INDUSTRY COMPONENT

Leadframe / Substrate

Leadframe/Substrate: A critical component in semiconductor packaging that provides electrical connections and mechanical support for integrated circuits.

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Component Specifications

Definition
A leadframe or substrate is a structural component in semiconductor packaging that serves as the interface between the integrated circuit die and the external circuit board. It provides electrical pathways through conductive traces, mechanical support for the die, and thermal dissipation capabilities. Leadframes are typically made of metal alloys and used in traditional packages, while substrates are often multilayer organic or ceramic structures used in advanced packaging technologies like BGA and flip-chip.
Working Principle
The leadframe/substrate functions by providing a patterned conductive framework that connects the bond pads of the semiconductor die to external pins or balls. Electrical signals travel from the die through wire bonds or solder bumps to the leadframe/substrate traces, which then route them to external connections. It also serves as a mechanical platform for die attachment and encapsulation, and as a thermal path for heat dissipation from the active device.
Materials
Copper alloys (C194, C7025), Alloy 42 (Fe-42Ni), Kovar (Fe-Ni-Co), Aluminum, Ceramic (Al2O3, AlN), Organic substrates (FR-4, BT resin, polyimide), with plating options including silver, gold, nickel-palladium-gold, and tin.
Technical Parameters
  • CTE 4-18 ppm/°C
  • Pitch 0.3mm to 1.27mm
  • Thickness 0.1mm to 0.25mm
  • Lead Count 8 to 1000+
  • Die Pad Size Custom to die dimensions
  • Package Size 2mm x 2mm to 50mm x 50mm
  • Thermal Conductivity 200-400 W/mK for metal, 20-200 W/mK for ceramic
Standards
ISO 9001, JEDEC JESD22, IPC-6012, MIL-PRF-38535

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Leadframe / Substrate.

semiconductor leadframe IC substrate packaging component die attach wire bonding BGA substrate flip-chip packaging thermal management Leadframe / Substrate Leadframe / Substrate 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
  • CTE mismatch causing thermal stress
  • delamination during reflow
  • corrosion in humid environments
  • wire bond lift-off
  • solder joint fatigue
FMEA Triads
Trigger: CTE mismatch between materials
Failure: Cracking or delamination during thermal cycling
Mitigation: Material selection with matched CTE, stress-relief designs, underfill application
Trigger: Contamination on bonding surfaces
Failure: Poor wire bond or solder joint integrity
Mitigation: Cleanroom handling, surface plating, pre-bond cleaning processes
Trigger: Insufficient thermal dissipation
Failure: Device overheating and premature failure
Mitigation: Thermal vias, heat spreaders, material selection with high thermal conductivity

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.02mm for critical dimensions, ±0.05mm for general features
Test Method
X-ray inspection for internal defects, cross-section analysis, thermal cycling (-55°C to 150°C), humidity testing (85°C/85% RH), shear and pull tests for bond integrity

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between leadframe and substrate?

Leadframes are single-layer metal frames used in traditional packages like QFP and SOIC, while substrates are multilayer structures (organic or ceramic) used in advanced packages like BGA and CSP that require higher density interconnections.

What materials are commonly used for leadframes?

Copper alloys (C194, C7025) are most common for their conductivity and cost, while Alloy 42 and Kovar are used when CTE matching to silicon is critical. Plating with silver, gold, or NiPdAu provides bondable surfaces.

How does substrate design affect package performance?

Substrate design impacts electrical performance (impedance control, signal integrity), thermal management (heat spreading), mechanical reliability (warpage control), and miniaturization capabilities through multilayer routing.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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