L177DFB25SOL2 D-Sub Receptacle Equivalent & Substitute Parts

Part Overview

The L177DFB25SOL2 is a 25-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This panel-mount, solder-termination connector features female sockets in a 2-row configuration with shell size 3 (DB, B) layout. The connector is actively produced and widely used in applications requiring robust signal transmission with high current capacity and extended temperature operation.

Substitute parts are necessary when the primary part becomes unavailable, when alternative mounting configurations are required, or when design specifications allow for compatible alternatives from different manufacturers. The parts listed below maintain electrical and mechanical compatibility within defined parameter ranges.

Key Parameters

Parameter	L177DFB25SOL2 Specification
Connector Type	Receptacle, Female Sockets
Number of Positions	25
Number of Rows	2
Shell Size, Connector Layout	3 (DB, B)
Mounting Type	Panel Mount, Through Hole
Termination	Solder
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
Product Status	Active

Substitute Part Grouping Explanation

Substitution compatibility for the L177DFB25SOL2 is determined by the following critical parameters:

Mandatory Matching Parameters:

Connector Type: Receptacle, Female Sockets
Number of Positions: 25
Number of Rows: 2
Shell Size, Connector Layout: 3 (DB, B)
Termination: Solder
Material Flammability Rating: UL94 V-0

Allowable Variation Parameters:

Mounting Type: Panel Mount variants with Through Hole termination
Flange Feature: Housing/Shell (Unthreaded) or Board Side configurations
Shell Material Finish: Steel with Tin Plated or Nickel Plated finishes
Contact Finish Thickness: 30.0µin or Flash thickness
Current Rating: 5A to 7.5A per contact
Voltage Rating: 300V or unspecified (backward compatible)
Operating Temperature: -50°C to -55°C minimum; 100°C to 125°C maximum
Contact Material: Copper Alloy, Brass, or Phosphor Bronze
Dielectric Material: Thermoplastic, Glass Filled; Polybutylene Terephthalate (PBT); Polyamide (PA6T)

Substitute parts must maintain the same connector style (D-Sub), contact type (Signal), and solder termination method. Variations in flange design, shell finish, and contact material are acceptable provided electrical performance and mechanical fit remain within specification.

Parameter Comparison

Part Number	Manufacturer	Positions	Rows	Shell Size	Mounting Type	Flange Feature	Termination	Shell Finish	Contact Finish	Current Rating (A)	Voltage Rating (V)	Temp Range (°C)	Product Status	RoHS Status
L177DFB25SOL2	Amphenol ICC	25	2	3 (DB, B)	Panel Mount, Through Hole	Housing/Shell (Unthreaded)	Solder	Steel, Tin Plated	Gold	7.5	300	-55 ~ 125	Active	RoHS Compliant
172-025-212R011	NorComp Inc.	25	2	3 (DB, B)	Panel Mount, Through Hole	Board Side (4-40)	Solder	Steel, Tin Plated	Gold	5	—	-50 ~ 100	Obsolete	ROHS3 Compliant
172-025-212R021	NorComp Inc.	25	2	3 (DB, B)	Panel Mount, Through Hole	Board Side (4-40)	Solder	Steel, Tin Plated	Gold	5	—	-50 ~ 100	Obsolete	ROHS3 Compliant
172-E25-213R001	NorComp Inc.	25	2	3 (DB, B)	Panel Mount, Through Hole	Housing/Shell (Unthreaded)	Solder	Steel, Nickel Plated	Gold	5	—	-50 ~ 100	Active	ROHS3 Compliant
172-E25-213R911	NorComp Inc.	25	2	3 (DB, B)	Panel Mount, Through Hole	Board Side (4-40)	Solder	Steel, Nickel Plated	Gold	5	—	-50 ~ 100	Active	ROHS3 Compliant
2-338315-2	TE Connectivity AMP	25	2	3 (DB, B)	Through Hole	Housing/Shell (M3)	Solder	Steel, Tin Plated	Gold	6	—	-55 ~ 105	Active	ROHS3 Compliant
6-338315-2	TE Connectivity AMP	25	2	3 (DB, B)	Through Hole	Housing/Shell (4-40)	Solder	Steel, Tin Plated	Gold	6	—	-55 ~ 105	Active	RoHS Compliant
D25S24A4GL00LF	Amphenol ICC (FCI)	25	2	3 (DB, B)	Through Hole	Housing/Shell (M3)	Solder	Steel, Tin-Nickel Plated	Gold	5	300	-55 ~ 125	Active	RoHS Compliant
D25S24A4GX00LF	Amphenol ICC (FCI)	25	2	3 (DB, B)	Through Hole	Housing/Shell (4-40)	Solder	Steel, Tin-Nickel Plated	Gold	5	300	-55 ~ 125	Active	RoHS Compliant
D25S24A4PL00LF	Amphenol ICC (FCI)	25	2	3 (DB, B)	Through Hole	Housing/Shell (M3)	Solder	Steel, Tin-Nickel Plated	Gold	5	300	-55 ~ 125	Active	RoHS Compliant
D25S24A4PX00LF	Amphenol ICC (FCI)	25	2	3 (DB, B)	Through Hole	Housing/Shell (4-40)	Solder	Steel, Tin-Nickel Plated	Gold	5	300	-55 ~ 125	Active	RoHS Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compliance):

The Amphenol ICC (FCI) Delta D series connectors (D25S24A4GL00LF, D25S24A4GX00LF, D25S24A4PL00LF, D25S24A4PX00LF) are direct functional equivalents to the L177DFB25SOL2. These parts maintain identical connector geometry, 25-position configuration, solder termination, and operating temperature range (-55°C ~ 125°C). All Delta D variants carry RoHS Compliant certification and 300V voltage rating matching the primary part. Differences in flange design (M3 versus 4-40 mounting holes) and shell finish (Tin-Nickel versus Tin Plated) do not affect electrical performance. Current rating of 5A per contact is within acceptable operating parameters for most applications, though the primary part offers 7.5A capacity.

