Amphenol ICC 77311-822-28LF Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 77311-822-28LF is an active rectangular connector header designed for through-hole board-to-board applications. This unshrouded, 28-position connector operates at 0.100" (2.54mm) pitch and is part of the BERGSTIK® series. The 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. Finding equivalent substitute parts is necessary to ensure design flexibility, manage supply chain continuity, and maintain compatibility across manufacturing batches.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Pitch - Mating	0.100" (2.54mm)
Number of Positions	28
Number of Rows	1
Mounting Type	Through Hole
Termination	Solder
Fastening Type	Push-Pull
Shrouding	Unshrouded
Contact Material	Phosphor Bronze
Insulation Material	Thermoplastic
Operating Temperature	-65°C ~ 125°C
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the Amphenol ICC 77311-822-28LF with the Samtec Inc. TSW-128-24-G-S is based on the following critical parameters that must align for functional equivalence:

Matching Parameters:

Connector type: Header
Contact type: Male pin
Pitch - mating: 0.100" (2.54mm)
Number of positions: 28
Number of rows: 1
Mounting type: Through hole
Termination: Solder
Fastening type: Push-pull
Shrouding: Unshrouded
Contact material: Phosphor bronze
Insulation material: Thermoplastic (PBT variant)
Material flammability rating: UL94 V-0
Moisture sensitivity level: 1 (Unlimited)
ECCN classification: EAR99

The TSW-128-24-G-S maintains electrical and mechanical compatibility through identical pitch spacing, position count, and contact configuration. Both connectors support board-to-board applications with solder termination and push-pull fastening.

Parameter Comparison

Parameter	77311-822-28LF (Amphenol ICC)	TSW-128-24-G-S (Samtec Inc.)
Connector Type	Header	Header
Contact Type	Male Pin	Male Pin
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)
Number of Positions	28	28
Number of Rows	1	1
Mounting Type	Through Hole	Through Hole
Termination	Solder	Solder
Fastening Type	Push-Pull	Push-Pull
Shrouding	Unshrouded	Unshrouded
Contact Shape	Square	Square
Contact Material	Phosphor Bronze	Phosphor Bronze
Insulation Material	Thermoplastic	Polybutylene Terephthalate (PBT)
Insulation Height	0.100" (2.54mm)	0.100" (2.54mm)
Contact Finish - Mating	Gold or Gold, GXT™	Gold
Contact Finish - Post	Tin	Gold
Operating Temperature	-65°C ~ 125°C	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0	UL94 V-0
Insulation Color	Black	Black
RoHS Status	RoHS Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99
HTSUS	8536.69.4040	8536.69.4040

Engineering Selection Recommendations

Both the Amphenol ICC 77311-822-28LF and Samtec Inc. TSW-128-24-G-S are active products with full RoHS compliance. The 77311-822-28LF maintains RoHS Compliant status, while the TSW-128-24-G-S meets ROHS3 Compliant requirements, indicating alignment with current regulatory standards.

Key differences in physical dimensions exist: the 77311-822-28LF has a contact length of 0.305" (7.75mm) mating and 0.120" (3.05mm) post length, while the TSW-128-24-G-S measures 0.265" (6.73mm) mating and 0.115" (2.92mm) post length. These dimensional variations may affect board layout and mating depth considerations.

The operating temperature range differs slightly: the 77311-822-28LF operates from -65°C to 125°C, while the TSW-128-24-G-S operates from -55°C to 125°C. Applications requiring operation below -55°C must use the Amphenol ICC part.

Contact finish specifications differ: the 77311-822-28LF uses gold-plated mating contacts with tin-plated posts, while the TSW-128-24-G-S uses gold plating on both mating and post surfaces. This affects solderability and long-term reliability characteristics.

Frequently Asked Questions (FAQ)

Q: Can the TSW-128-24-G-S directly replace the 77311-822-28LF in existing designs?

A: Direct replacement requires verification of physical dimensions and contact depth. The TSW-128-24-G-S has shorter overall contact length (0.480" vs. 0.525"), which may affect mating depth and board spacing. Confirm PCB layout compatibility before substitution.

Q: What is the significance of the different contact finish specifications?

A: The 77311-822-28LF uses tin-plated posts, while the TSW-128-24-G-S uses gold-plated posts. Gold plating on posts provides enhanced corrosion resistance and solderability. Tin plating is standard for wave soldering applications. Selection depends on assembly process and environmental exposure requirements.

Q: Are both connectors suitable for high-temperature applications?

A: Both connectors operate to 125°C maximum. The 77311-822-28LF extends to -65°C minimum, while the TSW-128-24-G-S operates to -55°C minimum. For applications below -55°C, the Amphenol ICC part is required.

Q: What packaging differences exist between these parts?

A: The 77311-822-28LF is supplied in bag packaging, while the TSW-128-24-G-S is supplied in bulk packaging. This affects handling, storage, and inventory management but does not impact electrical or mechanical performance.

Q: Do both parts meet current regulatory compliance standards?

A: Yes. The 77311-822-28LF is RoHS Compliant, and the TSW-128-24-G-S is ROHS3 Compliant. Both are REACH Affected and classified as EAR99 for export control purposes. Both carry UL94 V-0 flammability ratings.

Q: What is the current rating difference between these connectors?

A: The 77311-822-28LF specifies 3A per contact. The TSW-128-24-G-S does not provide a current rating specification in the available data. Confirm current requirements with the manufacturer before substitution in high-current applications.

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