Equivalent & Substitute Parts for 77311-122-20LF

Part Overview

The Amphenol ICC 77311-122-20LF is a rectangular connector header, vertical mount, 20-position, 2.54mm pitch, designed for through-hole board-to-board applications. This BERGSTIK® series connector features male pins with gold-plated mating contacts and tin-plated posts, rated for 3A per contact across an operating temperature range of -65°C to 125°C. The part is currently active in production and RoHS compliant.

Substitute parts are identified when equivalent electrical and mechanical parameters align with the main part's core specifications: 20-position configuration, 0.100" (2.54mm) pitch, through-hole mounting, solder termination, and compatible contact materials and finishes. Substitutes may be necessary due to supply constraints, design revisions, or application-specific requirements.

Key Parameters

Parameter	77311-122-20LF
Manufacturer	Amphenol ICC (FCI)
Series	BERGSTIK®
Connector Type	Header
Number of Positions	20
Pitch - Mating	0.100" (2.54mm)
Contact Type	Male Pin
Mounting Type	Through Hole
Termination	Solder
Current Rating	3A per Contact
Operating Temperature	-65°C ~ 125°C
Contact Finish - Mating	Gold or Gold, GXT™
Contact Material	Phosphor Bronze
Insulation Material	Thermoplastic
RoHS Status	RoHS Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the 77311-122-20LF is determined by the following core parameters:

Connector Configuration: 20-position, single-row header with 0.100" (2.54mm) pitch
Mounting and Termination: Through-hole solder termination
Contact Type: Male pins with compatible mating contact length and overall contact length within acceptable tolerance ranges
Electrical Performance: Current rating of 3A or greater per contact
Operating Temperature Range: Minimum -65°C to 125°C or equivalent
Contact Finish: Gold or tin-plated mating surfaces acceptable for board-to-board or board-to-cable applications
Compliance: RoHS compliant status

The following parts meet these substitution criteria:

7-146277-0 (TE Connectivity AMP Connectors, AMPMODU Mod II): Active product with matching pitch, position count, through-hole solder termination, 3A current rating, and RoHS compliance. Breakaway header variant compatible with board-to-board or cable applications.
2-826926-0 (TE Connectivity AMP Connectors, AMPMODU Mod II): Active product with matching pitch, position count, through-hole solder termination, 5A current rating (exceeds 3A requirement), and RoHS compliance. Breakaway header variant with enhanced current capacity.
2-644884-0 (TE Connectivity AMP Connectors, MTA-100): Obsolete product with matching pitch, position count, and through-hole solder termination. Current rating varies by wire gauge; mating contact length differs from main part. Suitable only where supply of active alternatives is unavailable.

Parameter Comparison

Parameter	77311-122-20LF	7-146277-0	2-826926-0	2-644884-0
Manufacturer	Amphenol ICC (FCI)	TE Connectivity AMP	TE Connectivity AMP	TE Connectivity AMP
Series	BERGSTIK®	AMPMODU Mod II	AMPMODU Mod II	MTA-100
Product Status	Active	Active	Active	Obsolete
Number of Positions	20	20	20	20
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder
Contact Length - Mating	0.305" (7.75mm)	0.318" (8.08mm)	0.264" (6.70mm)	0.295" (7.49mm)
Contact Length - Post	0.120" (3.05mm)	0.125" (3.18mm)	0.126" (3.20mm)	0.110" (2.79mm)
Overall Contact Length	0.525" (13.34mm)	0.533" (14.65mm)	0.500" (12.70mm)	0.505" (12.83mm)
Insulation Height	0.100" (2.54mm)	0.090" (2.29mm)	0.110" (2.79mm)	0.100" (2.54mm)
Contact Finish - Mating	Gold or Gold, GXT™	Gold	Tin	Gold
Contact Finish Thickness - Mating	30.0µin (0.76µm)	30.0µin (0.76µm)	78.7µin (2.00µm)	30.0µin (0.76µm)
Contact Material	Phosphor Bronze	Copper Alloy	Copper Alloy	Copper Alloy
Insulation Material	Thermoplastic	Liquid Crystal Polymer (LCP)	Polybutylene Terephthalate (PBT)	Thermoplastic
Current Rating	3A per Contact	3A	5A	Varies by Wire Gauge
Operating Temperature	-65°C ~ 125°C	-65°C ~ 105°C	-65°C ~ 105°C	-55°C ~ 105°C
RoHS Status	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant
Fastening Type	Push-Pull	Push-Pull	Push-Pull	Not Specified

