M20-7870942P Equivalent & Substitute Parts

Part Overview

The M20-7870942P is an 18-position rectangular receptacle connector manufactured by Harwin Inc., designed for board-to-board or cable applications with 0.100" (2.54mm) pitch spacing. This connector features surface mount solder termination, gold-plated mating contacts, and push-pull fastening. The product is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Connector Type	Receptacle, Bottom or Top Entry
Number of Positions	18
Pitch - Mating	0.100" (2.54mm)
Number of Rows	2
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Surface Mount
Termination	Solder
Fastening Type	Push-Pull
Contact Finish - Mating	Gold
Operating Temperature Range	-40°C ~ 105°C
Current Rating	3A
Voltage Rating	1000V
Insulation Material	Polyamide (PA6T), Nylon 6T
Contact Material	Phosphor Bronze
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

The SSM-109-L-DV from Samtec Inc. qualifies as a direct substitute based on the following critical parameters:

Matching Parameters:

18-position receptacle configuration
0.100" (2.54mm) mating pitch
2-row layout with 0.100" (2.54mm) row spacing
Surface mount solder termination
Push-pull fastening mechanism
Gold-plated mating contacts
Phosphor bronze contact material
Square contact geometry
Unlimited moisture sensitivity level (MSL 1)
Identical HTSUS and ECCN classifications

The SSM-109-L-DV maintains functional and mechanical compatibility with the M20-7870942P while offering enhanced electrical performance characteristics and active product status.

Parameter Comparison

Parameter	M20-7870942P (Harwin)	SSM-109-L-DV (Samtec)
Connector Type	Receptacle, Bottom or Top Entry	Receptacle, Pass Through
Number of Positions	18	18
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)
Number of Rows	2	2
Row Spacing - Mating	0.100" (2.54mm)	0.100" (2.54mm)
Mounting Type	Surface Mount	Surface Mount
Termination	Solder	Solder
Fastening Type	Push-Pull	Push-Pull
Contact Finish - Mating	Gold	Gold
Contact Finish Thickness - Mating	Not specified	10.0µin (0.25µm)
Insulation Color	Black	Black
Insulation Height	0.295" (7.50mm)	0.290" (7.37mm)
Operating Temperature Range	-40°C ~ 105°C	-55°C ~ 125°C
Current Rating	3A	5.2A per Contact
Voltage Rating	1000V	405VAC, 572VDC
Insulation Material	Polyamide (PA6T), Nylon 6T	Liquid Crystal Polymer (LCP)
Contact Material	Phosphor Bronze	Phosphor Bronze
Contact Shape	Square	Square
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active
RoHS Status	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

The SSM-109-L-DV is the appropriate substitute for the obsolete M20-7870942P based on the following factors:

Product Status: The M20-7870942P is classified as obsolete, whereas the SSM-109-L-DV maintains active product status with ongoing manufacturer support and availability.

Compliance & Certifications: The SSM-109-L-DV is ROHS3 compliant, providing regulatory alignment for modern applications. Both components share identical ECCN (EAR99) and HTSUS (8536.69.4040) classifications, ensuring consistent export and tariff treatment.

Electrical Performance: The SSM-109-L-DV exceeds the electrical specifications of the M20-7870942P, offering higher current capacity (5.2A per contact versus 3A) and an extended operating temperature range (-55°C ~ 125°C versus -40°C ~ 105°C). The voltage rating difference reflects different measurement standards and does not preclude substitution in applications rated for 1000V operation.

Mechanical Compatibility: Both connectors maintain identical mating pitch, row spacing, position count, and fastening mechanisms, ensuring direct mechanical interchangeability in existing designs.

Frequently Asked Questions (FAQ)

Q: Can the SSM-109-L-DV directly replace the M20-7870942P in existing designs?

A: Yes. Both connectors share identical mating pitch (0.100"), position count (18), row configuration (2 rows), row spacing (0.100"), mounting type (surface mount), termination method (solder), and fastening mechanism (push-pull). The SSM-109-L-DV is mechanically and functionally compatible.

Q: What is the difference between "Bottom or Top Entry" and "Pass Through" connector types?

A: These designations describe mating orientation capabilities. Both connector types accommodate the same mating interfaces and maintain compatibility with standard 0.100" pitch headers and plugs used in board-to-board and cable applications.

Q: Are there any electrical limitations when substituting the SSM-109-L-DV?

A: No. The SSM-109-L-DV meets or exceeds all electrical requirements of the M20-7870942P. The higher current rating (5.2A per contact) and extended temperature range provide additional design margin.

Q: Does the insulation material change affect compatibility?

A: No. The SSM-109-L-DV uses Liquid Crystal Polymer (LCP) insulation instead of Polyamide (PA6T), which provides equivalent electrical and mechanical performance for this connector category. Both materials are rated MSL 1 (unlimited moisture sensitivity).

Q: What is the significance of the RoHS3 compliance on the SSM-109-L-DV?

A: RoHS3 compliance indicates the SSM-109-L-DV meets current European Union restrictions on hazardous substances. This is relevant for applications subject to RoHS regulations or for manufacturers requiring compliant component sourcing.

Q: Are there any packaging or inventory considerations?

A: The M20-7870942P is available in 1157 pieces (new original stock). The SSM-109-L-DV is supplied in bulk packaging with 1154 pieces in inventory. Both components maintain MSL 1 rating, requiring no special moisture control during storage or handling.

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