INDUSTRY COMPONENT

Die Attach Pad

A die attach pad is a metalized area on a substrate or leadframe that provides mechanical support, electrical connection, and thermal dissipation for semiconductor die attachment in electronic packaging.

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Component Specifications

Definition
A die attach pad (DAP) is a critical component in semiconductor packaging that serves as the mounting surface for the semiconductor die. It is typically a metalized region on a substrate (like a PCB or ceramic) or part of a leadframe, designed to securely bond the die using adhesives, solders, or eutectic materials. The DAP ensures mechanical stability, electrical grounding or connection, and efficient heat transfer away from the die, which is essential for device reliability and performance. It is engineered with precise dimensions and surface finishes to optimize adhesion and thermal conductivity.
Working Principle
The die attach pad operates by providing a stable, conductive platform for attaching the semiconductor die. During assembly, an adhesive or solder material is applied to the pad, and the die is placed on it. The assembly is then cured or reflowed to form a strong bond. The pad's material and design facilitate electrical connectivity (often to ground) and thermal management by conducting heat from the die to the package or heat sink, thereby preventing overheating and ensuring operational integrity.
Materials
Common materials include copper alloys (e.g., C194, C151), aluminum, or nickel-plated surfaces for leadframes; and copper, silver, or gold metallization on ceramic or organic substrates. Adhesives used include epoxy-based materials, silver-filled epoxies, solder alloys (e.g., Pb-Sn, Sn-Ag-Cu), or eutectic materials like gold-silicon.
Technical Parameters
  • Size Varies by die dimensions (e.g., 2mm x 2mm to 10mm x 10mm)
  • Flatness < 0.05mm tolerance
  • Thickness Typically 0.1mm to 0.5mm
  • Surface Finish Electroplated nickel/gold, OSP, or bare copper
  • Thermal Conductivity 200-400 W/mK for copper-based pads
  • Electrical Resistivity < 0.1 ohm for conductive pads
Standards
ISO 14644, JEDEC JESD22, IPC-7093

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Die Attach Pad.

die attach pad semiconductor packaging chip bonding thermal management leadframe substrate electronic components Die Attach Pad 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
  • Poor adhesion leading to die detachment
  • Thermal mismatch causing stress cracks
  • Electrical shorts from contamination
  • Insufficient heat dissipation causing device failure
FMEA Triads
Trigger: Inadequate adhesive curing or contamination
Failure: Die detachment or weak bond
Mitigation: Implement strict process controls, use high-purity materials, and perform regular inspections and adhesion tests.
Trigger: Thermal expansion mismatch between materials
Failure: Cracking or delamination
Mitigation: Select materials with compatible CTE, design with stress-relief features, and use underfill materials if needed.
Trigger: Poor surface finish or oxidation
Failure: Reduced electrical or thermal conductivity
Mitigation: Apply protective coatings like nickel/gold plating, maintain cleanroom environments, and use inert atmospheres during processing.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Dimensional tolerance typically ±0.05mm, flatness < 0.1mm per industry standards
Test Method
Testing includes shear strength tests (per JEDEC JESD22-B117), thermal cycling (per JESD22-A104), and visual inspection for defects.

Buyer Feedback

★★★★☆ 4.6 / 5.0 (23 reviews)

"Reliable performance in harsh Computer, Electronic and Optical Product Manufacturing environments. No issues with the Die Attach Pad so far."

"Testing the Die Attach Pad 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."

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Frequently Asked Questions

What is the primary function of a die attach pad?

The primary function is to provide mechanical support, electrical connectivity (often grounding), and thermal dissipation for the semiconductor die, ensuring device reliability and performance.

What materials are commonly used for die attach pads?

Common materials include copper alloys for leadframes, and metallized surfaces like copper or silver on substrates, often paired with adhesives such as epoxy or solder for bonding.

How does a die attach pad impact thermal management?

It conducts heat away from the die to the package or heat sink, preventing overheating and maintaining optimal operating temperatures, which is critical for high-power devices.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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