L777DFB25P D-Sub Connector Equivalent & Substitute Parts

Part Overview

The L777DFB25P is a 25-position D-Sub plug connector manufactured by Amphenol ICC, designed for panel mount applications with male pins and solder cup termination. This connector is classified as Active product status and is RoHS compliant. Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit alternative manufacturers meeting equivalent electrical and mechanical specifications.

Substiute Parts

L777DFB25P

Amphenol ICC (Commercial Products)In Stock: 1122L777DFB25P Datasheet

Current PartRFQ

172-025-102R001

NorComp Inc.In Stock: 1405172-025-102R001 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the L777DFB25P is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Connector Style: D-Sub
• Connector Type: Plug, Male Pins
• Number of Positions: 25
• Number of Rows: 2
• Shell Size, Connector Layout: 3 (DB, B)
• Mounting Type: Panel Mount
• Termination: Solder Cup
• Flange Feature: Housing/Shell (Unthreaded)
• Contact Type: Signal
• Contact Form: Machined
• Contact Material: Brass

Acceptable Variation Parameters:

• Shell Material Finish: Steel, Tin Plated (fixed)
• Contact Finish: Gold (fixed)
• Flange Feature: Housing/Shell (Unthreaded) (fixed)
• Material Flammability Rating: UL94 V-0 (fixed)
• Color: May vary
• Dielectric Material: Thermoplastic or PBT variants acceptable
• Current Rating: Minimum 5A acceptable (L777DFB25P rated 7.5A)
• Voltage Rating: Minimum 300V acceptable
• Operating Temperature: Minimum -50°C to 100°C acceptable (L777DFB25P rated -55°C to 125°C)
• Contact Finish Thickness: Flash or 30.0µin acceptable
• Packaging: Bag or Tray acceptable

The substitute part 172-025-102R001 manufactured by NorComp Inc. meets all mandatory matching parameters and operates within acceptable variation ranges for this connector category.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: L777DFB25P

The L777DFB25P maintains Active product status with current manufacturing support from Amphenol ICC. This connector is RoHS compliant and provides the highest current rating (7.5A) and widest operating temperature range (-55°C to 125°C) among available options. Selection of the primary part is recommended for new designs and applications requiring maximum performance specifications.

Substitute Selection: 172-025-102R001

The 172-025-102R001 is classified as Obsolete product status. This connector is ROHS3 compliant and meets all mandatory mechanical and electrical parameters for D-Sub 25-position plug applications. The substitute part operates at reduced current rating (5A versus 7.5A) and narrower operating temperature range (-50°C to 100°C versus -55°C to 125°C). The substitute is suitable for applications where these reduced specifications are acceptable and supply of the primary part is unavailable. Existing designs currently utilizing the 172-025-102R001 may continue operation without modification.

Frequently Asked Questions (FAQ)

Q: Can the 172-025-102R001 be used as a direct replacement for the L777DFB25P?

A: The 172-025-102R001 is mechanically and electrically compatible for panel mount D-Sub 25-position plug applications. However, the substitute part operates at reduced current rating (5A versus 7.5A) and narrower operating temperature range (-50°C to 100°C versus -55°C to 125°C). Substitution is valid only when application requirements fall within these reduced specifications.

Q: What are the key differences between these connectors?

A: The primary differences are: (1) Current Rating: L777DFB25P rated 7.5A, 172-025-102R001 rated 5A; (2) Operating Temperature: L777DFB25P rated -55°C to 125°C, 172-025-102R001 rated -50°C to 100°C; (3) Dielectric Material: L777DFB25P uses Thermoplastic Glass Filled, 172-025-102R001 uses PBT Glass Filled; (4) Contact Finish Thickness: L777DFB25P 30.0µin, 172-025-102R001 Flash; (5) Product Status: L777DFB25P is Active, 172-025-102R001 is Obsolete; (6) Color: L777DFB25P is Black, 172-025-102R001 is Beige.

Q: Are both connectors RoHS compliant?

A: Yes. The L777DFB25P is RoHS compliant. The 172-025-102R001 is ROHS3 compliant. Both meet RoHS requirements for their respective regulatory frameworks.

Q: What is the significance of the Obsolete status for the 172-025-102R001?

A: Obsolete status indicates that NorComp Inc. no longer manufactures this part. Existing inventory may be available through authorized distributors, but new production is not available. The L777DFB25P, with Active status, is the recommended selection for new designs and applications requiring long-term supply assurance.

Q: Do these connectors have different packaging formats?

A: Yes. The L777DFB25P is packaged in Bag format, while the 172-025-102R001 is packaged in Tray format. Packaging differences do not affect electrical or mechanical compatibility but may impact handling, storage, and inventory management procedures.

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

A: The L777DFB25P specifies 30.0µin (0.76µm) gold contact finish thickness, while the 172-025-102R001 specifies Flash thickness. Both finishes provide gold plating for corrosion resistance and electrical conductivity. Flash thickness is thinner but acceptable for signal-level applications. The thicker finish on the L777DFB25P provides additional durability for high-cycle mating applications.

Q: Can I use the 172-025-102R001 in high-temperature applications?

A: The 172-025-102R001 is rated for operating temperatures up to 100°C maximum. Applications requiring operation above 100°C or below -50°C require the L777DFB25P, which is rated -55°C to 125°C.

Q: Are the dielectric materials functionally equivalent?

A: Both dielectric materials are glass-filled polymers with UL94 V-0 flammability rating. The L777DFB25P uses Thermoplastic Glass Filled material, while the 172-025-102R001 uses Polybutylene Terephthalate (PBT) Glass Filled material. Both materials meet the same flammability and electrical insulation requirements for this connector category.