L77DB25SOL2VF D-Sub 25 Position Receptacle Connector Equivalent & Substitute Parts

Part Overview

The L77DB25SOL2VF is a 25 position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features female sockets with vertical through-hole solder termination and mating-side female screwlock fastening. The part maintains active product status with 683 units in current inventory.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative sourcing is required for supply chain optimization, or when design flexibility permits selection from multiple qualified manufacturers. Substitute connectors must maintain electrical and mechanical compatibility within the D-Sub 25 position receptacle category while meeting the same functional requirements.

Key Parameters

Parameter	L77DB25SOL2VF Specification
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
Flange Feature	Mating Side, Female Screwlock (4-40)
Shell Material, Finish	Steel, Tin Plated
Contact Finish	Gold
Current Rating	7.5A
Voltage Rating	300V
Operating Temperature Range	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution logic for D-Sub 25 position receptacle connectors is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Connector type (Receptacle, Female Sockets)
Number of positions (25)
Number of rows (2)
Shell size and layout (3 / DB, B)
Termination method (Solder)
Contact type (Signal)
Material flammability rating (UL94 V-0)

Electrical Compatibility Parameters:

Current rating must equal or exceed 7.5A
Voltage rating must equal or exceed 300V
Operating temperature range must encompass -55°C ~ 125°C or be compatible with application requirements

Mechanical Compatibility Parameters:

Mounting type (Through Hole)
Contact material and finish (Gold plated contacts)
Shell material (Steel with appropriate plating)

Compliance Parameters:

RoHS compliance status
ECCN classification (EAR99)

Substitute parts are grouped into two categories: Direct Through-Hole Substitutes (identical mounting orientation) and Panel Mount Alternatives (different flange configuration, requiring design accommodation). Panel mount alternatives are listed for reference but require mechanical redesign consideration.

Parameter Comparison

Parameter	L77DB25SOL2VF	2-338315-2	6-338315-2	D25S24A4GL00LF	D25S24A4GX00LF
Manufacturer	Amphenol ICC	TE Connectivity AMP	TE Connectivity AMP	Amphenol ICC (FCI)	Amphenol ICC (FCI)
Connector Type	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets
Positions	25	25	25	25	25
Rows	2	2	2	2	2
Shell Size	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder	Solder
Flange Feature	Mating Side, Female Screwlock (4-40)	Housing/Shell (M3)	Housing/Shell (4-40)	Housing/Shell (M3)	Housing/Shell (4-40)
Shell Material, Finish	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin-Nickel Plated	Steel, Tin-Nickel Plated
Contact Finish	Gold	Gold	Gold	Gold	Gold
Current Rating	7.5A	6A	6A	5A per Contact	5A per Contact
Voltage Rating	300V	Not Specified	Not Specified	300V	300V
Operating Temperature	-55°C ~ 125°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 125°C
UL94 Rating	V-0	V-0	V-0	V-0	V-0
RoHS Status	RoHS Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant
Inventory	683 Pcs	1204 Pcs	1779 Pcs	1351 Pcs	1269 Pcs

Engineering Selection Recommendations

Primary Direct Substitutes (Highest Compatibility):

D25S24A4GX00LF (Amphenol ICC FCI, Delta D Series) is the preferred substitute. This part maintains identical electrical specifications (300V, -55°C ~ 125°C), equivalent current rating (5A per contact), and RoHS compliance. The flange configuration differs (Housing/Shell 4-40 versus Mating Side Female Screwlock 4-40), requiring mechanical accommodation in the connector interface design. Both parts use gold-plated contacts and UL94 V-0 rated dielectric materials.

D25S24A4GL00LF (Amphenol ICC FCI, Delta D Series) provides equivalent electrical performance with identical voltage and temperature ratings. The M3 flange configuration differs from the primary part, necessitating mechanical redesign. This part is suitable when M3 fastening is compatible with the application.

