L77DB25SAJ3

Part Overview

The L77DB25SAJ3 is a 25-position D-Sub receptacle connector with female sockets, manufactured by Amphenol ICC (Commercial Products). This connector features right-angle through-hole solder termination and is currently in active product status. The need to identify substitute components arises from supply chain considerations, manufacturing transitions, and the availability of equivalent alternatives that maintain functional compatibility within specified electrical and mechanical parameters.

Substiute Parts

L77DB25SAJ3

Amphenol ICC (Commercial Products)In Stock: 784L77DB25SAJ3 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

Substitute parts for the L77DB25SAJ3 are selected based on strict electrical and mechanical compatibility criteria. The critical parameters that determine substitution eligibility are:

• Connector configuration: 25-position D-Sub receptacle with female sockets in 2-row configuration (Shell Size 3 / DB-B layout)
• Mounting type: Through-hole, right-angle mounting for PCB termination via solder
• Termination method: Solder-based connection
• Operating temperature range: Minimum -55°C to 125°C capability
• Current and voltage ratings: Electrical specifications that establish safe operating limits
• Contact material and finish: Determines signal integrity and environmental durability
• Shell material and plating: Affects mechanical durability and corrosion resistance

The identified substitutes include components from NorComp Inc. series 173-E and 174-E, which maintain the core D-Sub 25-position receptacle architecture and solder termination method. Variations exist in shell plating, contact finish thickness, backset spacing, current ratings, and compliance certifications; these differences establish specific application compatibility boundaries.

Parameter Comparison

Engineering Selection Recommendations

173-E25-213R001 (NorComp Inc.)

This substitute represents the most compatible alternative. The connector maintains the core 25-position D-Sub receptacle configuration with through-hole right-angle solder termination and UL94 V-0 flammability rating. The operating temperature range extends to 125°C and aligns fully with the L77DB25SAJ3 specification. The primary design differences are the nickel-plated steel shell finish (versus tin-plated) and copper contact material (versus brass). The current rating is specified at 5A compared to 7.5A on the primary part; this reduction in current capacity must be evaluated within the specific application circuit requirements. This part carries ROHS3 compliance certification, matching the regulatory alignment of the primary component. Product status is active, ensuring ongoing availability.

174-E25-211R001 (NorComp Inc.)

This variant maintains the 25-position D-Sub receptacle solder-terminated architecture with additional panel mount capability. The yellow chromate-plated steel shell provides corrosion resistance characteristic of aerospace and industrial applications. The flange feature is standard unthreaded housing, matching the primary part's mounting interface. Design limitations include a 5A current rating (versus 7.5A), an operating temperature maximum of 100°C (versus 125°C), and obsolete product status. RoHS non-compliance precludes use in regulatory environments requiring RoHS adherence. The backset spacing is 0.370 inches (9.40mm), which differs from the primary part specification of 0.319 inches (8.10mm); this dimension affects mounting bracket compatibility and PCB layout positioning.

174-E25-211R141 (NorComp Inc.)

This variant incorporates female screwlock mating connectors (4-40 thread), a structural feature absent on the primary part. This modification changes the connector's mating interface and is suitable only for applications requiring threaded screwlock coupling. The remaining electrical and mechanical characteristics match the 174-E25-211R001 variant: 5A current rating, 100°C maximum temperature, 9.40mm backset spacing, yellow chromate plating, and obsolete status with RoHS non-compliance. Mounting brackets are integrated into this configuration. This part is substitutable only in applications specifically designed to interface with female screwlock connectors.

174-E25-211R241 (NorComp Inc.)

This variant incorporates standard 4-40 mating screws rather than female screwlocks, creating a different mechanical interface from the primary part and the 174-E25-211R141 variant. The electrical and thermal performance characteristics replicate the 174-E25-211R001 specification: 5A current, 100°C maximum operating temperature, and identical shell plating. Mounting brackets are integrated. Obsolete status and RoHS non-compliance apply to this variant. This part is substitutable only in applications engineered for standard screw-based coupling.

Frequently Asked Questions (FAQ)

Q: Can the 173-E25-213R001 substitute directly for the L77DB25SAJ3 in any application?

The 173-E25-213R001 maintains functional D-Sub 25-position receptacle compatibility and supports the full -55°C to 125°C operating range. However, the 5A current rating versus the 7.5A specification of the primary part establishes a design constraint. Direct substitution is permissible only in applications where the circuit current draw does not exceed 5A continuous operation. The nickel versus tin shell plating and copper versus brass contact material represent secondary material variations that do not affect connector mating or basic electrical function.

Q: Why are the NorComp 174-E series parts listed as obsolete?

Product status indicates the manufacturer's commitment to production and support. Obsolete designation signifies that the manufacturer has discontinued active production and development support, though existing inventory may remain available. Obsolete parts carry increased supply risk and potential future unavailability. Selection should account for long-term sourcing requirements and production timeline constraints.

Q: What is the significance of the different backset spacings between the L77DB25SAJ3 and substitute parts?

Backset spacing defines the distance from the connector's mounting plane to the contact insertion point. The L77DB25SAJ3 specifies 0.319 inches (8.10mm), while the 174-E series parts specify 0.370 inches (9.40mm), and the 173-E25-213R001 specifies 0.283 inches (7.20mm). This dimension directly impacts PCB layout routing clearances, mounting bracket clearances, and mating connector alignment. Direct mechanical substitution without layout redesign is possible only when backset spacing remains compatible with existing circuit board design and mechanical assembly fixtures.

Q: What RoHS compliance implications exist for substitute selection?

The primary L77DB25SAJ3 is RoHS Compliant, meeting applicable restrictions on hazardous substances. The 173-E25-213R001 carries ROHS3 certification, satisfying equivalent compliance requirements. The 174-E series parts (174-E25-211R001, 174-E25-211R141, 174-E25-211R241) are explicitly RoHS non-compliant and cannot be substituted in applications or markets requiring RoHS adherence. Regulatory requirements, customer specifications, or market restrictions may mandate compliance-certified alternatives only.

Q: Are the flange feature differences between parts significant for mechanical compatibility?

Yes. The L77DB25SAJ3 incorporates unthreaded housing/shell flange. The 173-E25-213R001 maintains this identical interface. The 174-E25-211R141 includes female screwlock (4-40) mating features, and the 174-E25-211R241 includes standard 4-40 screw mounting. These structural variations define the mechanical coupling interface with mating connectors and mounting brackets. Substitution is viable only when the mechanical interface matches the application's connector mating design.

Q: What contact material differences exist between substitute parts?

The L77DB25SAJ3 employs brass contacts with 8.00µin gold plating. The 173-E25-213R001 uses copper contacts with flash gold plating. The 174-E series parts employ brass contacts with flash gold plating. Brass provides stronger mechanical durability and wear resistance compared to copper. Flash plating thickness is substantially thinner than the 8.00µin specification on the primary part, potentially reducing long-term contact reliability in high-cycle mating applications or corrosive environments. Contact material selection affects signal integrity, creep resistance, and connector service life.

Q: How should temperature rating differences influence substitute selection?

The L77DB25SAJ3 and 173-E25-213R001 both support -55°C to 125°C operation. The 174-E series parts limit operation to -50°C to 100°C maximum. Applications requiring full low-temperature performance to -55°C cannot use 174-E variants. Applications with upper thermal limits above 100°C require either the primary part or the 173-E25-213R001 substitute. Temperature rating affects component reliability in thermal cycling environments, outdoor installations, and high-power circuit applications.