B5741-244-F-N-2 Equivalent & Substitute Parts

Part Overview

The B5741-244-F-N-2 is a 44-position receptacle connector from Harwin Inc.'s Datamate L-Tek series, designed for board-to-board or cable applications with 0.079" (2.00mm) pitch mating. This connector features through-hole solder termination, gold-plated contacts, and is rated for -55°C to 125°C operation with UL94 V-0 flammability compliance.

The B5741-244-F-N-2 carries an Obsolete product status. 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
Contact Type	Female Socket
Number of Positions	44
Pitch - Mating	0.079" (2.00mm)
Number of Rows	2
Row Spacing - Mating	0.079" (2.00mm)
Mounting Type	Through Hole
Termination	Solder
Operating Temperature	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0
Contact Material	Beryllium Copper
Contact Shape	Circular
Series	Datamate L-Tek

Substitute Part Grouping Explanation

Substitution eligibility for the B5741-244-F-N-2 is determined by strict alignment of the following critical parameters:

Connector type (Receptacle) and contact type (Female Socket)
Position count (44 positions)
Mating pitch (0.079" / 2.00mm)
Row configuration (2 rows with 0.079" row spacing)
Mounting method (Through Hole)
Termination type (Solder)
Operating temperature range (-55°C ~ 125°C minimum)
Flammability rating (UL94 V-0)
Contact material (Beryllium Copper)
Contact shape (Circular)

The M80-8504442 qualifies as a direct substitute based on these parameters. Both connectors are from the same Datamate L-Tek series and share identical mechanical and electrical mating characteristics. Variations in contact post length, contact finish materials, voltage rating, and insulation material do not preclude substitution when the mating interface and core functional requirements remain unchanged.

Parameter Comparison

Parameter	B5741-244-F-N-2	M80-8504442
Manufacturer	Harwin Inc.	Harwin Inc.
Series	Datamate L-Tek	Datamate L-Tek
Connector Type	Receptacle	Receptacle
Contact Type	Female Socket	Female Socket
Number of Positions	44	44
Pitch - Mating	0.079" (2.00mm)	0.079" (2.00mm)
Number of Rows	2	2
Row Spacing - Mating	0.079" (2.00mm)	0.079" (2.00mm)
Mounting Type	Through Hole	Through Hole
Termination	Solder	Solder
Fastening Type	Locking Ramp	Locking Ramp
Contact Finish - Mating	Gold	Gold
Contact Finish Thickness - Mating	12.0µin (0.30µm)	12.0µin (0.30µm)
Insulation Color	Black	Black
Insulation Height	0.202" (5.14mm)	0.202" (5.14mm)
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0	UL94 V-0
Contact Shape	Circular	Circular
Contact Material	Beryllium Copper	Beryllium Copper
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The M80-8504442 is the qualified substitute for the B5741-244-F-N-2. Selection of this substitute is supported by the following factors:

Product Status: The B5741-244-F-N-2 is classified as Obsolete, while the M80-8504442 maintains Active status. This ensures continued availability and manufacturer support for the substitute part.

Compliance & Certifications: Both connectors meet UL94 V-0 flammability requirements and operate across the identical temperature range (-55°C ~ 125°C). The M80-8504442 achieves ROHS3 compliance, whereas the B5741-244-F-N-2 is RoHS non-compliant. For applications subject to RoHS regulations, the M80-8504442 provides regulatory alignment.

Mating Interface Compatibility: Both connectors share identical mating characteristics—44 positions, 0.079" pitch, 2-row configuration with 0.079" row spacing, and circular beryllium copper contacts with gold-plated mating surfaces. This ensures mechanical and electrical compatibility with existing mating connectors.

Functional Equivalence: The core electrical and mechanical parameters that define connector interchangeability are identical between both parts. Differences in contact post length (0.051" vs. 0.118"), contact finish material (Gold vs. Tin), voltage rating (120V vs. 800V), and insulation material composition do not affect mating interface performance when the design accommodates the substitute's post length specification.

Frequently Asked Questions (FAQ)

Q: Can the M80-8504442 directly replace the B5741-244-F-N-2 in existing designs?

A: Yes, the M80-8504442 is mechanically and electrically compatible at the mating interface. Both connectors feature identical 44-position, 0.079" pitch configurations with 2-row layouts. Verify that your PCB layout accommodates the M80-8504442's contact post length of 0.118" (3.00mm), compared to the original 0.051" (1.30mm).

Q: What is the primary difference between these two connectors?

A: The primary differences are product status and compliance. The B5741-244-F-N-2 is Obsolete and RoHS non-compliant, while the M80-8504442 is Active and ROHS3 compliant. Additionally, the M80-8504442 features a longer contact post (0.118" vs. 0.051") and tin-plated posts instead of gold.

Q: Are there packaging differences between these parts?

A: The B5741-244-F-N-2 packaging specification is not provided. The M80-8504442 is supplied in Tube packaging.

Q: Does the voltage rating difference (120V vs. 800V) affect substitution?

A: The M80-8504442's higher voltage rating (800V) does not preclude substitution. A higher voltage rating indicates greater electrical capability and does not create incompatibility with designs rated for 120V operation.

Q: What should be verified before implementing the M80-8504442 as a substitute?

A: Confirm that your PCB design accommodates the M80-8504442's contact post length of 0.118" (3.00mm). Verify that the mating connector is compatible with the Datamate L-Tek series receptacle interface. If RoHS compliance is a design requirement, the M80-8504442 satisfies this requirement, whereas the original part does not.

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