M50-3123545 Equivalent & Substitute Parts

Part Overview

The M50-3123545 is a 70-position receptacle connector from Harwin Inc.'s Archer M50 series, designed for board-to-board or cable applications with 0.050" (1.27mm) pitch spacing. This surface mount connector features gold-plated contacts, push-pull fastening, and operates across -40°C to 105°C. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

M50-3123545

Harwin Inc.In Stock: 763M50-3123545 Datasheet

Current PartRFQ

M50-3122045

Harwin Inc.In Stock: 936M50-3122045 Datasheet

MFR RecommendedRFQ

FLE-135-01-G-DV

Samtec Inc.In Stock: 1102FLE-135-01-G-DV Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the M50-3123545 is determined by the following critical parameters:

• Connector Type & Contact Type: Must be receptacle with female socket contacts
• Position Count & Pitch: 70 positions at 0.050" (1.27mm) mating pitch with 2-row configuration
• Row Spacing: 0.050" (1.27mm) row spacing for mechanical compatibility
• Mounting & Termination: Surface mount with solder termination
• Fastening & Contact Finish: Push-pull fastening with gold-plated mating contacts
• Insulation Material: Liquid Crystal Polymer (LCP)
• Contact Material: Phosphor Bronze

Two substitute parts meet these criteria:

FLE-135-01-G-DV (Samtec Inc.) matches all critical mechanical and electrical parameters with identical position count, pitch, row configuration, and contact specifications. This part is active and available.

M50-3122045 (Harwin Inc.) is a reduced-position variant with 40 positions instead of 70. This part shares the same pitch, row spacing, mounting type, and contact specifications but accommodates applications requiring fewer connection points within the same connector family.

Parameter Comparison

Engineering Selection Recommendations

FLE-135-01-G-DV is the direct equivalent for applications requiring 70-position connectivity. This Samtec part maintains identical mechanical and electrical specifications, including pitch, row configuration, and contact characteristics. The part is active and available with higher current rating (2A per contact versus 1A) and extended operating temperature range (-55°C to 125°C versus -40°C to 105°C). All regulatory compliance certifications (ROHS3, REACH Unaffected) are met. The primary design consideration is the increased insulation height (0.172" versus 0.142"), which may affect PCB layout in space-constrained applications.

M50-3122045 serves applications where 40-position connectivity is sufficient. This part remains within the Harwin Archer M50 family, maintaining design continuity for existing product lines. It shares identical pitch, row spacing, and contact specifications with the main part, with the trade-off of reduced position count. This option is suitable for designs that can accommodate the lower pin count while maintaining the same connector family and supplier relationship.

Frequently Asked Questions (FAQ)

Q: Can FLE-135-01-G-DV be used as a direct replacement for M50-3123545?

A: FLE-135-01-G-DV is mechanically and electrically compatible for 70-position applications. Both connectors share identical pitch (0.050"), row spacing (0.050"), mounting type (surface mount), and contact specifications (female socket, phosphor bronze, gold-plated). The primary design consideration is the increased insulation height (0.172" versus 0.142"), which requires verification against PCB layout constraints.

Q: What is the difference between M50-3122045 and M50-3123545?

A: M50-3122045 is a 40-position variant of the same Archer M50 series, while M50-3123545 is a 70-position connector. Both share identical pitch, row spacing, mounting type, and contact materials. Selection depends on the required number of connection points for the application.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both FLE-135-01-G-DV and M50-3122045 are ROHS3 compliant and REACH unaffected, matching the compliance status of the main part.

Q: Does the higher current rating of FLE-135-01-G-DV affect compatibility?

A: No. The FLE-135-01-G-DV's 2A per contact rating is a performance advantage over the 1A rating of M50-3123545. Applications designed for 1A operation remain fully compatible.

Q: What packaging considerations apply to these substitutes?

A: M50-3123545 is supplied in standard packaging (unspecified). FLE-135-01-G-DV is supplied in bulk packaging, while M50-3122045 is supplied in tube packaging. Procurement and handling procedures may differ based on packaging format.

Q: Can M50-3122045 be used in designs originally specified for M50-3123545?

A: M50-3122045 is compatible only for applications requiring 40 or fewer connection points. Designs requiring all 70 positions cannot use this reduced-position variant without circuit redesign.