Secondary Substitutes (Active Status, Reduced Current Rating):

The TE Connectivity AMPLIMITE HDP-20 series (2-338315-2 and 6-338315-2) provide functional equivalence with 6A current rating and -55°C ~ 105°C operating range. These connectors maintain the 25-position, 2-row D-Sub configuration with solder termination and UL94 V-0 flammability rating. The 6-338315-2 variant with 4-40 flange mounting offers closer mechanical compatibility to the L177DFB25SOL2 panel-mount design. Both variants carry ROHS3 or RoHS Compliant certification.

Alternative Substitutes (Active Status, Lower Current Rating):

The NorComp 172-E series (172-E25-213R001 and 172-E25-213R911) are actively produced alternatives with 5A current rating and -50°C ~ 100°C operating range. These connectors maintain 25-position configuration, solder termination, and UL94 V-0 rating. The 172-E25-213R001 with unthreaded housing/shell flange provides the closest mechanical match to the primary part. Both variants carry ROHS3 Compliant certification.

Obsolete Alternatives (Not Recommended for New Designs):

The NorComp 172-025 series (172-025-212R011 and 172-025-212R021) are obsolete products. While electrically compatible with 25-position configuration and solder termination, these parts are no longer in active production. Substitution with these parts is not recommended for new designs or long-term supply chain planning.

Frequently Asked Questions (FAQ)

Q: Can the L177DFB25SOL2 be directly replaced with a D25S24A4GL00LF?

A: Yes. Both connectors maintain identical 25-position, 2-row D-Sub configuration with solder termination, gold-plated contacts, and UL94 V-0 flammability rating. Operating temperature ranges (-55°C ~ 125°C) and voltage ratings (300V) are identical. The primary difference is flange design (M3 mounting holes on the D25S24A4GL00LF versus unthreaded housing on the L177DFB25SOL2). Mechanical fit must be verified for the specific panel mounting application.

Q: What is the difference between the L177DFB25SOL2 and the 172-E25-213R001?

A: Both connectors are 25-position D-Sub receptacles with solder termination and gold-plated contacts. Key differences include: (1) Current rating: L177DFB25SOL2 supports 7.5A versus 5A for the 172-E25-213R001; (2) Operating temperature: L177DFB25SOL2 operates to 125°C versus 100°C maximum for the 172-E25-213R001; (3) Voltage rating: L177DFB25SOL2 is rated 300V while the 172-E25-213R001 has no specified voltage rating; (4) Shell finish: L177DFB25SOL2 uses Tin Plated steel versus Nickel Plated steel on the 172-E25-213R001. The L177DFB25SOL2 is suitable for higher-current and higher-temperature applications.

Q: Are the NorComp 172-025 series parts suitable for new product designs?

A: No. The 172-025-212R011 and 172-025-212R021 are classified as Obsolete products. While electrically and mechanically compatible with the L177DFB25SOL2, obsolete parts present supply chain risk and are not recommended for new designs. Active alternatives such as the NorComp 172-E series or Amphenol ICC Delta D series should be selected instead.

Q: What is the significance of the flange feature differences (Housing/Shell versus Board Side)?

A: The flange feature determines the mechanical mounting method. Housing/Shell (Unthreaded) flanges, as found on the L177DFB25SOL2, mount directly to panel cutouts without threaded fasteners. Board Side (4-40) flanges, as found on the 172-025-212R021 and 172-E25-213R911, mount to circuit board edges using 4-40 threaded fasteners. These are not interchangeable without mechanical redesign of the mounting interface. Selection depends on the specific panel or board mounting configuration required.

Q: Can the L177DFB25SOL2 be substituted with a TE Connectivity 2-338315-2 in applications requiring 7.5A current?

A: No. The TE Connectivity 2-338315-2 is rated for 6A maximum current, which is below the 7.5A rating of the L177DFB25SOL2. In applications requiring the full 7.5A capacity, the primary part or equivalent Amphenol ICC parts must be used. The 2-338315-2 is suitable for applications with current requirements up to 6A.

Q: What packaging differences exist between substitute parts?

A: The L177DFB25SOL2 is supplied in Tray packaging. Most substitute parts (172-025-212R021, 172-E25-213R001, 172-E25-213R911, D25S24A4GL00LF, D25S24A4GX00LF, D25S24A4PL00LF, D25S24A4PX00LF) are also supplied in Tray packaging. The TE Connectivity 2-338315-2 is supplied in Bulk packaging. Packaging differences do not affect electrical or mechanical compatibility but may impact inventory management and handling procedures.

Q: Are all substitute parts RoHS compliant?

A: Yes. The L177DFB25SOL2 and all listed substitute parts carry RoHS Compliant or ROHS3 Compliant certification. This ensures compliance with Restriction of Hazardous Substances regulations across all alternatives.

Q: What is the operating temperature limitation when substituting with NorComp 172-E series parts?

A: The NorComp 172-E series (172-E25-213R001 and 172-E25-213R911) are rated for -50°C ~ 100°C operation, compared to the L177DFB25SOL2 rating of -55°C ~ 125°C. Applications requiring operation below -50°C or above 100°C must use the primary part or equivalent Amphenol ICC or TE Connectivity alternatives that support the full temperature range.

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