Amphenol ICC 55510-342 Rectangular Connector – Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 55510-342 is a 42-position receptacle connector with 0.079" (2.00mm) pitch, designed for surface mount board-to-board applications. This connector features gold-plated mating contacts, push-pull fastening, and operates across -55°C to 125°C. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Active alternatives from Amphenol ICC and cross-manufacturer options are available with compatible electrical and mechanical specifications.

Key Parameters

Parameter	Specification
Connector Type	Receptacle
Number of Positions	42
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
Operating Temperature	-55°C ~ 125°C
Current Rating	2A
Voltage Rating	200V
Insulation Material	Plastic
Contact Material	Phosphor Bronze

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following core parameters: connector type (receptacle), number of positions (42), mating pitch (0.079"/2.00mm), row configuration (2 rows with 0.079" spacing), mounting type (surface mount), fastening mechanism (push-pull), contact material (phosphor bronze), and operating temperature range (-55°C to 125°C).

Direct Amphenol ICC Substitute: The 55510-342LF maintains identical mechanical and electrical specifications as the main part, with the primary difference being RoHS compliance status (compliant vs. non-compliant) and contact finish post material (tin vs. tin-lead).

Molex Milli-Grid 79109 Series Substitutes: Parts 0791091020, 0791091070, 0791091220, 0791091270, 0791098420, 0791098470, 0791098620, and 0791098670 share the same connector type, position count, pitch, row configuration, and surface mount design. These parts differ in contact finish thickness (15.0µin or 30.0µin), insulation material composition (liquid crystal polymer or thermoplastic, glass-filled), and optional features (board guide, pick-and-place compatibility). Current rating is reduced to 1A and voltage rating to 125V compared to the main part.

Samtec MMS Series Substitute: Part MMS-121-02-L-DV-A matches the core mechanical interface (42 positions, 0.079" pitch, 2-row configuration, surface mount, push-pull fastening) with a higher current rating of 3.9A per contact. Insulation material is liquid crystal polymer without glass filling.

Parameter Comparison

Parameter	55510-342 (Main)	55510-342LF	0791091020	0791091070	0791091220	0791091270	0791098420	0791098470	0791098620	0791098670	MMS-121-02-L-DV-A
Manufacturer	Amphenol ICC	Amphenol ICC	Molex	Molex	Molex	Molex	Molex	Molex	Molex	Molex	Samtec
Connector Type	Receptacle	Receptacle	Receptacle	Receptacle	Receptacle	Receptacle	Receptacle	Receptacle	Receptacle	Receptacle	Receptacle
Number of Positions	42	42	42	42	42	42	42	42	42	42	42
Pitch - Mating	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
Number of Rows	2	2	2	2	2	2	2	2	2	2	2
Row Spacing - Mating	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Contact Finish - Mating	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold
Contact Finish Thickness - Mating	15.0µin (0.38µm)	15.0µin (0.38µm)	15.0µin (0.38µm)	30.0µin (0.76µm)	15.0µin (0.38µm)	30.0µin (0.76µm)	15.0µin (0.38µm)	30.0µin (0.76µm)	15.0µin (0.38µm)	30.0µin (0.76µm)	10.0µin (0.25µm)
Insulation Color	Black	Black	Black	Black	Black	Black	Black	Black	Black	Black	Black
Insulation Height	0.177" (4.50mm)	0.177" (4.50mm)	0.175" (4.45mm)	0.175" (4.45mm)	0.175" (4.45mm)	0.175" (4.45mm)	0.175" (4.45mm)	0.175" (4.45mm)	0.175" (4.45mm)	0.175" (4.45mm)	0.177" (4.50mm)
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Current Rating	2A	2A	1A	1A	1A	1A	1A	1A	1A	1A	3.9A per Contact
Voltage Rating	200V	200V	125V	125V	125V	125V	125V	125V	125V	125V	—
Contact Material	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Insulation Material	Plastic	Plastic	Liquid Crystal Polymer (LCP), Glass Filled	Liquid Crystal Polymer (LCP), Glass Filled	Thermoplastic, Glass Filled	Thermoplastic, Glass Filled	Liquid Crystal Polymer (LCP), Glass Filled	Liquid Crystal Polymer (LCP), Glass Filled	Thermoplastic, Glass Filled	Thermoplastic, Glass Filled	Liquid Crystal Polymer (LCP)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute – Amphenol ICC 55510-342LF: This part is the direct successor to the obsolete 55510-342. It maintains identical mechanical and electrical specifications while achieving RoHS compliance. The contact finish post material differs (tin vs. tin-lead), but this does not affect mating interface compatibility. This option is recommended for applications requiring minimal design changes and continued support from the original manufacturer.

