Leadframe / Substrate: Thickness 0.1mm to 0.25mm

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

Parameter	Typical range	Notes & selection driver
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

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

JEDEC JESD22, IPC-6012, MIL-PRF-38535

Parent Products

This component is used in the following industrial products

Package

In a 3-axis gyroscope, the package is the physical enclosure that protects the delicate MEMS (Micro-Electro-Mechanical Systems) sensor die from environmental factors such as moisture, dust, and mechanical stress.

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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

Typical Suppliers & Equivalents

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

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Leadframe / Substrate

Manufacturer profiles associated with Leadframe / Substrate.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Leadframe / Substrate