M50-4903845 Equivalent & Substitute Parts

Part Overview

The M50-4903845 is a rectangular connector header manufactured by Harwin Inc., designed for surface mount board-to-board applications. This connector features 76 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 functionally equivalent alternatives essential for ongoing design support and procurement planning.

Substiute Parts

M50-4903845

Harwin Inc.In Stock: 1102M50-4903845 Datasheet

Current PartRFQ

SBH31-NBPB-D38-SM-BK

Sullins Connector SolutionsIn Stock: 1100SBH31-NBPB-D38-SM-BK Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SBH31-NBPB-D38-SM-BK from Sullins Connector Solutions qualifies as a functional substitute based on the following critical parameters:

Matching Parameters:

• Connector type: Header
• Contact type: Male Pin
• Position count: 76 positions
• Row configuration: 2 rows
• Mating pitch: 0.050" (1.27mm)
• Row spacing: 0.050" (1.27mm)
• Mounting: Surface Mount
• Style: Board to Board
• Shrouding: Shrouded - 4 Wall
• Termination: Solder
• Fastening: Push-Pull
• Operating temperature range: -40°C ~ 105°C
• Current rating: 1A per contact
• Contact finish (mating): Gold
• Flammability: UL94 V-0
• RoHS compliance: ROHS3 Compliant
• MSL rating: 1 (Unlimited)

The substitute maintains electrical and mechanical compatibility through identical pitch spacing, position count, and contact configuration. Both parts meet the same environmental and compliance standards.

Parameter Comparison

Engineering Selection Recommendations

The SBH31-NBPB-D38-SM-BK is a direct functional equivalent for the obsolete M50-4903845. The substitute part maintains all critical electrical and mechanical parameters required for board-to-board connectivity in surface mount applications.

Key advantages of the substitute:

• Active product status ensures ongoing availability and supply chain continuity
• Identical pitch spacing (0.050"), position count (76), and row configuration (2 rows) guarantee mechanical compatibility
• Matching operating temperature range (-40°C ~ 105°C) and current rating (1A per contact) preserve electrical performance
• Both parts meet UL94 V-0 flammability and ROHS3 compliance requirements
• MSL rating of 1 (Unlimited) on both parts indicates equivalent moisture handling

Design considerations:

• Insulation height differs by 0.011" (0.29mm): M50-4903845 at 0.224" (5.69mm) versus SBH31-NBPB-D38-SM-BK at 0.213" (5.40mm). This minor variation is within typical PCB layout tolerances for board-to-board spacing.
• Contact material differs: M50-4903845 uses Copper Alloy while SBH31-NBPB-D38-SM-BK uses Brass. Both materials with gold plating provide equivalent contact resistance and reliability.
• Insulation material differs: M50-4903845 uses Liquid Crystal Polymer (LCP) while SBH31-NBPB-D38-SM-BK uses Polyamide (PA9T), Nylon 9T. Both materials meet UL94 V-0 requirements and operate within the specified temperature range.

Frequently Asked Questions (FAQ)

Q: Can the SBH31-NBPB-D38-SM-BK directly replace the M50-4903845 in existing designs?

A: Yes. Both connectors share identical mating pitch (0.050"), position count (76), row configuration (2 rows), and board-to-board style. The minor 0.011" difference in insulation height does not affect PCB layout compatibility for standard board spacing applications.

Q: What are the key compatibility criteria for this connector family?

A: Substitution is valid when the following parameters match: mating pitch (0.050"), number of positions (76), number of rows (2), row spacing (0.050"), mounting type (Surface Mount), connector style (Board to Board), shrouding (Shrouded - 4 Wall), and termination method (Solder). All these parameters are identical between the main part and substitute.

Q: Are there differences in contact material between these parts?

A: Yes. The M50-4903845 uses Copper Alloy contacts while the SBH31-NBPB-D38-SM-BK uses Brass contacts. Both materials are plated with gold for mating surfaces and provide equivalent electrical performance and contact resistance in this application.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the M50-4903845 and SBH31-NBPB-D38-SM-BK are ROHS3 Compliant, UL94 V-0 rated, and carry MSL 1 (Unlimited) moisture sensitivity ratings. Both meet identical environmental and regulatory requirements.

Q: What is the significance of the product status difference?

A: The M50-4903845 is classified as obsolete, meaning Harwin Inc. no longer manufactures or supports this part. The SBH31-NBPB-D38-SM-BK is active, ensuring continued availability, technical support, and supply chain reliability for new designs and ongoing production.

Q: Are there packaging differences between these parts?

A: The M50-4903845 packaging information is not specified in the available data. The SBH31-NBPB-D38-SM-BK is supplied in Tube packaging. Confirm packaging requirements with your procurement department when transitioning between parts.