Alternative – Molex Milli-Grid 79109 Series: The Molex options (0791091020, 0791091070, 0791091220, 0791091270, 0791098420, 0791098470, 0791098620, 0791098670) provide cross-manufacturer compatibility with identical mechanical interfaces. These parts are ROHS3 compliant and active in production. Selection within this series depends on application requirements: parts with 15.0µin gold finish thickness match the main part specification, while 30.0µin variants provide enhanced durability. Board guide and pick-and-place features are available in specific variants. Current rating is reduced to 1A and voltage rating to 125V; applications exceeding these electrical limits require the Amphenol or Samtec alternatives.

High-Current Alternative – Samtec MMS-121-02-L-DV-A: This part accommodates higher current requirements (3.9A per contact) while maintaining the same mechanical interface. It is ROHS3 compliant and active. Insulation material is liquid crystal polymer without glass filling. This option is suitable for applications requiring elevated current capacity within the same form factor.

Frequently Asked Questions (FAQ)

Q: Can I use the Molex Milli-Grid 79109 series parts as direct replacements for the Amphenol 55510-342?

A: Mechanical compatibility is confirmed. The 42-position receptacle configuration, 0.079" pitch, 2-row layout, surface mount design, and push-pull fastening are identical. However, electrical ratings differ: Molex parts are rated 1A at 125V compared to the Amphenol part's 2A at 200V. Substitution is valid only if your application operates within the lower electrical limits.

Q: What is the difference between the Molex variants with 15.0µin and 30.0µin gold finish thickness?

A: Both thicknesses provide gold mating contact finish. The 30.0µin thickness offers increased durability and wear resistance for applications with frequent mating cycles. The 15.0µin thickness matches the original Amphenol specification. Selection depends on expected connector lifecycle and environmental exposure.

Q: Are board guide and pick-and-place features compatible with my existing PCB design?

A: Board guide and pick-and-place features are mechanical enhancements that do not affect electrical or basic mechanical compatibility. If your PCB design does not accommodate these features, select Molex variants without them (0791091020, 0791091070). If your assembly process benefits from these features, variants 0791091220, 0791091270, 0791098620, and 0791098670 are available.

Q: Why does the Samtec MMS-121-02-L-DV-A have a higher current rating?

A: The Samtec part is rated 3.9A per contact due to its contact design and material composition. This higher rating does not affect mechanical compatibility but provides additional electrical capacity for power-intensive applications.

Q: Is the 0.002" (0.05mm) difference in insulation height between the Amphenol and Molex parts significant?

A: The Amphenol 55510-342 and 55510-342LF have 0.177" (4.50mm) insulation height, while Molex Milli-Grid parts have 0.175" (4.45mm). This 0.002" difference is within typical PCB design tolerances and does not affect mechanical mating or electrical performance. Verify your PCB layout accommodates this minor variation if height-critical applications are involved.

Q: What is the difference between RoHS and ROHS3 compliance?

A: RoHS (Restriction of Hazardous Substances) compliance restricts specific hazardous materials. ROHS3 is the current EU directive version with updated substance restrictions. Both indicate compliance with hazardous substance regulations. The Amphenol 55510-342LF is RoHS compliant, while Molex and Samtec parts are ROHS3 compliant. Both are acceptable for regulated applications.

Q: Can I mix Amphenol and Molex connectors in the same assembly?

A: Mechanical and electrical compatibility is confirmed for mating interfaces. However, mixing manufacturers in a single assembly may complicate supply chain management and technical support. Standardizing on a single manufacturer or pre-qualified cross-manufacturer pair is recommended for production consistency.

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