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HomeProductsCapacitorsCeramic Capacitors12105U821JAT2A
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12105U821JAT2A - KYOCERA AVX

Manufacturer Part Number
12105U821JAT2A
Manufacturer
AVX (KYOCERA AVX)
Allelco Part Number
32D-12105U821JAT2A
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
218,250 pcs available, New & Original
Parts Description
CAP CER 820PF 50V C0G/NP0 1210
Package
1210 (3225 Metric)
Data sheet
12105U821JAT2A.pdf
RoHs Status
ROHS3 Compliant
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In stock: 218250

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Specifications

12105U821JAT2A Tech Specifications
KYOCERA AVX - 12105U821JAT2A technical specifications, attributes, parameters and parts with similar specifications to KYOCERA AVX - 12105U821JAT2A

Product Attribute Attribute Value
Manufacturer AVX (KYOCERA AVX)
Voltage - Rated 50V
Tolerance ±5%
Thickness (Max) 0.055" (1.40mm)
Temperature Coefficient C0G, NP0
Size / Dimension 0.126" L x 0.098" W (3.20mm x 2.49mm)
Series U
Ratings -
Package / Case 1210 (3225 Metric)
Product Attribute Attribute Value
Package Tape & Reel (TR)
Operating Temperature -55°C ~ 125°C
Mounting Type Surface Mount, MLCC
Lead Style -
Lead Spacing -
Height - Seated (Max) -
Features Ultra Low ESR
Capacitance 820 pF
Applications RF, Microwave, High Frequency

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8532.24.0020

Frequently Asked Questions(FAQ)

What makes the 12105U821JAT2A suitable for RF and microwave circuit applications compared to standard ceramic capacitors?
The 12105U821JAT2A is specified with C0G/NP0 dielectric material, which provides stable capacitance across the -55°C to 125°C operating range with minimal temperature coefficient drift. This stability is critical in RF and microwave designs where frequency-dependent performance and impedance matching cannot tolerate significant capacitance variation. The Ultra Low ESR characteristic of the 12105U821JAT2A reduces parasitic resistance losses at high frequencies, enabling lower insertion loss and improved Q-factor in resonant circuits and matching networks. Standard X7R or Y5V ceramics exhibit nonlinear capacitance changes with temperature and applied voltage, making them unsuitable for precision RF tuning and filtering applications where the 12105U821JAT2A's predictable behavior provides reliable circuit performance.
How does the 820 pF capacitance value of the 12105U821JAT2A relate to typical impedance and frequency matching requirements in high-frequency design?
The 820 pF nominal value of the 12105U821JAT2A falls within the mid-range for capacitive reactance calculations in L-band and S-band RF circuits (approximately 1–6 GHz). At 2 GHz, the 12105U821JAT2A presents an impedance of roughly 97 ohms; at 5 GHz, impedance drops to approximately 39 ohms. This capacitance range supports bypass and decoupling roles in VHF/UHF amplifier stages, and permits use in shunt-capacitive matching networks for moderate impedance transformations. The ±5% tolerance of the 12105U821JAT2A allows circuit designs to achieve within ±5–10% center frequency accuracy in narrowband applications, which is acceptable for most fixed-frequency RF modules, but tighter tolerance selection is recommended if frequency-critical performance or high-Q resonators demand closer control.
Can the 12105U821JAT2A be used in high-power RF applications, and what voltage derating strategy should be applied?
The 12105U821JAT2A is rated for 50V DC, which corresponds to a peak RF voltage handling capability dependent on applied waveform and duty cycle. For high-power pulsed RF or continuous-wave applications, operating the 12105U821JAT2A significantly below its 50V rating is necessary to prevent electromigration, dielectric breakdown, and premature aging. Industry practice recommends derat to 50–70% of rated voltage in high-power, high-duty-cycle RF designs; the 12105U821JAT2A can then safely handle transient RF peak voltages of approximately 25–35V without degradation. In lower-power or intermittent RF applications, the 12105U821JAT2A may operate closer to rated voltage. Thermal cycling and mechanical stress from repeated voltage transients accelerate capacitor aging, so thermal management and circuit protection (series inductance, current limiting) extend the service life of the 12105U821JAT2A in demanding RF environments.
How does the 1210 (3225 Metric) case size of the 12105U821JAT2A affect PCB layout and parasitic inductance in RF circuits?
The 1210 case dimensions (3.20 mm × 2.49 mm) of the 12105U821JAT2A represent a common tradeoff between compact footprint and parasitic inductance control. The internal lead structure and ceramic body of the 12105U821JAT2A introduce approximately 0.3–0.5 nH of self-inductance, which becomes significant above 1 GHz, creating series resonance with the 820 pF capacitance around 9–12 GHz. In PCB layout, mounting the 12105U821JAT2A with very short, wide traces and direct via-stitching to ground planes minimizes loop area and reduces parasitic series inductance to below 0.2 nH, preserving capacitive behavior up to 5–6 GHz. Larger case sizes (1812, 1825) would lower inductance slightly but increase PCB area; smaller cases (0805, 0603) would increase inductance relative to capacitance. For frequencies above 6 GHz, multiple smaller-value 12105U821JAT2A units in parallel can distribute current and reduce effective inductance.
What is the practical difference between C0G and NP0 temperature coefficient designations on the 12105U821JAT2A, and does it affect supplier sourcing?
The 12105U821JAT2A lists both C0G and NP0 designations because they define the same temperature coefficient class per different standards: C0G follows IEC 60384-14 and is used primarily in European specifications, while NP0 follows EIA/JEDEC RS-198 and is standard in North American aerospace and defense procurement. Both designations guarantee ≤±30 ppm/°C drift across the -55°C to 125°C range, meaning the 12105U821JAT2A's 820 pF value will remain within approximately 819 pF to 821 pF across this temperature extremes. When sourcing the 12105U821JAT2A, use whichever designator aligns with your supply chain documentation or regulatory framework; both ensure equivalent performance. However, always verify that the 12105U821JAT2A is explicitly marked with one of these designations, as lower-cost X7R alternatives may be substituted during sourcing, introducing unacceptable temperature drift in precision RF circuits.
Why is the 12105U821JAT2A specified with MSL 1 (Unlimited) moisture sensitivity, and what does this mean for manufacturing and storage?
The 12105U821JAT2A is rated MSL 1 (Unlimited), indicating that moisture absorption during storage does not require special handling constraints or timed reflow procedures. MSL 1 means the 12105U821JAT2A can remain in standard ambient humidity (up to 60% RH) indefinitely without risk of delamination, cracking, or internal corrosion upon soldering. This simplifies procurement and assembly logistics compared to MSL 2–3 components that demand dry-bake conditioning and time-limited exposure post-bake. For the 12105U821JAT2A, standard room-temperature storage in sealed desiccant bags is recommended for supply-chain hygiene but is not mandatory for functionality. However, vacuum-sealed or desiccant packaging remains prudent to prevent long-term oxidation of internal electrodes and to preserve the Ultra Low ESR characteristic by avoiding moisture-induced parasitic leakage.
How do the ±5% tolerance and C0G stability of the 12105U821JAT2A compare to tighter-tolerance alternatives, and when is the trade-off justified?
The 12105U821JAT2A is available with ±5% tolerance, which represents standard ceramic capacitor manufacturing precision. Tighter alternatives exist—such as ±2% or ±1%—but require additional sorting and screening by the manufacturer, increasing cost by 50–200% and lead time by 4–8 weeks. In RF matching networks and impedance transformations, the 12105U821JAT2A's ±5% tolerance contributes ±5% uncertainty to calculated impedance, which is acceptable for broadband designs with >10% frequency bandwidth. For fixed-frequency, high-Q resonators or precision phase shifters, tighter tolerance becomes necessary. Similarly, the C0G temperature coefficient of the 12105U821JAT2A ensures ±0.3% drift over -55°C to 125°C, compared to ±15% for X7R alternatives. The 12105U821JAT2A is cost-effective for most RF applications; tighter tolerance and temperature control should be pursued only when circuit performance modeling demonstrates that nominal ±5% variation exceeds acceptable limits.
What are the key soldering and assembly considerations specific to the 12105U821JAT2A, and how do reflow parameters affect long-term reliability?
The 12105U821JAT2A is supplied in Tape & Reel format for automated pick-and-place assembly. Standard reflow profiles (peak temperature 245–260°C, time-above-liquidus 60–90 seconds) are compatible with the 12105U821JAT2A's ceramic body and internal metallization. Avoid rapid thermal cycling during reflow, as the 12105U821JAT2A's ceramic material has a different coefficient of thermal expansion than the PCB substrate, creating mechanical stress at solder interfaces. Hand-soldering or localized heating of the 12105U821JAT2A should be avoided; if repair is necessary, infrared reflow or hot-air rework is preferred over iron soldering. The Ultra Low ESR specification of the 12105U821JAT2A depends on maintaining solder joint integrity; poor wetting, cold joints, or solder bridges degrade ESR performance and introduce losses in RF circuits. Post-reflow inspection (AOI) and electrical verification (ESR measurement at operating frequency) confirm that the 12105U821JAT2A meets functional requirements.
