Amphenol ICC 79257-550H Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 79257-550H is a rectangular connector header from the BERGSTIK® II series, designed for through-hole, right-angle board-to-board applications with 50 positions at 0.100" (2.54mm) pitch. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The connector features male pins with gold-plated mating contacts, phosphor bronze contact material, and UL94 V-0 flammability rating. Substitute parts must maintain electrical and mechanical compatibility while meeting current availability and compliance requirements.

Substiute Parts

79257-550H

Amphenol ICC (FCI)In Stock: 85279257-550H Datasheet

Current PartRFQ

2350-5121TB

3MIn Stock: 9342350-5121TB Datasheet

MFR RecommendedRFQ

2350-5121TG

3MIn Stock: 9192350-5121TG Datasheet

MFR RecommendedRFQ

PBC25DGAN

Sullins Connector SolutionsIn Stock: 826PBC25DGAN Datasheet

MFR RecommendedRFQ

PEC25DGBN

Sullins Connector SolutionsIn Stock: 1132PEC25DGBN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 79257-550H is determined by strict alignment of the following critical parameters:

• Connector type (Header)
• Contact type (Male Pin)
• Pitch - mating (0.100" / 2.54mm)
• Number of positions (50)
• Number of rows (2)
• Row spacing - mating (0.100" / 2.54mm)
• Mounting type (Through Hole, Right Angle)
• Termination (Solder)
• Contact shape (Square)
• Flammability rating (UL94 V-0)

All identified substitute parts meet these core electrical and mechanical requirements. Variations in contact length, contact finish, contact material, insulation material, and operating temperature ranges are secondary parameters that do not prevent functional substitution but may require design validation depending on application constraints.

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts maintain functional compatibility with the 79257-550H based on core electrical and mechanical parameters. Selection should prioritize product status and compliance requirements:

3M 2350-5121TB and 2350-5121TG are active products from an established connector manufacturer with UL94 V-0 certification. Both maintain the original contact length specification (0.230" / 5.84mm) and gold mating contact finish. These parts are suitable for applications requiring direct dimensional compatibility with the original design. Both are RoHS non-compliant, matching the original part status.

Sullins Connector Solutions PBC25DGAN and PEC25DGBN are active products with ROHS3 compliance, addressing regulatory requirements for new designs. Both feature extended mating contact length (0.318" / 8.08mm) and wider operating temperature range (-65°C ~ 125°C). PBC25DGAN maintains gold mating contact finish, while PEC25DGBN uses tin finish. The breakaway connector feature provides additional design flexibility. These parts are suitable for applications where RoHS compliance is mandatory.

Product status and compliance alignment should drive selection: use 3M parts for legacy system support requiring dimensional equivalence, or Sullins parts for new designs requiring RoHS compliance.

Frequently Asked Questions (FAQ)

Q: Can the Sullins parts with longer mating contact length (0.318" vs 0.230") be used as direct replacements?

A: Longer mating contact length does not prevent substitution. The contact length determines how far the pin extends into the mating receptacle. Longer contacts provide greater engagement depth and are compatible with standard 0.100" pitch receptacles. Design validation is required only if the application has specific spatial constraints or receptacle depth limitations.

Q: What is the difference between the two 3M substitute parts (2350-5121TB and 2350-5121TG)?

A: Both parts are identical in electrical and mechanical specifications. The difference is in contact finish thickness on the mating surface: 2350-5121TB has 30.0µin (0.76µm) gold plating, while 2350-5121TG has 10.0µin (0.25µm) gold plating. Both meet functional requirements; selection depends on application corrosion resistance needs.

Q: Why do the Sullins parts have "Breakaway" designation?

A: Breakaway connectors allow individual pins or rows to be separated from the main header assembly. This feature does not affect compatibility with standard receptacles and provides additional design flexibility for applications requiring modular configurations.

Q: Are the RoHS non-compliant 3M parts acceptable for new designs?

A: RoHS compliance is a regulatory requirement determined by application jurisdiction and customer specifications. For new designs subject to RoHS requirements, use ROHS3-compliant Sullins parts (PBC25DGAN or PEC25DGBN). For legacy system support or applications without RoHS mandates, 3M parts are acceptable.

Q: What is the significance of contact material differences (Phosphor Bronze vs Copper Alloy)?

A: Both materials are standard for connector applications. Phosphor bronze (used in the original part and Sullins substitutes) offers slightly higher spring force and wear resistance. Copper alloy (used in 3M substitutes) provides good electrical conductivity and cost efficiency. Both are functionally equivalent for standard board-to-board applications.

Q: Can PEC25DGBN with tin mating finish replace the original gold-plated part?

A: Tin finish is suitable for most applications but offers lower corrosion resistance than gold in high-humidity or corrosive environments. Use PEC25DGBN only if the application environment does not require extended corrosion protection. For equivalent corrosion performance, use PBC25DGAN (gold finish) or 3M parts.