L77DBH25SAM4B

Part Overview

The L77DBH25SAM4B is a 25 Position D-Sub Receptacle connector manufactured by Amphenol ICC (Commercial Products). This through-hole, right-angle solder-terminated connector features female sockets with a board-side flange. The part is actively produced and RoHS compliant. Substitute parts become necessary when the primary part reaches end-of-life status, when specific design requirements demand alternative flange configurations, or when supply chain constraints require equivalent alternatives that maintain connector functionality and electrical performance.

Substiute Parts

L77DBH25SAM4B

Amphenol ICC (Commercial Products)In Stock: 658L77DBH25SAM4B 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

SimilarRFQ

174-E25-211R241

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the L77DBH25SAM4B are classified based on strict electrical and mechanical compatibility. All substitute parts maintain the following critical parameters that define the substitution scope:

• Connector Style: D-Sub
• Connector Type: Receptacle, Female Sockets
• Number of Positions: 25
• Number of Rows: 2
• Shell Size: 3 (DB, B)
• Mounting Type: Through Hole, Right Angle
• Termination: Solder
• Contact Form: Machined
• Material Flammability Rating: UL94 V-0

Variations in flange feature design, shell finish material, backset spacing, and compliance status create distinct substitute groupings. The primary substitute (173-E25-213R001) offers the closest electrical specifications with active product status. The NorComp 174-E series alternatives (174-E25-211R001, 174-E25-211R141, 174-E25-211R241) are classified as obsolete and present reduced current ratings and narrower operating temperature ranges, suitable only for legacy system replacements where exact specification matching is not critical.

Parameter Comparison

Engineering Selection Recommendations

The 173-E25-213R001 from NorComp Inc. is the primary equivalent substitute for new designs and ongoing applications. This part maintains active product status and ROHS3 compliance, ensuring long-term supply chain availability and regulatory alignment. However, the 173-E25-213R001 exhibits a reduced current rating of 5A compared to the 7.5A specification of the L77DBH25SAM4B; applications with current requirements exceeding 5A per contact must retain the primary part.

The 174-E25-211R001, 174-E25-211R141, and 174-E25-211R241 variants from NorComp Inc. are classified as obsolete and present multiple limiting factors: RoHS non-compliance, narrower operating temperature range (-50°C to 100°C), and reduced current ratings (5A). These parts are suitable only for legacy system repair and replacement scenarios where original specification compliance is waived. The distinction between these three obsolete variants lies in flange configuration: 174-E25-211R001 features unthreaded housing, while 174-E25-211R141 and 174-E25-211R241 provide female screwlock and standard screw flanges respectively on the mating side.

For applications requiring the 7.5A current rating and extended temperature range of the L77DBH25SAM4B, no direct equivalent exists within the provided substitute list. In such cases, the primary part L77DBH25SAM4B must be used.

Frequently Asked Questions (FAQ)

Q: Can the 173-E25-213R001 be used in all applications currently using the L77DBH25SAM4B? A: The 173-E25-213R001 is compatible with applications requiring 5A or less per contact. Applications designed for the 7.5A current rating of the L77DBH25SAM4B require retention of the original part specification.

Q: What are the key physical differences between the L77DBH25SAM4B and its substitutes? A: The backset spacing varies significantly across substitutes. The L77DBH25SAM4B specifies 0.590" (14.99mm), while 173-E25-213R001 specifies 0.283" (7.20mm), and all 174-E series parts specify 0.370" (9.40mm). Flange configuration also differs: the L77DBH25SAM4B features a board-side flange, whereas substitute parts employ housing-side or mating-side flanges.

Q: Are the obsolete 174-E series parts acceptable for new designs? A: The 174-E series parts are classified as obsolete products with RoHS non-compliance and reduced performance specifications. These parts are appropriate only for maintaining existing legacy systems, not for new development.

Q: What is the impact of different shell finishes on connector reliability? A: Shell finish differences (tin plated, nickel plated, yellow chromate plated) affect corrosion resistance and long-term environmental performance. The L77DBH25SAM4B tin plating and 173-E25-213R001 nickel plating both provide superior corrosion resistance compared to yellow chromate plating in the 174-E series.

Q: How does the RoHS compliance status affect part selection? A: RoHS compliance is a critical regulatory requirement for most commercial and consumer applications. The L77DBH25SAM4B and 173-E25-213R001 both meet current RoHS requirements, while the 174-E series parts do not, limiting their use to legacy systems or specialized applications with regulatory exemptions.