L777TSEG09POL2 D-Sub Connector Equivalent & Substitute Parts

Part Overview

The L777TSEG09POL2 is a 9-position D-Sub plug connector manufactured by Amphenol ICC (Commercial Products) with male pins, vertical solder termination, and through-hole mounting. This connector is classified as active product status and is RoHS compliant. The connector features a DE/E shell size (Size 1), tin-plated steel shell with gold-plated contacts, and operates across an industrial temperature range of -55°C to 125°C with a 5A current rating per contact.

Substitute parts are necessary when the original manufacturer part becomes unavailable, when alternative sourcing reduces lead times, or when design flexibility permits selection from multiple qualified suppliers while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	L777TSEG09POL2 Specification
Connector Type	Plug, Male Pins
Number of Positions	9
Number of Rows	2
Shell Size, Connector Layout	1 (DE, E)
Mounting Type	Through Hole
Termination	Solder
Current Rating	5A
Voltage Rating	600V
Operating Temperature	-55°C ~ 125°C
Shell Material, Finish	Steel, Tin Plated
Contact Finish	Gold
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the L777TSEG09POL2 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Connector Type: Plug, Male Pins
Number of Positions: 9
Number of Rows: 2
Shell Size, Connector Layout: 1 (DE, E)
Connector Style: D-Sub
Contact Type: Signal
Material Flammability Rating: UL94 V-0

Compatible Variation Parameters:

Mounting Type: Through Hole (primary); Panel Mount with Through Hole acceptable with design review
Termination: Solder (primary); Press-Fit acceptable with design review
Current Rating: 5A minimum required; higher ratings acceptable
Operating Temperature: Must encompass -55°C minimum and 125°C maximum or higher
Shell Material Finish: Steel with various plating options (Tin, Nickel, Tin-Nickel)
Contact Finish: Gold acceptable; Flash thickness acceptable
Flange Feature: Variations acceptable (Board Side, Mating Side, Housing/Shell, with or without locking mechanisms)

Compliance Parameters:

RoHS Status: RoHS Compliant or ROHS3 Compliant required
Moisture Sensitivity Level: 1 (Unlimited) acceptable

Substitute parts meeting these criteria maintain electrical and mechanical compatibility with the original L777TSEG09POL2 in standard D-Sub connector applications.

Parameter Comparison

Part Number	Manufacturer	Connector Type	Positions	Rows	Shell Size	Mounting Type	Termination	Current Rating (A)	Operating Temp (°C)	Shell Material, Finish	Contact Finish	UL94 Rating	RoHS Status	Product Status
L777TSEG09POL2	Amphenol ICC	Plug, Male Pins	9	2	1 (DE, E)	Through Hole	Solder	5	-55 ~ 125	Steel, Tin Plated	Gold	V-0	RoHS Compliant	Active
09651616713	HARTING	Plug, Male Pins	9	2	1 (DE, E)	Through Hole	Solder	6.5	-55 ~ 125	Steel	Not Specified	V-0	ROHS3 Compliant	Active
172-E09-113R001	NorComp Inc.	Plug, Male Pins	9	2	1 (DE, E)	Panel Mount, Through Hole	Solder	5	-50 ~ 100	Steel, Nickel Plated	Gold	V-0	ROHS3 Compliant	Active
172-E09-113R011	NorComp Inc.	Plug, Male Pins	9	2	1 (DE, E)	Panel Mount, Through Hole	Solder	5	-50 ~ 100	Steel, Nickel Plated	Gold	V-0	ROHS3 Compliant	Active
172-E09-113R021	NorComp Inc.	Plug, Male Pins	9	2	1 (DE, E)	Panel Mount, Through Hole	Solder	5	-50 ~ 100	Steel, Nickel Plated	Gold	V-0	ROHS3 Compliant	Active
172-E09-113R031	NorComp Inc.	Plug, Male Pins	9	2	1 (DE, E)	Panel Mount, Through Hole	Solder	5	-50 ~ 100	Steel, Nickel Plated	Gold	V-0	ROHS3 Compliant	Active
172-E09-113R911	NorComp Inc.	Plug, Male Pins	9	2	1 (DE, E)	Panel Mount, Through Hole	Solder	5	-50 ~ 100	Steel, Nickel Plated	Gold	V-0	ROHS3 Compliant	Active
5-338309-2	TE Connectivity AMP	Plug, Male Pins	9	2	1 (DE, E)	Through Hole	Solder	6	-55 ~ 105	Steel, Tin Plated	Gold	V-0	RoHS Compliant	Obsolete
5786830-1	TE Connectivity AMP	Plug, Male Pins	9	2	1 (DE, E)	Through Hole	Press-Fit	Not Specified	-55 ~ 105	Steel, Tin Plated	Gold	V-0	RoHS Compliant	Active
6-338309-2	TE Connectivity AMP	Plug, Male Pins	9	2	1 (DE, E)	Through Hole	Solder	6	-55 ~ 105	Steel, Tin Plated	Gold	V-0	RoHS Compliant	Active
D09P24A4GX00LF	Amphenol ICC (FCI)	Plug, Male Pins	9	2	1 (DE, E)	Through Hole	Solder	5	-55 ~ 125	Steel, Tin-Nickel Plated	Gold	V-0	RoHS Compliant	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The following parts are recommended as primary substitutes based on active product status, full compliance certifications, and matching electrical specifications:

09651616713 (HARTING): Active status, ROHS3 compliant, 6.5A current rating (exceeds 5A requirement), operating temperature -55°C to 125°C matches original specification. Through-hole solder termination with DE/E shell size provides direct mechanical compatibility.
D09P24A4GX00LF (Amphenol ICC FCI): Active status, RoHS compliant, 5A current rating, operating temperature -55°C to 125°C matches original specification. Through-hole solder termination with DE/E shell size and Tin-Nickel plated steel shell provides equivalent performance.
6-338309-2 (TE Connectivity AMP): Active status, RoHS compliant, 6A current rating, through-hole solder termination. Operating temperature range -55°C to 105°C is narrower than original but covers standard industrial applications. Tin-plated steel shell with gold contacts provides equivalent electrical performance.

