L77DBH25SOL2RM8 D-Sub Receptacle Connector – Equivalent & Substitute Parts

Part Overview

The L77DBH25SOL2RM8 is a 25 Position D-Sub Receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features vertical mounting through solder termination and is designed for signal applications with a 7.5A current rating and 300V voltage rating. The part is currently in Active product status with 994 pieces in inventory.

Equivalent and substitute parts are necessary when the primary component becomes unavailable, when design requirements permit alternative specifications, or when procurement advantages exist through alternative manufacturers. The substitute parts listed below maintain compatibility based on shared electrical and mechanical parameters including connector style, position count, mounting type, shell size, and termination method.

Key Parameters

Parameter	Specification
Connector Style	D-Sub
Connector Type	Receptacle, Female Sockets
Number of Positions	25
Number of Rows	2
Shell Size, Connector Layout	3 (DB, B)
Mounting Type	Through Hole
Termination	Solder
Contact Type	Signal
Shell Material, Finish	Steel, Tin Plated
Contact Finish	Gold
Contact Material	Brass
Current Rating (Amps)	7.5A
Voltage Rating	300V
Operating Temperature	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution compatibility for D-Sub receptacle connectors is determined by the following core parameters: connector style (D-Sub), connector type (Receptacle with Female Sockets), number of positions (25), number of rows (2), shell size layout (3 / DB, B), mounting type (Through Hole or Panel Mount/Through Hole), contact type (Signal), and termination method (Solder).

Additional factors influencing substitution viability include current rating, voltage rating, operating temperature range, shell material finish, contact finish, contact material, and RoHS compliance status. Parts that vary in flange feature design (Board Side vs. Housing/Shell), shell finish (Tin Plated vs. Tin-Nickel vs. Nickel Plated), or dielectric material may still function as direct substitutes if the core electrical parameters align with or exceed application requirements.

The substitute parts identified below share the critical D-Sub 25-position receptacle configuration. Variations in product status (Active vs. Obsolete), current rating (5A to 7.5A), voltage rating specification, temperature operating range limits, and RoHS compliance are documented to enable informed engineering selection.

Parameter Comparison

Parameter	L77DBH25SOL2RM8	172-025-212R011	172-025-212R021	172-E25-213R001	172-E25-213R911	2-338315-2	6-338315-2	D25S24A4GL00LF	D25S24A4GX00LF	D25S24A4PL00LF	D25S24A6GX00LF
Manufacturer	Amphenol ICC	NorComp Inc.	NorComp Inc.	NorComp Inc.	NorComp Inc.	TE Connectivity	TE Connectivity	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)
Connector Type	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets
Number of Positions	25	25	25	25	25	25	25	25	25	25	25
Number of Rows	2	2	2	2	2	2	2	2	2	2	2
Shell Size, Connector Layout	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)
Mounting Type	Through Hole	Panel Mount, Through Hole	Panel Mount, Through Hole	Panel Mount, Through Hole	Panel Mount, Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Contact Type	Signal	Signal	Signal	Signal	Signal	Signal	Signal	Signal	Signal	Signal	Signal
Current Rating (Amps)	7.5A	5A	5A	5A	5A	6A	6A	5A per Contact	5A per Contact	5A per Contact	5A per Contact
Voltage Rating	300V	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	300V	300V	300V	300V
Operating Temperature	-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	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Shell Material, Finish	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Nickel Plated	Steel, Nickel Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin-Nickel Plated	Steel, Tin-Nickel Plated	Steel, Tin-Nickel Plated	Steel, Tin-Nickel Plated
Contact Finish	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold
Contact Material	Brass	Brass	Brass	Brass	Brass	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Material 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	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant
Product Status	Active	Obsolete	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Current and Voltage Rating Equivalents: The D25S24A4GL00LF, D25S24A4GX00LF, D25S24A4PL00LF, and D25S24A6GX00LF (Amphenol ICC FCI Delta D series) maintain identical 300V voltage rating and full operating temperature range (-55°C ~ 125°C) matching the L77DBH25SOL2RM8. These parts are Active status and RoHS Compliant, offering complete electrical compatibility. Current rating of 5A per contact remains within acceptable limits for signal applications where the primary part specifies 7.5A aggregate capacity.

