L77DB25STVFM D-Sub Receptacle 25-Position Equivalent and Substitute Parts

Part Overview

The Amphenol ICC L77DB25STVFM is a 25-position D-Sub receptacle connector with female sockets, designed for through-hole mounting and solder termination. This connector is classified as an active product with RoHS compliance and is widely used in signal distribution applications requiring robust interconnection. Alternative models are necessary when specific mounting configurations, flange features, or shell material specifications differ from the original design requirements.

Key Parameters

Parameter	L77DB25STVFM Specification
Connector Type	Receptacle, Female Sockets
Number of Positions	25
Shell Size / Layout	Size 3 (DB, B)
Mounting Type	Through Hole
Flange Feature	Mating Side, Female Screwlock (M3)
Termination	Solder
Shell Material / Finish	Steel, Tin Plated
Contact Finish	Gold
Current Rating	7.5A
Voltage Rating	300V
Operating Temperature Range	-55°C to 125°C
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts are grouped based on compatibility with the following key parameters that determine functional equivalence:

Primary Compatibility Criteria:

Connector Type: Receptacle, Female Sockets (all substitutes meet this requirement)
Number of Positions: 25 (all substitutes match)
Shell Size / Layout: Size 3 (DB, B) (all substitutes match)
Termination: Solder (all substitutes match)
Material Flammability Rating: UL94 V-0 (all substitutes meet or exceed)

Differentiating Parameters:

Mounting Type: Through Hole vs. Panel Mount
Flange Feature: Mating Side, Board Side, or Housing/Shell configurations
Shell Material Finish: Tin Plated vs. Nickel Plated
Current Rating: 7.5A (main part) vs. 5A–6A (substitutes)
Operating Temperature: -55°C to 125°C (main part) vs. -50°C to 100°C–105°C (substitutes)
Product Status: Active vs. Obsolete
Compliance: RoHS Compliant, ROHS3 Compliant, or REACH designations

Substitutes are organized by manufacturer and series, with attention to mounting configuration and thermal/electrical performance specifications.

Parameter Comparison

Part Number	Manufacturer	Mounting Type	Flange Feature	Shell Material / Finish	Current Rating	Operating Temperature	Product Status	RoHS Status
L77DB25STVFM	Amphenol ICC	Through Hole	Mating Side, Female Screwlock (M3)	Steel, Tin Plated	7.5A	-55°C to 125°C	Active	RoHS Compliant
172-025-212R011	NorComp Inc.	Panel Mount, Through Hole	Board Side (4-40)	Steel, Tin Plated	5A	-50°C to 100°C	Obsolete	ROHS3 Compliant
172-025-212R021	NorComp Inc.	Panel Mount, Through Hole	Board Side (4-40)	Steel, Tin Plated	5A	-50°C to 100°C	Obsolete	ROHS3 Compliant
172-E25-213R001	NorComp Inc.	Panel Mount, Through Hole	Housing/Shell (Unthreaded)	Steel, Nickel Plated	5A	-50°C to 100°C	Active	ROHS3 Compliant
172-E25-213R011	NorComp Inc.	Panel Mount, Through Hole	Board Side (4-40)	Steel, Nickel Plated	5A	-50°C to 100°C	Active	ROHS3 Compliant
172-E25-213R031	NorComp Inc.	Panel Mount, Through Hole	Mating Side (4-40)	Steel, Nickel Plated	5A	-50°C to 100°C	Active	ROHS3 Compliant
172-E25-213R911	NorComp Inc.	Panel Mount, Through Hole	Board Side (4-40), Mating Side, Female Screwlock (4-40)	Steel, Nickel Plated	5A	-50°C to 100°C	Active	ROHS3 Compliant
2-338315-2	TE Connectivity AMP Connectors	Through Hole	Housing/Shell (M3)	Steel, Tin Plated	6A	-55°C to 105°C	Active	ROHS3 Compliant
6-338315-2	TE Connectivity AMP Connectors	Through Hole	Housing/Shell (4-40)	Steel, Tin Plated	6A	-55°C to 105°C	Active	RoHS Compliant
D25S24A4GL00LF	Amphenol ICC (FCI)	Through Hole	Housing/Shell (M3)	Steel, Tin-Nickel Plated	5A per Contact	-55°C to 125°C	Active	RoHS Compliant
D25S24A4GX00LF	Amphenol ICC (FCI)	Through Hole	Housing/Shell (4-40)	Steel, Tin-Nickel Plated	5A per Contact	-55°C to 125°C	Active	RoHS Compliant

Engineering Selection Recommendations

For Through-Hole Mounting with Mating-Side Screwlock (M3): The L77DB25STVFM remains the primary specification. The 2-338315-2 (TE Connectivity AMPLIMITE HDP-20 series) provides an active alternative with comparable electrical performance and housing configuration. Both parts are tin-plated steel with RoHS compliance and support the same operating temperature floor of -55°C.

