When the original DEM09P043N mounting configuration must be preserved, select from the following active substitutes:

5-747904-2 (TE Connectivity AMPLIMITE HD-20): Active status, RoHS3 compliant, 3A current rating, 250V voltage rating, -55°C to 105°C operating range. Suitable for applications where current demand does not exceed 3A and voltage does not exceed 250V.
L717SDE09PC309, L717SDEH09P, L717SDEH09PC309 (Amphenol ICC SD series): All active status, RoHS compliant, 3A current rating, 250V voltage rating, -55°C to 105°C operating range. These parts differ in flange configuration (housing/shell vs. cable side) and contact finish thickness. Select based on specific mechanical mounting requirements.

For Panel-Mount Applications:

When design requirements shift to panel-mounted connectors:

171-009-103L001 (NorComp 171 series): Active status, ROHS3 compliant, 5A current rating, -50°C to 100°C operating range, nickel-plated steel shell. Recommended for new designs requiring RoHS3 compliance.
171-009-103L011, 171-009-103L021 (NorComp 171 series): Active status, ROHS3 compliant, cable-side flange feature (4-40), 5A current rating. Select when cable-side mounting is required.
171-009-102L001 (NorComp 171 series): Obsolete status. Avoid for new designs; use only when legacy system compatibility is mandatory.

Compliance Considerations:

All substitute parts listed are either RoHS compliant or ROHS3 compliant, addressing the non-compliant status of the original DEM09P043N. For applications subject to RoHS3 regulations, select from NorComp 171 series or TE Connectivity 5-747904 series parts.

Current and Voltage Derating:

Substitute parts in this list feature reduced current ratings (3A to 5A) compared to the original 7.5A rating and reduced voltage ratings (250V) compared to the original 300V rating. Applications requiring the full 7.5A or 300V specifications cannot use these substitutes without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can I use a panel-mount substitute (171 series) in place of the free-hanging DEM09P043N?

A: No. Panel-mount and free-hanging connectors have different mechanical mounting interfaces. The 171 series parts feature panel-mount flanges and cannot be directly substituted into applications designed for free-hanging in-line connectors. Mechanical redesign of the mounting structure is required.

Q: What is the difference between the NorComp 171-009-103L001, 171-009-103L011, and 171-009-103L021 parts?

A: All three parts are identical in electrical specifications (5A, -50°C to 100°C, nickel-plated steel shell, gold contact finish). The difference lies in the flange feature: 171-009-103L001 has an unthreaded housing/shell flange, while 171-009-103L011 and 171-009-103L021 have cable-side flanges with 4-40 threading. Select based on your mechanical mounting interface.

Q: Why do the substitute parts have lower current ratings (3A to 5A) than the original DEM09P043N (7.5A)?

A: Current rating is determined by contact geometry, material composition, and thermal design. The substitute parts listed use stamped contacts (vs. machined contacts in the original) and different dielectric materials, resulting in lower current-carrying capacity. Applications requiring 7.5A per contact cannot use these substitutes.

Q: Is the DEM09P043N RoHS compliant?

A: No. The DEM09P043N is RoHS non-compliant due to its yellow cadmium plating. All substitute parts listed are either RoHS compliant or ROHS3 compliant. If your application is subject to RoHS regulations, you must transition to a compliant substitute.

Q: Can I use the TE Connectivity 5-747904-5 (panel-mount) as a substitute for the free-hanging DEM09P043N?

A: No. The 5-747904-5 is a panel-mount connector and cannot be directly substituted for a free-hanging connector. However, the 5-747904-2 (free-hanging variant in the same AMPLIMITE HD-20 series) is a valid substitute if current and voltage requirements are met.

Q: What is the difference between contact finish "Flash" and "30.0µin (0.76µm)"?

A: Both are gold plating specifications. "Flash" indicates a very thin gold layer applied for corrosion protection. "30.0µin (0.76µm)" specifies a thicker gold plating of 30 microinches. Thicker plating provides enhanced durability in high-cycle mating applications. For most applications, both are functionally equivalent.

Q: Are the Amphenol ICC SD series parts (L717SDE09PC309, etc.) direct replacements for the DEM09P043N?

A: Mechanically and electrically, yes, for free-hanging applications. Both are solder cup connectors with 9 positions, DE/E shell size, and gold-plated contacts. However, the SD series parts have lower current ratings (3A vs. 7.5A) and lower voltage ratings (250V vs. 300V). Verify that your application does not exceed these reduced specifications.

Q: What is the inventory status of these substitute parts?

A: All substitute parts listed are in stock with quantities ranging from 1,000 to 1,000,100 units. The highest inventory is 5-747904-2 (TE Connectivity) with 1,000,100 units available. NorComp 171-009-103L021 has 3,571 units in stock.

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