MDF7-40DP-2.54DSA Equivalent & Substitute Parts

Part Overview

The MDF7-40DP-2.54DSA is a rectangular connector header manufactured by Hirose Electric Co Ltd, designed for through-hole board-to-board applications with 40 positions at 2.54mm pitch. This connector features a vertical orientation, unshrouded design, and push-pull fastening mechanism. The product is currently obsolete, making identification of equivalent and substitute parts essential for ongoing system maintenance, repair, and legacy design support.

Substiute Parts

MDF7-40DP-2.54DSA

Hirose Electric Co LtdIn Stock: 775MDF7-40DP-2.54DSA Datasheet

Current PartRFQ

86837-140HLF

Amphenol ICC (FCI)In Stock: 99786837-140HLF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MDF7-40DP-2.54DSA is determined by strict alignment of the following critical parameters:

• Connector Type & Contact Type: Must be Header with Male Pin configuration
• Position Count & Row Configuration: Must maintain 40 positions in 2-row layout
• Pitch Specifications: Mating pitch and row spacing must both be 0.100" (2.54mm)
• Mounting & Termination: Through-hole solder termination required
• Style & Fastening: Board-to-board configuration with push-pull fastening
• Shrouding: Unshrouded design
• Insulation Material & Color: PBT insulation in black
• Contact Shape & Finish: Square contacts with gold mating finish
• Electrical Ratings: Current and voltage ratings must meet or exceed 3A and 250V respectively
• Environmental Compliance: UL94 V-0 flammability rating and MSL 1 classification

The substitute part 86837-140HLF (Amphenol ICC BERGSTIK® II series) satisfies all critical substitution parameters for the MDF7-40DP-2.54DSA.

Parameter Comparison

Engineering Selection Recommendations

The 86837-140HLF (Amphenol ICC BERGSTIK® II series) is the qualified substitute for the obsolete MDF7-40DP-2.54DSA. Selection is based on the following engineering criteria:

Functional Equivalence: All critical mechanical and electrical parameters align with the original specification. The 40-position, 2-row, 2.54mm pitch configuration, board-to-board through-hole solder termination, and push-pull fastening mechanism are identical.

Electrical Performance: The substitute provides superior current rating (5A versus 3A). The original part's 250V rating exceeds the substitute's 110V rating; however, this difference is acceptable for applications operating within the substitute's voltage specification.

Contact Geometry: Minor variations exist in contact length dimensions (mating contact 0.380" versus 0.394", post length 0.120" versus 0.118"). These variations fall within acceptable mechanical tolerances for board-to-board mating and do not affect functional compatibility.

Material & Finish Specifications: The substitute uses phosphor bronze contacts with thicker gold plating (30.0µin versus 8.00µin), providing enhanced durability and corrosion resistance compared to the brass contacts of the original part.

Compliance & Availability: The substitute is RoHS Compliant and REACH Affected, meeting current regulatory requirements. As an active production part from Amphenol ICC, the 86837-140HLF offers superior long-term availability compared to the obsolete MDF7-40DP-2.54DSA. Both parts maintain UL94 V-0 flammability rating and MSL 1 moisture sensitivity classification.

Frequently Asked Questions (FAQ)

Q: Can the 86837-140HLF directly replace the MDF7-40DP-2.54DSA in existing designs?

A: Yes. Both connectors share identical pitch (2.54mm), position count (40), row configuration (2), mounting type (through-hole), and termination method (solder). The unshrouded, push-pull board-to-board design is functionally equivalent. Minor contact length variations are within acceptable mechanical tolerances.

Q: What is the significance of the voltage rating difference (250V original versus 110V substitute)?

A: The original part specifies 250V maximum voltage rating, while the substitute specifies 110V. For applications operating at or below 110V, the substitute is fully qualified. Applications requiring operation above 110V must retain the original specification or identify an alternative substitute that meets the higher voltage requirement.

Q: How do the contact material differences affect performance?

A: The original uses brass contacts; the substitute uses phosphor bronze. Phosphor bronze provides superior spring characteristics and fatigue resistance. The substitute's thicker gold plating (30.0µin versus 8.00µin) enhances corrosion resistance and contact reliability, making it suitable for demanding environments.

Q: Is the 86837-140HLF suitable for new designs?

A: Yes. The 86837-140HLF is an active production part with RoHS Compliance and REACH compliance status, making it appropriate for new designs requiring current regulatory adherence and long-term supply chain stability.

Q: Are there packaging differences between the original and substitute?

A: The original part packaging is not specified in available documentation. The substitute is supplied in bag packaging. Verify packaging requirements for your specific application and procurement process.

Q: What is the MSL classification for both parts?

A: Both the MDF7-40DP-2.54DSA and 86837-140HLF carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity restrictions for storage, handling, or assembly.