M50-3903542 Equivalent & Substitute Parts

Part Overview

The M50-3903542 is a rectangular connector header manufactured by Harwin Inc., part of the Archer M50 series. This is a through-hole, right-angle connector with 70 positions at 1.27mm pitch, designed for board-to-board or cable applications. The part is currently obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

M50-3903542

Harwin Inc.In Stock: 769M50-3903542 Datasheet

Current PartRFQ

M50-3902042

Harwin Inc.In Stock: 1610M50-3902042 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of rectangular connector headers is determined by the following critical parameters:

• Pitch (Mating): Must be identical at 0.050" (1.27mm) to ensure mechanical and electrical compatibility with mating connectors
• Connector Type & Contact Type: Must remain Header with Male Pin configuration
• Mounting Type: Must be Through Hole, Right Angle to maintain PCB integration compatibility
• Termination Method: Must be Solder for consistent assembly processes
• Operating Temperature Range: Must support -40°C ~ 105°C minimum
• Current Rating: Must support 1A per Contact minimum
• Series Compatibility: Archer M50 series components maintain electrical and mechanical interchangeability

The M50-3902042 qualifies as a substitute based on these parameters. However, the number of positions differs: the substitute provides 40 positions versus the original 70 positions. This represents a reduced-capacity variant within the same connector family, suitable for applications requiring fewer connection points while maintaining all other electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The M50-3902042 is an active product within the Archer M50 series and maintains full compliance with ROHS3 and REACH requirements. Selection of this substitute is based on:

• Regulatory Compliance: Both components meet ROHS3 Compliant and REACH Unaffected standards
• Product Status: The substitute is active, ensuring continued availability and supply chain stability
• Electrical & Mechanical Equivalence: All critical parameters including pitch, contact type, mounting configuration, and operating specifications are identical
• Series Continuity: Both components belong to the Archer M50 family, ensuring design consistency

The primary design consideration is the reduction in position count from 70 to 40. Applications requiring the full 70-position capacity must evaluate whether the 40-position variant meets functional requirements or if alternative solutions within the Archer M50 series should be explored.

Frequently Asked Questions (FAQ)

Q: Can the M50-3902042 directly replace the M50-3903542 in existing designs?

A: Direct replacement depends on application requirements. The M50-3902042 maintains identical electrical and mechanical specifications for all parameters except position count. If the design uses fewer than 40 connection points, direct substitution is feasible. If all 70 positions are required, alternative components must be evaluated.

Q: Are there any compatibility issues between these connectors and their mating counterparts?

A: No. Both connectors share identical pitch (0.050" / 1.27mm), row spacing, contact geometry, and termination specifications. Mating connectors designed for either part will function identically with the other, provided the position count requirement is satisfied.

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

A: The M50-3903542 is obsolete, indicating discontinued manufacturing and limited availability. The M50-3902042 is active, ensuring ongoing production, supply chain availability, and manufacturer support. For new designs or long-term production requirements, the active substitute is preferred.

Q: Are the contact finishes and materials identical?

A: Yes. Both components feature gold-plated mating contacts (3.00µin thickness) and tin-plated posts (98.4µin thickness) on copper alloy substrates. Contact performance and reliability characteristics are equivalent.

Q: What compliance certifications apply to both components?

A: Both the M50-3903542 and M50-3902042 are ROHS3 Compliant, REACH Unaffected, and rated UL94 V-0 for material flammability. Moisture Sensitivity Level is 1 (Unlimited) for both components.