L177DFB25ST D-Sub 25 Position Panel Mount Receptacle Connector

Part Overview

The L177DFB25ST is a 25 position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features female sockets, panel mount through-hole termination, and solder attachment. The part is currently in active product status with 1016 units in stock.

Equivalent and 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. Substitute parts must maintain electrical and mechanical compatibility within the defined parameter ranges.

Key Parameters

Parameter	L177DFB25ST Value
Connector Type	Receptacle, Female Sockets
Number of Positions	25
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 (Amps)	7.5A
Voltage Rating	300V
Operating Temperature	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution of 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)
Shell size and layout (3 / DB, B)
Termination method (Solder)
Mounting configuration (Panel Mount, Through Hole)

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 to 125°C

Mechanical Compatibility Parameters:

Shell material and finish must be compatible with application environment
Contact finish (Gold) ensures signal integrity
Flange feature type determines mounting interface

Regulatory Compliance Parameters:

UL94 V-0 flammability rating
RoHS compliance status

Substitute parts are grouped based on whether they meet all mandatory parameters and maintain electrical performance within or above the specified ranges. Parts with lower current ratings, reduced voltage ratings, or narrower temperature ranges are not suitable substitutes.

Parameter Comparison

Parameter	L177DFB25ST	172-025-212R011	172-025-212R021	172-E25-213R001	172-E25-213R911	2-338315-2	6-338315-2	D25S24A4GL00LF	D25S24A4GX00LF	D25S24A4PL00LF	D25S24A4PX00LF
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
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	Panel Mount, 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
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
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
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 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

Primary Equivalent Parts (Full Compatibility):

The following parts maintain full electrical and mechanical compatibility with the L177DFB25ST:

D25S24A4GL00LF (Amphenol ICC FCI, Delta D Series): Matches all critical parameters including 7.5A equivalent current rating (5A per contact × 25 positions), 300V voltage rating, and -55°C to 125°C operating temperature. Active product status. RoHS compliant. Housing/Shell (M3) flange feature.
D25S24A4GX00LF (Amphenol ICC FCI, Delta D Series): Identical electrical specifications to D25S24A4GL00LF with Housing/Shell (4-40) flange feature variant. Active product status. RoHS compliant.
D25S24A4PL00LF (Amphenol ICC FCI, Delta D Series): Matches all critical parameters with Housing/Shell (M3) flange feature. Active product status. RoHS compliant.
D25S24A4PX00LF (Amphenol ICC FCI, Delta D Series): Identical electrical specifications with Housing/Shell (4-40) flange feature variant. Active product status. RoHS compliant.

Secondary Equivalent Parts (Reduced Electrical Performance):

The following parts meet mechanical and mounting requirements but operate at reduced current ratings:

2-338315-2 (TE Connectivity AMPLIMITE HDP-20): 6A current rating (below 7.5A specification). Operating temperature -55°C to 105°C (below 125°C maximum). Active product status. ROHS3 compliant. Board Lock feature. Through-hole mounting without panel mount specification.
6-338315-2 (TE Connectivity AMPLIMITE HDP-20): Identical specifications to 2-338315-2 with Housing/Shell (4-40) flange feature. Active product status. RoHS compliant.

Not Recommended (Insufficient Electrical Performance):

The following parts do not meet the electrical requirements of the L177DFB25ST:

172-025-212R011 (NorComp Inc., 172 Series): 5A current rating (below 7.5A). Operating temperature -50°C to 100°C (below specification). Obsolete product status. Board Side (4-40) flange feature.
172-025-212R021 (NorComp Inc., 172 Series): 5A current rating (below 7.5A). Operating temperature -50°C to 100°C (below specification). Obsolete product status. Board Side (4-40) flange feature.
172-E25-213R001 (NorComp Inc., 172-E Series): 5A current rating (below 7.5A). Operating temperature -50°C to 100°C (below specification). Active product status does not offset electrical limitations. Housing/Shell (Unthreaded) flange feature.
172-E25-213R911 (NorComp Inc., 172-E Series): 5A current rating (below 7.5A). Operating temperature -50°C to 100°C (below specification). Active product status does not offset electrical limitations. Board Lock feature with Board Side (4-40) flange.

Frequently Asked Questions (FAQ)

Q: Can I substitute a part with a lower current rating than the L177DFB25ST?

A: No. The L177DFB25ST is rated for 7.5A. Substitute parts with 5A or 6A ratings do not meet the electrical specification and will not function as equivalent components in applications requiring the full 7.5A capacity.

Q: What is the difference between Housing/Shell (M3) and Housing/Shell (4-40) flange features?

A: These designations indicate the mounting hole thread specification on the connector flange. M3 refers to metric M3 threads, while 4-40 refers to UNC (Unified National Coarse) threads. Both are panel mount configurations; selection depends on the panel mounting hardware available in the application.

Q: Are NorComp 172 series connectors suitable replacements?

A: NorComp 172 series parts (172-025-212R011 and 172-025-212R021) are not suitable replacements. Both are obsolete products with 5A current ratings and -50°C to 100°C operating temperature ranges, which fall below the L177DFB25ST specifications. NorComp 172-E series parts (172-E25-213R001 and 172-E25-213R911) are active but still have insufficient current ratings and temperature ranges.

Q: What is the advantage of the Amphenol ICC Delta D series parts over the TE Connectivity AMPLIMITE parts?

A: The Delta D series parts (D25S24A4GL00LF, D25S24A4GX00LF, D25S24A4PL00LF, D25S24A4PX00LF) match the full electrical specifications of the L177DFB25ST, including 7.5A equivalent current capacity and -55°C to 125°C operating temperature. The AMPLIMITE parts (2-338315-2 and 6-338315-2) provide 6A current rating and -55°C to 105°C temperature range, which are reduced specifications.

Q: Does packaging type affect substitution compatibility?

A: Packaging type (Tray or Bulk) does not affect electrical or mechanical compatibility. It affects only handling, storage, and logistics. The L177DFB25ST is supplied in Tray packaging. Substitute parts may be supplied in different packaging formats without affecting connector performance.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts carry RoHS compliance certifications (either RoHS Compliant or ROHS3 Compliant). The L177DFB25ST is RoHS Compliant. Compliance status is maintained across all recommended substitutes.

Q: What does "Board Lock" feature mean?

A: Board Lock is a mechanical feature that provides additional retention between the connector and the mating component. Parts with Board Lock (2-338315-2, 6-338315-2, D25S24A4GL00LF, D25S24A4GX00LF, 172-E25-213R911) include locking mechanisms. The L177DFB25ST does not specify this feature. Board Lock presence does not prevent substitution but adds mechanical security in applications where vibration or mechanical stress is a concern.

Q: Can I use a part with a higher voltage rating than 300V?

A: Yes. Parts with voltage ratings equal to or exceeding 300V are compatible. All substitute parts either match the 300V specification or do not specify a voltage rating, which does not indicate incompatibility. Higher voltage ratings provide additional safety margin.

Q: What is the significance of contact finish thickness specifications?

A: Contact finish thickness (measured in microinches or micrometers) affects contact durability and signal integrity over the connector's operational life. The L177DFB25ST specifies 30.0µin (0.76µm) gold plating. Substitute parts with "Flash" gold plating have thinner coatings. Flash plating is acceptable for signal-level applications but may have reduced durability in high-cycle mating environments.

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