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HomeProductsCapacitorsCeramic Capacitors12105U5R1CAT2A
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12105U5R1CAT2A - KYOCERA AVX

Manufacturer Part Number
12105U5R1CAT2A
Manufacturer
AVX (KYOCERA AVX)
Allelco Part Number
32D-12105U5R1CAT2A
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
178,360 pcs available, New & Original
Parts Description
CAP CER 5.1PF 50V NP0 1210
Package
1210 (3225 Metric)
Data sheet
12105U5R1CAT2A.pdf
RoHs Status
ROHS3 Compliant
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Specifications

12105U5R1CAT2A Tech Specifications
KYOCERA AVX - 12105U5R1CAT2A technical specifications, attributes, parameters and parts with similar specifications to KYOCERA AVX - 12105U5R1CAT2A

Product Attribute Attribute Value
Manufacturer AVX (KYOCERA AVX)
Voltage - Rated 50V
Tolerance ±0.25pF
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 5.1 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)

Why is the 12105U5R1CAT2A specified with C0G/NP0 temperature coefficient instead of X7R for RF applications?
The 12105U5R1CAT2A uses C0G/NP0 dielectric specifically because RF and microwave circuits require capacitance stability across the operating temperature range of -55°C to 125°C. X7R dielectrics exhibit significant capacitance drift (±15%) over temperature, which degrades filter response, impedance matching accuracy, and resonant frequency stability in tuned circuits. The 12105U5R1CAT2A maintains nearly zero capacitance change across temperature extremes, preserving circuit performance without requiring temperature compensation networks. This is especially critical in coupling, decoupling, and tuning applications where even 5% capacitance variation can cause measurable phase shift or frequency deviation.
What design considerations apply when using the 12105U5R1CAT2A in high-frequency filtering above 1 GHz?
At frequencies above 1 GHz, the 12105U5R1CAT2A's Ultra Low ESR characteristic becomes the dominant performance factor. Traditional ceramic capacitors exhibit resonant frequencies in the 2–5 GHz range; below resonance the capacitor behaves capacitive, above resonance it appears inductive. The 12105U5R1CAT2A's low ESR pushes the self-resonant frequency higher and flattens impedance response, extending usable capacitive behavior into the high-GHz region. Additionally, the 1210 (3225 Metric) package dimensions of 3.20mm × 2.49mm create minimal lead inductance on modern RF PCBs, reducing parasitic effects. For frequencies approaching or exceeding 2 GHz, layout must minimize trace lengths between the 12105U5R1CAT2A pads and connected components, as even 5mm of trace adds significant series inductance that can neutralize capacitive benefit.
How does the ±0.25pF tolerance of the 12105U5R1CAT2A affect tunable RF circuit design?
At 5.1 pF nominal value, the ±0.25pF tolerance represents a ±4.9% band around the target capacitance. In fixed tuning applications such as impedance matching networks or LC filters, this tolerance is typically acceptable because matching circuits are designed with component value ranges in mind. However, in voltage-tunable or mechanically-tuned RF systems where the 12105U5R1CAT2A serves as a reference or fixed element alongside variable components, the tolerance can shift resonant frequency by 20–50 MHz depending on circuit Q-factor. Circuit designers often implement tolerance stack-up analysis by selecting 12105U5R1CAT2A units from the middle of the tolerance band during initial design, then verifying performance across the full ±0.25pF range during prototype testing. For critical resonant frequency applications, tighter tolerance variants or post-tuning adjustment may be required.
Is the 12105U5R1CAT2A suitable for direct replacement of older 1206-package 5.1pF capacitors in legacy RF designs?
The 12105U5R1CAT2A uses the 1210 package (3.20mm × 2.49mm), which is physically larger than the 1206 package (3.2mm × 1.6mm width), so direct footprint replacement is not possible without PCB redesign. However, electrical substitution is feasible in many cases. The 12105U5R1CAT2A's C0G/NP0 dielectric and Ultra Low ESR typically improve high-frequency performance compared to older 1206 equivalents, reducing insertion loss and temperature drift. The main constraint is PCB routing: the 1210 package requires adequate spacing from neighboring components due to its increased width. In space-constrained designs, the larger package footprint may conflict with trace routing or component placement, requiring localized layout modifications. Designers should verify the 50V rating matches or exceeds the legacy design specification; many older circuits used 50V or 100V rated capacitors, so the 12105U5R1CAT2A's 50V maximum voltage is at parity with common historical choices.
What is the practical difference between MSL 1 (Unlimited) moisture sensitivity and typical MSL 2A or 2B ratings for the 12105U5R1CAT2A?
The 12105U5R1CAT2A carries MSL 1 (Unlimited) rating, meaning it requires no moisture-controlled storage, baking, or floor-life management after manufacture. Standard MSL 2A or 2B capacitors must be stored in dry-pack with desiccant and have a floor-life limit (typically 168 hours at 30°C / 60% RH) before reflow soldering; exceeding floor-life risks moisture-induced cracking or popcorning during thermal shock. For high-volume RF manufacturing facilities, the 12105U5R1CAT2A's MSL 1 status reduces logistics complexity and supply chain risk by eliminating bake-out procedures before soldering. In low-volume or prototype environments, this advantage is less pronounced, but the 12105U5R1CAT2A still permits extended bench storage without performance degradation. This feature is particularly valuable in aerospace or medical device workflows where component traceability and storage history documentation are stringent requirements.
How should PCB layout be optimized for the 12105U5R1CAT2A in a 50V RF amplifier input matching network?
Input matching networks using the 12105U5R1CAT2A operate at 50V, placing the capacitor near peak signal voltage nodes in high-power RF amplifiers. Layout must minimize the distance between the 12105U5R1CAT2A pads and adjacent circuit nodes to reduce series inductance, which acts counter to capacitive tuning. Recommended practice is to place the 12105U5R1CAT2A within 2–3mm of the amplifier input transistor or matching network junction, using wide (0.25–0.50mm) traces routed directly to minimize loop area. Via placement is equally critical: both pads should have dedicated vias to ground or power planes positioned immediately adjacent to the pad perimeter. For the 1210 package (3.20mm × 2.49mm), avoid routing high-speed digital signals or switching currents on adjacent layers directly beneath the capacitor, as crosstalk can introduce impedance modulation at RF frequencies. Ground plane continuity beneath the 12105U5R1CAT2A is essential; ensure no splits or gaps in the ground plane within a 5mm radius of the capacitor.
Why might the 12105U5R1CAT2A exhibit capacitance drift over extended RF operating life compared to film capacitors?
The 12105U5R1CAT2A is a ceramic multilayer capacitor (MLCC); ceramic dielectrics are subject to long-term aging under combined thermal stress, DC electric field, and AC RF signal cycling. Over months to years of continuous RF operation at elevated temperature (e.g., 85°C ambient in an outdoor RF transceiver), capacitance can drift 2–5% from the initial measured value, even with C0G/NP0 dielectric specification. Film capacitors (polypropylene, polyester) exhibit lower aging rates but are unsuitable for the 1210 (3.20mm × 2.49mm) footprint and RF frequency demands due to higher ESR. For critical RF frequency-reference or impedance-matching applications requiring long-term stability, designers may implement periodic re-tuning through software-controlled varactor capacitors or mechanical trimmer adjustment alongside the fixed 12105U5R1CAT2A network. In consumer RF products with expected lifetime under 5 years, aging effects are typically within acceptable margins and do not require mitigation.
Can the 12105U5R1CAT2A be safely used in parallel with other capacitors to achieve higher total capacitance in RF tuning networks?
Paralleling the 12105U5R1CAT2A with other capacitors to increase tuning range is electrically valid but introduces mechanical and performance coupling effects. When two capacitors are placed in close proximity (e.g., parallel tuning elements in a matching network), electromagnetic coupling between component leads can create unexpected impedance peaks or impedance nulls at specific RF frequencies, degrading filter response. To minimize coupling, parallel capacitors should be separated by at least 5–10mm and routed with independent via connections to ground, avoiding common series traces. The C0G/NP0 temperature coefficient of the 12105U5R1CAT2A also implies that any paralleled capacitor should have similar temperature drift characteristics; mixing the 12105U5R1CAT2A with X7R or other dielectrics will cause frequency shift as temperature changes. For applications requiring continuously variable capacitance (e.g., automatic tuning), replacing parallel fixed capacitors with a single varactor diode is often superior, since the 12105U5R1CAT2A fixed element can then serve as a temperature-stable reference point rather than contributing to frequency drift.
What failure modes are typical for the 12105U5R1CAT2A under ESD stress, and how should ESD protection be designed?
The 12105U5R1CAT2A, while rated for 50V DC operation, can fail under electrostatic discharge (ESD) events exceeding 2–4 kV human body model (HBM) without external protection. ESD-induced failures manifest as internal micro-fractures in the ceramic dielectric, causing immediate short-circuit or gradual leakage-current increase over hours to weeks. In RF receiver front-end designs where the 12105U5R1CAT2A appears in the signal path near an antenna connector, external ESD protection devices (transient suppression diodes, varistors) should be placed upstream of the 12105U5R1CAT2A. These devices are typically connected between signal and ground, shunting ESD current before it reaches the capacitor. For the 1210 package, the small size permits integrated ESD networks on the PCB without significant space impact. Manufacturers' ESD testing typically follows IEC 61000-4-2 standards; confirming the 12105U5R1CAT2A is rated for the expected ESD environment (e.g., IEC 4 level = 4 kV contact, 8 kV air gap) is essential for reliable RF receiver operation in harsh electromagnetic environments.
How does the 12105U5R1CAT2A compare to varactor diodes for tunable RF impedance matching in terms of linearity and phase noise?
The 12105U5R1CAT2A is a fixed capacitor; varactor diodes are voltage-tunable semiconductor devices offering dynamic capacitance adjustment. In fixed impedance-matching networks, the 12105U5R1CAT2A introduces no nonlinearity and contributes no phase noise, since capacitance is independent of signal amplitude. Varactor tuning networks, by contrast, exhibit capacitance modulation at RF signal frequency (intermodulation), introducing harmonic distortion and phase noise sidebands that degrade receiver sensitivity and transmitter spectral purity. However, varactor networks achieve continuous tuning range (often 3:1 or higher), whereas the 12105U5R1CAT2A provides fixed capacitance unless paralleled with multiple discrete elements or varactor stages. Hybrid designs combining a fixed 12105U5R1CAT2A tuning core with a varactor fine-tuning element are common in adaptive RF systems: the 12105U5R1CAT2A ensures low-noise baseline performance while the varactor compensates for component tolerances or temperature drift. For linearity-critical applications (e.g., wideband receiver front-ends), the 12105U5R1CAT2A is preferred; for adaptively tuned transmitter power amplifiers, varactor integration is often necessary.
What PCB material selection and dielectric thickness requirements optimize RF performance with the 12105U5R1CAT2A?
The 12105U5R1CAT2A's Ultra Low ESR benefit is maximized on PCB substrates with low-loss dielectric constant stability. Standard FR-4 exhibits dielectric loss tangent (tan δ) of approximately 0.02 at 1 GHz, causing 3–5% signal attenuation in coupling and filtering networks. High-frequency RF PCB materials such as Rogers RO4003, Taconic TLY, or Isola IS410 reduce tan δ to 0.003–0.008, improving Q-factor and reducing insertion loss by 50–70% compared to FR-4. The 12105U5R1CAT2A should be mounted on the primary signal layer (typically 0.5–1.0mm from the surface) with adjacent ground plane on the inner layer at 4–6mil separation to minimize parasitic inductance. Microstrip trace impedance (characteristic impedance = 50Ω) connected to the 12105U5R1CAT2A should maintain consistent width and spacing; transitions from matching-network traces to component pads should use smooth curves or tapered transitions rather than sharp angles, reducing discontinuity-induced reflections. For frequencies above 5 GHz, stripline construction (capacitor traces sandwiched between two ground planes) further reduces radiation loss and crosstalk affecting the 12105U5R1CAT2A's effective performance.
Does the 12105U5R1CAT2A's 50V rating limit its use in higher-voltage RF power amplifier designs?
The 12105U5R1CAT2A is rated for 50V maximum DC voltage; in RF power amplifiers operating at 48V or 28V supply rails, the capacitor is safely applied at or below its voltage rating. However, RF signal voltage can exceed DC bias in certain matching network topologies: for example, in a series-tuned matching circuit with high-Q resonance, RF voltage swing can reach 1.5–2× the DC voltage, potentially exceeding 50V peak. Circuit designers must perform RF voltage stress analysis by calculating voltage distribution across matching network elements using simulation (SPICE, circuit simulation) or hand calculation of reactive impedance. If peak RF voltage exceeds 50V at any node, the 12105U5R1CAT2A must be derated or replaced with a higher-voltage variant. For power amplifiers exceeding 50V supply voltage (e.g., 100V supply in some industrial RF systems), the 12105U5R1CAT2A is unsuitable; component substitution with 100V or 200V rated equivalents is required. The trade-off is increased package size and slightly higher ESR in higher-voltage variants, affecting matching network Q-factor and insertion loss.
How should the 12105U5R1CAT2A be tested and validated during prototype RF circuit characterization?
Initial validation of the 12105U5R1CAT2A in a prototype RF circuit typically involves three stages: (1) DC capacitance measurement using a precision LCR meter (typical accuracy ±0.1pF at 1 MHz) to confirm the nominal 5.1 pF value falls within the ±0.25pF tolerance band; (2) RF impedance measurement using a network analyzer (S-parameter measurement) at the target RF frequency (e.g., 400 MHz for cellular, 2.4 GHz for ISM band) to verify ESR and Q-factor match component datasheet specifications; (3) temperature cycling (-55°C to +125°C) with capacitance re-measurement to confirm C0G/NP0 stability across the operating range. For matching networks, S-parameter measurement of the complete matching circuit (input reflection coefficient, gain flatness) confirms the 12105U5R1CAT2A contributes expected impedance transformation without unexpected resonances. Thermal imaging during RF operation verifies the 12105U5R1CAT2A does not exhibit hot spots indicating dielectric loss or ESR overheating. If measured performance deviates >5% from simulation, likely causes include PCB layout parasitic inductance (trace length, via placement) or component lead inductance; corrective layout modifications should be implemented and re-tested.

Parts with Similar Specifications

The three parts on the right have similar specifications to KYOCERA AVX 12105U5R1CAT2A

Product Attribute 12105U511FAT2A 12105U6R2CAT2A 12105U561FAT2A 12105U6R8CAT2A
Part Number 12105U511FAT2A 12105U6R2CAT2A 12105U561FAT2A 12105U6R8CAT2A
Manufacturer KYOCERA AVX KYOCERA AVX KYOCERA AVX KYOCERA AVX
Series - - - -
Thickness (Max) - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Voltage - Rated - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Mounting Type - Surface Mount Through Hole Surface Mount
Tolerance - - - -
Lead Spacing - - - -
Features - - - Simultaneous Sampling
Temperature Coefficient - - - -
Capacitance - - - -
Lead Style - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Applications - - - -
Height - Seated (Max) - - - -
Ratings - - - -
Size / Dimension - - - -

12105U5R1CAT2A Datasheet PDF

Download 12105U5R1CAT2A pdf datasheets and KYOCERA AVX documentation for 12105U5R1CAT2A - KYOCERA AVX.

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

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12105U5R1CAT2A Image

12105U5R1CAT2A

KYOCERA AVX
32D-12105U5R1CAT2A

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