Capacitors
Charge up your project! We stock a massive selection of capacitors from industry giants like Murata, Panasonic, and Kemet. Whether you need electrolytic, ceramic, or film capacitors, find the perfect fit for your power needs, all conveniently located in one place. Stop capacitor hopping and start building – everything’s here!
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Frequently Asked Questions About Capacitors
Our BOM includes capacitors without a dielectric type specified. How does ASC help us confirm we're sourcing the right type for each application?
Capacitor type selection has real engineering consequences that don't show up until a board is in circuit. An MLCC with a Y5V dielectric can lose a substantial portion of its rated capacitance under DC bias and temperature, while a C0G or X7R part holds its value far more consistently under the same conditions. Electrolytic and polymer capacitors are preferred where high capacitance in a compact footprint matters most, while film capacitors are often selected for their low ESR and stable self-resonance characteristics in power conversion and filtering applications. ASC stocks MLCCs, aluminum electrolytic, aluminum polymer, film, and tantalum capacitors from manufacturers including Murata, Panasonic, and KEMET. Submit your BOM with your RFQ, and the team can review dielectric type and voltage rating against your application requirements before you place an order.
Does ASC carry an authorized capacitor line for industrial and automotive power applications?
Yes. ASC is an authorized distributor of PSA Prosperity Dielectrics (PDC), which manufactures passive components and ceramic solutions for power, industrial, and automotive environments. Buying through an authorized channel means full traceability to the manufacturer, access to complete documentation, and components covered under the manufacturer's quality assurance rather than sourced from secondary markets. For capacitor requirements outside the PDC portfolio, ASC's global sourcing team can source from a broad range of capacitor manufacturers to match your specific value, package, and environmental rating.
Are counterfeit or misrepresented capacitors a real procurement risk, or is this mostly a concern for semiconductors?
Counterfeit and substandard capacitors are a genuine risk, though the failure modes differ from what you see with ICs. The most common problem is remarking, where a part is relabeled to show a higher capacitance value, a higher voltage rating, or a more stable dielectric class. A Y5V part relabeled as X7R passes a visual inspection but behaves incorrectly in circuit, with capacitance dropping under load and temperature. Electrical testing can verify capacitance and ESR, and XRF analysis can confirm terminal and dielectric material composition against manufacturer specifications. ASC's sourcing process for open-market capacitors runs under AS 6081:2012 certification, with incoming inspection and counterfeit avoidance testing applied before shipment.
A specific capacitor value or package in our design has been discontinued. What does ASC need to identify a replacement?
The most useful starting point is the original manufacturer part number, which lets ASC's team pull the full datasheet and identify every parameter that matters for a valid cross. Capacitance and voltage rating are obvious starting points, but temperature coefficient (C0G/NP0, X7R, X5R, Y5V), DC bias characteristics, ESR, and package dimensions all determine whether a substitute will perform equivalently in circuit. Crossing an MLCC looks straightforward until you check DC bias curves and discover that the replacement part can lose a significant portion of its rated capacitance at the operating voltage. ASC's sourcing and engineering team works through that full parameter set to identify in-production alternatives, with documentation to support your engineering approval. Include your part number and application details with your RFQ.
We're sourcing capacitors for an aerospace application with specific screening requirements. Can ASC support that?
Yes. ASC holds AS 9120:2016, ISO 9001:2015, and AS 6081:2012 certifications that support procurement for regulated applications. For orders requiring additional screening beyond standard incoming inspection, ASC's quality process includes X-ray analysis, SEM, EDX, and electrical testing, with extended testing available through its third-party lab network. Those labs hold additional certifications, including MIL-STD-750, MIL-STD-883, NAS 410 Level 3, and IDEA-ICE-3000. Certificates of conformance and full traceability documentation are available for capacitor orders. Include your screening requirements and any applicable specifications when you submit your RFQ.
A specific capacitor value in our production build has become difficult to source consistently. How does ASC support continuity of supply?
Availability problems with specific capacitor values typically trace back to over-concentration in a single supplier or manufacturing region. ASC's global sourcing team can assess open-market inventory across multiple regions and identify alternate manufacturer sources that meet your capacitance, voltage, and temperature specification. For ongoing production requirements, ASC's inventory management service can align stocking levels with your production schedule, reducing exposure to lead time spikes on parts that are critical to your build. If your current source has discontinued a value or tightened supply, the team can also evaluate whether a validated alternative from a different manufacturer resolves the gap without requiring an engineering change. Submit your requirement and production forecast with your RFQ.