INDUSTRY COMPONENT

Termination

Surface mount capacitor termination is the conductive end connection that provides electrical contact and mechanical attachment to printed circuit boards.

Component Specifications

Definition
A termination in surface mount capacitors refers to the metallized electrode structure at each end of the capacitor body that enables electrical connection to circuit board pads through soldering. These terminations typically consist of multiple layers including inner electrode connection, barrier layer, and outer solderable finish, designed to ensure reliable electrical performance, thermal stability during reflow soldering, and mechanical integrity under thermal cycling and vibration conditions.
Working Principle
Terminations function by providing a low-resistance electrical path from the capacitor's internal electrodes to external circuit connections. The layered construction prevents diffusion between materials, maintains solder joint reliability through thermal expansion matching, and ensures consistent electrical characteristics across operating conditions.
Materials
Multi-layer structure: Nickel barrier layer (2-5μm), Tin-Lead or Lead-Free solder coating (SnAgCu, SnCu, or pure Tin, 3-8μm), Silver or Copper inner electrode connection. Base materials vary by capacitor type: Ceramic capacitors use silver-palladium or copper terminations, tantalum capacitors use manganese dioxide or conductive polymer with silver epoxy, aluminum electrolytic capacitors use aluminum foil with conductive adhesive.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Peel Strength≥1.5N/mm
Solderability≥95% coverage per IPC-J-STD-002
Termination Width0.5mm to 3.2mm
Contact Resistance<10mΩ
Termination Length0.8mm to 2.5mm
Thermal Shock Resistance-55°C to +125°C, 1000 cycles

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

Standards
IEC 60384, EIA-198, JIS C 5102, IPC-7351

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Solder joint cracking due to thermal expansion mismatch
  • Tin whisker growth in pure tin coatings
  • Delamination during reflow soldering
  • Corrosion in humid environments
  • Poor solderability from oxidation
FMEA Triads
Trigger: Insufficient barrier layer thickness
Failure: Diffusion between electrode and solder causing increased ESR
Mitigation: Maintain minimum 2μm nickel barrier layer with quality control verification
Trigger: Thermal expansion coefficient mismatch
Failure: Solder joint cracking during thermal cycling
Mitigation: Use termination materials with CTE matching to PCB substrate (13-18 ppm/°C)
Trigger: Poor solderability due to oxidation
Failure: Incomplete solder wetting leading to open circuits
Mitigation: Implement nitrogen atmosphere storage and use within 12 months of manufacturing

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Termination position tolerance: ±0.1mm, Coplanarity: ≤0.1mm, Solder fillet height: 25-75% of termination thickness
Test Method
Visual inspection per IPC-A-610, Solderability testing per J-STD-002, Cross-section analysis for layer integrity, Thermal shock testing per MIL-STD-202 Method 107

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 Termination

Manufacturer profiles associated with Termination.

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Related Components

Dielectric Layer
Insulating layer in surface mount capacitors that stores electrical energy through polarization.
Optical Window
Transparent optical component for light transmission in polycarbonate lens housings
PCB Substrate
PCB substrate is the foundational insulating layer that provides mechanical support and electrical connectivity for electronic components in high-speed memory modules.
Edge Connector
Edge connector is a printed circuit board (PCB) connector that mates with the edge of another PCB, commonly used in high-speed memory modules for reliable electrical connections.

Frequently Asked Questions

What is the difference between lead-free and tin-lead terminations?

Lead-free terminations (typically SnAgCu) have higher melting points (217-227°C vs 183°C for SnPb), requiring higher reflow temperatures but offering better environmental compliance. Tin-lead provides superior solder joint formation and thermal fatigue resistance but is restricted in many applications due to RoHS regulations.

How do termination materials affect capacitor performance?

Termination materials directly impact ESR (Equivalent Series Resistance), current carrying capacity, and thermal performance. Silver terminations offer lowest ESR but higher cost, while copper provides good conductivity with better cost-effectiveness. Barrier layers prevent diffusion that could degrade electrical properties over time.

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.

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