M50-4303545 Equivalent & Substitute Parts

Part Overview

The M50-4303545 is a 70-position receptacle connector from Harwin Inc.'s Archer M50 series, designed for board-to-board applications with 0.050" (1.27mm) pitch spacing. This surface mount connector features gold-plated contacts, push-pull fastening, and is rated for -40°C to 105°C operation. The part is currently obsolete, making equivalent substitutes necessary for new designs or component replenishment.

Substiute Parts

M50-4303545

Harwin Inc.In Stock: 889M50-4303545 Datasheet

Current PartRFQ

M50-4302045

Harwin Inc.In Stock: 1132M50-4302045 Datasheet

MFR RecommendedRFQ

SFM-135-02-S-D-A

Samtec Inc.In Stock: 1328SFM-135-02-S-D-A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the M50-4303545 is determined by the following critical parameters:

Primary Matching Criteria:

• Connector type: Receptacle
• Contact type: Female socket
• Pitch spacing: 0.050" (1.27mm)
• Mounting type: Surface mount
• Fastening mechanism: Push-pull
• Insulation material: Liquid Crystal Polymer (LCP)
• Contact finish: Gold plating on mating surface

Acceptable Variation Parameters:

• Number of positions (70 positions preferred; 40 positions acceptable for reduced-pin applications)
• Operating temperature range (higher ranges acceptable)
• Current rating (higher ratings acceptable)
• Mated stacking heights (multiple options acceptable)
• Contact material composition (phosphor bronze or beryllium copper acceptable)

The two substitute parts listed meet these criteria with specific trade-offs documented in the parameter comparison table.

Parameter Comparison

Engineering Selection Recommendations

M50-4302045 (Harwin Inc.): This substitute is recommended for applications where pin count reduction is acceptable. It maintains identical pitch, row spacing, mounting type, and fastening mechanism as the original M50-4303545. Both parts share the same series lineage (Archer M50), identical operating temperature range, and equivalent current ratings. The M50-4302045 is currently in active production status with higher inventory availability. Use this substitute when your design can accommodate 40 positions instead of 70.

SFM-135-02-S-D-A (Samtec Inc.): This substitute maintains the full 70-position count and is the direct functional equivalent for applications requiring identical pin density. The SFM-135-02-S-D-A offers enhanced performance specifications: extended operating temperature range (-55°C to 125°C versus -40°C to 105°C) and significantly higher current rating (3.2A per contact versus 1A). This part is manufactured by Samtec Inc. and is in active production. The contact finish thickness is specified at 30.0µin (0.76µm) on the mating surface. Use this substitute for designs requiring the original 70-position configuration with improved thermal and current handling capabilities.

Both substitutes are ROHS3 compliant and maintain the same insulation material (LCP) and fastening mechanism (push-pull) as the original part.

Frequently Asked Questions (FAQ)

Q: Can M50-4302045 be used as a direct replacement for M50-4303545?

A: M50-4302045 is functionally compatible but with a critical difference: it provides 40 positions instead of 70. All other electrical and mechanical parameters are identical. This substitute is suitable only if your application can operate with reduced pin count.

Q: What are the main differences between the two substitute options?

A: M50-4302045 reduces pin count to 40 positions while maintaining all other specifications. SFM-135-02-S-D-A preserves the full 70-position configuration and adds enhanced performance: wider operating temperature range (-55°C to 125°C) and higher current capacity (3.2A per contact). Both are active production parts with equivalent compliance certifications.

Q: Are the mating interfaces compatible between M50-4303545 and its substitutes?

A: Yes. Both substitutes share the same 0.050" (1.27mm) pitch spacing, 2-row configuration, and push-pull fastening mechanism. Mating connectors designed for the original part will interface with either substitute, subject to pin count compatibility.

Q: What is the significance of the contact material difference?

A: M50-4303545 and M50-4302045 use phosphor bronze contacts, while SFM-135-02-S-D-A uses beryllium copper. Both materials are suitable for gold-plated surface mount connectors in the specified applications. Beryllium copper offers superior spring characteristics and contact reliability at higher current levels.

Q: Are there packaging differences between these parts?

A: M50-4302045 and SFM-135-02-S-D-A are supplied in tube packaging. Both are available in higher inventory quantities than the obsolete M50-4303545.

Q: Which substitute should I select for new designs?

A: For new designs requiring 70 positions, select SFM-135-02-S-D-A. It provides superior performance specifications and active production status. For designs where 40 positions are sufficient, M50-4302045 offers continuity within the Harwin Archer M50 series.