L77DEH09ST 9 Position D-Sub Receptacle Connector

Part Overview

The L77DEH09ST is a 9 Position D-Sub Receptacle connector manufactured by Amphenol ICC (Commercial Products). This through-hole solder-terminated connector features female sockets in a 1 (DE, E) shell size layout. The part is actively manufactured and RoHS compliant, with current availability of 917 pieces in stock.

Finding alternative models is necessary due to supply constraints, manufacturing discontinuation of related products in the D-Sub connector family, or specific application requirements that may benefit from alternative flange configurations, material compositions, or electrical ratings while maintaining core D-Sub 9-position receptacle functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	L77DEH09ST
Manufacturer	Amphenol ICC (Commercial Products)
Connector Type	Receptacle, Female Sockets
Number of Positions	9
Shell Size, Connector Layout	1 (DE, E)
Mounting Type	Through Hole
Termination	Solder
Shell Material, Finish	Steel, Tin Plated
Contact Finish	Gold
Current Rating (Amps)	7.5A
Voltage Rating	300V
Operating Temperature	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitute parts for the L77DEH09ST are grouped based on the following core parameters that determine functional compatibility:

Critical Parameters (Must Match):

Connector Type: Receptacle, Female Sockets
Number of Positions: 9
Shell Size, Connector Layout: 1 (DE, E)
Mounting Type: Through Hole
Termination: Solder
Material Flammability Rating: UL94 V-0

Allowable Variations:

Flange Feature: Board Side (4-40), Housing/Shell (Unthreaded), or Mating Side Female Screwlock (4-40)
Shell Material/Finish: Steel (Tin Plated, Nickel Plated, or unfinished)
Contact Finish: Gold or unspecified
Current Rating: 5A to 7.5A (lower ratings acceptable for lower-demand applications)
Voltage Rating: 100V or higher (lower voltage acceptable)
Dielectric Material: Thermoplastic Glass Filled, Polycyclohexylenedimethylene Terephthalate (PCT), Polybutylene Terephthalate (PBT), or Polyamide (PA6T)
Contact Material: Brass, Copper Alloy, or Phosphor Bronze
Operating Temperature: Minimum -55°C to -20°C; Maximum 100°C to 125°C

Substitutes are sourced from HARTING, NorComp Inc., and TE Connectivity AMP Connectors, all of which provide equivalent D-Sub 9-position receptacle solutions with active or acceptable product status.

Parameter Comparison

Part Number	Manufacturer	Flange Feature	Shell Material, Finish	Contact Finish	Current Rating (Amps)	Voltage Rating	Operating Temperature	Product Status	RoHS Status
L77DEH09ST	Amphenol ICC (Commercial Products)	Board Side (4-40)	Steel, Tin Plated	Gold	7.5A	300V	-55°C ~ 125°C	Active	RoHS Compliant
09641127230	HARTING	Housing/Shell (Unthreaded)	Steel	-	7.5A	100V	-20°C ~ 125°C	Active	ROHS3 Compliant
09641127235	HARTING	Board Side (4-40)	Steel, Tin Plated	-	7.5A	100V	-20°C ~ 125°C	Active	ROHS3 Compliant
09661116503	HARTING	Mating Side, Female Screwlock (4-40)	Steel	-	6.5A	-	-55°C ~ 125°C	Active	ROHS3 Compliant
09661117503	HARTING	Mating Side, Female Screwlock (4-40)	Steel	-	6.5A	-	-55°C ~ 125°C	Active	ROHS3 Compliant
09661556513	HARTING	Mating Side, Female Screwlock (4-40)	Steel	Gold	6.5A	-	-55°C ~ 125°C	Active	ROHS3 Compliant
172-009-212R021	NorComp Inc.	Board Side (4-40)	Steel, Tin Plated	Gold	5A	-	-50°C ~ 100°C	Obsolete	ROHS3 Compliant
172-E09-213R001	NorComp Inc.	Housing/Shell (Unthreaded)	Steel, Nickel Plated	Gold	5A	-	-50°C ~ 100°C	Active	ROHS3 Compliant
172-E09-213R021	NorComp Inc.	Board Side (4-40)	Steel, Nickel Plated	Gold	5A	-	-50°C ~ 100°C	Active	ROHS3 Compliant
172-E09-213R911	NorComp Inc.	Board Side (4-40), Mating Side, Female Screwlock (4-40)	Steel, Nickel Plated	Gold	5A	-	-50°C ~ 100°C	Active	ROHS3 Compliant
2-338313-2	TE Connectivity AMP Connectors	Housing/Shell (M3)	Steel, Tin Plated	Gold	6A	-	-55°C ~ 105°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Equivalents (Direct Substitution):

09641127235 (HARTING) is the closest electrical and mechanical equivalent to L77DEH09ST. Both feature board-side 4-40 flange mounting, steel tin-plated shells, and 7.5A current rating. The primary difference is the reduced 100V voltage rating (L77DEH09ST is rated 300V). Selection is appropriate for applications not requiring 300V voltage rating. Product status is Active with ROHS3 compliance.

