L77DFB25SAM4B D-Sub 25 Position Receptacle Equivalent & Substitute Parts

Part Overview

The L77DFB25SAM4B is a 25 position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This connector features female sockets, right-angle mounting, and solder termination for panel mount and through-hole applications. The part is currently active in production status with 1059 units in stock.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when design requirements change, or when alternative sourcing is required to meet project timelines and cost objectives. The substitute parts listed maintain functional compatibility through matching connector style, position count, mounting configuration, and termination method.

Substiute Parts

L77DFB25SAM4B

Amphenol ICC (Commercial Products)In Stock: 1148L77DFB25SAM4B 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 D-Sub 25 position receptacle connectors is determined by the following critical parameters:

Primary Compatibility Criteria:

• Connector style must be D-Sub
• Connector type must be receptacle with female sockets
• Position count must be 25
• Row configuration must be 2 rows
• Shell size and layout must be 3 (DB, B)
• Termination method must be solder
• Contact type must be signal
• Contact form must be machined

Secondary Compatibility Considerations:

• Mounting type (panel mount, through hole, right angle configurations)
• Flange feature design (unthreaded housing or screwlock variations)
• Shell material and finish specifications
• Contact finish and thickness
• Operating temperature range
• Current rating capacity
• Regulatory compliance status (RoHS, REACH)

All substitute parts listed meet the primary compatibility criteria. Variations in secondary parameters are documented to enable informed selection based on specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

L77DFB25SAM4B (Primary Part - Amphenol ICC)

The L77DFB25SAM4B is the recommended primary selection for new designs and applications requiring active production status. This part is RoHS compliant, offers the highest current rating (7.5A), widest operating temperature range (-55°C to 155°C), and highest voltage rating (300V). The tin-plated steel shell with 20.0µin gold contact finish provides superior corrosion resistance and contact durability. Active production status ensures long-term availability and supply chain stability.

173-E25-213R001 (NorComp - Active Status)

The 173-E25-213R001 is the preferred substitute for applications where the primary part is unavailable. This part maintains active production status and ROHS3 compliance. The mounting type differs slightly (through hole and right angle only, without panel mount option). The nickel-plated steel shell and flash gold contact finish are suitable for standard signal applications. Operating temperature range (-55°C to 125°C) and current rating (5A) are reduced compared to the primary part. This substitute is appropriate for applications not requiring the extended temperature range or higher current capacity of the primary part.

174-E25-211R001, 174-E25-211R141, 174-E25-211R241 (NorComp - Obsolete Status)

These three NorComp parts are classified as obsolete and are not recommended for new designs. All three parts are RoHS non-compliant and have restricted operating temperature ranges (-50°C to 100°C). Current rating is limited to 5A. The 174-E25-211R001 features unthreaded housing, while 174-E25-211R141 includes female screwlock (4-40) and 174-E25-211R241 includes standard screws (4-40) on the mating side. These parts are listed for reference only in legacy system support or when existing inventory must be utilized. Backset spacing differs from the primary part (0.370" versus 0.590"), which may affect mechanical fit in some applications.

Frequently Asked Questions (FAQ)

Q: Can the 173-E25-213R001 be used as a direct replacement for the L77DFB25SAM4B?

A: The 173-E25-213R001 is functionally compatible for signal applications requiring 25 position D-Sub receptacle connectivity. However, the mounting type differs: the 173-E25-213R001 supports through hole and right angle mounting only, while the L77DFB25SAM4B supports panel mount, through hole, and right angle. Verify that your application does not require panel mount capability. Additionally, the reduced current rating (5A versus 7.5A) and narrower operating temperature range (-55°C to 125°C versus -55°C to 155°C) must be evaluated against application requirements.

Q: What is the difference between the three NorComp 174-E25 parts?

A: All three 174-E25 parts (174-E25-211R001, 174-E25-211R141, 174-E25-211R241) share identical electrical specifications and mounting configurations. The primary difference is the flange feature: 174-E25-211R001 has unthreaded housing, 174-E25-211R141 includes female screwlock (4-40) on the mating side, and 174-E25-211R241 includes standard screws (4-40) on the mating side. Selection depends on whether mating-side fastening is required for your application. All three parts are obsolete and not recommended for new designs.

Q: Are the substitute parts RoHS compliant?

A: The 173-E25-213R001 is ROHS3 compliant and suitable for applications with RoHS requirements. The L77DFB25SAM4B is RoHS compliant. The three NorComp 174-E25 parts (174-E25-211R001, 174-E25-211R141, 174-E25-211R241) are RoHS non-compliant and cannot be used in applications requiring RoHS compliance.

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

A: Backset spacing is the distance from the rear of the connector shell to the solder cup termination points. The L77DFB25SAM4B has 0.590" (14.99mm) backset spacing, while the 174-E25 series parts have 0.370" (9.40mm) backset spacing. The 173-E25-213R001 has 0.283" (7.20mm) backset spacing. These differences affect the physical fit on printed circuit boards and panel layouts. Verify that your PCB design accommodates the backset spacing of any substitute part before implementation.

Q: Can I use the 174-E25 parts in new designs?

A: No. The 174-E25 parts are classified as obsolete and are not recommended for new designs. These parts are RoHS non-compliant, have restricted operating temperature ranges, and limited current ratings. Use the L77DFB25SAM4B for new designs. The 173-E25-213R001 is the only recommended substitute for new applications when the primary part is unavailable.

Q: What are the contact material differences and their implications?

A: The L77DFB25SAM4B uses copper alloy contacts, the 173-E25-213R001 uses copper contacts, and the 174-E25 series uses brass contacts. All three materials are suitable for signal applications with gold plating. Copper alloy provides enhanced corrosion resistance and is preferred for high-reliability applications. The contact finish thickness also varies: the L77DFB25SAM4B specifies 20.0µin (0.51µm), while substitute parts specify flash thickness. Flash thickness is thinner and may have reduced durability in high-cycle mating applications.

Q: What is the difference between the dielectric materials?

A: The L77DFB25SAM4B uses thermoplastic with glass filling, which provides enhanced mechanical strength and thermal stability. The substitute parts use polyamide (PA6T) nylon 6T, which is a standard engineering plastic for connector applications. Both materials meet UL94 V-0 flammability requirements. The glass-filled thermoplastic in the primary part offers superior dimensional stability and mechanical properties, particularly in extended temperature applications.

Q: Are there any packaging differences between these parts?

A: All parts listed are supplied in tray packaging. Inventory quantities vary: L77DFB25SAM4B (1059 pcs), 173-E25-213R001 (1264 pcs), 174-E25-211R001 (1166 pcs), 174-E25-211R141 (983 pcs), and 174-E25-211R241 (1023 pcs). Tray packaging is standard for D-Sub connectors and is suitable for automated assembly processes.