L77DB25S1APN: Equivalent & Substitute Parts Reference

Part Overview

The L77DB25S1APN is a 25-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This right-angle, through-hole solder-terminated connector features female sockets in a DB/B shell size (Shell Size 3) and is classified as an active product. The connector is designed for signal applications with a current rating of 7.5A and operates across the temperature range of -55°C to 125°C.

Substitute parts become necessary when the L77DB25S1APN reaches end-of-life status, when inventory constraints occur, or when design requirements necessitate alternative contact finishes, shell materials, or mounting configurations. The substitute parts listed maintain functional equivalence through matching connector style, position count, termination method, and core electrical specifications.

Substiute Parts

L77DB25S1APN

Amphenol ICC (Commercial Products)In Stock: 1086L77DB25S1APN 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 L77DB25S1APN is determined by the following core 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
• Contact Form: Machined
• Material Flammability Rating: UL94 V-0

Allowable Variation Parameters:

• Shell Material and Finish (Steel Tin Plated, Steel Nickel Plated, Steel Yellow Chromate Plated)
• Contact Finish (Gold with varying thickness specifications)
• Contact Material (Brass or Copper)
• Backset Spacing (within connector geometry constraints)
• Mounting Type (Through Hole, Right Angle; Panel Mount variants acceptable)
• Flange Feature (Unthreaded housing or screwlock variants)
• Current Rating (5A to 7.5A range)
• Operating Temperature Range (minimum -50°C to -55°C; maximum 100°C to 125°C)
• RoHS Compliance Status (RoHS Compliant, ROHS3 Compliant, or RoHS non-compliant depending on application requirements)

The substitute parts 173-E25-213R001, 174-E25-211R001, 174-E25-211R141, and 174-E25-211R241 all satisfy the mandatory matching parameters and represent valid alternatives within the allowable variation range.

Parameter Comparison

Engineering Selection Recommendations

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

The 173-E25-213R001 is the preferred substitute for the L77DB25S1APN. This part maintains active product status and ROHS3 compliance, ensuring continued availability and regulatory alignment. The connector matches all mandatory parameters including D-Sub style, 25-position receptacle configuration, solder termination, and UL94 V-0 flammability rating. Operating temperature range (-55°C to 125°C) is identical to the main part. The primary differences are shell material finish (Nickel Plated versus Tin Plated), contact material (Copper versus Brass), and contact finish thickness (Flash versus 8.00µin). These variations remain within acceptable electrical and mechanical tolerances for signal-level D-Sub applications. Backset spacing of 0.283" (7.20mm) differs from the main part but is a standard connector geometry parameter. Current inventory of 1264 units supports immediate availability.

Secondary Selection: 174-E25-211R001 (NorComp Inc.)

The 174-E25-211R001 provides an alternative with panel mount capability in addition to through-hole mounting. This part is classified as obsolete, indicating potential future availability constraints. RoHS non-compliance status requires verification against application regulatory requirements. Operating temperature range is reduced to -50°C to 100°C, which may not satisfy designs requiring the full -55°C to 125°C specification. Current rating of 5A is lower than the main part's 7.5A specification. Backset spacing of 0.370" (9.40mm) and shell material finish (Yellow Chromate Plated) differ from the main part. Selection of this part is appropriate only when panel mount functionality is required and temperature/current specifications are compatible with application requirements.

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

Both 174-E25-211R141 and 174-E25-211R241 are obsolete products with RoHS non-compliance status. These parts differ from the main part in flange feature configuration (screwlock and standard screw variants versus unthreaded housing), operating temperature range (-50°C to 100°C), and current rating (5A). The 174-E25-211R141 includes female screwlock (4-40) mating side feature, while the 174-E25-211R241 includes standard screws (4-40). Both include mounting brackets. Selection of these parts is limited to legacy system maintenance or applications where screwlock/screw mating features are functionally required and where reduced temperature and current specifications are acceptable.

Frequently Asked Questions (FAQ)

Q: Can the 173-E25-213R001 directly replace the L77DB25S1APN in all applications?

A: The 173-E25-213R001 is functionally equivalent for signal-level D-Sub applications operating within the -55°C to 125°C temperature range and at current levels up to 5A. The primary differences are shell material finish (Nickel Plated), contact material (Copper), and contact finish thickness (Flash). These variations are acceptable for standard signal applications. However, applications with specific corrosion resistance requirements or contact finish specifications should evaluate the material differences. Backset spacing of 0.283" (7.20mm) differs from the main part's 0.406" (10.30mm); verify that PCB layout and mechanical mounting accommodate this spacing variation.

