Amphenol ICC 77311-102-03 Rectangular Connector Header

Part Overview

The Amphenol ICC 77311-102-03 is a vertical through-hole rectangular connector header with 3 positions at 0.100" (2.54mm) pitch, designed for board-to-board applications. This connector features male pins with gold-plated mating contacts and tin-lead plated posts, rated for 3A per contact across an operating temperature range of -65°C to 125°C.

The 77311-102-03 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this connector series.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	3
Pitch - Mating	0.100" (2.54mm)
Number of Rows	1
Mounting Type	Through Hole
Termination	Solder
Contact Finish - Mating	Gold or Gold, GXT™
Contact Finish - Post	Tin-Lead
Current Rating	3A per Contact
Operating Temperature	-65°C ~ 125°C
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the 77311-102-03 is determined by the following critical parameters:

Primary Matching Criteria:

Connector type: Header
Contact type: Male Pin
Number of positions: 3
Pitch: 0.100" (2.54mm)
Mounting type: Through Hole
Termination: Solder
Style: Board to Board

Secondary Compatibility Factors:

Contact finish (mating surface): Gold or equivalent
Current rating: 3A per contact minimum
Operating temperature range: -65°C to 125°C or equivalent
Flammability rating: UL94 V-0

Substitute parts are grouped into two categories: direct equivalents from Amphenol ICC with identical electrical and mechanical specifications, and cross-manufacturer alternatives from Molex, 3M, and Samtec that meet the same functional requirements within the allowed parameter tolerances.

Parameter Comparison

Part Number	Manufacturer	Connector Type	Positions	Pitch	Contact Finish (Mating)	Contact Finish (Post)	Current Rating	Operating Temp	Product Status	RoHS Status
77311-102-03	Amphenol ICC	Header	3	0.100" (2.54mm)	Gold or Gold, GXT™	Tin-Lead	3A per Contact	-65°C ~ 125°C	Obsolete	RoHS non-compliant
77311-102-03LF	Amphenol ICC	Header	3	0.100" (2.54mm)	Gold or Gold, GXT™	Tin	3A per Contact	-65°C ~ 125°C	Active	RoHS Compliant
0423752522	Molex	Header, Breakaway	3	0.100" (2.54mm)	Gold	Tin	Not specified	Not specified	Active	ROHS3 Compliant
0423752487	Molex	Header, Breakaway	3	0.100" (2.54mm)	Gold	Tin	Not specified	Not specified	Active	ROHS3 Compliant
2303-6111-TB	3M	Header	3	0.100" (2.54mm)	Gold	Tin-Lead	3A	-55°C ~ 105°C	Active	RoHS non-compliant
2303-6111-TP	3M	Header	3	0.100" (2.54mm)	Tin-Lead	Tin-Lead	3A	-55°C ~ 105°C	Active	RoHS non-compliant
2303-6151-TB	3M	Header	3	0.100" (2.54mm)	Gold	Tin-Lead	3A	-55°C ~ 105°C	Active	RoHS non-compliant
TS-103-G-AA	Samtec Inc.	Header	3	0.100" (2.54mm)	Gold	Not specified	Not specified	Not specified	Active	ROHS3 Compliant
TS-103-G-A-1	Samtec Inc.	Header	3	0.100" (2.54mm)	Gold	Not specified	Not specified	Not specified	Active	ROHS3 Compliant
TS-103-T-A-1	Samtec Inc.	Header	3	0.100" (2.54mm)	Tin	Not specified	Not specified	Not specified	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: 77311-102-03LF

The Amphenol ICC 77311-102-03LF is the direct active equivalent of the obsolete 77311-102-03. This part maintains identical electrical and mechanical specifications, including 3-position 0.100" pitch header configuration, gold mating contact finish, and 3A per contact current rating. The primary difference is the post finish (tin versus tin-lead) and RoHS compliance status. The 77311-102-03LF is RoHS compliant and currently in active production with 3942 units in stock, making it the optimal choice for design continuity and supply chain stability.

Secondary Recommendations for RoHS Compliance Requirements:

For applications requiring ROHS3 compliance with active product status, the Molex 0423752522 and 0423752487 (KK254 series) provide functionally equivalent 3-position 0.100" pitch headers with gold mating contacts. Both parts are actively produced and available in bulk packaging. The Samtec TS-103-G-AA and TS-103-G-A-1 offer additional ROHS3-compliant alternatives with gold contact finishes and active product status.

Considerations for Temperature Range:

The 3M 2300 series headers (2303-6111-TB, 2303-6111-TP, 2303-6151-TB) operate within -55°C to 105°C, which is narrower than the original -65°C to 125°C specification. These parts are suitable only for applications where the reduced temperature range is acceptable.

RoHS Compliance Transition:

If the design currently uses the RoHS non-compliant 77311-102-03 and RoHS compliance is not mandated, the 77311-102-03LF provides a direct path to an active, compliant equivalent. For new designs or compliance-driven transitions, Molex KK254 series or Samtec TS series offer established alternatives with full ROHS3 certification.

Frequently Asked Questions (FAQ)

Q: Can the 77311-102-03LF directly replace the 77311-102-03?

A: Yes. The 77311-102-03LF is the active equivalent of the obsolete 77311-102-03. Both parts share identical connector type, position count, pitch, mounting method, and current rating. The post finish differs (tin versus tin-lead), but this does not affect electrical or mechanical compatibility in standard solder applications.

Q: What is the difference between the Amphenol 77311-102-03LF and the Molex 0423752522?

A: Both are 3-position 0.100" pitch headers with gold mating contacts and solder termination. The Molex part includes breakaway functionality and uses polyamide nylon insulation material, while the Amphenol uses thermoplastic insulation. Both are RoHS compliant and actively produced. Selection depends on packaging requirements and mechanical interface preferences.

Q: Are the 3M 2300 series headers suitable replacements?

A: The 3M 2303-6111-TB, 2303-6111-TP, and 2303-6151-TB match the 3-position 0.100" pitch configuration and current rating. However, their operating temperature range (-55°C to 105°C) is narrower than the original specification (-65°C to 125°C). These parts are suitable only if the application does not require the full temperature range.

Q: What does "RoHS non-compliant" mean for the original 77311-102-03?

A: The original part contains tin-lead solder or other materials restricted under RoHS directives. The 77311-102-03LF addresses this by using tin-only post finish and is certified RoHS compliant. For new designs or regulated applications, the LF variant is required.

Q: Can I use the Samtec TS-103 series as a direct replacement?

A: The Samtec TS-103-G-AA and TS-103-G-A-1 provide equivalent 3-position 0.100" pitch header functionality with gold contacts and ROHS3 compliance. These parts are suitable for applications where Samtec's mechanical interface and packaging are compatible with the design. Verify physical dimensions and contact specifications before substitution.

Q: What is the difference between TS-103-G-AA and TS-103-T-A-1?

A: Both are Samtec 3-position 0.100" pitch headers. The TS-103-G-AA features gold contact finish, while the TS-103-T-A-1 features tin contact finish. Selection depends on mating contact requirements and application specifications.

Q: Is the 89883-304LF a suitable substitute?

A: No. The 89883-304LF is an 8-position receptacle connector with right-angle mounting, fundamentally different from the 3-position vertical header configuration of the 77311-102-03. This part is not compatible.

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