M20-7872942 Equivalent & Substitute Parts

Part Overview

The M20-7872942 is a 58-position rectangular receptacle connector manufactured by Harwin Inc., designed for surface mount applications with 0.100" (2.54mm) pitch spacing. This connector features gold-plated mating contacts, push-pull fastening, and operates across -40°C to 105°C. The part is currently listed as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement planning.

Substiute Parts

M20-7872942

Harwin Inc.In Stock: 761M20-7872942 Datasheet

Current PartRFQ

M20-7872042

Harwin Inc.In Stock: 962M20-7872042 Datasheet

MFR RecommendedRFQ

0015445858

MolexIn Stock: 10870015445858 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the M20-7872942 is determined by the following critical parameters:

• Number of Positions: 58 positions (exact match required for connector density)
• Pitch - Mating: 0.100" (2.54mm) (determines mechanical and electrical compatibility)
• Number of Rows: 2 rows (defines physical layout)
• Connector Type: Receptacle with bottom or top entry capability
• Contact Type: Female socket contacts
• Contact Finish - Mating: Gold plating (electrical performance and corrosion resistance)
• Current Rating: Minimum 3A (electrical load capacity)
• Voltage Rating: Minimum 1000V (electrical stress tolerance)
• Operating Temperature Range: Must encompass -40°C to 105°C
• Fastening Type: Push-pull mechanism
• Termination: Solder termination

The substitute parts identified below are grouped based on alignment with these parameters. Variations in mounting type (surface mount versus through-hole) and insulation material represent acceptable engineering trade-offs when all electrical and mechanical parameters remain compatible.

Parameter Comparison

Engineering Selection Recommendations

M20-7872042 (Harwin Inc.)

This part maintains full compatibility with the M20-7872942 across all critical electrical and mechanical parameters: identical pitch, row configuration, contact finish, current rating, voltage rating, and operating temperature range. Both parts are manufactured by Harwin Inc. using the same insulation material and fastening mechanism. The M20-7872042 is currently in active production status with ROHS3 compliance. The primary design consideration is the reduced position count (40 versus 58), which requires connector density evaluation for the target application.

0015445858 (Molex C-Grid 71850 Series)

This Molex receptacle provides electrical compatibility with matching pitch, row count, contact type, and fastening mechanism. The part maintains the 58-position configuration of the original M20-7872942. Key differences include mounting type (through-hole versus surface mount), reduced current rating (2.5A versus 3A), reduced voltage rating (500VAC versus 1000V), and different insulation material (LCP glass-filled versus nylon 6T). The part is in active production with ROHS3 compliance and extended operating temperature range (-40°C to 125°C). Selection of this substitute requires confirmation that the through-hole mounting approach and reduced electrical ratings are acceptable for the target circuit design.

Frequently Asked Questions (FAQ)

Q: Can M20-7872042 replace M20-7872942 in all applications?

A: M20-7872042 is electrically and mechanically compatible with M20-7872942 across all specified parameters except position count. Applications requiring exactly 58 positions cannot use the 40-position M20-7872042 without redesign. Applications tolerating 40 positions can proceed with direct substitution.

Q: What are the key differences between the Harwin and Molex substitutes?

A: M20-7872042 maintains surface mount configuration and full electrical ratings. The Molex 0015445858 requires through-hole mounting, operates at reduced current (2.5A) and voltage (500VAC), and uses different insulation material. Both maintain 58-position configuration and 0.100" pitch compatibility.

Q: Does the Molex 0015445858 meet the voltage requirements of the original design?

A: The Molex part is rated for 500VAC, while the M20-7872942 is rated for 1000V. Applications requiring 1000V operation cannot use the Molex substitute without electrical redesign verification.

Q: Are there mounting considerations when switching from M20-7872942 to 0015445858?

A: Yes. The M20-7872942 is surface mount; the Molex 0015445858 is through-hole. PCB layout and assembly process changes are required for through-hole mounting.

Q: Do all three parts share the same compliance certifications?

A: All three parts are ROHS3 compliant, REACH unaffected, and classified as EAR99. All use phosphor bronze contacts with gold mating finish and tin post finish. All are rated UL94 V-0 for flammability.

Q: What is the impact of different insulation materials on connector performance?

A: M20-7872942 and M20-7872042 use polyamide (nylon 6T); the Molex part uses liquid crystal polymer (LCP) glass-filled. Both materials meet the specified operating temperature and voltage requirements. Material selection affects mechanical properties and environmental resistance but does not alter electrical compatibility for the specified parameters.