Amphenol ICC 78276-404 Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 78276-404 is a rectangular connector header, right-angle configuration, with 4 positions at 2.54mm pitch. This through-hole, board-to-board connector is part of the BERGSTIK® II series and is currently in active production status with 1038 units in stock. Substitute parts are identified when equivalent electrical and mechanical parameters align with the original specification, enabling component interchangeability in applications where the primary part becomes unavailable or when design requirements necessitate alternative sourcing.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Pitch - Mating	0.100" (2.54mm)
Number of Positions	4
Number of Rows	2
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole, Right Angle
Style	Board to Board
Shrouding	Unshrouded
Contact Shape	Square
Material Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

Substitute parts for the 78276-404 are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Connector Type: Header
Contact Type: Male Pin
Pitch - Mating: 0.100" (2.54mm)
Number of Positions: 4
Number of Rows: 2
Row Spacing - Mating: 0.100" (2.54mm)
Mounting Type: Through Hole, Right Angle
Style: Board to Board or Board to Board/Cable
Shrouding: Unshrouded
Contact Shape: Square
Material Flammability Rating: UL94 V-0

The Samtec Inc. HTSW series parts (HTSW-102-25-L-D-RA and HTSW-102-30-L-D-RA) meet all critical mating and mechanical parameters. Differences in contact post length and insulation material do not affect mating compatibility with standard receptacles designed for 2.54mm pitch, 4-position headers.

Parameter Comparison

Parameter	78276-404 (Amphenol ICC)	HTSW-102-25-L-D-RA (Samtec)	HTSW-102-30-L-D-RA (Samtec)
Manufacturer	Amphenol ICC (FCI)	Samtec Inc.	Samtec Inc.
Connector Type	Header	Header	Header
Contact Type	Male Pin	Male Pin	Male Pin
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Number of Positions	4	4	4
Number of Rows	2	2	2
Row Spacing - 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
Style	Board to Board	Board to Board or Cable	Board to Board or Cable
Shrouding	Unshrouded	Unshrouded	Unshrouded
Contact Shape	Square	Square	Square
Contact Length - Mating	0.318" (8.08mm)	0.320" (8.13mm)	0.320" (8.13mm)
Contact Length - Post	0.120" (3.05mm)	0.100" (2.54mm)	0.600" (15.24mm)
Insulation Height	0.190" (4.83mm)	0.240" (6.10mm)	0.240" (6.10mm)
Contact Finish - Mating	Tin	Gold	Gold
Contact Material	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0
Product Status	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory	1038 Pcs	1770 Pcs	724 Pcs

Engineering Selection Recommendations

Both Samtec HTSW series parts are active production components with ROHS3 compliance, providing regulatory advantage over the RoHS non-compliant 78276-404. The HTSW-102-25-L-D-RA and HTSW-102-30-L-D-RA differ only in contact post length, which is a termination characteristic that does not affect mating interface compatibility.

Selection between the two Samtec substitutes depends on PCB stack-up and solder joint requirements. The HTSW-102-25-L-D-RA provides a shorter post length (0.100"), suitable for standard PCB thicknesses. The HTSW-102-30-L-D-RA provides an extended post length (0.600"), accommodating thicker PCB assemblies or applications requiring deeper solder penetration.

Both substitutes maintain the critical mating parameters: 2.54mm pitch, 4-position, 2-row configuration, square contact geometry, and UL94 V-0 flammability rating. The gold mating finish on Samtec parts provides enhanced contact reliability compared to the tin finish on the original part.

Frequently Asked Questions (FAQ)

Q: Can HTSW-102-25-L-D-RA and HTSW-102-30-L-D-RA be used interchangeably with 78276-404?

A: Yes, for mating interface compatibility. Both Samtec parts maintain identical pitch (2.54mm), position count (4), row configuration (2), and contact geometry (square). The difference in contact post length affects only the termination side and does not impact receptacle mating.

Q: What is the significance of the different contact post lengths?

A: Contact post length determines solder joint depth and is selected based on PCB thickness. HTSW-102-25-L-D-RA (0.100" post) is standard for typical PCB assemblies. HTSW-102-30-L-D-RA (0.600" post) accommodates thicker PCBs or applications requiring extended solder joint engagement.

Q: Why do the Samtec parts have gold mating finish while the original has tin?

A: Gold plating provides superior corrosion resistance and contact reliability. This is a material upgrade that does not affect electrical or mechanical compatibility.

Q: Are there compliance differences between these parts?

A: Yes. The 78276-404 is RoHS non-compliant, while both Samtec substitutes are ROHS3 compliant. For new designs or applications with RoHS requirements, the Samtec parts are the appropriate selection.

Q: What is the impact of different insulation heights?

A: Insulation height (0.190" for 78276-404 vs. 0.240" for HTSW series) affects board-to-board spacing and clearance to adjacent components. Verify PCB layout clearances before substitution in space-constrained applications.

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