B5741-220-F-N-2 Equivalent & Substitute Parts

Part Overview

The B5741-220-F-N-2 is a 20-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 locking ramp fastening. The part is currently obsolete, making identification of active equivalent substitutes essential for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Connector Type	Receptacle
Contact Type	Female Socket
Number of Positions	20
Pitch - Mating	0.079" (2.00mm)
Number of Rows	2
Row Spacing - Mating	0.079" (2.00mm)
Mounting Type	Through Hole
Termination	Solder
Fastening Type	Locking Ramp
Contact Finish - Mating	Gold
Operating Temperature	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0
Contact Material	Beryllium Copper
Series	Datamate L-Tek

Substitute Part Grouping Explanation

The M80-8502045 qualifies as a direct substitute for the B5741-220-F-N-2 based on the following critical parameters:

Identical connector type (Receptacle), contact type (Female Socket), and series (Datamate L-Tek)
Matching position count (20 positions) and pitch specifications (0.079" / 2.00mm mating pitch)
Identical row configuration (2 rows with 0.079" / 2.00mm row spacing)
Matching mounting type (Through Hole) and termination method (Solder)
Identical fastening type (Locking Ramp) and contact material (Beryllium Copper)
Matching contact finish on mating surface (Gold) and operating temperature range (-55°C ~ 125°C)
Equivalent flammability rating (UL94 V-0)

The M80-8502045 is an active product with higher inventory availability, making it the recommended replacement for the obsolete B5741-220-F-N-2.

Parameter Comparison

Parameter	B5741-220-F-N-2	M80-8502045
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	20	20
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)
Contact Length - Post	0.051" (1.30mm)	0.118" (3.00mm)
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0	UL94 V-0
Contact Finish - Post	Gold	Gold
Contact Material	Beryllium Copper	Beryllium Copper
Contact Finish Thickness - Post	11.0µin (0.30µm)	10.0µin (0.25µm)
Current Rating (Amps)	3A	Not specified
Voltage Rating	120V	800V
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Insulation Material	Polyester, Glass Filled	Polyamide (PA46), Nylon 4/6, Glass Filled
Packaging	Not specified	Tube
Inventory Status	963 Pcs New Original In Stock	16683 Pcs New Original In Stock

Engineering Selection Recommendations

The M80-8502045 is the direct active equivalent for the obsolete B5741-220-F-N-2. Both connectors share identical mechanical and electrical mating characteristics, ensuring pin-for-pin compatibility in board-to-board and cable applications.

Key considerations for selection:

The M80-8502045 features a longer contact post (0.118" / 3.00mm versus 0.051" / 1.30mm), which accommodates thicker PCB assemblies and provides greater engagement depth. This difference does not affect compatibility with standard mating connectors from the Datamate L-Tek series.

The M80-8502045 offers superior voltage rating (800V versus 120V) and ROHS3 compliance, making it suitable for applications requiring higher regulatory standards. The substitute part uses polyamide insulation material instead of polyester, providing improved thermal and mechanical properties.

The M80-8502045 is actively manufactured with significantly higher inventory availability (16683 units versus 963 units), ensuring supply continuity and shorter lead times for new designs and production runs.

Frequently Asked Questions (FAQ)

Q: Can M80-8502045 directly replace B5741-220-F-N-2 in existing designs?

A: Yes. Both connectors are Datamate L-Tek series receptacles with identical 20-position, 0.079" (2.00mm) pitch configurations. They share the same mating interface, fastening mechanism, and contact geometry. The longer contact post on the M80-8502045 accommodates thicker PCBs without affecting compatibility.

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

A: The B5741-220-F-N-2 has a 0.051" (1.30mm) contact post, while the M80-8502045 has a 0.118" (3.00mm) contact post. The longer post on the substitute provides greater engagement depth for thicker board assemblies. Both are compatible with standard Datamate L-Tek plug connectors.

Q: Does the voltage rating difference affect substitution?

A: The M80-8502045 has a higher voltage rating (800V versus 120V). This represents an improvement in electrical capability and does not restrict its use in applications rated for 120V or lower. The substitute is suitable for both the original application voltage and higher-voltage applications.

Q: Is the M80-8502045 RoHS compliant?

A: Yes. The M80-8502045 is ROHS3 compliant, whereas the B5741-220-F-N-2 is RoHS non-compliant. For applications requiring RoHS compliance, the M80-8502045 is the appropriate choice.

Q: What packaging is available for the M80-8502045?

A: The M80-8502045 is supplied in tube packaging. Verify packaging requirements for your procurement and assembly processes.

Q: Are there any insulation material differences?

A: The B5741-220-F-N-2 uses polyester glass-filled insulation, while the M80-8502045 uses polyamide (PA46) nylon 4/6 glass-filled insulation. Polyamide provides superior thermal stability and mechanical strength, making it suitable for demanding automotive and military applications.

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