Engineering Selection Recommendations

Primary Substitutes (Active Products)

7-146277-0 and 2-826926-0 are both active TE Connectivity products within the AMPMODU Mod II series. Both maintain the 20-position, 2.54mm pitch configuration and through-hole solder termination required for direct substitution. Both are RoHS compliant and rated for -65°C to 105°C operation.

7-146277-0 matches the 3A per contact current rating of the main part and provides equivalent electrical performance. Contact length specifications are within acceptable tolerance ranges for board-to-board and cable applications.

2-826926-0 provides enhanced current capacity at 5A per contact, exceeding the main part's 3A specification. This part is suitable for applications requiring higher current handling. Mating contact length is shorter (0.264" vs. 0.305"), which may affect mating depth in certain connector housings; verify mechanical compatibility before selection.

Secondary Substitute (Obsolete Product)

2-644884-0 is classified as obsolete and should be selected only when active alternatives are unavailable. The MTA-100 series shares the core 20-position, 2.54mm pitch configuration but exhibits differences in contact length and operating temperature range (-55°C to 105°C vs. -65°C to 125°C). Current rating specification varies by wire gauge, limiting direct electrical comparison. RoHS3 compliance is confirmed.

Compliance Considerations

All substitute parts maintain RoHS compliance status. The main part and active substitutes (7-146277-0, 2-826926-0) are rated for -65°C to 105°C operation, with the main part extending to 125°C. Applications requiring the full -65°C to 125°C range should prioritize the main part or verify thermal performance of substitutes in the specific application environment.

Frequently Asked Questions (FAQ)

Q: Can 7-146277-0 be used as a direct replacement for 77311-122-20LF?

A: Yes. Both parts share the same 20-position, 2.54mm pitch configuration, through-hole solder termination, and 3A per contact current rating. Contact length specifications are within acceptable tolerance ranges. The primary difference is the insulation material (LCP vs. Thermoplastic) and operating temperature upper limit (105°C vs. 125°C). Verify application temperature requirements before substitution.

Q: What is the difference between 2-826926-0 and 7-146277-0?

A: Both are AMPMODU Mod II series headers with matching pitch and position count. 2-826926-0 provides 5A per contact current capacity versus 3A for 7-146277-0, making it suitable for higher-current applications. Mating contact length differs (0.264" vs. 0.318"), which may affect mating depth. Insulation materials also differ (PBT vs. LCP). Select based on current requirements and mechanical compatibility with mating connectors.

Q: Why is 2-644884-0 listed as a substitute if it is obsolete?

A: 2-644884-0 is included because it shares the core 20-position, 2.54mm pitch configuration and through-hole solder termination. However, its obsolete status means supply is limited or unavailable. This part should be selected only when active alternatives cannot be sourced. Verify contact length compatibility with mating connectors, as specifications differ from the main part.

Q: Are all substitute parts RoHS compliant?

A: Yes. The main part (77311-122-20LF) and all listed substitutes (7-146277-0, 2-826926-0, 2-644884-0) are RoHS compliant or ROHS3 compliant, meeting environmental and regulatory requirements.

Q: What is the impact of different contact finish materials?

A: The main part features gold-plated mating contacts (30.0µin thickness). 7-146277-0 also uses gold finish with equivalent thickness. 2-826926-0 uses tin finish with greater thickness (78.7µin), which may affect contact resistance and wear characteristics. 2-644884-0 uses gold finish. Contact finish selection should align with mating connector specifications and application environment to ensure reliable electrical performance.

Q: Can these parts be used interchangeably in board-to-cable applications?

A: 7-146277-0 and 2-826926-0 are explicitly rated for board-to-board or cable applications. The main part (77311-122-20LF) is specified for board-to-board style. 2-644884-0 is specified for board-to-cable/wire style. Verify application requirements and mating connector compatibility before selecting a substitute for cable applications.

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