MDF7-40DP-2.54DSA(55) Equivalent & Substitute Parts

Part Overview

The MDF7-40DP-2.54DSA(55) is a rectangular connector header manufactured by Hirose Electric Co Ltd, designed for through-hole board-to-board applications with 40 positions at 0.100" (2.54mm) pitch. This connector features male pins with solder termination and push-pull fastening, rated for 3A at 250V operation across -35°C to 85°C. The product is currently obsolete, making equivalent substitute parts necessary for ongoing system maintenance, repairs, and legacy design support.

Substiute Parts

MDF7-40DP-2.54DSA(55)

Hirose Electric Co LtdIn Stock: 684MDF7-40DP-2.54DSA(55) 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(55) 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
• Fastening & Style: Push-pull fastening with board-to-board connectivity
• Shrouding & Contact Shape: Unshrouded configuration with square contacts
• Insulation Properties: Black PBT insulation with UL94 V-0 flammability rating
• Electrical Ratings: Current and voltage ratings must meet or exceed 3A at 250V
• Environmental Range: Operating temperature compatibility across -35°C to 85°C

The substitute part 86837-140HLF (Amphenol ICC BERGSTIK® II series) satisfies all mandatory structural and electrical parameters, with enhanced specifications in contact material (phosphor bronze), contact finish (gold), and current rating (5A).

Parameter Comparison

Engineering Selection Recommendations

The 86837-140HLF serves as a direct functional substitute for the obsolete MDF7-40DP-2.54DSA(55). Selection is supported by the following engineering factors:

Product Status: The MDF7-40DP-2.54DSA(55) is obsolete, while the 86837-140HLF maintains active production status, ensuring long-term availability and supply chain continuity.

Compliance & Certifications: Both connectors meet UL94 V-0 flammability requirements and share identical ECCN (EAR99) and HTSUS classifications, maintaining regulatory alignment.

Electrical Performance: The 86837-140HLF exceeds the original specification with 5A current rating versus 3A, providing enhanced capacity for the same footprint. Voltage rating of 110V is suitable for applications within this specification range.

Contact Material & Finish: The substitute employs phosphor bronze contacts with gold plating, offering superior corrosion resistance and contact reliability compared to the brass/tin construction of the original part.

Dimensional Compatibility: Contact lengths and insulation heights are equivalent within manufacturing tolerances, ensuring mechanical interchangeability in board-to-board applications.

Environmental Specifications: Both connectors support MSL 1 (Unlimited) moisture sensitivity and identical operating temperature ranges, confirming environmental compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 86837-140HLF directly replace the MDF7-40DP-2.54DSA(55) in existing designs?

A: Yes. Both connectors share identical pitch (0.100" / 2.54mm), position count (40), row configuration (2), mounting type (through-hole), termination method (solder), and fastening mechanism (push-pull). Dimensional variations in contact length are within acceptable tolerances for board-to-board applications.

Q: What are the key differences between these two connectors?

A: The primary differences are contact material (brass vs. phosphor bronze), contact finish (tin vs. gold), current rating (3A vs. 5A), and product status (obsolete vs. active). The substitute offers enhanced electrical performance and corrosion resistance.

Q: Does the voltage rating difference (250V vs. 110V) affect substitution suitability?

A: No. The 86837-140HLF voltage rating of 110V is sufficient for applications designed for the original 250V specification. The substitute maintains adequate voltage isolation for standard board-to-board interconnect applications.

Q: Are there packaging differences between these connectors?

A: The MDF7-40DP-2.54DSA(55) packaging is not specified in available data. The 86837-140HLF is supplied in bag packaging. Verify packaging requirements for your procurement and assembly processes.

Q: What is the impact of the different contact finishes?

A: The gold finish on the 86837-140HLF provides superior oxidation resistance and lower contact resistance compared to the tin finish on the original part, resulting in improved long-term reliability and signal integrity.

Q: Are both connectors RoHS compliant?

A: RoHS compliance status is not specified for the MDF7-40DP-2.54DSA(55). The 86837-140HLF is RoHS Compliant and REACH Affected, meeting current environmental regulations.