M20-7872546 Equivalent & Substitute Parts

Part Overview

The M20-7872546 is a 50-position rectangular receptacle connector manufactured by Harwin Inc., designed for surface mount applications with 0.100" (2.54mm) pitch. This connector features tin contact finish, push-pull fastening, and operates across -40°C to 105°C. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning.

Key Parameters

Parameter	M20-7872546
Manufacturer	Harwin Inc.
Number of Positions	50
Pitch - Mating	0.100" (2.54mm)
Number of Rows	2
Mounting Type	Surface Mount
Contact Finish - Mating	Tin
Current Rating	3A
Voltage Rating	1000V
Operating Temperature	-40°C ~ 105°C
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the M20-7872546 is determined by the following critical parameters:

Primary Compatibility Criteria:

Pitch - Mating: 0.100" (2.54mm)
Number of Rows: 2
Row Spacing - Mating: 0.100" (2.54mm)
Connector Type: Receptacle
Contact Type: Female Socket
Fastening Type: Push-Pull
Termination: Solder
Operating Temperature Range: -40°C ~ 105°C
Material Flammability Rating: UL94 V-0
RoHS Status: ROHS3 Compliant

Allowable Variations:

Number of Positions: May differ based on application requirements
Mounting Type: Surface Mount or Through Hole acceptable
Contact Finish - Mating: Tin or Gold acceptable
Current Rating: Equal or greater than 2.5A
Voltage Rating: Equal or greater than 500VAC

Parameter Comparison

Parameter	M20-7872546 (Main)	M20-7872042 (Harwin)	0015446850 (Molex)
Manufacturer	Harwin Inc.	Harwin Inc.	Molex
Number of Positions	50	40	50
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Number of Rows	2	2	2
Row Spacing - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Mounting Type	Surface Mount	Surface Mount	Through Hole
Contact Finish - Mating	Tin	Gold	Tin
Current Rating (Amps)	3A	3A	2.5A
Voltage Rating	1000V	1000V	500VAC
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

M20-7872042 (Harwin Inc.): This substitute maintains identical pitch, row configuration, and electrical ratings while offering active product status. The gold contact finish provides enhanced corrosion resistance compared to tin. Surface mount mounting type matches the original design. Selection is appropriate for applications where position count reduction from 50 to 40 is acceptable and where the design can accommodate gold-plated contacts.

0015446850 (Molex C-Grid 71850): This substitute maintains identical pitch, row configuration, and 50-position count. Through hole mounting represents a significant design change from surface mount. Voltage rating is reduced to 500VAC and current rating to 2.5A. Selection is appropriate only for applications where through hole mounting is feasible and electrical requirements do not exceed 500VAC or 2.5A. Active product status ensures long-term availability.

Both substitutes maintain UL94 V-0 flammability rating, ROHS3 compliance, and -40°C to 105°C operating temperature range, ensuring regulatory and environmental compatibility with the original specification.

Frequently Asked Questions (FAQ)

Q: Can M20-7872042 directly replace M20-7872546 in existing designs? A: M20-7872042 is compatible for applications tolerating a 40-position configuration instead of 50. Pitch, row spacing, mounting type, and operating temperature are identical. Gold contact finish is compatible with tin-plated mating connectors. Electrical ratings (3A, 1000V) are equivalent.

Q: What is the primary limitation of 0015446850 as a substitute? A: The mounting type differs fundamentally—0015446850 is through hole while M20-7872546 is surface mount. This requires PCB redesign. Additionally, voltage rating is 500VAC (versus 1000V) and current rating is 2.5A (versus 3A), making it unsuitable for high-voltage applications.

Q: Are there position count differences between substitutes? A: M20-7872042 provides 40 positions; 0015446850 provides 50 positions matching the original. Position count selection depends on application requirements and available connector footprint space.

Q: Do substitute parts maintain the same environmental and compliance certifications? A: Both substitutes maintain UL94 V-0 flammability rating, ROHS3 compliance, and -40°C to 105°C operating temperature range. Moisture sensitivity level (MSL 1) is identical across all three parts.

Q: What is the significance of product status differences? A: M20-7872546 is obsolete, limiting future procurement. M20-7872042 and 0015446850 are active products with assured long-term availability and manufacturing support.

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