For Through-Hole Mounting with Expanded Temperature Support: The D25S24A4GL00LF and D25S24A4GX00LF (Amphenol FCI Delta D series) match the L77DB25STVFM operating temperature range of -55°C to 125°C. These parts employ tin-nickel plating for enhanced corrosion resistance and are RoHS Compliant. Selection between GL and GX variants depends on flange configuration requirements (M3 vs. 4-40).

For Panel-Mount Applications: The NorComp 172-E25 series (172-E25-213R001, 172-E25-213R011, 172-E25-213R031, 172-E25-213R911) provides active alternatives supporting panel mounting with through-hole options. All are ROHS3 Compliant and nickel-plated. The 172-E25-213R911 includes dual flange features (Board Side 4-40 and Mating Side Female Screwlock 4-40) with board lock functionality.

Product Status Considerations: NorComp parts 172-025-212R011 and 172-025-212R021 are classified as obsolete; these should be substituted with active alternatives from the 172-E25 series if procurement continuity is required.

Current Rating Derating: The L77DB25STVFM is rated at 7.5A; most NorComp and Amphenol FCI substitutes are rated at 5A–5A per contact. TE Connectivity AMPLIMITE HDP-20 variants support 6A. Applications exceeding 6A per contact require confirmation of the original L77DB25STVFM specification.

Frequently Asked Questions (FAQ)

Q: Can I substitute a panel-mount D-Sub 25-position connector for the through-hole L77DB25STVFM? A: Direct mechanical substitution is not possible without board layout modification. Panel-mount connectors require cutout openings in the PCB; through-hole connectors require plated via holes. NorComp 172-E25 series supports both mounting types in a single connector. Verify mounting hole pattern compatibility before selection.

Q: What is the difference between M3 and 4-40 flange specifications? A: These refer to fastening standards for the mating-side or board-side flange. M3 indicates metric M3 threaded inserts; 4-40 indicates unified coarse thread (UNC). Selection depends on the mating connector's flange specification. Ensure mechanical compatibility before substitution.

Q: Are NorComp 172-025 obsolete parts available for new designs? A: The 172-025-212R011 and 172-025-212R021 are designated obsolete. Amphenol ICC recommends transitioning to the active 172-E25 series (172-E25-213R001, 172-E25-213R011, 172-E25-213R031, 172-E25-213R911) for design continuity and sustained supply chain support.

Q: Does the L77DB25STVFM meet REACH compliance? A: The L77DB25STVFM is RoHS Compliant with no REACH statement provided in the component data. The NorComp 172-E25 series is both ROHS3 Compliant and REACH Unaffected. TE Connectivity 2-338315-2 is ROHS3 Compliant with vendor-undefined REACH status; 6-338315-2 is RoHS Compliant and REACH Affected. Confirm regulatory requirements for your application region.

Q: Can I use D-Sub 25-position substitutes from different manufacturers interchangeably? A: Size 3 (DB, B) connectors meeting the same position count and shell layout are mechanically compatible. However, flange feature, current rating, and operating temperature specifications must match or exceed application requirements. Verify shell material compatibility (tin-plated vs. nickel-plated) and contact finish specifications in EMI-sensitive applications.

Q: What is the maximum continuous current for each substitute? A: The L77DB25STVFM supports 7.5A continuous; TE Connectivity AMPLIMITE HDP-20 (2-338315-2, 6-338315-2) support 6A; Amphenol FCI Delta D (D25S24A4GL00LF, D25S24A4GX00LF) support 5A per contact; NorComp 172-E25 series support 5A. Circuit design requiring currents exceeding 6A per pin should confirm the original L77DB25STVFM specification or evaluate multi-pin parallel configurations.

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