Amphenol ICC 77315-818-21 Rectangular Connector - Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 77315-818-21 is a through-hole, right-angle rectangular connector header with 21 positions at 0.100" (2.54mm) pitch, designed for board-to-board applications. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing production support and design continuity. Substitute parts must maintain identical mechanical and electrical interface specifications to ensure direct compatibility in existing circuit board layouts.

Key Parameters

Parameter	Specification
Connector Type	Header, Breakaway
Contact Type	Male Pin
Number of Positions	21
Pitch - Mating	0.100" (2.54mm)
Mounting Type	Through Hole, Right Angle
Contact Length - Mating	0.230" (5.84mm)
Contact Length - Post	0.120" (3.05mm)
Insulation Height	0.094" (2.40mm)
Contact Shape	Square
Termination	Solder
Material Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

Substitution eligibility for the 77315-818-21 is determined by strict equivalence across the following critical parameters:

Connector geometry: 21-position, single-row configuration with 0.100" (2.54mm) pitch spacing
Mounting interface: Through-hole, right-angle orientation with identical contact post dimensions (0.120" length)
Mating interface: Male pin contacts with 0.230" mating length and square contact geometry
Termination method: Solder attachment to PCB
Insulation system: Thermoplastic material with UL94 V-0 flammability rating

The identified substitutes maintain these core parameters, enabling direct PCB footprint compatibility. Variations in contact finish specifications, operating temperature ranges, and compliance certifications do not affect mechanical or electrical interface compatibility for standard applications.

Parameter Comparison

Parameter	77315-818-21 (Main)	77315-818-21LF (Direct Substitute)	2321-5111-TG (Alternative)
Manufacturer	Amphenol ICC (FCI)	Amphenol ICC (FCI)	3M
Series	BERGSTIK®	BERGSTIK®	2300
Product Status	Obsolete	Active	Active
Number of Positions	21	21	21
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Mounting Type	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle
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)
Insulation Height	0.094" (2.40mm)	0.094" (2.40mm)	0.100" (2.54mm)
Contact Shape	Square	Square	Square
Termination	Solder	Solder	Solder
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	Non-compliant	Compliant	Non-compliant
Operating Temperature	Not specified	-65°C ~ 125°C	-55°C ~ 105°C
Current Rating	Not specified	3A per Contact	3A

Engineering Selection Recommendations

77315-818-21LF is the primary substitute for the obsolete 77315-818-21. Both components are manufactured by Amphenol ICC within the BERGSTIK® series and share identical mechanical specifications. The 77315-818-21LF is currently in active production status with RoHS compliance, making it the preferred choice for new designs and production continuity. The lead-free contact finish (indicated by the "LF" designation) and reduced contact finish thickness on the post (78.7µin versus 150.0µin) represent the primary technical differences, both of which are compatible with standard solder reflow processes.

2321-5111-TG from 3M provides an alternative cross-platform substitute. This connector maintains all critical mechanical interface parameters and operates within a defined temperature range (-55°C ~ 105°C). The insulation height specification differs by 0.006" (0.15mm), which may require verification against specific PCB layout constraints. The 2321-5111-TG is RoHS non-compliant, consistent with the original 77315-818-21 specification.

Selection between these substitutes should be based on supply chain availability, compliance requirements, and thermal operating conditions specific to the application.

Frequently Asked Questions (FAQ)

Q: Can the 77315-818-21LF be used as a direct replacement for the 77315-818-21 without PCB modification?

A: Yes. Both connectors share identical pitch (0.100"), position count (21), contact post length (0.120"), and mating contact length (0.230"). The PCB footprint remains unchanged. The lead-free contact finish of the 77315-818-21LF is compatible with standard solder attachment processes.

Q: What is the significance of the "LF" designation in the 77315-818-21LF part number?

A: The "LF" suffix indicates lead-free contact finish on the post termination. This designation reflects RoHS compliance and is compatible with modern manufacturing processes.

Q: Is the 2321-5111-TG insulation height difference (0.100" versus 0.094") a compatibility concern?

A: The insulation height difference of 0.006" (0.15mm) affects the overall connector profile above the PCB. Verification against specific board layout and mating connector clearance requirements is necessary before selection.

Q: What are the operating temperature differences between substitutes?

A: The 77315-818-21LF operates from -65°C to 125°C, while the 2321-5111-TG operates from -55°C to 105°C. Selection depends on the thermal requirements of the specific application.

Q: Are there current rating differences between the main part and substitutes?

A: The original 77315-818-21 does not specify a current rating. Both substitutes are rated at 3A per contact, providing defined electrical performance for design verification.

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