3M 81100-550303 Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The 3M 81100-550303 is a through-hole, right-angle rectangular connector header with 100 positions at 0.050" (1.27mm) pitch. This component is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and procurement planning. The connector features shrouded 4-wall construction with male pins, solder termination, and board lock fastening, designed for board-to-cable/wire applications in industrial and commercial electronics.

Substiute Parts

81100-550303

3MIn Stock: 99281100-550303 Datasheet

Current PartRFQ

81100-550303-RB

3MIn Stock: 122281100-550303-RB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3M 81100-550303 is determined by strict equivalence across the following critical parameters:

• Connector Type & Contact Configuration: Header with male pins
• Position Count & Pitch: 100 positions at 0.050" (1.27mm) mating pitch
• Row Configuration: 2 rows with 0.100" (2.54mm) row spacing
• Mounting & Orientation: Through-hole, right-angle mounting
• Shrouding & Fastening: Shrouded 4-wall construction with latch lock/eject hooks
• Termination Method: Solder termination
• Insulation Material & Dimensions: Liquid Crystal Polymer (LCP) with 0.310" insulation height
• Contact Geometry: Square contact shape with specified mating and post lengths
• Electrical Performance: 0.75A current rating and -55°C ~ 105°C operating temperature range
• Material Compliance: UL94 V-0 flammability rating

The substitute part 81100-550303-RB maintains all critical mechanical and electrical parameters while introducing variations in post-side contact finish composition and RoHS compliance status.

Parameter Comparison

Engineering Selection Recommendations

The 3M 81100-550303-RB serves as a direct functional substitute for the 81100-550303. Both parts are classified as obsolete within the 3M 810 series and share identical mechanical and electrical specifications across all critical mating and mounting parameters.

The primary distinction between these parts is the post-side contact finish composition and thickness. The main part (81100-550303) uses tin-lead plating at 125.0µin thickness, while the substitute (81100-550303-RB) employs pure tin plating at 250.0µin thickness. This difference reflects manufacturing evolution and environmental compliance trends.

The substitute part achieves RoHS compliance, whereas the main part does not. For applications subject to RoHS regulatory requirements, the 81100-550303-RB is the appropriate selection. For legacy systems or applications without RoHS mandates, either part maintains functional equivalence.

Both parts carry UL94 V-0 flammability certification and operate across the identical temperature range of -55°C to 105°C, supporting equivalent thermal performance in industrial and commercial environments.

Frequently Asked Questions (FAQ)

Q: Are the 81100-550303 and 81100-550303-RB mechanically interchangeable?

A: Yes. Both parts maintain identical connector geometry, position count, pitch spacing, mounting orientation, and shrouding configuration. They are mechanically interchangeable in board-level applications.

Q: What is the significance of the different post-side contact finishes?

A: The main part uses tin-lead plating (125.0µin), a traditional finish. The substitute uses pure tin plating (250.0µin), which reflects modern manufacturing standards and supports RoHS compliance. Both finishes provide equivalent solder joint reliability when properly processed.

Q: Does the RoHS compliance difference affect electrical performance?

A: No. RoHS compliance status reflects material composition and environmental standards, not electrical characteristics. Both parts deliver identical current rating (0.75A) and operating temperature range (-55°C ~ 105°C).

Q: Can I use the 81100-550303-RB in a design originally specified for the 81100-550303?

A: Yes, provided your application does not explicitly prohibit RoHS-compliant components or require tin-lead contact finishes for legacy compatibility. The substitute maintains all functional and mechanical equivalence.

Q: What is the Moisture Sensitivity Level (MSL) difference between these parts?

A: The main part carries MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. The substitute lists MSL as Not Applicable, reflecting its RoHS-compliant manufacturing process. This does not affect field handling or storage requirements for either part.

Q: Are both parts still available for procurement?

A: Both parts are classified as obsolete. Availability depends on distributor inventory. The substitute (81100-550303-RB) shows higher current stock levels (1114 pcs vs. 932 pcs), which may influence procurement decisions for legacy system support.