L177DFB25SAM4B Equivalent & Substitute Parts

Part Overview

The L177DFB25SAM4B 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 1029 units in stock.

Substitute parts become necessary when the primary part reaches end-of-life status, experiences supply constraints, or when design requirements permit alternative configurations. The substitute parts listed maintain core electrical and mechanical compatibility while offering variations in shell finish, contact material, and mounting specifications.

Substiute Parts

L177DFB25SAM4B

Amphenol ICC (Commercial Products)In Stock: 1082L177DFB25SAM4B Datasheet

Current PartRFQ

173-E25-213R001

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

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174-E25-211R001

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

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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 L177DFB25SAM4B is determined by the following critical parameters:

Core Compatibility Parameters:

• Connector style (D-Sub)
• Connector type (Receptacle, Female Sockets)
• Number of positions (25)
• Number of rows (2)
• Shell size and layout (3 / DB, B)
• Termination method (Solder)
• Contact form (Machined)
• Material flammability rating (UL94 V-0)

Variable Parameters Permitting Substitution:

• Shell material and finish (Steel with different plating options)
• Contact finish thickness (Gold plating variations)
• Current rating (5A to 7.5A range)
• Backset spacing (0.283" to 0.590")
• Mounting configuration (Panel mount variations)
• Flange feature type (Unthreaded housing or screwlock options)
• Operating temperature range (-50°C to -55°C minimum; 100°C to 125°C maximum)
• RoHS compliance status
• Product status (Active or Obsolete)

The substitute parts 173-E25-213R001, 174-E25-211R001, 174-E25-211R141, and 174-E25-211R241 all maintain the core D-Sub 25-position receptacle configuration with solder termination and UL94 V-0 flammability rating, making them functionally equivalent for applications where the variable parameters fall within acceptable ranges.

Parameter Comparison

Engineering Selection Recommendations

L177DFB25SAM4B (Primary Part)

The L177DFB25SAM4B remains the preferred selection for new designs and applications requiring active product status. This part offers the highest current rating (7.5A), full RoHS compliance, and the widest operating temperature range (-55°C to 125°C). The tin-plated steel shell and 30.0µin gold contact finish provide robust environmental protection. The 300V voltage rating specification is explicitly defined. This part is currently in active production with adequate inventory.

173-E25-213R001 (Primary Substitute)

The 173-E25-213R001 is the recommended substitute when the L177DFB25SAM4B becomes unavailable. This part maintains active product status, ROHS3 compliance, and identical operating temperature range (-55°C to 125°C). The nickel-plated steel shell offers corrosion resistance comparable to tin plating. The primary limitation is the reduced current rating (5A versus 7.5A) and different backset spacing (0.283" versus 0.590"). This part is suitable for applications where the 5A current rating is acceptable and mounting geometry permits the reduced backset spacing. The part does not include panel mount mounting brackets.

174-E25-211R001, 174-E25-211R141, 174-E25-211R241 (Secondary Substitutes)

These three NorComp parts are classified as obsolete and carry RoHS non-compliance status. Selection of these parts is restricted to legacy system maintenance and repair applications where original part specifications must be matched. All three parts feature yellow chromate-plated steel shells, reduced current rating (5A), and narrower operating temperature range (-50°C to 100°C). The 174-E25-211R141 and 174-E25-211R241 include screwlock or standard screw flange features on the mating side, distinguishing them from the unthreaded housing configuration of the primary part. These parts should not be selected for new designs or systems requiring RoHS compliance.

Frequently Asked Questions (FAQ)

Q: Can the 173-E25-213R001 be used as a direct replacement for the L177DFB25SAM4B?

A: The 173-E25-213R001 is functionally equivalent for applications where the 5A current rating is acceptable. However, the backset spacing differs (0.283" versus 0.590"), which affects panel mounting geometry. The 173-E25-213R001 does not include panel mount mounting brackets. Verify that the reduced current rating and different backset spacing are compatible with the application requirements before substitution.

Q: What is the significance of the backset spacing difference?

A: Backset spacing defines the distance from the rear of the connector shell to the mounting surface. The L177DFB25SAM4B has a backset spacing of 0.590" (14.99mm), while the 173-E25-213R001 has 0.283" (7.20mm). This difference affects the depth of the connector when mounted on a panel. Applications with space constraints or specific panel cutout dimensions may not accommodate the different backset spacing without mechanical redesign.

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

A: Obsolete product status indicates that these parts are no longer in active production. NorComp has discontinued these models in favor of newer designs. While inventory may still be available from distributors, these parts should not be selected for new designs. Obsolete parts carry increased risk of supply discontinuation and may not receive technical support updates.

Q: What is the difference between RoHS Compliant and RoHS non-compliant parts?

A: RoHS (Restriction of Hazardous Substances) compliance indicates that the part meets European Union regulations restricting the use of specific hazardous materials including lead, cadmium, and mercury. The L177DFB25SAM4B and 173-E25-213R001 are RoHS compliant, while the 174-E25 series parts are RoHS non-compliant. Applications subject to RoHS regulations or customer requirements must use compliant parts. The 174-E25 series parts are restricted to legacy system maintenance where original specifications must be preserved.

Q: How does the shell material finish affect connector performance?

A: Shell material finish provides environmental protection and affects corrosion resistance. The L177DFB25SAM4B uses tin plating, the 173-E25-213R001 uses nickel plating, and the 174-E25 series use yellow chromate plating. Tin and nickel plating offer superior corrosion resistance compared to yellow chromate plating. Applications in corrosive environments or with extended service life requirements should prioritize tin or nickel-plated options.

Q: What is the impact of contact finish thickness on connector reliability?

A: Contact finish thickness affects the durability of the gold plating on the contact surfaces. The L177DFB25SAM4B specifies 30.0µin (0.76µm) gold thickness, while the substitute parts specify flash thickness (minimal plating). Thicker gold plating provides better protection against wear and corrosion during mating cycles. Applications requiring high cycle counts or extended service life benefit from the thicker gold plating of the L177DFB25SAM4B.

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

A: No. These parts carry obsolete product status and RoHS non-compliance. They are restricted to legacy system maintenance and repair applications where original part specifications must be matched. New designs must use active, RoHS-compliant parts such as the L177DFB25SAM4B or 173-E25-213R001.

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

A: Both parts are identical except for the flange feature. The 174-E25-211R141 includes a female screwlock (4-40) on the mating side, while the 174-E25-211R241 includes standard screws (4-40) on the mating side. The flange feature affects the mating connector interface and cable retention method. Selection between these parts depends on the specific mating connector configuration required by the application.

Q: Are there any temperature range limitations when substituting parts?

A: Yes. The L177DFB25SAM4B and 173-E25-213R001 support -55°C to 125°C operation, while the 174-E25 series parts support only -50°C to 100°C. Applications requiring operation below -50°C or above 100°C must use the L177DFB25SAM4B or 173-E25-213R001. The 174-E25 series parts are unsuitable for extreme temperature applications.