L177DFB25SAJ4 D-Sub 25 Position Receptacle Equivalent & Substitute Parts

Part Overview

The L177DFB25SAJ4 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 production status with 940 pieces in stock inventory.

Equivalent and substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit alternative configurations. The substitute parts listed below maintain functional compatibility within the D-Sub 25 position receptacle category while accommodating variations in shell finish, contact material, and electrical ratings.

Substiute Parts

L177DFB25SAJ4

Amphenol ICC (Commercial Products)In Stock: 957L177DFB25SAJ4 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

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174-E25-211R241

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

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the L177DFB25SAJ4 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Connector Style: D-Sub
• 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

Allowable Variation Parameters:

• Shell Material and Finish (Steel with different plating options)
• Contact Finish Thickness (Gold plating variations)
• Contact Material (Copper Alloy or Brass)
• Current Rating (within acceptable operational limits)
• Backset Spacing (within mechanical tolerance)
• Operating Temperature Range (within or overlapping the primary part range)
• RoHS Compliance Status (both compliant and non-compliant variants listed)
• Product Status (Active or Obsolete)

The substitute parts 173-E25-213R001, 174-E25-211R001, 174-E25-211R141, and 174-E25-211R241 all satisfy the mandatory matching parameters and are therefore electrically and mechanically compatible with the L177DFB25SAJ4 within their respective operational specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: L177DFB25SAJ4 (Amphenol ICC)

The L177DFB25SAJ4 is the recommended primary choice. It maintains active product status, RoHS compliance, and the highest current rating (7.5A) among all listed options. The tin-plated steel shell and copper alloy contacts provide superior corrosion resistance and electrical performance. The 300V voltage rating and extended operating temperature range (-55°C to 125°C) support demanding applications.

Secondary Selection: 173-E25-213R001 (NorComp Inc.)

The 173-E25-213R001 is the preferred substitute when the primary part is unavailable. This part maintains active product status and ROHS3 compliance. It matches the operating temperature range of the primary part (-55°C to 125°C) and provides equivalent UL94 V-0 flammability rating. The nickel-plated steel shell offers adequate corrosion protection. The reduced current rating (5A) is acceptable for applications not requiring the full 7.5A capacity. This part lacks panel mount designation but retains through-hole right-angle mounting capability.

Tertiary Selections: 174-E25-211R001, 174-E25-211R141, 174-E25-211R241 (NorComp Inc.)

These three NorComp parts are classified as obsolete and carry RoHS non-compliance status. They are listed for reference only in legacy system applications or when existing inventory must be maintained. The reduced operating temperature range (-50°C to 100°C) and lower current rating (5A) limit their applicability to less demanding environments. The yellow chromate plating provides reduced corrosion resistance compared to tin or nickel plating. Parts 174-E25-211R141 and 174-E25-211R241 feature screwlock or standard screw flange configurations, which differ from the unthreaded housing of the primary part.

Compliance Considerations:

Applications requiring RoHS compliance must utilize either L177DFB25SAJ4 or 173-E25-213R001. The three 174-E25-211R variants do not meet current RoHS standards and are unsuitable for new designs or regulated applications.

Frequently Asked Questions (FAQ)

Q: Can the 173-E25-213R001 directly replace the L177DFB25SAJ4 in all applications?

A: The 173-E25-213R001 is electrically and mechanically compatible for most applications. However, the reduced current rating (5A versus 7.5A) must be verified against circuit requirements. The absence of panel mount designation in the 173-E25-213R001 specification requires confirmation that through-hole right-angle mounting satisfies mechanical installation requirements. Both parts maintain identical connector geometry (25 positions, 2 rows, DB/B shell size) and solder termination.

Q: What is the significance of the different shell finishes (tin, nickel, yellow chromate)?

A: Shell finish affects corrosion resistance and environmental durability. Tin plating (L177DFB25SAJ4) provides superior corrosion protection in harsh environments. Nickel plating (173-E25-213R001) offers good corrosion resistance and is suitable for general industrial applications. Yellow chromate plating (174-E25-211R variants) provides basic corrosion protection and is typical of legacy designs. Selection depends on environmental exposure and application longevity requirements.

Q: Why do the NorComp 174-E25-211R parts show obsolete status?

A: Obsolete status indicates these parts are no longer in active production. While inventory remains available, manufacturers no longer support new orders or design-ins. These parts are retained in this reference for legacy system maintenance only. New designs should utilize active parts: L177DFB25SAJ4 or 173-E25-213R001.

Q: Are there differences in contact material between the substitute parts?

A: Yes. The L177DFB25SAJ4 uses copper alloy contacts, the 173-E25-213R001 uses copper contacts, and the 174-E25-211R variants use brass contacts. All three materials are acceptable for signal-level D-Sub applications. Copper and copper alloy provide superior electrical conductivity. Brass offers adequate performance with enhanced mechanical durability. Contact finish (gold plating) is consistent across all parts.

Q: What is the impact of the different backset spacing values?

A: Backset spacing (the distance from the mating face to the solder cup) varies: L177DFB25SAJ4 (0.319"), 173-E25-213R001 (0.283"), and 174-E25-211R variants (0.370"). These differences affect PCB layout and mechanical clearance. Verify backset spacing compatibility with existing PCB designs before substitution. Incorrect backset spacing may result in improper mating alignment or solder joint stress.

Q: Is the 173-E25-213R001 suitable for applications requiring the full 300V rating?

A: The 173-E25-213R001 specification does not include a voltage rating parameter. Applications requiring confirmed 300V operation should utilize the L177DFB25SAJ4, which explicitly specifies this rating. For applications operating below 300V, the 173-E25-213R001 is acceptable provided all other electrical and mechanical parameters are satisfied.

Q: Can the 174-E25-211R141 or 174-E25-211R241 be used in new designs?

A: No. These parts carry obsolete status and RoHS non-compliance designation. Regulatory requirements and industry standards mandate RoHS compliance for new designs. These parts are documented for reference in legacy system maintenance and repair scenarios only. New designs must utilize L177DFB25SAJ4 or 173-E25-213R001.

Q: What is the difference between the 174-E25-211R141 and 174-E25-211R241 flange features?

A: The 174-E25-211R141 features a female screwlock (4-40) flange, while the 174-E25-211R241 features standard screws (4-40). Both differ from the L177DFB25SAJ4 unthreaded housing design. The screwlock variant provides positive mating security through threaded engagement. The standard screw variant uses conventional fastening. Neither configuration matches the primary part's unthreaded housing, requiring mechanical redesign if substitution is necessary.