M20-7873342 Equivalent & Substitute Parts

Part Overview

The M20-7873342 is a 66-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 classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	M20-7873342
Manufacturer	Harwin Inc.
Category	Rectangular Connectors
Number of Positions	66
Pitch - Mating	0.100" (2.54mm)
Number of Rows	2
Mounting Type	Surface Mount
Contact Finish - Mating	Gold
Current Rating	3A
Voltage Rating	1000V
Operating Temperature	-40°C ~ 105°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the M20-7873342 is determined by the following critical parameters:

Primary Matching Criteria:

Number of positions: 66
Pitch spacing: 0.100" (2.54mm)
Row configuration: 2 rows
Contact type: Female socket receptacle
Mating contact finish: Gold
Fastening type: Push-pull
Connector style: Board to board or cable

Secondary Compatibility Factors:

Voltage rating: minimum 1000V
Current rating: minimum 3A
Operating temperature range: -40°C to 105°C or broader
Material flammability: UL94 V-0
RoHS3 compliance

The substitute parts identified maintain compatibility across these core electrical and mechanical parameters, though mounting technology and insulation material may differ based on design requirements.

Parameter Comparison

Parameter	M20-7873342 (Main)	M20-7872042 (Harwin)	0015445866 (Molex)
Manufacturer	Harwin Inc.	Harwin Inc.	Molex
Number of Positions	66	40	66
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Number of Rows	2	2	2
Mounting Type	Surface Mount	Surface Mount	Through Hole
Contact Type	Female Socket	Female Socket	Female Socket
Contact Finish - Mating	Gold	Gold	Gold
Fastening Type	Push-Pull	Push-Pull	Push-Pull
Current Rating (Amps)	3A	3A	2.5A
Voltage Rating	1000V	1000V	500VAC
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 125°C
Insulation Material	Polyamide (PA6T), Nylon 6T	Polyamide (PA6T), Nylon 6T	Liquid Crystal Polymer (LCP), Glass Filled
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 part maintains identical electrical specifications, mounting technology, and material composition to the M20-7873342. The primary difference is position count (40 vs. 66), making this suitable only for applications where reduced pin density is acceptable. Active product status ensures ongoing availability and supply chain continuity.

0015445866 (Molex C-Grid 71850 Series): This connector provides full 66-position compatibility with identical pitch and row configuration. Key differences include through-hole mounting versus surface mount, lower current rating (2.5A vs. 3A), and reduced voltage rating (500VAC vs. 1000V). The extended operating temperature range (-40°C to 125°C) and LCP insulation material offer enhanced thermal performance. Through-hole mounting requires PCB design modification. This part is active and RoHS3 compliant.

Selection between substitutes depends on application requirements: M20-7872042 for same-form-factor surface mount designs with reduced pin requirements, or 0015445866 for designs accommodating through-hole mounting with full 66-position connectivity.

Frequently Asked Questions (FAQ)

Q: Can M20-7872042 directly replace M20-7873342 in existing designs? A: M20-7872042 shares identical electrical ratings, mounting type, and material specifications. However, it provides only 40 positions versus 66, requiring design verification that reduced pin count meets functional requirements.

Q: What are the mounting differences between M20-7873342 and 0015445866? A: M20-7873342 uses surface mount technology with solder termination to PCB pads. 0015445866 uses through-hole mounting with post contacts inserted into PCB holes. PCB layout and assembly processes differ significantly between these technologies.

Q: Is 0015445866 suitable for high-voltage applications? A: 0015445866 has a voltage rating of 500VAC, which is lower than M20-7873342's 1000V rating. Applications requiring 1000V operation must verify that 500VAC meets system requirements or select an alternative.

Q: Are all substitute parts RoHS3 compliant? A: Yes. M20-7872042 and 0015445866 are both RoHS3 compliant, matching the compliance status of M20-7873342.

Q: What is the current-carrying capacity difference between substitutes? A: M20-7873342 and M20-7872042 both support 3A per contact. 0015445866 supports 2.5A per contact. Applications with high current requirements should verify compatibility with the 2.5A rating.

Q: Can I use 0015445866 in place of M20-7873342 without PCB redesign? A: No. 0015445866 requires through-hole PCB design, while M20-7873342 is surface mount. PCB layout, hole placement, and assembly process modifications are necessary.

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