L77DB25STVF

Part Overview

The L77DB25STVF is a 25-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products) in active product status. This through-hole solder-terminated connector features female sockets with mating-side screwlock fastening and is designed for general signal applications in industrial and commercial equipment. Equivalent and substitute parts become necessary when addressing supply chain constraints, design revision requirements, or manufacturing process compatibility while maintaining electrical and mechanical interface requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	L77DB25STVF
Connector Type	Receptacle, Female Sockets
Number of Positions	25
Shell Size, Connector Layout	3 (DB, B)
Mounting Type	Through Hole
Termination	Solder
Current Rating	7.5A
Voltage Rating	300V
Operating Temperature Range	-55°C to 125°C
Shell Material, Finish	Steel, Tin Plated
Contact Finish	Gold
Flange Feature	Mating Side, Female Screwlock (4-40)
RoHS Status	RoHS Compliant
Material Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

Substitution criteria for D-Sub receptacle connectors are determined by electrical and mechanical compatibility parameters. The following criteria establish valid substitutes for the L77DB25STVF:

Primary Matching Parameters:

Connector type and gender (Receptacle, Female Sockets)
Number of positions (25)
Shell size and layout (3 / DB, B)
Mounting type (Through Hole)
Termination method (Solder)
Material flammability rating (UL94 V-0)

Compatible Variance Allowed:

Current rating (substitute must meet or exceed 7.5A requirement, or be adequate for intended application)
Voltage rating (substitute requirements depend on circuit voltage)
Flange feature design (different mechanical fastening approaches are acceptable if mounting compatibility exists)
Operating temperature range (substitute range must encompass application requirements)
Shell finish (steel with tin or nickel plating are interchangeable in most applications)
Contact material and finish (brass or phosphor bronze with gold plating maintain signal integrity)
Dielectric material composition (thermoplastic or polyamide variants maintain electrical performance)

Substitutes are grouped into two categories: through-hole vertical orientation connectors (direct replacements) and panel-mount variants (require mechanical redesign).

Parameter Comparison

Parameter	L77DB25STVF	2-338315-2	6-338315-2	D25S24A4GL00LF	D25S24A4GX00LF
Manufacturer	Amphenol ICC (Commercial Products)	TE Connectivity AMP Connectors	TE Connectivity AMP Connectors	Amphenol ICC (FCI)	Amphenol ICC (FCI)
Product Status	Active	Active	Active	Active	Active
Connector Type	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets
Number of Positions	25	25	25	25	25
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)
Current Rating	7.5A	6A	6A	5A per Contact	5A per Contact
Voltage Rating	300V	-	-	300V	300V
Operating Temperature	-55°C to 125°C	-55°C to 105°C	-55°C to 105°C	-55°C to 125°C	-55°C to 125°C
Shell Material, Finish	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin-Nickel Plated	Steel, Tin-Nickel Plated
Contact Material	Brass	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Contact Finish	Gold	Gold	Gold	Gold	Gold
RoHS Status	RoHS Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0

Engineering Selection Recommendations

Direct Replacements (Active Status): The D25S24A4GL00LF and D25S24A4GX00LF (Amphenol ICC FCI series) are functionally equivalent to the L77DB25STVF within the same manufacturer ecosystem, maintaining identical 25-position, DB shell configuration and through-hole solder termination. Both parts are in active product status with RoHS compliance and UL94 V-0 flammability certification. Selection between these variants depends on flange fastening requirements: D25S24A4GL00LF features M3 metric fastening, while D25S24A4GX00LF uses 4-40 UNC fastening.

Alternative Manufacturers (Active Status): The 2-338315-2 and 6-338315-2 (TE Connectivity AMPLIMITE HDP-20 series) provide functionally compatible substitutes in active product status with full RoHS compliance. The 6-338315-2 features housing-shell fastening compatible with standard 4-40 mounting. Current rating for TE parts is 6A, which is below the L77DB25STVF specification; application current requirements must be verified before selection.

Obsolete Variants (Not Recommended for New Designs): NorComp 172-025-212R011 and 172-025-212R021 are in obsolete product status and should not be selected for new designs or long-term programs. However, the NorComp 172-E series (172-E25-213R001, 172-E25-213R011, 172-E25-213R031, 172-E25-213R911) are active variants with panel-mount configurations in nickel-plated steel shells and are suitable only if mechanical panel-mount integration is required.

Frequently Asked Questions (FAQ)

Q: Can I substitute the L77DB25STVF with parts that have lower current ratings? A: Current rating substitution depends on actual circuit current requirements. The L77DB25STVF is rated for 7.5A. The D25S24 series (5A per contact) and TE AMPLIMITE series (6A) may be suitable if application current does not exceed their rating. Engineering review of circuit current draw is required before selection.

Q: What is the difference between mounting types (Through Hole vs. Panel Mount)? A: The L77DB25STVF is designed for through-hole solder termination on printed circuit boards. NorComp panel-mount variants (172-E series) feature different mechanical designs requiring installation directly into an equipment enclosure panel. These are not mechanically interchangeable without redesign of the mounting interface.

Q: Are connector shells with different finishes (tin vs. nickel plating) interchangeable? A: Both tin-plated and nickel-plated steel shells meet UL94 V-0 flammability requirements and provide equivalent environmental protection in most applications. Selection should consider corrosion environment and EMI shielding requirements. Nickel plating offers superior corrosion resistance in harsh environments.

Q: What are the fastening differences between flange styles? A: The L77DB25STVF uses mating-side female screwlock fastening (4-40). Direct alternatives include M3 metric fastening (D25S24A4GL00LF) and 4-40 housing-shell fastening (6-338315-2, D25S24A4GX00LF). Fastening style affects cable connector mating and panel cutout dimensions. Equipment mechanical design determines compatibility.

Q: Which substitute parts are recommended for new production? A: For new designs, select from active-status parts: D25S24A4GL00LF or D25S24A4GX00LF (Amphenol FCI) for Amphenol continuity, or 6-338315-2 (TE Connectivity) for alternative-manufacturer supply. All three maintain 300V voltage rating, UL94 V-0 compliance, and full RoHS certification. NorComp obsolete parts (172-025 series) should not be used in new development.

Q: How do I verify compatibility for a specific application? A: Verify the following parameters match application requirements: connector shell size (DB-25), number of positions (25), mounting method (through-hole solder), operating temperature range encompassing -55°C to 125°C (or application limits), current per contact at or below substitute rating, and voltage rating at or above circuit voltage. Flange fastening style must match mechanical integration design.

Q: What is the RoHS compliance status of substitute parts? A: All recommended substitute parts (D25S24A4GL00LF, D25S24A4GX00LF, 2-338315-2, 6-338315-2) are RoHS Compliant or ROHS3 Compliant. The L77DB25STVF is RoHS Compliant. Obsolete NorComp variants (172-025 series) are ROHS3 Compliant; the active 172-E series are ROHS3 Compliant. RoHS compliance status should be confirmed with supplier datasheets for restricted substance compliance in regulated markets.

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