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HomeProductsCapacitorsCeramic Capacitors12105U9R1DAT2A
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12105U9R1DAT2A - KYOCERA AVX

Manufacturer Part Number
12105U9R1DAT2A
Manufacturer
AVX (KYOCERA AVX)
Allelco Part Number
32D-12105U9R1DAT2A
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
244,080 pcs available, New & Original
Parts Description
CAP CER 9.1PF 50V NP0 1210
Package
1210 (3225 Metric)
Data sheet
12105U9R1DAT2A.pdf
RoHs Status
ROHS3 Compliant
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Specifications

12105U9R1DAT2A Tech Specifications
KYOCERA AVX - 12105U9R1DAT2A technical specifications, attributes, parameters and parts with similar specifications to KYOCERA AVX - 12105U9R1DAT2A

Product Attribute Attribute Value
Manufacturer AVX (KYOCERA AVX)
Voltage - Rated 50V
Tolerance ±0.5pF
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 9.1 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)

What makes the 12105U9R1DAT2A suitable for RF and microwave circuit design compared to standard ceramic capacitors?
The 12105U9R1DAT2A is specified with C0G/NP0 temperature coefficient and ultra-low ESR characteristics, which are critical for RF applications where impedance stability and minimal signal loss are required. The C0G/NP0 dielectric ensures capacitance variation remains below ±30 ppm/°C across the -55°C to 125°C operating range, preventing frequency drift in tuned circuits and resonant topologies. The 9.1 pF nominal value with ±0.5 pF tolerance in the 1210 package provides tight initial accuracy needed for impedance matching networks operating at microwave frequencies, where even small capacitance deviations translate to measurable reflection coefficients.
Can the 12105U9R1DAT2A handle transient voltage spikes exceeding its 50V rating in high-frequency switching circuits?
The 12105U9R1DAT2A is rated for 50V DC and should not be subjected to sustained overvoltage. However, transient spike margins depend on peak voltage duration and repetition rate. For RF applications with fast edge rates, inductive kick-back from trace inductance or coupling transformers can generate voltage transients. The 1210 package size and MLCC construction of the 12105U9R1DAT2A provide some mechanical robustness, but reliability degrades rapidly above the rated voltage. Design practice recommends selecting capacitors with voltage headroom—typically 1.5× to 2× the maximum expected voltage—so a 100V alternative may be warranted if switching transients exceed 50V peaks, despite the 12105U9R1DAT2A's compact form factor.
How does the ±0.5pF tolerance of the 12105U9R1DAT2A affect precision impedance matching at millimeter-wave frequencies?
At millimeter-wave frequencies (above 30 GHz), wavelength becomes comparable to PCB trace dimensions, and parasitic reactance dominates intentional component values. The 12105U9R1DAT2A's ±0.5 pF tolerance represents ±5.5% of the nominal 9.1 pF value—a significant window for impedance control. At 10 GHz, a 0.5 pF variation shifts impedance by approximately 3–4 ohms in a 50-ohm network, potentially degrading return loss by 0.5–1 dB. For wideband matching, the 12105U9R1DAT2A tolerance is manageable through empirical tuning or Monte Carlo simulation. For narrow-band high-Q circuits, source-measure units or parallel/series combinations may be required to achieve tighter effective tolerance than the 12105U9R1DAT2A alone provides.
What is the typical insertion loss and Q-factor of the 12105U9R1DAT2A at 1 GHz and 10 GHz?
The 12105U9R1DAT2A is specified with ultra-low ESR construction, typical of modern MLCC designs, which generally exhibit ESR values in the range of 50–200 mΩ at 1 GHz for small-value high-frequency capacitors. At 1 GHz, the insertion loss is typically below 0.3 dB for a series element. At 10 GHz, ESR increases slightly due to dielectric and conductor losses, and insertion loss may reach 0.5–0.8 dB, depending on PCB layout and lead inductance. The effective Q-factor of the 12105U9R1DAT2A (Q = 1/(ωESR·C)) is approximately 35–50 at 1 GHz and 20–30 at 10 GHz. These values are typical for NP0 MLCCs in the 1210 package; precise measurements require network analyzer characterization on the specific PCB and mounting geometry.
How should the 12105U9R1DAT2A be soldered to minimize parasitic inductance in RF circuits?
