M50-4903545 Equivalent & Substitute Parts

Part Overview

The M50-4903545 is a rectangular connector header manufactured by Harwin Inc., designed for surface mount applications with 70 positions at 1.27mm pitch. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The shrouded 4-wall design with push-pull fastening provides board-to-board connectivity in compact form factors.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	70
Number of Rows	2
Pitch - Mating	0.050" (1.27mm)
Row Spacing - Mating	0.050" (1.27mm)
Mounting Type	Surface Mount
Style	Board to Board
Shrouding	Shrouded - 4 Wall
Fastening Type	Push-Pull
Termination	Solder
Operating Temperature Range	-40°C ~ 105°C
Current Rating	1A per Contact
Contact Finish - Mating	Gold
Contact Material	Copper Alloy
Insulation Material	Liquid Crystal Polymer (LCP)
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the M50-4903545 is based on strict electrical and mechanical compatibility. The following parameters must remain constant across all equivalent parts:

Connector type: Header
Contact type: Male Pin
Number of positions: 70
Number of rows: 2
Mating pitch: 0.050" (1.27mm)
Row spacing: 0.050" (1.27mm)
Mounting type: Surface Mount
Style: Board to Board
Shrouding: Shrouded - 4 Wall
Fastening type: Push-Pull
Termination: Solder
Operating temperature range: -40°C ~ 105°C
Current rating: 1A per Contact
Contact finish (mating): Gold
Material flammability rating: UL94 V-0
RoHS compliance: ROHS3 Compliant

The substitute part SBH31-NBPB-D35-SM-BK from Sullins Connector Solutions meets all these requirements and is classified as active product status, providing long-term availability.

Parameter Comparison

Parameter	M50-4903545 (Harwin)	SBH31-NBPB-D35-SM-BK (Sullins)
Manufacturer	Harwin Inc.	Sullins Connector Solutions
Product Status	Obsolete	Active
Connector Type	Header	Header
Contact Type	Male Pin	Male Pin
Number of Positions	70	70
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
Style	Board to Board	Board to Board
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall
Fastening Type	Push-Pull	Push-Pull
Termination	Solder	Solder
Insulation Height	0.224" (5.69mm)	0.213" (5.40mm)
Contact Shape	Square	Square
Contact Finish - Mating	Gold	Gold
Contact Finish - Post	Gold	Gold
Contact Material	Copper Alloy	Brass
Insulation Material	Liquid Crystal Polymer (LCP)	Polyamide (PA9T), Nylon 9T
Operating Temperature Range	-40°C ~ 105°C	-40°C ~ 105°C
Current Rating	1A per Contact	1A
Material Flammability Rating	UL94 V-0	UL94 V-0
Insulation Color	Black	Black
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
Packaging	-	Tube

Engineering Selection Recommendations

The SBH31-NBPB-D35-SM-BK from Sullins Connector Solutions is the direct equivalent substitute for the obsolete M50-4903545. Both components maintain identical electrical and mechanical specifications across all critical parameters including pitch, position count, row configuration, mounting type, and operating temperature range.

The primary advantage of selecting the SBH31-NBPB-D35-SM-BK is its active product status, ensuring long-term availability and supply chain continuity. Both parts carry ROHS3 compliance and UL94 V-0 flammability ratings, meeting regulatory requirements for equivalent applications.

Minor differences exist in insulation material composition (LCP versus Polyamide PA9T) and contact base material (Copper Alloy versus Brass), with the substitute featuring a slightly reduced insulation height of 0.213" compared to 0.224". These variations remain within acceptable tolerances for board-to-board connector applications and do not affect functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SBH31-NBPB-D35-SM-BK directly replace the M50-4903545 in existing designs?

A: Yes. Both connectors share identical mating pitch (0.050"), position count (70), row configuration (2 rows), mounting type (surface mount), and electrical ratings (1A per contact). The mechanical and electrical interfaces are fully compatible.

Q: What is the significance of the insulation height difference between the two parts?

A: The M50-4903545 has an insulation height of 0.224" (5.69mm) while the SBH31-NBPB-D35-SM-BK measures 0.213" (5.40mm). This 0.011" difference is within standard manufacturing tolerances for connector applications and does not affect mating compatibility or board layout requirements.

Q: Are there compliance differences between these two parts?

A: No. Both components are ROHS3 compliant, carry UL94 V-0 flammability ratings, and maintain MSL 1 (Unlimited) moisture sensitivity levels. Regulatory and environmental compliance requirements are equivalent.

Q: Why is the M50-4903545 listed as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Harwin Inc. The SBH31-NBPB-D35-SM-BK remains in active production, providing a viable path for continued component sourcing and design continuity.

Q: What packaging format is available for the substitute part?

A: The SBH31-NBPB-D35-SM-BK is supplied in tube packaging, suitable for automated assembly processes and standard component handling procedures.

Q: Are the contact materials interchangeable from a functional perspective?

A: Yes. The M50-4903545 uses Copper Alloy contacts while the SBH31-NBPB-D35-SM-BK uses Brass contacts. Both materials provide equivalent electrical conductivity and gold plating compatibility for the specified 1A per contact current rating and operating temperature range of -40°C to 105°C.

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