09641127230 (HARTING) provides identical electrical characteristics (7.5A, 100V) with unthreaded shell flange. Selection is suitable when housing-mounted configuration is preferred. Product status is Active with ROHS3 compliance.

Secondary Equivalents (Application-Specific Substitution):

172-E09-213R021 (NorComp Inc.) matches the board-side 4-40 flange configuration and gold contact finish. Current rating is reduced to 5A and operating temperature maximum is 100°C (versus 125°C). Selection is appropriate for applications with lower power requirements. Product status is Active with ROHS3 compliance.

2-338313-2 (TE Connectivity AMP Connectors) provides board-lock features with reduced M3 flange mounting. Current rating is 6A and operating temperature range is -55°C to 105°C. Selection is appropriate for applications requiring mechanical board-locking feature. Product status is Active with ROHS3 compliance.

Conditional Equivalents (Limited Substitution):

172-E09-213R911 (NorComp Inc.) provides dual flange features (board-side and mating-side screwlock). Current rating is 5A and operating temperature maximum is 100°C. Selection is appropriate for applications requiring mating-side screwlock feature with lower power requirements. Product status is Active with ROHS3 compliance.

HARTING parts with Mating Side Female Screwlock (09661116503, 09661117503, 09661556513) provide screwlock mating features. Current rating is reduced to 6.5A. Operating temperature range matches the original (−55°C to 125°C). Selection is appropriate when mating-side screwlock feature is required. All parts are Active with ROHS3 compliance.

172-009-212R021 (NorComp Inc.) is marked as Obsolete and should be avoided for new designs. Existing inventory may be considered only when obsolescence risk is acceptable.

Frequently Asked Questions (FAQ)

Q: Can I substitute any of these parts directly into a circuit designed for L77DEH09ST?

A: Direct substitution depends on application requirements. All listed parts maintain the 9-position D-Sub receptacle configuration, through-hole solder termination, and UL94 V-0 flammability rating. Verify that your application does not rely on the L77DEH09ST's 300V voltage rating before selecting HARTING or NorComp alternatives with lower voltage ratings. Similarly, confirm that 5A to 6.5A current ratings are sufficient if using NorComp or certain HARTING variants.

Q: What is the difference between board-side and mating-side flange mounting?

A: Board-side flanges (4-40) are mounted and secured on the circuit board side of the connector. Mating-side female screwlock flanges are positioned on the connector's mating end, allowing secure locking at the connector interface. The choice depends on your PCB layout and mechanical assembly requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. L77DEH09ST is RoHS Compliant. All listed substitutes are ROHS3 Compliant. Both compliance levels meet current regulatory requirements.

Q: Does the gold contact finish affect substitution compatibility?

A: Contact finish does not affect electrical functionality in standard applications. L77DEH09ST features gold contacts (0.203µm thickness). Most HARTING substitutes do not specify contact finish, while NorComp and TE Connectivity alternatives provide gold contact finish (flash thickness). Gold finish offers enhanced corrosion resistance; unspecified finishes remain acceptable for standard applications.

Q: Which substitute provides the lowest cost without significant performance trade-offs?

A: Cost information is not provided in the component data. Consult your supplier for current pricing. From an engineering perspective, 09641127235 (HARTING) offers the closest electrical match to L77DEH09ST with only voltage rating reduction (100V vs. 300V), making it the primary cost-effective alternative if 100V meets your application requirements.

Q: What are the operating temperature constraints when substituting?

A: L77DEH09ST operates from -55°C to 125°C. HARTING parts maintain this range. NorComp alternatives are limited to -50°C to 100°C. TE Connectivity is rated -55°C to 105°C. Select parts that match or exceed your application's temperature requirements.

Q: Can I use 172-009-212R021 in new designs?

A: 172-009-212R021 is marked as Obsolete. It should not be selected for new designs. Use only if design revisions to existing products require inventory matching and obsolescence risk is documented and accepted.

Q: How do I determine if a particular substitute is compatible with my specific application?

A: Confirm compatibility by verifying: (1) Connector type remains Receptacle, Female Sockets, 9-position, D-Sub 1 (DE, E); (2) Mounting type remains Through Hole with solder termination; (3) Voltage rating meets or exceeds your circuit voltage; (4) Current rating meets or exceeds your load current; (5) Operating temperature range covers your application environment; (6) Flange feature is compatible with your PCB layout.

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