The 12105U9R1DAT2A in 1210 package format has pad spacing of approximately 3.2 mm length. Parasitic inductance arises from solder joint geometry, lead thickness, and trace routing. Best practices include: (1) use short, wide PCB traces (≥10 mils) connected directly to component pads to minimize loop area; (2) position the 12105U9R1DAT2A close to the RF node it is filtering or matching; (3) employ buried vias or star grounding to return RF current to ground plane efficiently; (4) avoid 90° trace bends near the capacitor pads; (5) use reflow soldering to ensure consistent solder fillet geometry. The combined parasitic inductance of the 12105U9R1DAT2A, solder joints, and PCB traces typically ranges from 200–500 pH at microwave frequencies, which can degrade high-frequency performance if not controlled. Measurement via time-domain reflectometry (TDR) or VNA can validate the mounted structure.
Is the 12105U9R1DAT2A suitable for coupling and decoupling in low-noise LNA front-ends, and what are the tradeoffs versus larger package sizes?
The 12105U9R1DAT2A's 9.1 pF value and ultra-low ESR make it suitable for interstage coupling in LNA circuits where noise figure is critical. The small capacitance value provides high impedance at low frequencies (blocking bias) while maintaining relatively low impedance at RF operating frequencies. The 1210 package offers a compact footprint—beneficial for dense PCB layouts in phased arrays or multi-channel systems—but introduces slightly higher parasitic inductance compared to larger packages. The 12105U9R1DAT2A's C0G/NP0 dielectric ensures phase linearity and low distortion across temperature and bias voltage variations, which preserves noise figure stability. For applications requiring maximum noise performance, the 12105U9R1DAT2A is preferred over general-purpose X7R dielectrics. However, if higher capacitance or lower ESR is needed, transitioning to a 1206 or 1218 package may offer trade-offs in board real estate versus electrical performance.
What is the moisture sensitivity risk of the 12105U9R1DAT2A, and does MSL 1 rating eliminate reflow concerns?
The 12105U9R1DAT2A is rated MSL 1 (Unlimited), meaning it has essentially no moisture absorption risk and does not require dry-pack storage or bake-out prior to reflow. This is a significant advantage over higher MSL components in high-volume or just-in-time manufacturing environments. MSL 1 status for the 12105U9R1DAT2A is conferred by the NP0 dielectric formulation and robust encapsulation; the component can be stored at room temperature and humidity indefinitely without performance degradation. However, MSL 1 refers only to moisture-induced cracking risk during soldering, not to electrical property changes. The 12105U9R1DAT2A is still subject to standard IPC solder reflow profiles (peak temperature 245–260°C), and mechanical stress from thermal cycling can cause solder joint fatigue over extended operational life, particularly in aerospace or automotive applications with wide temperature swings.
How does the 12105U9R1DAT2A compare to thin-film or chip-scale alternatives for precision RF filtering applications?
The 12105U9R1DAT2A is an MLCC (multilayer ceramic capacitor) offering mass production scalability and cost efficiency, whereas thin-film or chip-inductor-capacitor hybrids provide superior tolerance and temperature stability. The 12105U9R1DAT2A's ±0.5 pF tolerance is acceptable for most RF matching networks but falls short of precision filter applications requiring ±0.1 pF or tighter. Thin-film alternatives (typically ±1% or ±0.05 pF) command 3–5× higher per-unit cost and may have longer lead times. The 12105U9R1DAT2A's ultra-low ESR is comparable to thin-film performance at gigahertz frequencies, making it suitable for low-loss filters. However, thin-film solutions offer superior linearity (lower intermodulation distortion) in high-power RF switches or mixers. For commercial applications, the 12105U9R1DAT2A represents the optimal balance of performance, cost, and availability; precision applications or military-grade systems may justify thin-film investment.
What temperature coefficient behavior should be expected from the 12105U9R1DAT2A during rapid thermal transients in pulsed RF systems?
The 12105U9R1DAT2A specifies C0G/NP0 temperature coefficient with typical deviation of ±30 ppm/°C maximum across -55°C to 125°C. During pulsed RF operation, self-heating within the 12105U9R1DAT2A can raise the capacitor's internal temperature above ambient. If RF pulse power dissipates 50–100 mW in the 9.1 pF element over 10–100 μs durations, localized temperature rises of 5–15°C are plausible depending on thermal conductivity of the surrounding PCB and potting material. The resulting capacitance shift is approximately 150–450 ppm per pulse, causing center frequency drift in resonant circuits. For applications with repetitive or long-duration RF bursts, thermal management via increased copper area, thermal vias, or reduced duty cycle is recommended. Characterization via thermographic imaging or embedded temperature sensors can quantify the 12105U9R1DAT2A's thermal response and validate circuit stability margins.
