Electrical Contact Pads/Vias: Current Capacity 1-5A per via

Q: What is the difference between pads and vias?

Pads are surface features for component attachment, while vias are vertical interconnects between PCB layers. Pads provide external connection points; vias enable internal layer routing.

Q: How do you prevent via failure in high-temperature applications?

Use filled/tented vias, select materials with matched CTE, implement thermal relief patterns, and follow IPC standards for plating thickness and aspect ratio limits.

Q: What surface finish is best for contact pads?

ENIG provides excellent flatness and oxidation resistance for fine-pitch components, while HASL offers cost-effectiveness for general applications. Choice depends on component type, reliability requirements, and budget.

Component Specifications

Definition

Electrical contact pads are exposed conductive surfaces on PCB substrates designed for soldering or pressure-contact connections with components like ICs, connectors, or test probes. Vias are plated through-holes or blind/buried holes that provide vertical electrical connectivity between different PCB layers, facilitating multi-layer circuit routing and thermal management in high-density designs.

Working Principle

Contact pads function by providing a metallized surface for reliable electrical interface through soldered joints or spring-loaded contacts. Vias work by electroplating copper inside drilled holes to create conductive channels between layers, allowing signals and power to traverse the PCB stackup while maintaining electrical continuity and impedance control.

Materials

Copper (electrodeposited or rolled annealed) with surface finishes: ENIG (Electroless Nickel Immersion Gold), HASL (Hot Air Solder Leveling), Immersion Tin, OSP (Organic Solderability Preservative). Via plating: Copper with optional silver or gold flash. Dielectric: FR-4, polyimide, or high-frequency laminates.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Resistance	<50 mΩ per via
Aspect Ratio	Up to 10:1
Pad Diameter	0.2-2.0 mm
Via Diameter	0.1-0.5 mm
Copper Thickness	17-70 μm
Current Capacity	1-5A per via
Plating Thickness	20-25 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

IPC-6012, IPC-2221, ISO 9001, IEC 61188-5

Parent Products

This component is used in the following industrial products

Socket Adapter Plate/Interface Board

A mechanical and electrical interface component that adapts between a test socket and the test site platform.

View Product Details

Engineering Analysis

Risks & Mitigation

Thermal stress cracking
Plating voids
Solder joint failure
Signal integrity degradation
Corrosion in humid environments

FMEA Triads

Trigger: Insufficient plating thickness
Failure: Open circuit or high resistance in vias
Mitigation: Implement strict process controls, regular cross-section inspections, and use automated optical inspection (AOI)

Trigger: Thermal expansion mismatch
Failure: Pad lifting or via barrel cracking during thermal cycling
Mitigation: Select materials with compatible CTE, use thermal relief designs, and implement proper reflow profiles

Trigger: Contamination on contact surfaces
Failure: Intermittent connections or increased contact resistance
Mitigation: Implement cleanroom assembly, use protective coatings, and follow IPC cleaning standards

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05 mm for pad positioning, ±10% for plating thickness

Test Method

Continuity testing, cross-section microscopy, solderability testing per J-STD-002, thermal cycling per IPC-TM-650

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 Electrical Contact Pads/Vias

Manufacturer profiles associated with Electrical Contact Pads/Vias.

Sourcing Electrical Contact Pads/Vias from China?

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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 pads and vias?