Secondary Substitutes (Electrical Derating Required):

2-338315-2 and 6-338315-2 (TE Connectivity AMPLIMITE HDP-20 Series) are functionally compatible through-hole receptacles with the following considerations: current rating is 6A (versus 7.5A), and maximum operating temperature is 105°C (versus 125°C). These parts are suitable for applications where the reduced current and temperature specifications do not exceed design requirements. Both maintain RoHS compliance and UL94 V-0 flammability rating. The 2-338315-2 uses M3 flange fastening; the 6-338315-2 uses 4-40 fastening.

Panel Mount Alternatives (Design Modification Required):

The NorComp 172 Series (172-025-212R011, 172-025-212R021) and 172-E Series (172-E25-213R001, 172-E25-213R011, 172-E25-213R031, 172-E25-213R911) are panel mount receptacles with board-side or mating-side flanges. These parts require mechanical redesign to accommodate panel mounting instead of vertical through-hole mounting. Current ratings are 5A, and operating temperature range is -50°C ~ 100°C. These alternatives are listed for reference in applications where panel mounting is acceptable.

Compliance Verification:

All listed substitutes maintain UL94 V-0 flammability rating and RoHS compliance status. ECCN classification is EAR99 for all parts. HTSUS codes are consistent within the D-Sub connector category (8536.69.4040 or 8536.69.8000).

Frequently Asked Questions (FAQ)

Q: Can D25S24A4GX00LF directly replace L77DB25SOL2VF without PCB modification?

A: The connectors are electrically and mechanically compatible for solder termination and through-hole mounting. However, the flange configuration differs: L77DB25SOL2VF uses mating-side female screwlock (4-40), while D25S24A4GX00LF uses housing/shell (4-40). PCB footprint and mounting hole pattern must be verified for compatibility. If the PCB is designed for mating-side fastening, mechanical accommodation is required.

Q: What is the significance of the current rating difference between L77DB25SOL2VF (7.5A) and substitute parts rated at 5A or 6A?

A: Current rating represents the maximum continuous current per contact. If the application requires current levels exceeding the substitute part's rating, that substitute is not suitable. For applications operating at or below 5A per contact, the lower-rated substitutes are acceptable. Verify actual circuit current requirements before selection.

Q: Are the TE Connectivity 2-338315-2 and 6-338315-2 interchangeable with each other?

A: Both parts are identical except for packaging (Bulk versus Tray) and flange fastening: 2-338315-2 uses M3 fastening, while 6-338315-2 uses 4-40 fastening. They are not interchangeable if the PCB mounting holes are designed for a specific fastener size. Verify the PCB hole pattern before selection.

Q: Why do NorComp 172-E Series parts show higher inventory (1000+ units) compared to other substitutes?

A: Inventory levels reflect current stock availability and do not indicate technical superiority or preference. Inventory quantities are subject to change and should not be the primary selection criterion. Selection should be based on electrical compatibility, mechanical fit, and compliance requirements.

Q: Can panel mount D-Sub receptacles (NorComp 172 Series) be used in applications designed for vertical through-hole connectors?

A: Panel mount receptacles require mechanical redesign of the mounting interface. The connector orientation, PCB hole pattern, and fastening method differ fundamentally from vertical through-hole designs. Panel mount alternatives are not suitable for direct substitution without significant design modification.

Q: What does "Board Lock" feature mean in the connector specifications?

A: Board Lock is a mechanical feature that provides additional retention between the connector and PCB. This feature is present in some substitute parts (2-338315-2, D25S24A4GL00LF, D25S24A4GX00LF) but not in the primary L77DB25SOL2VF. The presence or absence of Board Lock does not affect electrical compatibility but may influence mechanical robustness in high-vibration environments.

Q: Are all listed substitutes RoHS compliant?

A: Yes. All listed substitute parts maintain RoHS compliance status (RoHS Compliant or ROHS3 Compliant). The primary part L77DB25SOL2VF is RoHS Compliant. Compliance status is consistent across all alternatives.

Q: What is the difference between Tin Plated and Tin-Nickel Plated shell finishes?

A: Both finishes provide corrosion protection for the steel shell. Tin-Nickel plating (used in D25S24 series) offers enhanced corrosion resistance compared to Tin plating alone. For standard industrial applications, both finishes are acceptable. Selection may depend on environmental exposure requirements and cost considerations.

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