MDF7-7S-2.54DSA Equivalent & Substitute Parts

Part Overview

The MDF7-7S-2.54DSA is a 7-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, solder termination, and push-pull fastening. The main part is classified as obsolete, which necessitates identification of active equivalent alternatives to ensure continued availability and supply chain reliability for new designs and production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	MDF7-7S-2.54DSA
Manufacturer	Hirose Electric Co Ltd
Category	Rectangular Connectors
Series	MDF7
Connector Type	Receptacle, Bottom Entry
Contact Type	Female Socket
Number of Positions	7
Pitch - Mating	0.100" (2.54mm)
Mounting Type	Through Hole
Termination	Solder
Current Rating	3A
Voltage Rating	250VAC
Operating Temperature	-35°C ~ 85°C
Material Flammability Rating	UL94 V-0
Product Status	Obsolete

Substitute Part Grouping Explanation

The substitute part MDF7-7S-2.54DSA(55) is classified as a direct equivalent based on the following critical parameters that determine substitution compatibility:

Connector Type & Configuration: Both parts are 7-position receptacle connectors with bottom entry design and identical 0.100" (2.54mm) mating pitch
Electrical Specifications: Matching current rating (3A) and voltage rating (250VAC)
Mechanical Interface: Identical through-hole solder termination, push-pull fastening, and insulation height (0.197")
Contact Specifications: Same female socket contact type, square contact shape, and phosphor bronze material
Environmental Ratings: Identical operating temperature range (-35°C ~ 85°C) and UL94 V-0 flammability rating
Series Designation: Both parts belong to the MDF7 series

The primary distinction is product status: the main part is obsolete while the substitute is active, with improved RoHS3 compliance and higher contact finish thickness specifications.

Parameter Comparison

Parameter	MDF7-7S-2.54DSA	MDF7-7S-2.54DSA(55)	Compatibility
Manufacturer Part Number	MDF7-7S-2.54DSA	MDF7-7S-2.54DSA(55)	Direct Equivalent
Product Status	Obsolete	Active	Substitute Available
Number of Positions	7	7	Identical
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	Identical
Connector Type	Receptacle, Bottom Entry	Receptacle, Bottom Entry	Identical
Contact Type	Female Socket	Female Socket	Identical
Mounting Type	Through Hole	Through Hole	Identical
Termination	Solder	Solder	Identical
Current Rating (Amps)	3A	3A	Identical
Voltage Rating	250VAC	250VAC	Identical
Operating Temperature	-35°C ~ 85°C	-35°C ~ 85°C	Identical
Material Flammability Rating	UL94 V-0	UL94 V-0	Identical
Insulation Material	Polyamide (PA), Nylon	Polyamide (PA), Nylon	Identical
Contact Material	Phosphor Bronze	Phosphor Bronze	Identical
Contact Finish - Mating	Tin	Tin	Identical
Contact Finish Thickness - Mating	39.4µin (1.00µm)	78.7µin (2.00µm)	Enhanced in Substitute
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Improved Compliance
Packaging	-	Bulk	Standard Packaging

Engineering Selection Recommendations

The MDF7-7S-2.54DSA(55) is the direct active equivalent for the obsolete MDF7-7S-2.54DSA. Selection of the substitute part is based on the following engineering criteria:

Product Status: The main part is obsolete, making the active MDF7-7S-2.54DSA(55) the appropriate choice for new designs and ongoing production
Regulatory Compliance: The substitute achieves ROHS3 compliance, whereas the main part is RoHS non-compliant, aligning with current regulatory requirements
Electrical & Mechanical Compatibility: All critical electrical parameters (current, voltage, temperature range) and mechanical specifications (pitch, mounting, termination) are identical, ensuring direct functional equivalence
Contact Durability: The substitute features increased contact finish thickness (78.7µin vs. 39.4µin), providing enhanced wear resistance and contact reliability
Supply Continuity: With 10,701 pieces in stock, the substitute ensures reliable supply availability compared to the obsolete main part

Frequently Asked Questions (FAQ)

Q: Can MDF7-7S-2.54DSA(55) be used as a direct replacement for MDF7-7S-2.54DSA?

A: Yes. Both connectors share identical electrical ratings (3A, 250VAC), mechanical specifications (7-position, 0.100" pitch, through-hole solder termination), and environmental operating parameters (-35°C ~ 85°C, UL94 V-0). The substitute is functionally equivalent and physically compatible.

Q: What is the difference between these two part numbers?

A: The primary differences are product status and compliance. MDF7-7S-2.54DSA is obsolete and RoHS non-compliant, while MDF7-7S-2.54DSA(55) is active and ROHS3 compliant. Additionally, the substitute features thicker tin plating on mating contacts (78.7µin vs. 39.4µin), improving contact durability.

Q: Does the increased contact finish thickness affect compatibility?

A: No. The increased tin plating thickness on MDF7-7S-2.54DSA(55) enhances contact reliability and wear resistance without affecting mechanical or electrical compatibility. The connector maintains the same mating pitch, contact geometry, and electrical performance.

Q: What packaging is available for the substitute part?

A: MDF7-7S-2.54DSA(55) is supplied in bulk packaging, suitable for production assembly and component procurement workflows.

Q: Are there any compliance advantages to using the substitute?

A: Yes. MDF7-7S-2.54DSA(55) is ROHS3 compliant, meeting current regulatory requirements for electronic components in many markets. The original part is RoHS non-compliant, which may restrict its use in regulated applications.

Q: Is the substitute part available in sufficient quantity?

A: Yes. MDF7-7S-2.54DSA(55) has 10,701 pieces in stock, providing reliable supply availability for production requirements.

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