MDF7-8S-2.54DSA Equivalent & Substitute Parts

Part Overview

The MDF7-8S-2.54DSA is an 8-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 a bottom entry configuration with female socket contacts, tin plating, and a push-pull fastening mechanism. 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	Hirose Electric Co Ltd
Series	MDF7
Connector Type	Receptacle, Bottom Entry
Number of Positions	8
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

Substitute Part Grouping Explanation

The substitute part MDF7-8S-2.54DSA(55) is classified as a direct equivalent based on the following critical parameters that determine substitution compatibility:

Same manufacturer (Hirose Electric Co Ltd) and base product series (MDF7)
Identical connector configuration: 8-position receptacle, bottom entry, board-to-board style
Matching mating pitch of 0.100" (2.54mm)
Identical contact type (female socket), mounting method (through hole), and termination (solder)
Equivalent electrical ratings: 3A current, 250VAC voltage
Matching operating temperature range: -35°C ~ 85°C
Same insulation material (Polyamide/Nylon) and flammability rating (UL94 V-0)

The primary distinction is product status: the main part is obsolete, while the substitute is active. The substitute also features improved RoHS3 compliance and increased contact finish thickness on both mating and post surfaces.

Parameter Comparison

Parameter	MDF7-8S-2.54DSA	MDF7-8S-2.54DSA(55)
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	8	8
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)
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)
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
Current Rating	3A	3A
Voltage Rating	250VAC	250VAC
Insulation Material	Polyamide (PA), Nylon	Polyamide (PA), Nylon
Contact Shape	Square	Square
Contact Material	Phosphor Bronze	Phosphor Bronze
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Packaging	-	Tray

Engineering Selection Recommendations

The MDF7-8S-2.54DSA(55) is the direct active equivalent for the obsolete MDF7-8S-2.54DSA. Selection of the substitute part is based on the following engineering criteria:

Product Status: The main part is obsolete, while the substitute maintains active production status, ensuring long-term availability and supply chain continuity.

Regulatory Compliance: The substitute achieves ROHS3 compliance, whereas the main part is RoHS non-compliant. This distinction is significant for applications subject to RoHS regulations.

Contact Durability: The substitute features increased contact finish thickness on both mating surfaces (78.7µin vs. 39.4µin) and post surfaces (78.7µin), providing enhanced wear resistance and extended service life.

Electrical and Mechanical Compatibility: All critical parameters remain identical, including connector configuration, pitch, contact type, mounting method, electrical ratings, and operating temperature range. The substitute maintains full mechanical and electrical interchangeability.

Frequently Asked Questions (FAQ)

Q: Can MDF7-8S-2.54DSA(55) be used as a direct replacement for MDF7-8S-2.54DSA?

A: Yes. Both parts share identical connector configuration, mating pitch (0.100"), contact type (female socket), mounting method (through hole), and electrical ratings (3A, 250VAC). The substitute is mechanically and electrically interchangeable.

Q: What is the significance of the "(55)" designation in the part number?

A: The "(55)" suffix indicates the packaging format (Tray) and represents an active production variant of the base MDF7-8S-2.54DSA design.

Q: Does the increased contact finish thickness affect compatibility?

A: No. The increased tin plating thickness (78.7µin vs. 39.4µin) on the substitute part enhances contact durability and wear resistance without affecting mechanical or electrical compatibility. This is a performance improvement.

Q: Are there RoHS compliance implications when switching from the main part to the substitute?

A: Yes. The main part is RoHS non-compliant, while the substitute is ROHS3 compliant. Applications subject to RoHS regulations must use the substitute part.

Q: What is the inventory status for each part?

A: The main part (MDF7-8S-2.54DSA) has 1138 pieces in stock as new original inventory. The substitute (MDF7-8S-2.54DSA(55)) has 710 pieces in stock as new original inventory in Tray packaging.

Q: Are the operating temperature ranges identical?

A: Yes. Both parts operate across the same temperature range of -35°C to 85°C, ensuring thermal compatibility in equivalent applications.

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