TE Connectivity AMP Connectors 521755-4 Equivalent & Substitute Parts

Part Overview

The TE Connectivity AMP Connectors 521755-4 is a rectangular connector header designed for through-hole mounting applications. This connector features a vertical 4-position configuration with 0.197" (5.00mm) pitch spacing, suitable for board-to-cable/wire connections in general-purpose applications. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair requirements.

Substiute Parts

521755-4

TE Connectivity AMP ConnectorsIn Stock: 911521755-4 Datasheet

Current PartRFQ

521383-4

TE Connectivity AMP ConnectorsIn Stock: 885521383-4 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 521755-4 with the active equivalent 521383-4 is based on strict alignment of the following critical parameters:

Electrical Compatibility:

• Identical pitch spacing: 0.197" (5.00mm)
• Identical number of positions: 4
• Identical voltage rating: 250VAC
• Identical operating temperature range: -40°C ~ 120°C

Mechanical Compatibility:

• Identical connector type: Header
• Identical contact type: Tab
• Identical mounting type: Through Hole
• Identical shrouding configuration: Shrouded - 4 Wall
• Identical termination method: Solder
• Identical insulation material: Polyamide (PA66), Nylon 6/6
• Identical contact shape: Rectangular
• Identical insulation height: 0.504" (12.80mm)
• Identical contact length - post: 0.138" (3.50mm)

Regulatory Compliance:

• Both parts maintain UL94 V-0 material flammability rating
• Both parts are RoHS compliant
• Both parts have MSL rating of 1 (Unlimited)

The primary differences between these parts are contact finish specifications and product status, which do not affect functional interchangeability in standard applications.

Parameter Comparison

Engineering Selection Recommendations

The 521383-4 serves as the direct active equivalent for the obsolete 521755-4. Selection of the 521383-4 is supported by the following engineering factors:

Product Status Consideration: The 521383-4 maintains active product status with current manufacturing support, ensuring long-term availability and supply chain continuity compared to the obsolete 521755-4.

Regulatory Compliance: Both parts maintain identical UL94 V-0 material flammability ratings and MSL classifications. The 521383-4 carries RoHS compliance certification, meeting current regulatory requirements for electronic component procurement.

Electrical and Mechanical Equivalence: The 521383-4 maintains complete electrical and mechanical compatibility with the 521755-4 across all critical parameters including pitch spacing, number of positions, voltage rating, operating temperature range, mounting configuration, and contact geometry.

Contact Finish Specification: The primary technical difference is the contact finish specification. The 521383-4 utilizes tin plating (150.0µin / 3.81µm) compared to the silver plating (78.7µin / 2.00µm) of the 521755-4. Both finishes are suitable for general-purpose applications and solder termination processes.

Packaging Availability: The 521383-4 is supplied in tray packaging, which is standard for production environments and supports automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Are the 521755-4 and 521383-4 electrically interchangeable?

A: Yes. Both connectors maintain identical electrical specifications including 250VAC voltage rating, -40°C to 120°C operating temperature range, and 0.197" (5.00mm) pitch spacing for 4-position configurations.

Q: What is the difference between the silver and tin contact finishes?

A: The 521755-4 features silver plating at 78.7µin (2.00µm) thickness, while the 521383-4 features tin plating at 150.0µin (3.81µm) thickness. Both finishes are compatible with solder termination and general-purpose applications. Tin plating provides enhanced corrosion resistance in certain environmental conditions.

Q: Can the 521383-4 be used as a direct replacement in existing designs?

A: Yes. The 521383-4 maintains identical mechanical dimensions, mounting configuration, and contact geometry as the 521755-4, enabling direct substitution in through-hole PCB applications without design modification.

Q: Why is the 521755-4 listed as obsolete?

A: The 521755-4 has been discontinued by TE Connectivity AMP Connectors. The 521383-4 represents the active equivalent product for ongoing production and procurement requirements.

Q: Are there any compliance differences between these parts?

A: Both parts maintain UL94 V-0 material flammability ratings and MSL 1 (Unlimited) classifications. The 521383-4 carries current RoHS compliance certification, meeting modern regulatory standards for electronic component procurement.

Q: What is the packaging difference between these parts?

A: The 521755-4 packaging specification is not detailed in available documentation. The 521383-4 is supplied in tray packaging, which is standard for production environments and supports automated assembly processes.

Q: Are both parts suitable for the same temperature range applications?

A: Yes. Both the 521755-4 and 521383-4 maintain identical operating temperature specifications of -40°C to 120°C, making them suitable for equivalent thermal environment applications.