L77DFB25SARM6 Equivalent & Substitute Parts

Part Overview

The L77DFB25SARM6 is a 25-position D-Sub receptacle connector manufactured by Amphenol ICC (Commercial Products). This female socket connector is configured as a right-angle panel mount through-hole device with solder termination, designed for signal applications requiring robust mechanical and electrical performance. The product is currently active in manufacturing and available in inventory (927 pieces new original in stock). Alternative equivalent parts are necessary when original part availability is constrained, packaging requirements differ, or when compatibility with related product series is required.

Substiute Parts

L77DFB25SARM6

Amphenol ICC (Commercial Products)In Stock: 968L77DFB25SARM6 Datasheet

Current PartRFQ

DB25S564CTLF

Amphenol ICC (FCI)In Stock: 1381DB25S564CTLF Datasheet

SimilarRFQ

DB25S564GTLF

Amphenol ICC (FCI)In Stock: 1318DB25S564GTLF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the L77DFB25SARM6 is determined by the following critical parameters:

Core Compatibility Requirements:

• Connector Type: Receptacle, Female Sockets
• Number of Positions: 25
• Shell Size: 3 (DB, B)
• Mounting Type: Right Angle with Through Hole capability
• Termination Method: Solder
• Flammability Rating: UL94 V-0
• RoHS Compliance: Required

Acceptable Variation Parameters:

• Contact Finish Thickness: May vary (20.0µin vs. Flash plating)
• Current Rating: Substitute parts rated at 5A per contact are acceptable where application requirements do not exceed 5A per contact
• Operating Temperature: Substitute parts rated to 125°C are acceptable where maximum operating temperature does not exceed 125°C
• Contact Material: Both Copper Alloy and Phosphor Bronze contacts are compatible
• Backset Spacing: Variation permitted within connector mechanical specification

The substitute parts DB25S564CTLF and DB25S564GTLF meet all core compatibility requirements and differ only in parameters that allow functional equivalence under appropriate application constraints.

Parameter Comparison

Engineering Selection Recommendations

DB25S564GTLF is the preferred substitute where the L77DFB25SARM6 is unavailable. This part maintains alignment with the original specification across all critical parameters: identical shell size, position count, mounting configuration, and termination method. Both parts carry active product status and RoHS compliance. The DB25S564GTLF features GXT™ contact finish technology and maintains the 300V voltage rating of the original part. Operating temperature is limited to 125°C (versus 155°C for the original), and current rating is specified as 5A per contact (versus 7.5A for the original). These differences are acceptable in applications where maximum operating temperature does not exceed 125°C and per-contact current requirements do not exceed 5A.

DB25S564CTLF is acceptable as an alternative substitute where inventory constraints require evaluation of additional options. This part meets core compatibility criteria and carries active product status with RoHS compliance. The DB25S564CTLF is available in tray packaging and differs from the original in contact material (Phosphor Bronze versus Copper Alloy) and in not having a specified voltage rating. Operating temperature and current rating limitations are identical to the DB25S564GTLF. Selection of this part requires confirmation that the application does not depend on the voltage rating specification.

Both substitute parts are manufactured by Amphenol ICC under the FCI division and share the same parent category classification (8536.69.4040) as the original part.

Frequently Asked Questions (FAQ)

Q: What are the primary differences between L77DFB25SARM6 and its substitutes?

A: The primary differences are current rating (7.5A original versus 5A per contact for substitutes), maximum operating temperature (155°C original versus 125°C for substitutes), and contact finish specifications. Both substitute parts maintain identical connector geometry, position count, shell size, and mounting configuration.

Q: Can DB25S564CTLF be used in place of L77DFB25SARM6?

A: Yes, DB25S564CTLF is compatible where the application does not exceed 125°C operating temperature and 5A per-contact current rating. The part lacks a specified voltage rating; if the application requires 300V rating confirmation, use DB25S564GTLF instead.

Q: Are there packaging differences between these parts?

A: Yes. The L77DFB25SARM6 packaging is not specified in standard documentation. DB25S564CTLF is supplied in tray packaging, while DB25S564GTLF is supplied in bulk packaging. Verify packaging compatibility with procurement and assembly processes.

Q: What does the GXT™ designation on DB25S564GTLF indicate?

A: GXT™ is a proprietary contact finish technology applied to the gold plating. Both substitute parts use gold contact finish; the GXT™ designation on DB25S564GTLF indicates a specific finish process variant compared to the standard gold finish on DB25S564CTLF.

Q: Can I use these substitutes interchangeably in the same assembly?

A: All three parts are mechanically and electrically compatible for direct substitution where the stated parameter limitations (temperature, current) are observed. They share identical shell size, position count, mounting type, and termination method. Verify that your application requirements fall within the specified operating limits of the selected substitute.

Q: What is the significance of the different contact materials (Copper Alloy vs. Phosphor Bronze)?

A: Both contact materials are acceptable for signal-level D-Sub applications. Copper Alloy (used in L77DFB25SARM6 and DB25S564GTLF) and Phosphor Bronze (used in DB25S564CTLF) provide equivalent electrical performance and durability for the specified current ratings.

Q: Is RoHS compliance maintained across all three parts?

A: Yes. All three parts are RoHS compliant. The original part and both substitutes meet equivalent regulatory compliance requirements.