B5741-208-F-N-0 Equivalent & Substitute Parts

Part Overview

The B5741-208-F-N-0 is an 8-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 mating contacts, through-hole solder termination, and a locking ramp fastening mechanism. The part is currently obsolete, making identification of compatible substitutes essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Connector Type	Receptacle
Number of Positions	8
Pitch - Mating	0.079" (2.00mm)
Number of Rows	2
Row Spacing - Mating	0.079" (2.00mm)
Mounting Type	Through Hole
Termination	Solder
Contact Finish - Mating	Gold
Operating Temperature Range	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0
Contact Material	Beryllium Copper
Series	Datamate L-Tek

Substitute Part Grouping Explanation

Substitution eligibility for the B5741-208-F-N-0 is determined by strict alignment of the following core parameters:

Connector type: Receptacle
Contact type: Female socket
Number of positions: 8
Mating pitch: 0.079" (2.00mm)
Row configuration: 2 rows at 0.079" (2.00mm) spacing
Mounting method: Through hole
Termination method: Solder
Mating contact finish: Gold
Operating temperature range: -55°C ~ 125°C
Contact material: Beryllium copper
Fastening type: Locking ramp

The substitute part M80-8500842 meets all these core electrical and mechanical parameters, maintaining full compatibility with applications designed for the B5741-208-F-N-0.

Parameter Comparison

Parameter	B5741-208-F-N-0	M80-8500842
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	8	8
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
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 Material	Beryllium Copper	Beryllium Copper
Contact Finish Thickness - Post	157.5µin (4.00µm)	157.5µin (4.00µm)
Fastening Type	Locking Ramp	Locking Ramp
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Voltage Rating	120V	800V
Contact Length - Post	0.051" (1.30mm)	0.118" (3.00mm)
Contact Finish - Post	Tin-Lead	Tin
Insulation Material	Polyester, Glass Filled	Polyamide (PA46), Nylon 4/6, Glass Filled

Engineering Selection Recommendations

M80-8500842 is the direct substitute for B5741-208-F-N-0. Both connectors share identical mechanical and electrical core specifications within the Datamate L-Tek series, ensuring pin-compatible operation in existing designs.

The primary distinction is product lifecycle status: B5741-208-F-N-0 is obsolete, while M80-8500842 is active production. M80-8500842 offers improved compliance posture with ROHS3 certification compared to the non-compliant status of the original part. The substitute also provides higher voltage rating (800V versus 120V) and improved insulation material composition, delivering enhanced performance margins for new applications.

Contact post length differs between the two parts (0.051" versus 0.118"), which may affect PCB design considerations in retrofit scenarios. Contact finish on the post changes from tin-lead to tin, reflecting modern manufacturing standards.

Frequently Asked Questions (FAQ)

Q: Can M80-8500842 directly replace B5741-208-F-N-0 in existing assemblies?

A: Yes. Both connectors maintain identical mating pitch (0.079"), row configuration (2 rows at 0.079" spacing), number of positions (8), mounting method (through hole), and contact materials. Mechanical and electrical compatibility is assured for standard board-to-board and cable applications.

Q: What is the significance of the different contact post lengths?

A: B5741-208-F-N-0 has a 0.051" (1.30mm) post length, while M80-8500842 has 0.118" (3.00mm). For new designs, the longer post of M80-8500842 provides greater solder joint engagement and mechanical robustness. In retrofit applications where PCB hole depth is constrained, post length compatibility must be verified against board specifications.

Q: Does the change in insulation material affect performance?

A: Both materials (polyester glass-filled versus polyamide glass-filled) meet UL94 V-0 flammability requirements and operate across the identical temperature range (-55°C ~ 125°C). The polyamide composition in M80-8500842 represents current manufacturing standards and offers equivalent or superior mechanical properties for this connector class.

Q: Why is the voltage rating different between the two parts?

A: B5741-208-F-N-0 is rated at 120V, while M80-8500842 is rated at 800V. This difference reflects design improvements in the active production variant. Applications requiring only 120V operation remain fully compatible; applications requiring higher voltage margins benefit from the enhanced rating of M80-8500842.

Q: What is the impact of RoHS compliance differences?

A: B5741-208-F-N-0 is RoHS non-compliant (tin-lead post finish), while M80-8500842 is ROHS3 compliant (tin post finish). For new designs subject to RoHS regulations or customer requirements, M80-8500842 is the appropriate selection. Existing legacy systems using B5741-208-F-N-0 may continue operation without modification.

Q: Are there packaging differences between these parts?

A: B5741-208-F-N-0 packaging is not specified in available data. M80-8500842 is supplied in tube packaging. Confirm packaging requirements with your procurement or supply chain team for volume orders.

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