L77DFB25SAJ4 D-Sub 25 Position Receptacle Equivalent & Substitute Parts

Part Overview

The L77DFB25SAJ4 is a 25 Position D-Sub Receptacle connector manufactured by Amphenol ICC (Commercial Products). This female sockets connector features right-angle solder termination and panel mount through-hole mounting. The part is currently Active in product status with 1154 pieces in stock inventory.

D-Sub connectors of this configuration are essential in applications requiring standardized 25-position signal distribution with robust mechanical and electrical performance. Equivalent and substitute parts become necessary when original inventory is unavailable, when design revisions require alternative specifications, or when supply chain optimization is required.

Substiute Parts

L77DFB25SAJ4

Amphenol ICC (Commercial Products)In Stock: 1168L77DFB25SAJ4 Datasheet

Current PartRFQ

173-E25-213R001

NorComp Inc.In Stock: 1275173-E25-213R001 Datasheet

SimilarRFQ

174-E25-211R001

NorComp Inc.In Stock: 1217174-E25-211R001 Datasheet

SimilarRFQ

174-E25-211R141

NorComp Inc.In Stock: 1041174-E25-211R141 Datasheet

SimilarRFQ

174-E25-211R241

NorComp Inc.In Stock: 1127174-E25-211R241 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the L77DFB25SAJ4 is determined by strict alignment of 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
• Contact Type: Signal
• Flange Feature: Housing/Shell (Unthreaded)
• Material Flammability Rating: UL94 V-0

Allowable Variation Parameters:

• Mounting Type: Panel Mount, Through Hole, Right Angle (all variants acceptable)
• Shell Material, Finish: Steel with various plating options (Tin Plated, Nickel Plated, Yellow Chromate Plated)
• Contact Finish: Gold (Flash or 20.0µin thickness acceptable)
• Current Rating: 5A to 7.5A range
• Voltage Rating: 300V or unspecified
• Operating Temperature: -55°C to -50°C minimum; 100°C to 125°C maximum
• RoHS Status: RoHS Compliant or ROHS3 Compliant acceptable; RoHS non-compliant parts listed for reference only
• Backset Spacing: 0.283" to 0.370" acceptable range

The substitute parts listed below meet these criteria and are therefore electrically and mechanically compatible with the L77DFB25SAJ4 for direct substitution in applications where the specified parameter tolerances are acceptable.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute (Recommended for New Designs):

The 173-E25-213R001 (NorComp Inc., Series 173-E, M Series) is the preferred substitute for the L77DFB25SAJ4. This part maintains Active product status, is ROHS3 Compliant, and provides full electrical and mechanical compatibility. The operating temperature range (-55°C ~ 125°C) matches the original specification. Inventory availability is adequate at 1264 pieces. The primary design difference is the absence of Panel Mount designation in the mounting type specification; however, the connector maintains Through Hole, Right Angle configuration suitable for panel applications.

Alternative Substitutes (Conditional Use):

The 174-E25-211R001, 174-E25-211R141, and 174-E25-211R241 (all NorComp Inc., Series 174-E, M Series) are electrically compatible but carry Obsolete product status and RoHS non-compliant certification. These parts are listed for reference in legacy system support or where RoHS compliance is not a design requirement. The operating temperature range is reduced to -50°C ~ 100°C, and current rating is 5A versus the original 7.5A specification. The 174-E series parts feature Yellow Chromate Plated shell finish and varying flange configurations (Female Screwlock or Standard Screws on mating side).

Compliance Considerations:

For applications requiring RoHS compliance, only the L77DFB25SAJ4 (RoHS Compliant) or 173-E25-213R001 (ROHS3 Compliant) are acceptable. The 174-E series substitutes are not suitable for RoHS-regulated applications.

Current Rating Derating:

Applications operating at or near 7.5A should use the L77DFB25SAJ4 or verify that 5A rating is acceptable for the 174-E series substitutes. The 173-E25-213R001 does not specify current rating; engineering review is required for high-current applications.