Q: What is the significance of the "Obsolete" product status for the NorComp substitute parts?

A: Obsolete product status indicates that the manufacturer has discontinued active production and support for these parts. While current inventory may be available through distributors, future procurement cannot be guaranteed. Designs incorporating obsolete parts face supply chain risk. The 173-E25-213R001 maintains active status and is the recommended long-term substitute. If design constraints require features specific to the obsolete NorComp parts (such as screwlock mating or panel mount configuration), evaluate the 174-E25-211R001, 174-E25-211R141, or 174-E25-211R241 only for near-term applications with defined end-of-life dates.

Q: How do the current rating differences affect part selection?

A: The L77DB25S1APN is rated for 7.5A, while all NorComp substitute parts are rated for 5A. Current rating represents the maximum continuous current the connector contacts can safely carry without exceeding temperature rise limits. Applications requiring current levels between 5A and 7.5A cannot use the NorComp substitutes without thermal analysis and potential design modification. Applications operating at 5A or below are unaffected by this rating difference. Verify actual application current requirements before selecting a substitute part with lower current rating.

Q: What are the implications of RoHS compliance status differences?

A: The L77DB25S1APN is RoHS Compliant, the 173-E25-213R001 is ROHS3 Compliant, and the 174-E25-211R001, 174-E25-211R141, and 174-E25-211R241 are RoHS non-compliant. RoHS (Restriction of Hazardous Substances) compliance is a regulatory requirement in many markets, particularly the European Union. Products destined for EU markets or applications subject to RoHS regulations must use compliant components. The 173-E25-213R001 satisfies ROHS3 requirements. The obsolete NorComp parts with non-compliant status are suitable only for legacy system maintenance or applications in markets without RoHS requirements.

Q: How do operating temperature range differences impact part selection?

A: The L77DB25S1APN operates from -55°C to 125°C. The 173-E25-213R001 matches this full range. The 174-E25-211R001, 174-E25-211R141, and 174-E25-211R241 operate from -50°C to 100°C, representing a reduced range. Applications requiring operation at temperatures below -50°C or above 100°C cannot use these NorComp parts. Applications operating within the -50°C to 100°C window are compatible with all substitute options. Verify application temperature extremes during design phase to ensure substitute part compatibility.

Q: What is the difference between shell material finishes (Tin Plated, Nickel Plated, Yellow Chromate Plated)?

A: Shell material finish affects corrosion resistance and environmental durability. Tin Plated (L77DB25S1APN) provides good solderability and moderate corrosion resistance. Nickel Plated (173-E25-213R001) offers enhanced corrosion resistance and is suitable for harsh environments. Yellow Chromate Plated (174-E25-211R001, 174-E25-211R141, 174-E25-211R241) provides cost-effective corrosion protection but is less durable than nickel plating. For applications in corrosive environments or with extended service life requirements, the Nickel Plated 173-E25-213R001 is preferred. For standard indoor applications, all finishes are acceptable.

Q: What does "Backset Spacing" mean and why does it vary between parts?

A: Backset spacing is the distance from the rear of the connector shell to the solder cup or contact termination point. The L77DB25S1APN has 0.406" (10.30mm) backset spacing, while the 173-E25-213R001 has 0.283" (7.20mm), and the 174-E25-211R001, 174-E25-211R141, and 174-E25-211R241 have 0.370" (9.40mm). This parameter affects PCB layout and mechanical mounting depth. When substituting parts, verify that the PCB footprint and mechanical clearances accommodate the different backset spacing. Incorrect backset spacing can result in improper connector seating or interference with adjacent components.

Q: Can the screwlock variants (174-E25-211R141) or standard screw variants (174-E25-211R241) be used as direct substitutes?

A: The 174-E25-211R141 and 174-E25-211R241 include mating-side screwlock or standard screw features, whereas the L77DB25S1APN has an unthreaded housing/shell flange. These screwlock and screw features provide mechanical locking between mating connectors. Direct substitution is possible only if the mating connector (plug) is compatible with the screwlock or screw configuration. If the existing design uses a standard D-Sub plug without screwlock capability, the 174-E25-211R141 and 174-E25-211R241 will not mate properly. These parts are suitable only for applications where screwlock or screw mating is functionally required and the mating plug is compatible.