Is the 12105U821JAT2A suitable as a direct replacement for film or mica capacitors in legacy RF designs, or are there compatibility concerns?
The 12105U821JAT2A can functionally replace film or mica capacitors in many legacy RF circuits if the 820 pF value matches the original design intent. Advantages of the 12105U821JAT2A over film or mica alternatives include smaller footprint (1210 vs. typically much larger form factors), lower cost, and better high-frequency behavior due to lower parasitic inductance. However, compatibility depends on several factors: (1) ESR behavior—film and mica capacitors exhibit higher ESR at RF frequencies, so substituting the 12105U821JAT2A may reduce insertion loss and improve Q-factor, which can shift resonance frequencies by a few percent; (2) temperature coefficient—if the original design relied on temperature-dependent tuning or compensation, the stable C0G behavior of the 12105U821JAT2A may alter thermal response; (3) voltage stress—legacy designs may assume lower voltage stress due to larger physical size; the 12105U821JAT2A's 50V rating must be verified against circuit peak voltage requirements. Test the 12105U821JAT2A substitution in a prototype to confirm frequency response and temperature stability before production release.
What measurement or test data should be requested from suppliers to verify the Ultra Low ESR performance claim of the 12105U821JAT2A?
Suppliers of the 12105U821JAT2A should provide ESR measurements at relevant RF frequencies (typically 100 MHz, 1 GHz, or both) and temperature extremes (-55°C and 125°C) to substantiate the Ultra Low ESR specification. Typical ESR values for the 12105U821JAT2A range from 50–150 mΩ at 100 MHz and 100–300 mΩ at 1 GHz, depending on internal electrode design and solder-joint quality. Request ESR vs. frequency curves and dissipation factor (tan δ) data to assess performance in your specific frequency band. Additionally, request Q-factor plots (Q = 1 / (2π × f × ESR × C)) derived from measured ESR; for the 12105U821JAT2A at 1 GHz, Q typically ranges from 15–30, compared to 5–10 for standard X7R alternatives. Supplier test certificates or S-parameter files (when available) provide evidence that the 12105U821JAT2A meets the Ultra Low ESR claim. If these data are not available, request ESR samples or negotiate first-article inspection to verify the 12105U821JAT2A meets your loss-budget requirements before committing to high-volume orders.
How does the RoHS3 Compliance and REACH Unaffected status of the 12105U821JAT2A impact regulatory qualification for aerospace or medical device applications?
The 12105U821JAT2A is certified RoHS3 Compliant, confirming that lead, cadmium, chromium(VI), and other restricted substances are below European Directive limits. This is a baseline environmental requirement but does not automatically qualify the 12105U821JAT2A for aerospace or medical applications. Aerospace applications (e.g., DO-160G, ARP5754B) require additional qualification, such as single-event upset (SEU) testing, outgassing verification (per ASTM E595), and accelerated life testing under thermal and humidity stress. Medical device applications may require biocompatibility testing per ISO 10993 if the 12105U821JAT2A contacts biological tissue, though RF coupling applications often exempt passive components. The REACH Unaffected status of the 12105U821JAT2A indicates no Substances of Very High Concern (SVHCs) are present, simplifying EU market access. For regulated applications, consult the 12105U821JAT2A datasheet for specific certifications (IPC-A-610, MIL-PRF-123, etc.) and request qualification documentation from Kyocera AVX. If the 12105U821JAT2A is not pre-qualified for your application, budget for additional testing and lead time.
What are realistic cost and lead-time expectations for the 12105U821JAT2A compared to alternative 820 pF capacitor options, and how should supply-chain risk be managed?
The 12105U821JAT2A is a standard commodity product from a tier-one manufacturer (Kyocera AVX), with typical unit costs ranging from $0.08–$0.25 USD depending on volume (1k–100k) and market conditions. Lead times are normally 4–12 weeks for direct supply, though inventory may vary seasonally. Generic X7R 820 pF alternatives in the same 1210 case may cost 30–50% less but sacrifice temperature stability and ESR performance; specialty tighter-tolerance versions (±2%, ±1%) cost 50–200% more with 8–16 week lead times. To manage supply-chain risk, (1) qualify the 12105U821JAT2A with multiple distributors to avoid single-source dependencies; (2) establish long-lead-time alerts in your MRP system if production volumes exceed 10,000 units/month; (3) maintain a safety stock of 2–4 weeks of the 12105U821JAT2A for critical production lines; (4) consider secondary sources (alternative manufacturers) with equivalent C0G, 820 pF, 50V specifications as contingencies. Monitor market forecasts for ceramic capacitor availability; the 12105U821JAT2A may face allocation during industry supply constraints.
How should the 12105U821JAT2A be handled in multilayer PCB designs with internal ground planes, and does placement relative to ground vias affect RF performance?
Optimal placement of the 12105U821JAT2A in multilayer PCBs requires direct via-stitching to internal ground planes within 0.5–1 mm of the component pads. This minimizes ground return loop inductance, which is critical to preserve the Ultra Low ESR performance of the 12105U821JAT2A at frequencies above 1 GHz. The 12105U821JAT2A should be positioned close to the circuit node it decouples (e.g., near amplifier input or output) rather than routed with long traces. Via placement beneath and adjacent to the 12105U821JAT2A pads reduces effective series inductance from approximately 0.5 nH to under 0.2 nH, shifting the capacitor's self-resonant frequency (SRF) higher and maintaining capacitive behavior beyond 6 GHz. If the PCB uses buried or blind vias, ensure the 12105U821JAT2A vias extend through all signal layers to the primary ground plane; isolated local ground planes significantly degrade performance. For differential or balanced RF circuits, symmetrical placement of multiple 12105U821JAT2A units on both signal paths maintains impedance balance and reduces common-mode coupling.
What failure modes are most likely for the 12105U821JAT2A in field applications, and what preventive design measures reduce warranty claims?
The 12105U821JAT2A's primary failure modes in field service are (1) mechanical cracking due to thermal cycling (especially -55°C to 125°C extremes), which develops internal microfractures that increase ESR and leakage; (2) solder joint fatigue at the interface between ceramic and PCB, which can interrupt electrical connection or intermittently degrade ESR; (3) voltage overstress beyond the 50V rating, leading to dielectric puncture; (4) moisture-induced leakage in storage or transit (despite MSL 1 rating, condensation or immersion can accelerate corrosion). Preventive design measures include (1) mechanical reinforcement—solder the 12105U821JAT2A with sufficient solder volume and underfill epoxy in high-vibration applications; (2) thermal management—reduce dI/dt to minimize voltage transients that stress the 12105U821JAT2A's 50V rating; (3) circuit protection—series inductance or current-limiting resistors protect the 12105U821JAT2A from transient overvoltage; (4) environmental sealing—conformal coating or potting extends the 12105U821JAT2A's reliability in humid or corrosive environments. Field failure data for the 12105U821JAT2A typically show a Weibull bathtub curve with early-life infant mortality within the first 100 hours, a long stable operating region, and wear-out acceleration after 10,000–50,000 hours depending on thermal stress.

