RF EMI Absorbing Sheet 4504 - Equivalent & Substitute Parts

Part Overview

The Laird Technologies EMI model 4504 is an RF EMI absorbing sheet constructed from polyurethane foam with dimensions of 24.000" (609.60mm) × 24.000" (609.60mm) × 3.000" (76.20mm). This component is classified as an absorbing sheet designed for electromagnetic interference mitigation in RF applications. The product is currently listed as obsolete, making identification of suitable substitute components necessary for ongoing procurement and system maintenance.

Substiute Parts

4504

Laird Technologies EMIIn Stock: 10814504 Datasheet

Current PartRFQ

78087099

Laird Technologies EMIIn Stock: 112578087099 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for RF EMI absorbing sheets is determined by the following parameters:

Primary Substitution Criteria:

• Material composition (polyurethane foam)
• Planar dimensions (length and width: 24.000" × 24.000")
• Product type classification (absorbing sheet)
• ECCN export classification (EAR99)

Secondary Considerations:

• Thickness variation tolerance
• Adhesive properties (if applicable to application)
• Operating temperature range
• Product status and availability

The substitute part 78087099 maintains identical planar dimensions and material composition while introducing a pressure-sensitive adhesive (PSA) backing and reduced thickness specification. Both components are classified under EAR99 and are manufactured by Laird Technologies EMI.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

Part 78087099 qualifies as a direct substitute for 4504 based on matching material composition, identical planar dimensions, and equivalent ECCN classification. The substitute maintains active product status, ensuring continued availability and supply chain reliability.

Key Differences Requiring Evaluation:

1. Thickness Reduction: The substitute part measures 2.240" (57.00mm) compared to the original 3.000" (76.20mm). This 0.760" (19.20mm) reduction in thickness may affect electromagnetic absorption characteristics and mechanical fit within existing enclosures or mounting structures.

2. Adhesive Addition: Part 78087099 incorporates pressure-sensitive adhesive backing, whereas the original part specification does not indicate adhesive properties. This addition facilitates installation but may introduce constraints regarding repositioning or removal.

3. Compliance Enhancement: The substitute part carries ROHS3 compliance and REACH unaffected status, providing regulatory advantages for applications subject to these standards.

4. Operating Temperature: The substitute specifies 90°C maximum operating temperature, establishing a defined thermal operating envelope absent from the original part specification.

Selection Basis:

Component selection should prioritize the active product status of 78087099 and its enhanced regulatory compliance profile. Thickness differential and adhesive properties must be evaluated against specific application requirements and mechanical constraints.

Frequently Asked Questions (FAQ)

Q: Can part 78087099 directly replace 4504 in all applications?

A: Both parts share identical planar dimensions (24.000" × 24.000"), material composition (polyurethane foam), and ECCN classification (EAR99). However, the 0.760" thickness reduction and addition of pressure-sensitive adhesive require verification against specific application mechanical and installation requirements.

Q: What is the significance of the thickness difference between these parts?

A: The original 4504 measures 3.000" (76.20mm) thick, while substitute 78087099 measures 2.240" (57.00mm) thick. This difference may impact electromagnetic absorption performance and physical fit within enclosures. Application-specific testing may be necessary to confirm performance equivalence.

Q: Does the pressure-sensitive adhesive on part 78087099 affect compatibility?

A: The PSA backing on 78087099 provides adhesive mounting capability not present in the original 4504 specification. This feature simplifies installation but may restrict repositioning. Applications requiring non-adhesive mounting should confirm compatibility with existing mechanical fastening methods.

Q: Why is 4504 listed as obsolete?

A: Product 4504 is classified as obsolete, indicating discontinued manufacturing and limited availability. Part 78087099 maintains active status, ensuring reliable procurement and supply continuity.

Q: Are there regulatory compliance differences between these parts?

A: Part 78087099 carries ROHS3 compliance and REACH unaffected status. The original 4504 specification does not document these certifications. Applications subject to ROHS3 or REACH requirements should prioritize the substitute part.

Q: What operating temperature range applies to these absorbing sheets?

A: Part 78087099 specifies a maximum operating temperature of 90°C. The original 4504 does not provide operating temperature specification. Applications operating above 90°C require confirmation of thermal compatibility.

Q: How do the packaging specifications differ?

A: Part 4504 packaging is listed as unspecified. Part 78087099 is supplied in bulk packaging. Procurement requirements should account for bulk packaging format when ordering the substitute component.