MDF7-18S-2.54DSA(55) Equivalent & Substitute Parts

Part Overview

The MDF7-18S-2.54DSA(55) is an 18-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 tin-plated female socket contacts rated for 3A at 250VAC operation across -35°C to 85°C temperature range.

The MDF7-18S-2.54DSA(55) is classified as obsolete. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for applications currently utilizing this connector.

Key Parameters

Parameter	Value
Connector Type	Receptacle, Bottom Entry
Number of Positions	18
Pitch - Mating	0.100" (2.54mm)
Contact Type	Female Socket
Mounting Type	Through Hole
Current Rating	3A
Voltage Rating	250VAC
Operating Temperature	-35°C ~ 85°C
Material Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

Substitution eligibility for the MDF7-18S-2.54DSA(55) is determined by strict equivalence across the following critical parameters:

Connector Type & Configuration: Receptacle, bottom-entry design
Position Count & Pitch: 18 positions at 0.100" (2.54mm) mating pitch
Contact Characteristics: Female socket contacts with tin plating
Electrical Ratings: 3A current capacity and 250VAC voltage rating
Mechanical Interface: Through-hole solder termination with push-pull fastening
Environmental Compliance: UL94 V-0 flammability rating and -35°C to 85°C operating range

The MDF7-18S-2.54DSA(95) meets all substitution criteria as an active-status equivalent within the MDF7 series.

Parameter Comparison

Parameter	MDF7-18S-2.54DSA(55)	MDF7-18S-2.54DSA(95)	Compatibility
Manufacturer	Hirose Electric Co Ltd	Hirose Electric Co., Ltd.	Same
Series	MDF7	MDF7	Same
Connector Type	Receptacle, Bottom Entry	Receptacle, Bottom Entry	Same
Number of Positions	18	18	Same
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	Same
Contact Type	Female Socket	Female Socket	Same
Mounting Type	Through Hole	Through Hole	Same
Termination	Solder	Solder	Same
Fastening Type	Push-Pull	Push-Pull	Same
Contact Finish - Mating	Tin	Tin	Same
Contact Finish Thickness - Mating	78.7µin (2.00µm)	39.4µin (1.00µm)	Functionally Equivalent
Insulation Color	Black	Black	Same
Insulation Height	0.197" (5.00mm)	0.197" (5.00mm)	Same
Contact Length - Post	0.118" (3.00mm)	0.118" (3.00mm)	Same
Operating Temperature	-35°C ~ 85°C	-35°C ~ 85°C	Same
Material Flammability Rating	UL94 V-0	UL94 V-0	Same
Current Rating (Amps)	3A	3A	Same
Voltage Rating	250VAC	250VAC	Same
Insulation Material	Polyamide (PA), Nylon	Polyamide (PA), Nylon	Same
Contact Shape	Square	Square	Same
Contact Material	Phosphor Bronze	Phosphor Bronze	Same
Product Status	Obsolete	Active	Substitute is Active
RoHS Status	Not specified	RoHS Compliant	Substitute meets RoHS
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Same

Engineering Selection Recommendations

The MDF7-18S-2.54DSA(95) is the direct substitute for the obsolete MDF7-18S-2.54DSA(55). Both connectors share identical mechanical and electrical specifications within the MDF7 series, ensuring pin-for-pin compatibility and functional interchangeability in board-to-board applications.

The MDF7-18S-2.54DSA(95) offers the advantage of active product status, ensuring continued availability and supply chain support. Additionally, the substitute part carries RoHS compliance certification, meeting current regulatory requirements for electronic component procurement.

The minor difference in mating contact finish thickness (39.4µin versus 78.7µin) does not affect electrical performance or mechanical interface compatibility, as both finishes meet the same tin-plating standards for this connector category.

Frequently Asked Questions (FAQ)

Q: Can the MDF7-18S-2.54DSA(95) be used as a direct replacement for MDF7-18S-2.54DSA(55)?

A: Yes. Both connectors are 18-position receptacles with identical 0.100" (2.54mm) pitch, through-hole mounting, and electrical ratings (3A, 250VAC). They are mechanically and electrically interchangeable.

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

A: The primary differences are product status and compliance certification. The MDF7-18S-2.54DSA(55) is obsolete, while the MDF7-18S-2.54DSA(95) is active and RoHS compliant. The mating contact finish thickness differs slightly (78.7µin versus 39.4µin), but both meet tin-plating specifications for this connector series.

Q: Are there packaging differences between these parts?

A: The MDF7-18S-2.54DSA(55) packaging is not specified in available documentation. The MDF7-18S-2.54DSA(95) is supplied in bulk packaging. Confirm packaging requirements with your procurement department.

Q: Does the substitute part meet current regulatory standards?

A: Yes. The MDF7-18S-2.54DSA(95) is RoHS compliant and maintains the UL94 V-0 flammability rating required for board-to-board connector applications.

Q: What is the operating temperature range for both connectors?

A: Both the MDF7-18S-2.54DSA(55) and MDF7-18S-2.54DSA(95) operate across -35°C to 85°C, ensuring compatibility in standard industrial and commercial temperature environments.

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