L77DB25SA Equivalent & Substitute Parts

Part Overview

The L77DB25SA is a 25-position D-Sub receptacle connector with female sockets, manufactured by Amphenol ICC (Commercial Products). This connector features a right-angle solder termination, through-hole mounting, and is currently in active production status. Finding equivalent or substitute parts is necessary for design flexibility, supply chain continuity, long-term component availability, and board-level design requirements where alternative mounting configurations or compliance standards may apply.

Substiute Parts

L77DB25SA

Amphenol ICC (Commercial Products)In Stock: 981L77DB25SA 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 equivalency for the L77DB25SA is determined by the following core parameters:

• Connector Type: Receptacle, Female Sockets
• Number of Positions and Rows: 25 positions in 2-row configuration
• Shell Size, Connector Layout: 3 (DB, B)
• Mounting Type: Through Hole, Right Angle
• Termination: Solder
• Flange Feature: Housing/Shell (Unthreaded)

The substitute parts listed below maintain these critical parameters. Variations in shell material finish, contact finish thickness, current rating, backset spacing, operating temperature range, and RoHS compliance status do not preclude functional substitution but must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

L77DB25SA Primary Status: The main part L77DB25SA is in active production status with current availability of 939 pieces in inventory. This part is fully RoHS compliant and carries all required compliance certifications (UL94 V-0, RoHS Compliant, MSL 1).

173-E25-213R001 (NorComp) - Recommended for Active Design: This part is in active production status and is ROHS3 compliant. It maintains the core connector geometry (25-position, 2-row, DB/B shell size) with through-hole right-angle solder mounting. Current availability is 1264 pieces. Primary design consideration: Operating temperature range matches the main part (-55°C ~ 125°C). Backset spacing of 0.283" (7.20mm) differs from the main part; verify PCB footprint compatibility. Current rating is 5A versus the main part's 7.5A; confirm application current requirements.

174-E25-211R001, 174-E25-211R141, 174-E25-211R241 (NorComp) - Limited Recommendation: These parts are marked obsolete in product status and are RoHS non-compliant. Operating temperature range is reduced (-50°C ~ 100°C) compared to the main part. Current rating is 5A. These parts are suitable only for legacy system support or when new design compliance requirements are not applicable. The 174-E25-211R141 and 174-E25-211R241 include mating-side screwlock or standard screw features not present in the main part, and their backset spacing (0.370" / 9.40mm) differs significantly from L77DB25SA.

Frequently Asked Questions (FAQ)

Q: Can 173-E25-213R001 be used as a direct replacement for L77DB25SA? A: 173-E25-213R001 is functionally compatible for the core connector specifications (25-position receptacle, 2-row DB/B shell, right-angle solder termination). However, verify two parameters: (1) Backset spacing differs (7.20mm vs. 8.10mm), requiring PCB footprint validation; (2) Current rating is lower (5A vs. 7.5A), requiring application current review. If both parameters are acceptable for the design, this part is a valid substitute.

Q: Why are the NorComp 174-E25 series parts listed if they are obsolete? A: Obsolete parts are included for engineering reference in legacy system maintenance and design archaeology. For new designs, obsolete parts should not be selected. The 173-E25-213R001 NorComp alternative is the active-status substitute option.

Q: How does RoHS compliance affect part selection? A: The main part L77DB25SA is RoHS compliant. If the design is subject to RoHS regulations, 173-E25-213R001 (ROHS3 compliant) is the compatible choice. The 174-E25 series NorComp parts are RoHS non-compliant and are not suitable for designs with RoHS requirements.

Q: What is the impact of different shell material finishes? A: L77DB25SA uses steel with tin plating, while substitute parts use steel with nickel or yellow chromate plating. These finishes affect corrosion resistance and electrical contact characteristics. For applications in corrosive environments, verify that the alternative finish meets corrosion resistance requirements. All parts maintain gold-plated contacts for electrical performance.

Q: Are there current rating limitations with substitute parts? A: Yes. L77DB25SA is rated for 7.5A, while all NorComp substitutes are rated for 5A. If the design circuit current exceeds 5A, substitute parts are not acceptable. Verify application current specifications before selection.

Q: How does operating temperature range affect compatibility? A: L77DB25SA and 173-E25-213R001 both support -55°C ~ 125°C. The 174-E25 series parts support only -50°C ~ 100°C. For applications requiring the full -55°C ~ 125°C range, only L77DB25SA and 173-E25-213R001 are suitable.

Q: What does backset spacing mean, and why does it vary? A: Backset spacing is the distance from the mounting flange to the connector face. L77DB25SA specifies 0.319" (8.10mm), 173-E25-213R001 specifies 0.283" (7.20mm), and 174-E25 series parts specify 0.370" (9.40mm). This dimension affects PCB layout and mating connector alignment. Verify that the selected part's backset spacing accommodates the PCB design and mating connector requirements.