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Metallization / Bonding Pads Component – Computer, Electronic and Optical Product Manufacturing

Component Specifications

Definition

Metallization refers to the deposition of thin metal layers (typically aluminum, gold, or copper) on semiconductor surfaces to create conductive pathways. Bonding pads are specific metallized areas designed for wire bonding or flip-chip connections, enabling electrical interfacing between the photodiode array and external circuitry. These components ensure reliable signal extraction, power distribution, and mechanical stability in optoelectronic devices.

Working Principle

Metallization forms conductive traces through physical vapor deposition (PVD) or chemical vapor deposition (CVD), while bonding pads serve as contact points for wire bonding (using thermosonic, ultrasonic, or thermocompression techniques) or solder bumps. They facilitate electron flow from the photodiode's active region to external leads, maintaining low resistance and minimal signal loss.

Materials

Aluminum (Al), Gold (Au), Copper (Cu), or alloys; often with adhesion layers (e.g., titanium, chromium) and barrier layers (e.g., nickel, palladium) to prevent diffusion and oxidation. Dielectric underlayers like silicon dioxide (SiO2) or silicon nitride (Si3N4) provide insulation.

Technical Parameters

Pad Size 50-150 μm diameter
Metal Thickness 0.5-2 μm
Sheet Resistance <0.1 Ω/sq
Adhesion Strength >50 MPa
Wire Bond Pull Strength >5 gf

Standards

ISO 14644-1, DIN EN 60749-25, JEDEC JESD22-B116

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Metallization / Bonding Pads.

Parent Products

This component is used in the following industrial products

Photodiode Array

A linear or two-dimensional arrangement of multiple photodiodes integrated on a single semiconductor substrate for simultaneous detection of light intensity across multiple points.

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Engineering Analysis

Risks & Mitigation

Delamination due to poor adhesion
Corrosion from environmental exposure
Electromigration causing open circuits
Wire bond fatigue failure

FMEA Triads

Trigger: Inadequate adhesion layer deposition
Failure: Metal layer delamination
Mitigation: Implement strict process controls for PVD/CVD, use adhesion promoters, and perform regular peel tests per DIN EN 60749-25.

Trigger: Contamination during bonding
Failure: High contact resistance or open circuit
Mitigation: Enforce cleanroom protocols (ISO 14644-1), use automated bonding equipment with real-time monitoring, and apply plasma cleaning pre-treatment.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

±5% on pad dimensions, ±10% on metal thickness

Test Method

Electrical testing (four-point probe for resistivity), shear/pull tests for bond strength, SEM/EDS for material analysis

Buyer Feedback

★★★★☆ 4.5 / 5.0 (36 reviews)

"Found 40+ suppliers for Metallization / Bonding Pads on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Metallization / Bonding Pads is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Computer, Electronic and Optical Product Manufacturing environments. No issues with the Metallization / Bonding Pads so far."

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Frequently Asked Questions

What is the primary function of bonding pads in a photodiode array?

Bonding pads provide reliable electrical connection points for wire bonding or flip-chip attachments, enabling signal transmission from the photodiode to external circuits with minimal resistance and signal degradation.

Why is gold commonly used for bonding pads?

Gold offers excellent conductivity, corrosion resistance, and ductility, making it ideal for wire bonding processes. It also forms reliable intermetallic bonds with aluminum wires, ensuring long-term stability in harsh environments.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Metallization / Bonding Pads