Molex 0873812018 Equivalent & Substitute Parts

Part Overview

The Molex 0873812018 is a 20-position receptacle connector from the Milli-Grid 87381 series, designed for surface mount board-to-board applications. This connector features 0.079" (2.00mm) pitch mating contacts with gold plating, push-pull fastening, and operates across -55°C to 105°C. The part is active in production and ROHS3 compliant. Substitute parts are identified when equivalent electrical and mechanical parameters align with application requirements, enabling component sourcing flexibility and supply chain continuity.

Key Parameters

Parameter	Value
Connector Type	Receptacle
Contact Type	Female Socket
Number of Positions	20
Pitch - Mating	0.079" (2.00mm)
Number of Rows	2
Row Spacing - Mating	0.079" (2.00mm)
Mounting Type	Surface Mount
Fastening Type	Push-Pull
Contact Finish - Mating	Gold
Termination	Solder
Operating Temperature Range	-55°C ~ 105°C
Current Rating	1.9A
Voltage Rating	125V
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the Molex 0873812018 are qualified based on the following critical parameters that determine functional interchangeability:

Connector Type & Contact Configuration: Receptacle with female socket contacts
Position Count & Pitch: 20 positions at 0.079" (2.00mm) mating pitch
Row Configuration: 2 rows with 0.079" (2.00mm) row spacing
Mounting & Termination: Surface mount with solder termination
Fastening Mechanism: Push-pull fastening
Contact Finish: Gold-plated mating contacts
Electrical Ratings: Voltage and current capacity suitable for the application
Compliance: ROHS3 compliance and regulatory alignment

The Hirose Electric A3 series receptacles (A3-20DA-2SV(71) and A3A-20DA-2SV(71)) meet these core substitution criteria. Both parts share identical mechanical pitch, position count, row configuration, surface mount design, and push-pull fastening. Differences in operating temperature range, current rating, and voltage rating must be evaluated against specific application requirements.

Parameter Comparison

Parameter	Molex 0873812018	Hirose A3-20DA-2SV(71)	Hirose A3A-20DA-2SV(71)
Manufacturer	Molex	Hirose Electric Co Ltd	Hirose Electric Co Ltd
Series	Milli-Grid 87381	A3	A3
Connector Type	Receptacle	Receptacle	Receptacle
Contact Type	Female Socket	Female Socket	Female Socket
Number of Positions	20	20	20
Pitch - Mating	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
Number of Rows	2	2	2
Row Spacing - Mating	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Termination	Solder	Solder	Solder
Fastening Type	Push-Pull	Push-Pull	Push-Pull
Contact Finish - Mating	Gold	Gold	Gold
Operating Temperature	-55°C ~ 105°C	-55°C ~ 85°C	-55°C ~ 85°C
Current Rating (Amps)	1.9A	1A	1A
Voltage Rating	125V	200VAC	200VAC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

Both Hirose A3 series substitutes are active production parts with ROHS3 compliance, matching the regulatory status of the Molex 0873812018. Selection between the main part and substitutes depends on application-specific electrical and thermal requirements:

The Molex 0873812018 supports higher operating temperatures (up to 105°C) and higher current capacity (1.9A at 125V), making it suitable for applications requiring extended thermal performance or higher current delivery per contact.

The Hirose A3-20DA-2SV(71) and A3A-20DA-2SV(71) operate to 85°C maximum with 1A current rating at 200VAC. The A3A-20DA-2SV(71) includes board guide features matching the Molex design. Both Hirose parts are suitable for general purpose and telecommunications applications where the reduced temperature range and current rating are acceptable.

All three parts share identical mechanical interfaces, pitch, position count, and fastening mechanisms, ensuring physical and electrical compatibility within their respective rated parameters.

Frequently Asked Questions (FAQ)

Q: Can the Hirose A3 series receptacles directly replace the Molex 0873812018 in all applications?

A: Direct replacement is possible only when application requirements fall within the Hirose parts' electrical and thermal specifications. The Hirose A3 series is rated to 85°C maximum and 1A per contact, compared to the Molex part's 105°C and 1.9A ratings. Applications operating above 85°C or requiring current exceeding 1A per contact require the Molex part.

Q: What are the key mechanical compatibility factors?

A: All three parts share identical mating pitch (0.079"), position count (20), row configuration (2 rows at 0.079" spacing), surface mount design, and push-pull fastening. Mechanical interchangeability is confirmed across all three parts.

Q: Are there differences between the two Hirose A3 substitute parts?

A: The A3A-20DA-2SV(71) includes board guide features, matching the Molex design. The A3-20DA-2SV(71) does not include this feature. Both share identical electrical ratings and operating temperature ranges. Selection depends on whether board guide functionality is required in the application.

Q: What compliance certifications apply to all three parts?

A: All parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. Moisture sensitivity level is 1 (unlimited) for all three parts.

Q: How do voltage ratings differ between the parts?

A: The Molex 0873812018 is rated 125V, while both Hirose A3 series parts are rated 200VAC. The higher Hirose voltage rating provides additional margin in lower-voltage applications but does not affect substitution eligibility when voltage requirements are met.

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