Secondary Substitutes (Design Review Required):

The following parts require design review due to operating temperature limitations or termination method differences:

172-E09-113R001, 172-E09-113R011, 172-E09-113R021, 172-E09-113R031, 172-E09-113R911 (NorComp Inc.): All active status, ROHS3 compliant, 5A current rating, solder termination. Operating temperature range -50°C to 100°C is narrower than original specification. Panel mount capability with through-hole option provides mechanical flexibility. Nickel-plated steel shell with gold contacts. Suitable for applications not requiring full -55°C to 125°C range.
5786830-1 (TE Connectivity AMP): Active status, RoHS compliant, press-fit termination differs from solder requirement. Operating temperature -55°C to 105°C. Suitable only for designs permitting press-fit assembly method.

Not Recommended:

5-338309-2 (TE Connectivity AMP): Obsolete product status. While electrically compatible, obsolete classification indicates discontinued manufacturing and potential supply chain limitations.

Frequently Asked Questions (FAQ)

Q: Can I substitute the L777TSEG09POL2 with any 9-position D-Sub connector?

A: No. Substitution requires matching the critical parameters: 9-position plug with male pins, DE/E shell size (Size 1), 2-row configuration, through-hole mounting, solder termination, UL94 V-0 flammability rating, and RoHS compliance. Additional parameters such as current rating, operating temperature range, and shell material finish must meet or exceed the original specification.

Q: What is the difference between the NorComp 172-E09 series parts and the original L777TSEG09POL2?

A: The NorComp 172-E09 series offers panel mount capability in addition to through-hole mounting, providing design flexibility. However, the operating temperature range is limited to -50°C to 100°C compared to the original -55°C to 125°C. The NorComp parts use nickel-plated steel shells and machined contacts (brass) versus the original tin-plated steel shell with stamped copper alloy contacts. These differences are acceptable for applications operating within the narrower temperature range.

Q: Why does the HARTING 09651616713 have a higher current rating (6.5A) than the original part (5A)?

A: The HARTING part is rated for 6.5A per contact, which exceeds the original 5A specification. This higher rating indicates improved contact design or material properties. The part remains compatible because it meets or exceeds the original electrical requirements. Applications requiring only 5A operation will function correctly with this substitute.

Q: Can I use the TE Connectivity 5786830-1 (press-fit termination) instead of the solder-terminated original?

A: The 5786830-1 uses press-fit termination instead of solder termination. This substitution is only acceptable if your assembly process and PCB design accommodate press-fit contacts. The connector is electrically and mechanically compatible in terms of shell size, pin count, and layout, but the termination method must be compatible with your manufacturing capability.

Q: What does RoHS Compliant versus ROHS3 Compliant mean for substitution?

A: Both RoHS Compliant and ROHS3 Compliant indicate compliance with hazardous substance restrictions. RoHS Compliant refers to the original Restriction of Hazardous Substances Directive, while ROHS3 Compliant refers to the updated directive (2011/65/EU). Both are acceptable for substitution purposes. ROHS3 represents a more recent compliance standard and is generally preferred for new designs.

Q: Are there any inventory considerations when selecting a substitute?

A: Yes. Inventory levels vary significantly among substitute options. The NorComp 172-E09-113R911 has 1,938 pieces in stock, while the original L777TSEG09POL2 has 735 pieces. Higher inventory levels may reduce lead times and support production schedules. Verify current inventory status with your supplier before finalizing part selection.

Q: What is the significance of the flange feature differences (Board Side, Mating Side, Housing/Shell)?

A: The flange feature determines the mounting interface and locking mechanism. Board Side flanges mount to the PCB with threaded holes (typically 4-40). Mating Side flanges provide locking on the mating connector side. Housing/Shell flanges mount to the connector shell itself. These variations affect mechanical assembly but do not impact electrical compatibility. Select based on your mechanical mounting requirements.

Q: Can I use the TE Connectivity 5-338309-2 despite its obsolete status?

A: The 5-338309-2 is electrically and mechanically compatible with the original part. However, obsolete status indicates discontinued manufacturing. While current inventory (667 pieces) is available, future availability is not guaranteed. Use this part only if immediate availability is critical and long-term supply is not required. For new designs or long-term production, select from active status alternatives.

Q: What is the difference between stamped and machined contacts?

A: Stamped contacts (original L777TSEG09POL2) are formed from sheet metal and are cost-effective for high-volume applications. Machined contacts (NorComp 172-E09 series) are individually machined and typically offer tighter tolerances and improved contact reliability. Both are acceptable for standard D-Sub applications. Machined contacts may be preferred for high-reliability applications.

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