M50-4703945 Equivalent & Substitute Parts

Part Overview

The M50-4703945 is a rectangular connector header manufactured by Harwin Inc., designed for through-hole board-to-board applications. This vertical mount header features 78 positions arranged in 2 rows with 0.050" (1.27mm) pitch spacing and shrouded 4-wall construction. The part is classified as obsolete, making identification of active equivalent components essential for ongoing design support and procurement continuity.

Substiute Parts

M50-4703945

Harwin Inc.In Stock: 694M50-4703945 Datasheet

Current PartRFQ

SBH31-NBPB-D39-ST-BK

Sullins Connector SolutionsIn Stock: 792SBH31-NBPB-D39-ST-BK Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the M50-4703945 is based on strict equivalence of the following critical parameters:

• Connector type (Header) and contact type (Male Pin)
• Position count (78) and row configuration (2 rows)
• Mating pitch and row spacing (0.050" / 1.27mm)
• Mounting method (Through Hole) and termination (Solder)
• Shrouding configuration (Shrouded - 4 Wall)
• Fastening mechanism (Push-Pull)
• Environmental ratings (Operating temperature, flammability, RoHS compliance)

The substitute part SBH31-NBPB-D39-ST-BK from Sullins Connector Solutions meets all these criteria. Minor variations in contact post length, insulation height, and contact material composition do not affect functional interchangeability in board-to-board applications where these parameters fall within acceptable mechanical tolerances.

Parameter Comparison

Engineering Selection Recommendations

The SBH31-NBPB-D39-ST-BK is the qualified substitute for the obsolete M50-4703945. Selection is supported by:

• Active product status ensuring ongoing availability and manufacturing support
• Full compliance with ROHS3 and REACH requirements matching the original part
• Identical environmental operating range (-40°C ~ 105°C) and flammability rating (UL94 V-0)
• Equivalent electrical performance with 1A per contact current rating
• Mechanical compatibility within standard PCB assembly tolerances for the 0.050" pitch standard

The minor dimensional variations in post length (0.003" difference) and insulation height (0.029" difference) are within acceptable mechanical tolerances for standard board-to-board connector applications and do not impact functional performance or mating reliability.

Frequently Asked Questions (FAQ)

Q: Can the SBH31-NBPB-D39-ST-BK directly replace the M50-4703945 in existing designs?

A: Yes. Both parts share identical connector type, position count, pitch spacing, mounting method, and shrouding configuration. The dimensional variations in post length and insulation height fall within standard mechanical tolerances for 0.050" pitch connectors and do not affect mating or performance.

Q: What is the significance of the different insulation materials (LCP vs. Polyamide)?

A: Both materials meet UL94 V-0 flammability requirements and operate across the identical temperature range (-40°C ~ 105°C). Material selection does not affect electrical performance or environmental compliance for this application category.

Q: Are there packaging differences between these parts?

A: The M50-4703945 packaging is not specified in available data. The SBH31-NBPB-D39-ST-BK is supplied in Tray packaging. Verify packaging requirements for your procurement and assembly processes.

Q: Why is the M50-4703945 classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Harwin Inc. The SBH31-NBPB-D39-ST-BK from Sullins Connector Solutions maintains active production status and provides equivalent functionality for new designs and legacy system support.

Q: Are both parts RoHS compliant?

A: Yes. Both the M50-4703945 and SBH31-NBPB-D39-ST-BK are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements.