Interdigitated Electrodes: Electrode Width 1-10 μm

Component Specifications

Definition

Interdigitated electrodes (IDEs) are a type of electrode configuration consisting of two comb-shaped conductive arrays that interlock without touching, typically fabricated on piezoelectric substrates. They are fundamental components in interdigital transducers (IDTs) used to generate and detect surface acoustic waves (SAWs) through the piezoelectric effect. These electrodes convert electrical signals into mechanical waves and vice versa, enabling precise sensing, filtering, and signal processing applications in various industrial systems.

Working Principle

Interdigitated electrodes operate based on the piezoelectric effect. When an alternating voltage is applied across the electrodes, it induces periodic mechanical deformations in the piezoelectric substrate, generating surface acoustic waves (SAWs). Conversely, incoming SAWs create electrical signals across the electrodes. The electrode spacing (pitch) determines the resonant frequency, allowing for frequency-specific operation in devices like sensors and filters.

Materials

Electrodes: Typically made of aluminum (Al), gold (Au), or chromium/gold (Cr/Au) for conductivity and adhesion. Substrate: Piezoelectric materials such as lithium niobate (LiNbO3), quartz, or lead zirconate titanate (PZT).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Impedance	50 Ω typical
Electrode Width	1-10 μm
Resonant Frequency	10 MHz - 2 GHz
Operating Temperature	-40°C to 85°C
Number Of Finger Pairs	10-200
Electrode Spacing (Pitch)	2-20 μm

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

Standards

ISO 18563-1, DIN EN 1330-9

Parent Products

This component is used in the following industrial products

Interdigital Transducer (IDT)

A transducer that converts electrical signals to surface acoustic waves (SAWs) and vice versa through interleaved metal electrodes.

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Engineering Analysis

Risks & Mitigation

Electrode corrosion in harsh environments
Delamination from substrate under thermal stress
Frequency drift due to material aging

FMEA Triads

Trigger: Exposure to corrosive chemicals
Failure: Reduced conductivity and signal loss
Mitigation: Use protective coatings (e.g., silicon nitride) and select corrosion-resistant materials like gold.

Trigger: Thermal cycling
Failure: Cracking or delamination of electrodes
Mitigation: Implement thermal management designs and use substrates with matched thermal expansion coefficients.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1 μm for critical dimensions

Test Method

Electrical impedance analysis, optical microscopy for inspection, and frequency response testing per industry standards.

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

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Manufacturers of Interdigitated Electrodes

Manufacturer profiles associated with Interdigitated Electrodes.

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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 are the main applications of interdigitated electrodes?

Interdigitated electrodes are primarily used in surface acoustic wave (SAW) devices, including sensors for temperature, pressure, and chemical detection, as well as filters, delay lines, and resonators in telecommunications and industrial electronics.

How does electrode spacing affect performance?

Electrode spacing (pitch) directly determines the resonant frequency of the device; smaller spacing yields higher frequencies, enabling precise control for specific sensing or filtering applications.

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.

Interdigitated Electrodes