Temperature Range Derating:

Applications requiring operation below -50°C or above 100°C must use the L77DFB25SAJ4 or 173-E25-213R001, both rated to -55°C ~ 125°C.

Frequently Asked Questions (FAQ)

Q: Can the 173-E25-213R001 be used as a direct replacement for the L77DFB25SAJ4?

A: Yes. The 173-E25-213R001 meets all mandatory matching parameters: 25-position receptacle, female sockets, 2-row configuration, Shell Size 3 (DB, B), solder termination, signal contact type, unthreaded housing, and UL94 V-0 flammability rating. Operating temperature range, RoHS compliance status, and inventory availability are equivalent or superior. The primary difference is the absence of explicit Panel Mount designation; however, the Through Hole, Right Angle configuration is suitable for panel mounting applications.

Q: What are the key differences between the Amphenol ICC L77DFB25SAJ4 and NorComp 174-E series parts?

A: The 174-E series (174-E25-211R001, 174-E25-211R141, 174-E25-211R241) differ in the following specifications: (1) Product Status is Obsolete versus Active; (2) RoHS Status is non-compliant versus compliant; (3) Operating Temperature range is -50°C ~ 100°C versus -55°C ~ 125°C; (4) Current Rating is 5A versus 7.5A; (5) Shell finish is Yellow Chromate Plated versus Tin Plated; (6) Backset Spacing is 0.370" versus 0.319"; (7) Flange features vary (Female Screwlock or Standard Screws on mating side versus unthreaded housing). These differences may impact suitability for specific applications.

Q: Are there differences in the flange features between substitute parts?

A: Yes. The L77DFB25SAJ4 features Housing/Shell (Unthreaded) flange. The 173-E25-213R001 also features Housing/Shell (Unthreaded) flange. The 174-E25-211R141 features Mating Side, Female Screwlock (4-40) flange. The 174-E25-211R241 features Mating Side, Standard Screws (4-40) flange. These differences affect mating connector compatibility and mechanical assembly methods. Verify mating connector specifications before substitution.

Q: What is the significance of backset spacing differences?

A: Backset spacing (0.319" for L77DFB25SAJ4, 0.283" for 173-E25-213R001, 0.370" for 174-E series) defines the distance from the rear of the connector shell to the solder cup termination points. This parameter affects PCB layout, panel cutout dimensions, and cable routing. Verify PCB design compatibility before substituting parts with different backset spacing values.

Q: Can the 174-E series parts be used in new designs?

A: The 174-E series parts carry Obsolete product status and RoHS non-compliant certification. These parts are not recommended for new designs. Use the L77DFB25SAJ4 (Active, RoHS Compliant) or 173-E25-213R001 (Active, ROHS3 Compliant) for new product development.

Q: What is the difference between RoHS Compliant and ROHS3 Compliant?

A: Both designations indicate compliance with Restriction of Hazardous Substances regulations. RoHS Compliant refers to the original RoHS Directive (2002/95/EC). ROHS3 Compliant refers to the recast RoHS Directive (2011/65/EU). Both are acceptable for applications requiring RoHS compliance; ROHS3 represents the current regulatory standard.

Q: Are there contact material differences between substitute parts?

A: Yes. The L77DFB25SAJ4 uses Copper Alloy contacts. The 173-E25-213R001 uses Copper contacts. The 174-E series parts use Brass contacts. All three materials are acceptable for signal-level applications; however, contact material affects electrical conductivity, corrosion resistance, and cost. Verify material compatibility with application requirements.

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

A: The L77DFB25SAJ4 specifies Gold contact finish at 20.0µin (0.51µm) thickness. The substitute parts specify Flash thickness, which is a thin, unspecified gold plating. Flash plating provides corrosion protection and contact reliability for signal applications but may not be suitable for high-reliability or harsh environment applications requiring thicker gold plating. Verify contact finish requirements for critical applications.

Q: Is the 173-E25-213R001 available in adequate inventory?

A: Yes. The 173-E25-213R001 has 1264 pieces in stock inventory, exceeding the L77DFB25SAJ4 inventory of 1154 pieces. Inventory availability is adequate for both immediate and planned procurement.