M50-4901745 Equivalent & Substitute Parts

Part Overview

The M50-4901745 is a rectangular connector header manufactured by Harwin Inc., designed for surface mount applications with 34 positions at 1.27mm pitch. This component features a shrouded 4-wall design with male pins, gold-plated contacts, and solder termination for board-to-board connectivity.

The M50-4901745 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	Header
Contact Type	Male Pin
Number of Positions	34
Number of Rows	2
Pitch - Mating	0.050" (1.27mm)
Row Spacing - Mating	0.050" (1.27mm)
Mounting Type	Surface Mount
Shrouding	Shrouded - 4 Wall
Termination	Solder
Fastening Type	Push-Pull
Contact Finish - Mating	Gold
Contact Material	Copper Alloy
Insulation Material	Liquid Crystal Polymer (LCP)
Operating Temperature	-40°C ~ 105°C
Current Rating	1A per Contact
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

The SBH31-NBPB-D17-SM-BK from Sullins Connector Solutions qualifies as a direct substitute for the M50-4901745 based on the following critical parameters:

Connector Configuration: Both parts are 34-position, 2-row header connectors with identical 0.050" (1.27mm) mating pitch and row spacing
Mounting and Termination: Both utilize surface mount technology with solder termination and push-pull fastening
Electrical Characteristics: Both support 1A per contact with gold-plated mating contacts
Environmental Compliance: Both meet UL94 V-0 flammability rating, ROHS3 compliance, and MSL 1 (Unlimited) moisture sensitivity
Operating Range: Both function across -40°C to 105°C temperature range
Shrouding Design: Both feature shrouded 4-wall construction for board-to-board applications

The substitute part maintains functional and electrical equivalence across all specified parameters, enabling direct replacement in applications requiring the M50-4901745.

Parameter Comparison

Parameter	M50-4901745 (Harwin)	SBH31-NBPB-D17-SM-BK (Sullins)
Connector Type	Header	Header
Contact Type	Male Pin	Male Pin
Number of Positions	34	34
Number of Rows	2	2
Pitch - Mating	0.050" (1.27mm)	0.050" (1.27mm)
Row Spacing - Mating	0.050" (1.27mm)	0.050" (1.27mm)
Mounting Type	Surface Mount	Surface Mount
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall
Termination	Solder	Solder
Fastening Type	Push-Pull	Push-Pull
Contact Finish - Mating	Gold	Gold
Insulation Material	Liquid Crystal Polymer (LCP)	Polyamide (PA9T), Nylon 9T
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C
Current Rating	1A per Contact	1A
Material Flammability Rating	UL94 V-0	UL94 V-0
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The SBH31-NBPB-D17-SM-BK is the recommended substitute for the obsolete M50-4901745. Selection is based on the following factors:

Product Status: The substitute part maintains Active status, ensuring ongoing availability and supply chain support, whereas the original part is Obsolete
Compliance Alignment: Both parts meet identical regulatory requirements including ROHS3 compliance, UL94 V-0 flammability rating, and REACH Unaffected status
Functional Equivalence: All critical electrical and mechanical parameters match across connector configuration, pitch, contact rating, and operating temperature range
Material Consideration: The substitute uses Polyamide (PA9T) Nylon 9T insulation material instead of Liquid Crystal Polymer (LCP), both of which meet the same flammability and environmental standards specified for this application class

Frequently Asked Questions (FAQ)

Q: Can the SBH31-NBPB-D17-SM-BK directly replace the M50-4901745 in existing designs?

A: Yes. Both connectors share identical mating pitch (0.050" / 1.27mm), position count (34), row configuration (2 rows), and row spacing. The surface mount footprint, solder termination, and push-pull fastening mechanism are equivalent, enabling direct PCB-level substitution.

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

A: The M50-4901745 uses Liquid Crystal Polymer (LCP) insulation material, while the SBH31-NBPB-D17-SM-BK uses Polyamide (PA9T) Nylon 9T. Both materials meet UL94 V-0 flammability requirements and are suitable for the specified operating temperature range of -40°C to 105°C.

Q: Are there any packaging differences?

A: The M50-4901745 packaging specification is not provided in the available data. The SBH31-NBPB-D17-SM-BK is supplied in Tube packaging. Verify packaging requirements for your procurement and assembly processes.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the M50-4901745 and SBH31-NBPB-D17-SM-BK are ROHS3 compliant, REACH Unaffected, carry UL94 V-0 flammability rating, and maintain MSL 1 (Unlimited) moisture sensitivity level classification.

Q: What is the current rating for each contact?

A: Both parts support 1A per contact, providing equivalent electrical performance for applications requiring this current capacity.

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