Can the 12105U9R1DAT2A be used in parallel with other capacitors to achieve lower effective tolerance or capacitance tuning in resonant filters?
Yes, parallel combination of multiple 12105U9R1DAT2A units can reduce effective tolerance and enable capacitance tuning. If two 12105U9R1DAT2A capacitors (each 9.1 pF ±0.5 pF) are connected in parallel, the combined value is nominally 18.2 pF with tolerance of ±0.7 pF (±3.8%), which is tighter than a single 18 pF capacitor with typical ±5% tolerance. For resonant frequency tuning, a fixed network of 12105U9R1DAT2A units can be combined with a variable capacitor or trimmer to allow fine adjustment while maintaining the high-Q, low-loss characteristics of the 12105U9R1DAT2A. Physically, parallel combination increases trace inductance slightly; use star topology or Kelvin connection to minimize loop area. Temperature coefficient tracking between parallel 12105U9R1DAT2A elements is excellent (all NP0 dielectric), so frequency stability of the parallel combination remains predictable across temperature.
What is the maximum operating frequency limit of the 12105U9R1DAT2A before parasitic resonances dominate performance?
The 12105U9R1DAT2A exhibits self-resonant frequency (SRF) typically in the range of 8–12 GHz, depending on trace inductance and mounting geometry. Above SRF, the capacitor impedance transitions from capacitive to inductive, degrading filtering performance. For the 9.1 pF nominal value, impedance reaches minimum (equal to ESR, typically 50–150 mΩ) near 10 GHz; beyond this point, inductive reactance dominates. Practical design guidance restricts use of the 12105U9R1DAT2A to frequencies below approximately 5 GHz for coupling/decoupling applications, where capacitive behavior is assured. At 10 GHz and above, the 12105U9R1DAT2A can still function in matching or tuning networks but requires electromagnetic simulation to predict actual impedance. For applications above 10 GHz (millimeter-wave), alternative topologies such as distributed transmission-line elements or lumped inductors paired with the 12105U9R1DAT2A may offer more predictable performance.
Does the 12105U9R1DAT2A exhibit nonlinear capacitance behavior under high RF signal levels, and what are voltage-handling limits for low-distortion applications?
MLCC capacitors, including the 12105U9R1DAT2A, exhibit voltage-dependent capacitance (VCC) due to the nonlinear dielectric response of the ceramic material. For the 12105U9R1DAT2A at 50V rating, VCC is typically ±3–5% across 0–50V bias. This nonlinearity introduces harmonic distortion and intermodulation products in high-power RF circuits. A 1V RF signal superimposed on 25V DC bias will see approximately 1–2% capacitance modulation, generating third-order intermodulation distortion (IMD3) at a level dependent on RF impedance and network Q. For low-distortion applications (communications, instrumentation), the 12105U9R1DAT2A should be operated at <10V bias and ≤100 mV RF signal amplitude to keep nonlinear effects below -80 dBc. High-power RF power amplifier output matching may tolerate higher distortion; characterization via harmonic or IMD bench measurement is necessary. NP0 dielectrics like the 12105U9R1DAT2A exhibit lower VCC than X7R or X5R types, making it the preferred choice for linearity-critical applications.

Parts with Similar Specifications

The three parts on the right have similar specifications to KYOCERA AVX 12105U9R1DAT2A

Product Attribute 12105U9R1CAT2A 12105U9R1BAT2A 12105U8R2BAT2A 12105U6R8BAT2A
Part Number 12105U9R1CAT2A 12105U9R1BAT2A 12105U8R2BAT2A 12105U6R8BAT2A
Manufacturer KYOCERA AVX KYOCERA AVX KYOCERA AVX KYOCERA AVX
Size / Dimension - - - -
Voltage - Rated - - - -
Height - Seated (Max) - - - -
Features - - - Simultaneous Sampling
Applications - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Thickness (Max) - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Lead Spacing - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Capacitance - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Series - - - -
Lead Style - - - -
Tolerance - - - -
Ratings - - - -
Temperature Coefficient - - - -

12105U9R1DAT2A Datasheet PDF

Download 12105U9R1DAT2A pdf datasheets and KYOCERA AVX documentation for 12105U9R1DAT2A - KYOCERA AVX.

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

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    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

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    one of my hobbies is skydiving. and when i'm skydiving this works great.

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12105U9R1DAT2A Image

12105U9R1DAT2A

KYOCERA AVX
32D-12105U9R1DAT2A

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