MDF7-11S-2.54DSA Equivalent & Substitute Parts

Part Overview

The MDF7-11S-2.54DSA is an 11-position rectangular receptacle connector manufactured by Hirose Electric Co Ltd, designed for board-to-board applications with bottom entry configuration and 0.100" (2.54mm) pitch. This connector features through-hole solder termination, tin-plated contacts, and operates across -35°C to 85°C. The main part is classified as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	MDF7-11S-2.54DSA
Manufacturer	Hirose Electric Co Ltd
Category	Rectangular Connectors
Connector Type	Receptacle, Bottom Entry
Number of Positions	11
Pitch - Mating	0.100" (2.54mm)
Contact Type	Female Socket
Mounting Type	Through Hole
Termination	Solder
Current Rating	3A
Voltage Rating	250VAC
Operating Temperature	-35°C ~ 85°C
Material Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

The MDF7-11S-2.54DSA(55) qualifies as a direct substitute based on the following critical parameters:

Connector Configuration: Both parts are 11-position receptacles with bottom entry design
Pitch Specification: Identical 0.100" (2.54mm) mating pitch
Contact System: Both feature female socket contacts with phosphor bronze material
Electrical Ratings: Matching 3A current rating and 250VAC voltage rating
Mechanical Interface: Identical through-hole solder termination and push-pull fastening
Environmental Specifications: Identical operating temperature range (-35°C ~ 85°C) and UL94 V-0 flammability rating
Insulation Properties: Both use polyamide (PA) nylon insulation with 0.197" (5.00mm) height

The primary distinction is product status: MDF7-11S-2.54DSA is obsolete, while MDF7-11S-2.54DSA(55) is active with improved RoHS compliance and higher inventory availability.

Parameter Comparison

Parameter	MDF7-11S-2.54DSA	MDF7-11S-2.54DSA(55)
Product Status	Obsolete	Active
Number of Positions	11	11
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)
Connector Type	Receptacle, Bottom Entry	Receptacle, Bottom Entry
Contact Type	Female Socket	Female Socket
Mounting Type	Through Hole	Through Hole
Termination	Solder	Solder
Contact Finish - Mating	Tin	Tin
Contact Finish Thickness - Mating	39.4µin (1.00µm)	78.7µin (2.00µm)
Current Rating	3A	3A
Voltage Rating	250VAC	250VAC
Operating Temperature	-35°C ~ 85°C	-35°C ~ 85°C
Material Flammability Rating	UL94 V-0	UL94 V-0
Insulation Material	Polyamide (PA), Nylon	Polyamide (PA), Nylon
RoHS Status	RoHS non-compliant	RoHS Compliant
Inventory Status	676 Pcs New Original In Stock	1310 Pcs New Original In Stock

Engineering Selection Recommendations

The MDF7-11S-2.54DSA(55) is the direct active equivalent for the obsolete MDF7-11S-2.54DSA. Selection criteria are based on the following factors:

Product Status: The original part is obsolete, making the active MDF7-11S-2.54DSA(55) the appropriate choice for new designs and ongoing production requirements.

Compliance: The substitute part achieves RoHS compliance, whereas the original is RoHS non-compliant. This distinction is significant for applications subject to regulatory requirements.

Contact Finish Durability: The substitute provides increased tin plating thickness on mating contacts (78.7µin versus 39.4µin), enhancing contact longevity and reliability in repeated mating cycles.

Electrical and Mechanical Compatibility: All critical parameters—pitch, position count, current rating, voltage rating, operating temperature, and flammability rating—are identical, ensuring direct functional interchangeability.

Availability: The substitute part maintains higher inventory levels (1310 pcs versus 676 pcs), supporting supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can MDF7-11S-2.54DSA(55) be used as a direct replacement for MDF7-11S-2.54DSA?

A: Yes. Both parts share identical connector configuration, pitch, contact system, electrical ratings, and operating specifications. The substitute is functionally and mechanically interchangeable.

Q: What is the significance of the "(55)" designation in MDF7-11S-2.54DSA(55)?

A: The "(55)" suffix indicates packaging variation (bulk packaging) and represents an active production variant with improved specifications, including RoHS compliance and enhanced contact finish thickness.

Q: Are there any differences in mating compatibility?

A: No. Both parts feature identical 0.100" (2.54mm) pitch and 11-position receptacle configuration, ensuring full compatibility with corresponding plug connectors.

Q: Why does the substitute have thicker tin plating on mating contacts?

A: The increased contact finish thickness (78.7µin versus 39.4µin) provides improved durability and contact resistance stability across repeated mating and unmating cycles, enhancing long-term reliability.

Q: Is the substitute suitable for applications requiring RoHS compliance?

A: Yes. MDF7-11S-2.54DSA(55) is RoHS compliant, whereas the original part is not. This makes the substitute the appropriate choice for applications subject to RoHS requirements.

Q: Are there any thermal or electrical performance differences?

A: No. Both parts maintain identical operating temperature range (-35°C ~ 85°C), current rating (3A), and voltage rating (250VAC).

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