Amphenol ICC 77311-118-21 Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 77311-118-21 is a through-hole rectangular connector header with 21 positions at 2.54mm pitch, designed for board-to-board applications. This part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing system support and new design implementations. The BERGSTIK® series connector provides a standard interface for applications requiring reliable male pin headers with solder termination.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	21
Pitch - Mating	0.100" (2.54mm)
Number of Rows	1
Mounting Type	Through Hole
Termination	Solder
Style	Board to Board
Shrouding	Unshrouded
Contact Material	Phosphor Bronze
Insulation Material	Thermoplastic
Material Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

Substitution eligibility for the 77311-118-21 is determined by strict equivalence across the following critical parameters:

Connector type (Header)
Contact type (Male Pin)
Number of positions (21)
Pitch specification (0.100" / 2.54mm)
Number of rows (1)
Mounting type (Through Hole)
Termination method (Solder)
Style (Board to Board)
Shrouding configuration (Unshrouded)
Contact shape (Square)
Insulation height (0.100" / 2.54mm)
Overall contact length (0.450" / 11.43mm)

The identified substitutes maintain these core parameters while varying in secondary attributes such as contact finish composition, RoHS compliance status, and operating temperature ranges.

Parameter Comparison

Parameter	77311-118-21	77311-118-21LF	2321-6111-TG
Manufacturer	Amphenol ICC (FCI)	Amphenol ICC (FCI)	3M
Product Status	Obsolete	Active	Active
Connector Type	Header	Header	Header
Contact Type	Male Pin	Male Pin	Male Pin
Number of Positions	21	21	21
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Number of Rows	1	1	1
Mounting Type	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder
Style	Board to Board	Board to Board	Board to Board or Cable
Shrouding	Unshrouded	Unshrouded	Unshrouded
Contact Shape	Square	Square	Square
Contact Length - Mating	0.230" (5.84mm)	0.230" (5.84mm)	0.230" (5.84mm)
Contact Length - Post	0.120" (3.05mm)	0.120" (3.05mm)	0.120" (3.05mm)
Overall Contact Length	0.450" (11.43mm)	0.450" (11.43mm)	0.450" (11.43mm)
Insulation Height	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Contact Material	Phosphor Bronze	Phosphor Bronze	Copper Alloy
Insulation Material	Thermoplastic	Thermoplastic	Thermoplastic, Glass Filled
Contact Finish - Mating	Gold or Gold, GXT™	Gold or Gold, GXT™	Gold
Contact Finish - Post	Tin-Lead	Tin	Tin-Lead
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0
Insulation Color	Black	Black	Black
Current Rating (Amps)	Not specified	3A per Contact	3A
Operating Temperature	Not specified	-65°C ~ 125°C	-55°C ~ 105°C
RoHS Status	RoHS non-compliant	RoHS Compliant	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Affected	REACH Affected

Engineering Selection Recommendations

The 77311-118-21LF represents the direct manufacturer equivalent from Amphenol ICC (FCI), maintaining identical mechanical and electrical specifications while offering active product status and RoHS compliance. This part is the primary substitute for obsolete 77311-118-21 applications.

The 2321-6111-TG from 3M provides cross-manufacturer compatibility with equivalent mechanical dimensions and contact configuration. This option supports board-to-board or cable applications and maintains UL94 V-0 flammability rating. The 2321-6111-TG operates across a narrower temperature range (-55°C to 105°C) compared to the 77311-118-21LF (-65°C to 125°C), requiring thermal environment verification for applications at temperature extremes.

For new designs or systems requiring regulatory compliance, the 77311-118-21LF is specified due to active product status and RoHS compliance. For legacy system maintenance where the original 77311-118-21 is unavailable, both 77311-118-21LF and 2321-6111-TG provide functional equivalence within their respective operating parameters.

Frequently Asked Questions (FAQ)

Q: Can the 77311-118-21LF directly replace the obsolete 77311-118-21?

A: Yes. The 77311-118-21LF maintains identical mechanical and electrical specifications including connector type, position count, pitch, mounting configuration, and contact geometry. The primary differences are RoHS compliance status and active product availability.

Q: What are the key differences between the Amphenol ICC and 3M substitutes?

A: Both maintain the 21-position, 2.54mm pitch header configuration. The 77311-118-21LF uses Phosphor Bronze contacts with Tin finish on posts, while the 2321-6111-TG uses Copper Alloy contacts with Tin-Lead finish. Operating temperature ranges differ: 77311-118-21LF operates -65°C to 125°C; 2321-6111-TG operates -55°C to 105°C. The 2321-6111-TG supports both board-to-board and cable applications.

Q: Are there packaging considerations for these substitutes?

A: The 77311-118-21LF is supplied in bulk packaging. The original 77311-118-21 packaging specification was not provided. Verify packaging requirements for your procurement process.

Q: Which substitute is recommended for new designs?

A: The 77311-118-21LF is recommended for new designs due to active product status, RoHS compliance, and extended operating temperature range. The 2321-6111-TG is suitable where cross-manufacturer sourcing or cable application capability is required.

Q: Do these parts require any design modifications for substitution?

A: No design modifications are required. All three parts maintain identical mechanical dimensions, contact spacing, and solder termination specifications, enabling direct board-level substitution.

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