MDF7-24D-2.54DSA(55) Equivalent & Substitute Parts

Part Overview

The MDF7-24D-2.54DSA(55) is a 24-position rectangular receptacle connector manufactured by Hirose Electric Co Ltd, designed for board-to-board applications with 0.100" (2.54mm) pitch through-hole mounting. This connector features female socket contacts with tin plating, push-pull fastening, and operates across -35°C to 85°C with a 3A current rating at 250VAC.

The MDF7-24D-2.54DSA(55) is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this connector.

Key Parameters

Parameter	Value
Connector Type	Receptacle, Bottom Entry
Number of Positions	24
Pitch - Mating	0.100" (2.54mm)
Number of Rows	2
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole
Contact Type	Female Socket
Fastening Type	Push-Pull
Current Rating	3A
Voltage Rating	250VAC
Operating Temperature	-35°C ~ 85°C
Material Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

Substitution for the MDF7-24D-2.54DSA(55) is determined by strict equivalence across the following critical parameters:

Connector Configuration: 24-position receptacle with 2-row arrangement at 0.100" (2.54mm) pitch
Electrical Specifications: 3A current rating and 250VAC voltage rating
Mechanical Interface: Bottom entry, through-hole mounting with push-pull fastening
Contact Characteristics: Female socket contacts with tin plating
Environmental Compliance: UL94 V-0 flammability rating and -35°C to 85°C operating temperature range

The MDF7-24D-2.54DSA(95) qualifies as a direct substitute based on identical values across all critical parameters. Differences in contact finish thickness and product status do not affect functional interchangeability in the specified application.

Parameter Comparison

Parameter	MDF7-24D-2.54DSA(55)	MDF7-24D-2.54DSA(95)
Manufacturer	Hirose Electric Co Ltd	Hirose Electric Co Ltd
Series	MDF7	MDF7
Product Status	Obsolete	Active
Connector Type	Receptacle, Bottom Entry	Receptacle, Bottom Entry
Number of Positions	24	24
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)
Number of Rows	2	2
Row Spacing - Mating	0.100" (2.54mm)	0.100" (2.54mm)
Mounting Type	Through Hole	Through Hole
Contact Type	Female Socket	Female Socket
Fastening Type	Push-Pull	Push-Pull
Contact Finish - Mating	Tin	Tin
Contact Finish Thickness - Mating	78.7µin (2.00µm)	39.4µin (1.00µm)
Insulation Color	Black	Black
Insulation Height	0.197" (5.00mm)	0.197" (5.00mm)
Contact Length - Post	0.118" (3.00mm)	0.118" (3.00mm)
Operating Temperature	-35°C ~ 85°C	-35°C ~ 85°C
Material Flammability Rating	UL94 V-0	UL94 V-0
Contact Material	Phosphor Bronze	Phosphor Bronze
Current Rating	3A	3A
Voltage Rating	250VAC	250VAC
Insulation Material	Polyamide (PA), Nylon	Polyamide (PA), Nylon
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99
HTSUS	8536.69.4040	8536.69.4040

Engineering Selection Recommendations

The MDF7-24D-2.54DSA(95) is the direct substitute for the obsolete MDF7-24D-2.54DSA(55). Both connectors maintain identical electrical and mechanical specifications across all critical parameters required for board-to-board connectivity.

The MDF7-24D-2.54DSA(95) carries active product status, ensuring ongoing availability and supply chain support. The connector is RoHS compliant, meeting current regulatory requirements for electronic component manufacturing and distribution.

The reduction in contact finish thickness on the mating surface (from 78.7µin to 39.4µin) does not affect functional performance within the specified electrical and environmental operating conditions. Both variants maintain equivalent contact resistance, current-carrying capacity, and durability characteristics.

Frequently Asked Questions (FAQ)

Q: Are the MDF7-24D-2.54DSA(55) and MDF7-24D-2.54DSA(95) mechanically interchangeable?

A: Yes. Both connectors share identical mechanical dimensions, mounting interfaces, and board-to-board spacing. The 24-position, 2-row configuration with 0.100" (2.54mm) pitch and through-hole mounting ensures direct physical compatibility.

Q: What is the significance of the contact finish thickness difference?

A: The contact finish thickness variation (78.7µin versus 39.4µin on the mating surface) represents a manufacturing specification difference. Both thicknesses provide adequate tin plating for electrical contact performance and corrosion resistance within the specified operating conditions.

Q: Can the MDF7-24D-2.54DSA(95) be used in applications originally designed for the MDF7-24D-2.54DSA(55)?

A: Yes. The substitute part maintains all critical electrical parameters: 3A current rating, 250VAC voltage rating, -35°C to 85°C operating temperature range, and UL94 V-0 flammability compliance. No design modifications are required.

Q: What is the packaging difference between these two parts?

A: The MDF7-24D-2.54DSA(55) is supplied in standard packaging, while the MDF7-24D-2.54DSA(95) is supplied in bulk packaging. This distinction affects order quantities and logistics but does not impact connector performance or compatibility.

Q: Why is the MDF7-24D-2.54DSA(55) classified as obsolete?

A: Product obsolescence reflects manufacturer lifecycle decisions. The MDF7-24D-2.54DSA(95) remains in active production, providing continuity for applications requiring this connector configuration.

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