B5741-103-F-N-2 Equivalent & Substitute Parts

Part Overview

The B5741-103-F-N-2 is a 3-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 gold-plated contacts, through-hole solder termination, and a locking ramp fastening mechanism. The part is currently obsolete, making identification of active equivalent substitutes essential for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	B5741-103-F-N-2
Manufacturer	Harwin Inc.
Category	Rectangular Connectors
Series	Datamate L-Tek
Connector Type	Receptacle
Contact Type	Female Socket
Number of Positions	3
Pitch - Mating	0.079" (2.00mm)
Mounting Type	Through Hole
Termination	Solder
Fastening Type	Locking Ramp
Operating Temperature	-55°C ~ 125°C
Product Status	Obsolete

Substitute Part Grouping Explanation

The substitute part M80-8400342 qualifies as a direct equivalent based on the following critical parameters that determine substitutability:

Matching Parameters:

Connector type: Receptacle with female socket contacts
Number of positions: 3
Pitch - mating: 0.079" (2.00mm)
Mounting type: Through hole
Termination: Solder
Fastening type: Locking ramp
Series: Datamate L-Tek
Operating temperature range: -55°C ~ 125°C
Contact shape: Circular
Contact material: Beryllium copper
Insulation color: Black
Material flammability rating: UL94 V-0

Functional Compatibility: M80-8400342 maintains the same mating interface, pin count, and pitch geometry, ensuring mechanical and electrical compatibility with existing mating connectors and PCB layouts designed for B5741-103-F-N-2.

Parameter Comparison

Parameter	B5741-103-F-N-2	M80-8400342
Manufacturer Part Number	B5741-103-F-N-2	M80-8400342
Manufacturer	Harwin Inc.	Harwin Inc.
Series	Datamate L-Tek	Datamate L-Tek
Product Status	Obsolete	Active
Connector Type	Receptacle	Receptacle
Contact Type	Female Socket	Female Socket
Number of Positions	3	3
Pitch - 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 - Post	Gold	Tin
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
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Voltage Rating	120V	800V
Insulation Material	Polyester, Glass Filled	Polyamide (PA46), Nylon 4/6, Glass Filled

Engineering Selection Recommendations

M80-8400342 is the active production equivalent for the obsolete B5741-103-F-N-2. Selection of M80-8400342 is supported by:

Product Status: M80-8400342 is active and in production, ensuring long-term availability and supply chain continuity compared to the obsolete B5741-103-F-N-2.

Regulatory Compliance: M80-8400342 achieves ROHS3 compliance, meeting current environmental and regulatory requirements. The original B5741-103-F-N-2 is RoHS non-compliant, making M80-8400342 the appropriate choice for applications subject to RoHS directives.

Electrical Performance: M80-8400342 provides an 800V voltage rating compared to the 120V rating of B5741-103-F-N-2, offering enhanced electrical performance margin for demanding applications.

Mechanical Compatibility: Both parts maintain identical mating pitch, position count, mounting type, and fastening mechanism, ensuring direct substitution in existing designs without PCB layout modifications.

Frequently Asked Questions (FAQ)

Q: Can M80-8400342 directly replace B5741-103-F-N-2 in existing designs?

A: Yes. Both connectors share identical mating pitch (0.079"), position count (3), mounting type (through hole), and fastening mechanism (locking ramp). The mating interface is fully compatible with existing connector pairs and PCB footprints.

Q: What is the difference in contact post finish between these parts?

A: B5741-103-F-N-2 features gold-plated posts, while M80-8400342 uses tin-plated posts. Both finishes provide adequate solder joint reliability for through-hole termination. The mating contacts remain gold-plated in both versions.

Q: Does the insulation material change affect compatibility?

A: The insulation material differs (polyester glass-filled versus polyamide glass-filled), but both maintain identical insulation height (0.202"), operating temperature range (-55°C ~ 125°C), and flammability rating (UL94 V-0). Mechanical and thermal compatibility is preserved.

Q: Why is M80-8400342 rated for 800V while B5741-103-F-N-2 is rated for 120V?

A: The voltage rating difference reflects the electrical performance specifications of each part. M80-8400342's higher rating provides greater design margin for applications requiring higher voltage isolation or performance headroom.

Q: What is the packaging difference?

A: B5741-103-F-N-2 packaging is not specified in available data. M80-8400342 is supplied in tube packaging, which is standard for production quantities of this connector type.

Q: Is M80-8400342 suitable for automotive and military applications?

A: Yes. M80-8400342 is rated for automotive, general purpose, and military applications, matching the application scope of B5741-103-F-N-2.

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