Copper Conductors: Temperature Range -65°C to +150°C

Component Specifications

Definition

Copper conductors in flexible PCBs are thin, patterned layers of copper foil laminated onto flexible dielectric substrates (typically polyimide). These conductors form the electrical pathways that carry signals and power between electronic components. They are manufactured through processes like etching or additive deposition, with thicknesses ranging from 9μm to 70μm (0.25oz to 2oz). The conductors must maintain electrical continuity while withstanding repeated flexing, thermal cycling, and environmental stresses inherent in flexible circuit applications.

Working Principle

Copper conductors operate on the principle of electrical conductivity, where free electrons in the copper lattice facilitate the flow of electric current. In flexible PCBs, these conductors are patterned to create specific circuit paths that connect electronic components. The high conductivity of copper (approximately 5.96×10⁷ S/m at 20°C) minimizes resistive losses, while the ductility of copper allows the conductors to withstand mechanical flexing without fracture. The conductors work in conjunction with insulating layers to prevent short circuits while maintaining signal integrity through controlled impedance design.

Materials

Electrodeposited (ED) or rolled annealed (RA) copper foil with purity ≥99.9%, typically with surface treatments (such as oxide treatment or nickel/gold plating) for improved adhesion and solderability. Common thicknesses: 9μm (1/4 oz), 18μm (1/2 oz), 35μm (1 oz), 70μm (2 oz). Dielectric substrates: Polyimide (Kapton), polyester (PET), or liquid crystal polymer (LCP).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Elongation	10-25%
Conductivity	≥58 MS/m (100% IACS)
Peel Strength	≥0.8 N/mm
Tensile Strength	200-350 MPa
Surface Roughness	0.3-3.0 μm
Temperature Range	-65°C to +150°C
Maximum Current Density	30-50 A/mm²

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 6722, IPC-6013, IPC-2223, IEC 61249-2-6, ASTM B152

Parent Products

This component is used in the following industrial products

Flexible PCB

A flexible printed circuit board that can bend and conform to various shapes while maintaining electrical connectivity.

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Engineering Analysis

Risks & Mitigation

Electromigration under high current density
Fatigue cracking from cyclic flexing
Corrosion in humid environments
Delamination from dielectric substrate
Signal integrity issues at high frequencies

FMEA Triads

Trigger: Insufficient bend radius during installation
Failure: Fatigue cracking of copper traces
Mitigation: Design with minimum bend radius ≥10× conductor thickness; use strain relief features

Trigger: Thermal expansion mismatch between copper and substrate
Failure: Delamination and open circuits
Mitigation: Use adhesives with matched CTE; implement thermal stress relief designs

Trigger: Exposure to corrosive environments
Failure: Copper oxidation and increased resistance
Mitigation: Apply protective conformal coatings; use corrosion-resistant surface finishes

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Conductor width tolerance: ±0.05mm for features >0.2mm; Positional tolerance: ±0.1mm relative to datum features

Test Method

Electrical continuity testing (4-wire Kelvin method), cross-section microscopy for thickness verification, peel strength testing per IPC-TM-650, thermal cycling (-40°C to +125°C, 1000 cycles), flex endurance testing (dynamic bending test)

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 Copper Conductors

Manufacturer profiles associated with Copper Conductors.

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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 advantages of copper conductors in flexible PCBs?

Copper offers excellent electrical conductivity (second only to silver among common metals), good thermal conductivity, ductility for flex endurance, solderability, and cost-effectiveness compared to precious metals.

How do copper conductors withstand repeated flexing in flexible circuits?

Rolled annealed copper foil provides better flex endurance than electrodeposited copper due to its grain structure. Proper design with appropriate bend radii, conductor thickness, and strain relief features prevents fatigue failure.

What surface treatments are applied to copper conductors in flexible PCBs?

Common treatments include oxide treatments for adhesion, nickel/gold plating for wire bonding and corrosion resistance, tin plating for solderability, and organic solderability preservatives (OSP) for surface protection.

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.

Copper Conductors