Amphenol ICC 77311-127-08LF Rectangular Connector - Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 77311-127-08LF is an active-status vertical header connector with 8 positions at 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 connector is RoHS compliant with UL94 V-0 flammability rating and unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility permits selection from alternative manufacturers offering compatible electrical and mechanical specifications within the allowed parameter tolerances.

Key Parameters

Parameter	77311-127-08LF
Manufacturer	Amphenol ICC (FCI)
Connector Type	Header
Contact Type	Male Pin
Number of Positions	8
Pitch - Mating	0.100" (2.54mm)
Number of Rows	1
Mounting Type	Through Hole
Termination	Solder
Contact Shape	Square
Insulation Material	Thermoplastic
Operating Temperature	-65°C ~ 125°C
Current Rating	3A per Contact
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS Compliant
MSL	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 77311-127-08LF is determined by strict alignment with the following core parameters:

Connector Type & Contact Configuration: Header with male pins, 8 positions, single row
Pitch Specification: 0.100" (2.54mm) mating pitch
Mounting & Termination: Through-hole solder termination
Contact Shape: Square profile
Electrical Performance: Current rating and operating temperature range
Compliance: RoHS compliance and UL94 V-0 flammability rating
Moisture Sensitivity: MSL 1 (Unlimited)

The four substitute parts listed below meet these core criteria with variations in contact finish specifications, insulation material composition, and contact length dimensions that remain within acceptable mechanical tolerances for board-to-board or board-to-cable interconnection applications.

Parameter Comparison

Parameter	77311-127-08LF (Main)	3-644456-8	3-644695-8	826926-8	929834-01-08-RK
Manufacturer	Amphenol ICC	TE Connectivity AMP	TE Connectivity AMP	TE Connectivity AMP	3M
Series	BERGSTIK®	MTA-100	MTA-100	AMPMODU Mod II	929
Connector Type	Header	Header	Header	Header, Breakaway	Header, Breakaway
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Number of Positions	8	8	8	8	8
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Number of Rows	1	1	1	1	1
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Kinked Pin, Solder	Solder	Solder
Contact Shape	Square	Square	Square	Square	Square
Contact Length - Mating	0.260" (6.60mm)	0.295" (7.49mm)	0.295" (7.49mm)	0.264" (6.70mm)	0.235" (5.97mm)
Contact Length - Post	0.105" (2.67mm)	0.110" (2.79mm)	0.110" (2.79mm)	0.126" (3.20mm)	0.110" (2.79mm)
Overall Contact Length	0.465" (11.81mm)	0.505" (12.83mm)	0.505" (12.83mm)	0.500" (12.70mm)	0.445" (11.30mm)
Insulation Height	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.110" (2.79mm)	0.100" (2.54mm)
Insulation Material	Thermoplastic	Thermoplastic	Thermoplastic	Polybutylene Terephthalate (PBT)	Polycyclohexylenedimethylene Terephthalate (PCT)
Contact Finish - Mating	Gold or Gold, GXT™	Tin	Tin	Tin	Tin
Contact Finish - Post	Tin	Tin	Tin	Tin	Tin
Contact Material	Phosphor Bronze	Copper Alloy	Copper Alloy	Copper Alloy	Copper Alloy
Operating Temperature	-65°C ~ 125°C	-55°C ~ 105°C	-55°C ~ 105°C	-65°C ~ 105°C	-40°C ~ 105°C
Current Rating	3A per Contact	Varies by Wire Gauge	Varies by Wire Gauge	5A	2.5A
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

3-644456-8 (TE Connectivity MTA-100 Series)

This substitute maintains full RoHS compliance and UL94 V-0 rating. The MTA-100 series is designed for board-to-cable/wire applications with tin-plated mating contacts. Operating temperature range is -55°C to 105°C, which is narrower than the main part. Current rating varies by wire gauge rather than fixed per-contact specification. This part is suitable for applications where the reduced temperature range and wire-gauge-dependent current rating are acceptable.

3-644695-8 (TE Connectivity MTA-100 Series with Kinked Pin)

This variant includes kinked pin termination in addition to solder termination, offering mechanical retention options. ROHS3 compliance and UL94 V-0 rating are maintained. Operating temperature and current rating specifications are identical to 3-644456-8. The kinked pin feature provides additional mechanical stability in board-mounted applications.

826926-8 (TE Connectivity AMPMODU Mod II Series)

This breakaway header offers 5A per contact current rating, exceeding the main part specification. Operating temperature range extends to -65°C at the lower limit, matching the main part. ROHS3 compliance and UL94 V-0 rating are maintained. Insulation material is PBT rather than thermoplastic, and insulation height is 0.110" (2.79mm) versus 0.100" (2.54mm) on the main part. This part is suitable for higher-current applications with board-to-board or cable interconnection flexibility.

929834-01-08-RK (3M Series 929)

This 3M breakaway header maintains RoHS compliance and UL94 V-0 rating. Operating temperature range is -40°C to 105°C, narrower than the main part at the lower limit. Current rating is 2.5A per contact, below the main part specification. Contact length for mating is 0.235" (5.97mm), the shortest among all substitutes. This part is suitable for space-constrained applications where the reduced current rating and narrower temperature range are acceptable.

Frequently Asked Questions (FAQ)

Q: Can I use these substitute parts interchangeably with the 77311-127-08LF?

A: Substitution depends on your specific application requirements. All listed parts share the same 8-position, 2.54mm pitch, through-hole solder termination, and square contact geometry. However, differences in operating temperature range, current rating, contact finish, and insulation material must be evaluated against your design specifications. The 77311-127-08LF operates from -65°C to 125°C with 3A per contact; substitute parts have narrower temperature ranges and varying current ratings.

Q: What is the difference between the contact finish specifications?

A: The main part features gold or gold GXT™ plating on mating contacts, which provides superior corrosion resistance and lower contact resistance. Substitute parts use tin plating on mating contacts, which is suitable for general-purpose applications but may exhibit higher contact resistance in low-signal applications. Contact finish thickness also varies across parts, affecting long-term reliability in corrosive environments.

Q: Why do some substitute parts have different insulation materials?

A: The main part uses thermoplastic insulation, while 826926-8 uses PBT and 929834-01-08-RK uses PCT. These materials offer different thermal stability, chemical resistance, and mechanical properties. PBT and PCT provide enhanced thermal performance and are suitable for higher-temperature applications, though the operating temperature range of these parts remains lower than the main part.

Q: What does "Breakaway" mean in the connector type?

A: Breakaway connectors feature individual contact positions that can be separated or removed from the main header body, allowing for modular configuration and reduced connector size when fewer positions are needed. The main part and 3-644456-8 are standard headers without breakaway capability, while 826926-8 and 929834-01-08-RK offer breakaway functionality.

Q: How do I determine which substitute is appropriate for my application?

A: Verify that the substitute part meets your minimum operating temperature range, current rating per contact, and any specific contact finish requirements. Confirm that the insulation material and flammability rating comply with your design standards. All listed parts maintain RoHS compliance and MSL 1 rating, suitable for standard PCB assembly processes.

Q: Are there any mechanical compatibility concerns with different contact lengths?

A: Contact length variations affect mating depth and overall connector height. The main part has an overall contact length of 0.465" (11.81mm), while substitutes range from 0.445" to 0.505". These differences may impact PCB layout, mating connector selection, and board-to-board spacing. Verify that your mating connector or cable assembly is compatible with the substitute part's contact geometry before implementation.

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