External Electrode/Termination: Thickness 10-50 micrometers

Component Specifications

Definition

An external electrode or termination is a critical component in piezoelectric stacks that serves as the electrical interface between the piezoelectric ceramic layers and external circuitry. It facilitates the application of voltage to induce mechanical displacement (actuation) or the collection of electrical charge from mechanical stress (sensing). These terminations are designed to ensure reliable electrical contact, minimize signal loss, and withstand mechanical and thermal stresses during operation. They are typically applied to the outer surfaces of the stack and may include features for soldering, wire bonding, or connector attachment.

Working Principle

The external electrode/termination works by providing a conductive path for electrical signals to and from the piezoelectric ceramic layers. When voltage is applied through the termination, it creates an electric field across the piezoelectric material, causing deformation (inverse piezoelectric effect). Conversely, mechanical stress on the stack generates an electrical charge collected via the termination (direct piezoelectric effect). The termination must maintain low electrical resistance and good adhesion to prevent arcing, delamination, or signal degradation.

Materials

Common materials include silver-palladium (Ag-Pd) alloys, nickel (Ni), copper (Cu), or gold (Au) for conductivity, often applied as thick-film pastes or thin-film coatings. Substrates or backing may use ceramics (e.g., alumina) or polymers for insulation. Adhesive layers might include glass frits or epoxy resins. Material selection depends on factors like operating temperature (e.g., up to 150°C for standard stacks), compatibility with soldering processes, and corrosion resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thickness	10-50 micrometers
Resistance	< 1 ohm
Adhesion Strength	> 10 MPa
Insulation Resistance	> 100 MΩ
Operating Temperature	-40°C to 150°C

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 17561, DIN EN 50324

Parent Products

This component is used in the following industrial products

Piezoelectric Stack

A multi-layer assembly of piezoelectric ceramic elements that generates precise linear displacement when voltage is applied.

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Engineering Analysis

Risks & Mitigation

Delamination due to thermal cycling
Electrical arcing at high voltages
Corrosion in humid environments
Poor adhesion leading to contact failure

FMEA Triads

Trigger: Thermal expansion mismatch between electrode and ceramic
Failure: Cracking or delamination of the electrode layer
Mitigation: Use compatible materials with similar coefficients of thermal expansion; apply stress-relief designs

Trigger: Insufficient insulation or contamination
Failure: Electrical short circuits or leakage
Mitigation: Implement cleanroom processes; apply protective coatings; adhere to dielectric strength standards

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±5% for electrical resistance; ±10 micrometers for thickness

Test Method

Electrical testing (resistance, insulation), adhesion peel tests, thermal cycling per IEC 60068-2-14

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

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Inspection readiness

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Manufacturers of External Electrode/Termination

Manufacturer profiles associated with External Electrode/Termination.

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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 purpose of an external electrode in a piezoelectric stack?

It provides electrical connectivity to apply voltage for actuation or collect charge from sensing, ensuring efficient energy transfer between the piezoelectric material and external systems.

How are external electrodes typically attached to piezoelectric stacks?

They are applied via screen printing, sputtering, or plating methods, followed by firing or curing to bond with the ceramic layers, and may include soldering or wire bonding for external connections.

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.

External Electrode/Termination