Reduced Temperature Range Alternatives: The NorComp 172-025-212R011, 172-025-212R021, 172-E25-213R001, and 172-E25-213R911 operate to -50°C ~ 100°C, which is reduced from the primary part specification. These parts are suitable only for applications with reduced temperature operating windows. The 172-E25-213R001 and 172-E25-213R911 are Active status with ROHS3 compliance, while 172-025-212R011 and 172-025-212R021 are Obsolete status products.

Panel Mount Considerations: NorComp substitute parts feature Panel Mount capability in addition to Through Hole mounting, which may not be compatible with board layouts designed exclusively for vertical Through Hole mounting. Direct mechanical fit confirmation is required before substitution of panel mount variants.

Alternative Manufacturer Solutions: TE Connectivity AMPLIMITE HDP-20 series (2-338315-2 and 6-338315-2) provide Active status alternatives with 6A current rating and operating range to 105°C. These parts utilize Phosphor Bronze contact material versus Brass, and offer varying RoHS compliance status (2-338315-2 is ROHS3 Compliant; 6-338315-2 is RoHS Compliant with REACH Affected designation).

Frequently Asked Questions (FAQ)

Q: Can NorComp 172-E25-213R001 or 172-E25-213R911 directly replace the L77DBH25SOL2RM8? A: These parts share the D-Sub 25-position receptacle configuration, solder termination, and gold contact finish. However, the operating temperature range is limited to -50°C ~ 100°C compared to the primary part's -55°C ~ 125°C. Substitution is viable only if your application does not require operation below -50°C or above 100°C. The 172-E25-213R001 and 172-E25-213R911 are both Active status with ROHS3 compliance.

Q: What is the difference between Through Hole and Panel Mount mounting types for D-Sub connectors? A: Through Hole mounting (primary part and most substitutes) secures the connector perpendicular to the PCB with solder connections through plated holes. Panel Mount Through Hole (NorComp 172 series) allows mounting flush to a panel or enclosure face while maintaining through-hole solder termination. Physical board layout must accommodate the mounting flange design; Through Hole-only designs cannot accept Panel Mount variants.

Q: Why do some substitute parts specify 5A current rating while the primary part rates 7.5A? A: The L77DBH25SOL2RM8 is rated at 7.5A aggregate current capacity. NorComp parts specify 5A, and Amphenol FCI Delta D parts specify 5A per contact. For signal applications with individual wire currents below the substitute part rating, this variation is acceptable. Review your specific current distribution across the 25 positions to confirm adequacy.

Q: Are Phosphor Bronze and Brass contacts interchangeable? A: Both materials are used in D-Sub receptacles and provide reliable signal transmission with gold plating. Contact material difference between the primary Brass contacts and substitute Phosphor Bronze contacts does not prevent functional substitution for standard signal applications. Material selection affects spring characteristics and wear resistance; both are acceptable for equivalent mechanical life in normal service conditions.

Q: What is the significance of voltage rating differences between parts? A: The L77DBH25SOL2RM8 and Amphenol FCI Delta D series specify 300V rated voltage. NorComp 172 series parts do not specify voltage rating in the provided data. Voltage rating indicates the maximum voltage the connector withstands in normal operation. If your circuit operates at or near rated voltage, verify that substitute parts with unspecified voltage ratings are cleared for your specific voltage environment.

Q: Why should I consider RoHS compliance status when selecting a substitute? A: The L77DBH25SOL2RM8 is RoHS non-compliant, while most substitute parts (Amphenol FCI Delta D, NorComp 172-E series, TE Connectivity) are RoHS Compliant or ROHS3 Compliant. If your end application or customer requirements mandate RoHS compliance, substitute parts provide compliance upgrades. Conversely, legacy designs using RoHS non-compliant parts may not require RoHS substitutes.

Q: Can I use a substitute part with reduced operating temperature range in my application? A: Substitution is viable only if your actual operating environment stays within both the primary and substitute part temperature ranges. For example, NorComp parts rated to -50°C ~ 100°C cannot replace the L77DBH25SOL2RM8 in applications requiring -55°C minimum or 125°C maximum operation. Verify your specific thermal requirements before accepting a reduced-range substitute.

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