Parts with Similar Specifications

The three parts on the right have similar specifications to KYOCERA AVX 12105U821JAT2A

Product Attribute 12105U821JAT9A 12105U8R2BAT2A 12105U6R8BAT2A 12105U9R1CAT2A
Part Number 12105U821JAT9A 12105U8R2BAT2A 12105U6R8BAT2A 12105U9R1CAT2A
Manufacturer KYOCERA AVX KYOCERA AVX KYOCERA AVX KYOCERA AVX
Applications - - - -
Temperature Coefficient - - - -
Tolerance - - - -
Ratings - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Thickness (Max) - - - -
Capacitance - - - -
Voltage - Rated - - - -
Size / Dimension - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Mounting Type - Surface Mount Through Hole Surface Mount
Lead Spacing - - - -
Features - - - Simultaneous Sampling
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Series - - - -
Lead Style - - - -
Height - Seated (Max) - - - -

12105U821JAT2A Datasheet PDF

Download 12105U821JAT2A pdf datasheets and KYOCERA AVX documentation for 12105U821JAT2A - KYOCERA AVX.

Datasheets
Ceramic Chip Capacitor Catalog.pdf U Series, Ultra Low.pdf

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12105U821JAT2A Image

12105U821JAT2A

KYOCERA AVX
32D-12105U821JAT2A

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