INDUSTRY COMPONENT

Molding Compound / Lid

Molding compound or lid used for encapsulating and protecting semiconductor packages in electronics manufacturing.

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Component Specifications

Definition
A thermosetting epoxy resin compound or protective lid applied to semiconductor packages to provide mechanical protection, environmental sealing, electrical insulation, and thermal management. It forms a hermetic or non-hermetic seal over integrated circuits during transfer molding or encapsulation processes.
Working Principle
The molding compound is heated to become fluid, then injected under pressure into molds containing semiconductor dies. It cures through cross-linking polymerization to form a rigid protective enclosure. Lids are typically attached using adhesives or solder to create sealed cavities for sensitive components.
Materials
Epoxy molding compounds (EMC) with silica fillers, flame retardants, and coupling agents; ceramic lids (alumina, aluminum nitride); metal lids (Kovar, Alloy 42); thermoplastic compounds for specific applications.
Technical Parameters
  • Flame Retardancy UL94 V-0
  • Flexural Strength 120-180 MPa
  • Moisture Absorption <0.1-0.3%
  • Thermal Conductivity 0.6-2.5 W/m·K
  • Ionic Impurity Levels <20 ppm
  • Glass Transition Temperature (Tg) 125-200°C
  • Coefficient of Thermal Expansion (CTE) 8-20 ppm/°C
Standards
ISO 9001, JEDEC JESD22, IPC-7093, MIL-STD-883

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Molding Compound / Lid.

epoxy molding compound semiconductor encapsulation package lid IC packaging materials transfer molding hermetic sealing thermal management electronics Molding Compound / Lid Molding Compound / Lid in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Package

The protective housing and electrical interface for a 3-axis gyroscope chip.

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Engineering Analysis

Risks & Mitigation
  • Delamination from die/leadframe
  • Cracking during thermal cycling
  • Moisture-induced failures
  • Warpage affecting coplanarity
  • Alpha particle emission causing soft errors
FMEA Triads
Trigger: Inadequate adhesion between compound and substrate
Failure: Interface delamination leading to moisture ingress and corrosion
Mitigation: Optimize mold chase design, improve surface treatments, use adhesion promoters, control molding parameters
Trigger: CTE mismatch between materials
Failure: Thermal stress cracking during temperature cycling
Mitigation: Select compounds with matched CTE, incorporate stress-relief features, use underfill materials for critical applications

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.05mm for critical dimensions, ±2% for material properties
Test Method
JEDEC moisture sensitivity testing, thermal cycling (-65°C to 150°C), pressure cooker test (121°C/100%RH), scanning acoustic microscopy for delamination detection

Buyer Feedback

★★★★☆ 4.5 / 5.0 (17 reviews)

"Testing the Molding Compound / Lid now; the technical reliability results are within 1% of the laboratory datasheet."

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Computer, Electronic and Optical Product Manufacturing sector, I confirm this Molding Compound / Lid meets all ISO standards."

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Frequently Asked Questions

What is the difference between molding compound and lid in semiconductor packaging?

Molding compound is a resin that fully encapsulates components through molding processes, while lids are pre-formed covers attached to create sealed cavities, typically used for MEMS, sensors, or RF devices requiring controlled atmospheres.

How does moisture affect molding compound performance?

Moisture absorption can cause popcorning (package cracking) during reflow, reduce adhesion, increase ionic contamination, and accelerate corrosion of metal interconnects, requiring careful material selection and storage conditions.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Module Housing Molybdenum Core/Base