Amphenol ICC 55508-318 Rectangular Connector - Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 55508-318 is an 18-position receptacle connector from the Minitek® 2.00mm series, designed for board-to-board surface mount applications. This connector features a 0.079" (2.00mm) pitch with gold-plated mating contacts and push-pull fastening, rated for 2A at 200V in general purpose, industrial, and medical applications.

The 55508-318 carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this connector.

Key Parameters

Parameter	Value
Connector Type	Receptacle
Number of Positions	18
Pitch - Mating	0.079" (2.00mm)
Number of Rows	2
Row Spacing - Mating	0.079" (2.00mm)
Mounting Type	Surface Mount
Contact Type	Female Socket
Current Rating	2A
Voltage Rating	200V
Operating Temperature	-55°C ~ 125°C
Contact Finish - Mating	Gold
Material Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

Substitution eligibility for the 55508-318 is determined by strict equivalence across the following critical parameters:

Connector type (Receptacle)
Number of positions (18)
Pitch and row spacing (0.079" / 2.00mm)
Mounting type (Surface Mount)
Contact type (Female Socket)
Current and voltage ratings (2A / 200V)
Operating temperature range (-55°C ~ 125°C)
Contact finish on mating surface (Gold)
Flammability rating (UL94 V-0)
Series designation (Minitek® 2.00mm)

The substitute part 55508-318LF meets all these criteria. Differences in post contact finish (Tin-Lead vs. Tin) and product status (Obsolete vs. Active) do not affect functional interchangeability in the mating interface.

Parameter Comparison

Parameter	55508-318	55508-318LF	Match
Manufacturer	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Yes
Series	Minitek® 2.00mm	Minitek® 2.00mm	Yes
Connector Type	Receptacle	Receptacle	Yes
Number of Positions	18	18	Yes
Pitch - Mating	0.079" (2.00mm)	0.079" (2.00mm)	Yes
Number of Rows	2	2	Yes
Row Spacing - Mating	0.079" (2.00mm)	0.079" (2.00mm)	Yes
Mounting Type	Surface Mount	Surface Mount	Yes
Contact Type	Female Socket	Female Socket	Yes
Current Rating (Amps)	2A	2A	Yes
Voltage Rating	200V	200V	Yes
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	Yes
Contact Finish - Mating	Gold	Gold	Yes
Contact Finish Thickness - Mating	15.0µin (0.38µm)	15.0µin (0.38µm)	Yes
Insulation Color	Black	Black	Yes
Insulation Height	0.091" (2.30mm)	0.091" (2.30mm)	Yes
Material Flammability Rating	UL94 V-0	UL94 V-0	Yes
Contact Shape	Square	Square	Yes
Contact Material	Phosphor Bronze	Phosphor Bronze	Yes
Insulation Material	Plastic	Plastic	Yes
Product Status	Obsolete	Active	Different
RoHS Status	RoHS non-compliant	RoHS Compliant	Different
Contact Finish - Post	Tin-Lead	Tin	Different

Engineering Selection Recommendations

The 55508-318LF is a direct functional substitute for the 55508-318. Both connectors are electrically and mechanically equivalent across all mating interface parameters.

The 55508-318LF offers the advantage of active product status, ensuring ongoing availability and supply chain support. Additionally, the 55508-318LF is RoHS compliant, meeting current environmental and regulatory requirements for new designs and production environments subject to RoHS directives.

The post contact finish difference (Tin-Lead in the original vs. Tin in the substitute) does not affect mating interface performance. This difference applies only to the solder termination side and is compatible with standard PCB assembly processes.

Selection between these parts should be based on supply availability, regulatory compliance requirements, and production timeline considerations.

Frequently Asked Questions (FAQ)

Q: Can the 55508-318LF be used as a direct replacement for the 55508-318?

A: Yes. The 55508-318LF is functionally equivalent to the 55508-318 across all critical mating interface parameters, including connector type, position count, pitch, mounting type, contact type, current and voltage ratings, operating temperature range, and contact finish specifications.

Q: What is the significance of the product status difference (Obsolete vs. Active)?

A: The 55508-318 is obsolete, meaning it is no longer in active production. The 55508-318LF is active, indicating current manufacturing and availability. For new designs or ongoing production, the active status of the 55508-318LF provides supply chain continuity and support.

Q: Does the RoHS compliance difference affect compatibility?

A: No. RoHS compliance is a regulatory and environmental designation that does not affect the electrical or mechanical compatibility of the connector. The 55508-318LF's RoHS compliance status makes it suitable for applications and markets requiring RoHS-compliant components.

Q: What is the difference between Tin-Lead and Tin post contact finish?

A: Both finishes are suitable for solder termination. Tin-Lead (55508-318) is a traditional finish, while Tin (55508-318LF) is a lead-free alternative. This difference applies only to the solder joint interface and does not affect the mating connector interface performance.

Q: Are there any packaging differences between these parts?

A: The 55508-318 packaging is not specified in the available data. The 55508-318LF is supplied in Tube packaging. Confirm packaging requirements with your procurement or assembly process specifications.

Q: What applications are these connectors suitable for?

A: Both connectors are rated for General Purpose, Industrial, and Medical applications, with a 2A current rating at 200V and an operating temperature range of -55°C to 125°C.

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