High-Q RF multilayer ceramic capacitors are often compared by footprint first, but in real RF and microwave circuits the decisive parameters are ESR, Q factor, thermal endurance, voltage headroom, and the availability of the right capacitance range in the required case size.
This article presents a useful benchmark example as of June 2026 public information on leading High-Q RF MLCC manufacturers that go beyond brand familiarity and look at how leading series from manufacturers such as Exxelia, Kyocera AVX, Johanson Technology, Knowles, and Dalicap map to actual design constraints in filters, matching networks, oscillators, power amplifiers, MRI coils, and industrial RF systems.
Key Takeaways
- The 0505 case size remains the workhorse for intermediate-power RF functions such as filters and antenna matching, with Exxelia SHA, Kyocera AVX 700A, and Dalicap DLC70A covering roughly 0.1 pF to 1000 pF, while Knowles C11 is more concentrated in the lower-capacitance range up to about 100 pF in high reliability series.
- In 1111 high-power RF capacitors, temperature capability is a major selection axis: Exxelia SHB and Dalicap DLC70B are listed up to 175°C across their range, while Johanson S42E is shown at 150°C and Kyocera AVX 700B at 125°C with only a partial range extending to 175°C.
- Smaller precision formats such as 0603 and 0805 remain important for filter networks and oscillators, but voltage capability is no longer uniform, with Exxelia SHF in 0805 extending to 1000 V while competing 0805 families in the benchmark sit around 250 V to 500 V.
- In extreme RF power applications, the 4040 format becomes relevant because the compared families reach about 7200 V, while capacitance range still varies substantially from one supplier to another.
- A selection process should start from thermal profile, voltage stress, ESR/Q requirements, non-magnetic needs, and fixed footprint constraints rather than from existing supplier preference.
Scope of the Benchmark
In RF and microwave engineering, capacitance value alone rarely predicts in-circuit performance. Two capacitors with the same nominal value and package can behave very differently once current density, self-heating, dielectric stability, and RF loss are taken into account.
That is especially true in modern designs that push multiple stress mechanisms at once, such as GaN power amplifiers, MRI resonant circuits, semiconductor plasma generators, or compact high-voltage matching networks. In these cases, the engineer is effectively benchmarking thermal design, breakdown margin, ESR, and portfolio completeness as much as the capacitor itself.
This comparison focuses on publicly described High-Q porcelain RF MLCC families and groups them by the case sizes most often used in practical RF design reviews: 0505, 0603, 0805, 1111, and 4040. The most useful comparison points in the source guide are dielectric family, maximum rated voltage, maximum operating temperature, capacitance span, and any explicit technical distinction such as ultra-low ESR or non-magnetic construction.
0505 Case Size For Intermediate-Power RF
The 0505 footprint remains one of the most familiar RF MLCC formats for intermediate-power stages, filters, and antenna matching networks. In this benchmark, Exxelia SHA including the R12N option, Kyocera AVX 700A, Dalicap DLC70A, and Knowles C11 all sit in the High-Q NPO dielectric category with a common maximum voltage of 250 V.
0505 Series Snapshot
| Feature | Exxelia SHA / R12N | Kyocera AVX 700A | Dalicap DLC70A | Knowles C11 |
| Dielectric | NPO | NPO | NPO | NPO |
| Max voltage | 250 V | 250 V | 250 V | 250 V |
| Capacitance range | 0.1 pF to 1000 pF | 0.1 pF to 1000 pF | 0.1 pF to 1000 pF | 0.1 pF to 100 pF |
| Technical emphasis | Ultra-low ESR and non-magnetic as standard | Widely used High-Q range | Broad coverage across 0.1–1000 pF | Portfolio oriented to high-reliability applications |
The practical difference inside this common 250 V / NPO baseline is portfolio emphasis rather than a fundamental change of dielectric class. Exxelia’s R12N option is notable in the guide because it is explicitly tied to ultra-low ESR and high-current handling in the compact 0505 package, which is relevant in filters or matching networks where insertion loss and local heating matter.
By contrast, Knowles C11 is narrower in capacitance coverage, which can still be perfectly acceptable in narrow-band RF functions that need relatively low values and is oriented toward high-reliability applications. This makes 0505 selection less about headline voltage and more about current handling, loss, non-magnetic requirements, and how much capacitance flexibility is needed without resizing the layout.
1111 Case Size For High-Power RF
The 1111 package is where thermal endurance becomes a central specification rather than a secondary check box. The source comparison places Exxelia SHB, Kyocera AVX 700B, Johanson S42E, and Dalicap DLC70B side by side for applications such as GaN and LDMOS power amplifiers, MRI coils, and 5G infrastructure.
1111 Series Snapshot
| Feature | Exxelia SHB | Kyocera AVX 700B | Johanson S42E | Dalicap DLC70B |
| Dielectric | NPO | NPO | NPO | NPO |
| Standard max temperature | 175°C | 125°C, with 175°C partial range | 150°C | 175°C |
| Max voltage | Up to 1500 V | Up to 1500 V | Up to 1000 V | Up to 1500 V |
This section of the benchmark is valuable because it highlights that high-power RF capacitors are not differentiated by footprint alone. Once self-heating enters the picture, operating temperature and full-range availability at elevated temperature become part of the reliability discussion, especially in power amplifiers or resonant systems exposed to continuous stress.
A practical interpretation is that SHB and DLC70B are particularly relevant when the application environment consistently runs hot or has limited cooling margin, because the guide identifies both as 175°C families across the capacitance range. Johanson S42E and Kyocera AVX 700B remain relevant alternatives where thermal conditions are more moderate or where the design envelope does not demand full-range 175°C operational environment.
0603 And 0805 For Precision And Super High-Q Functions
In smaller footprints such as 0603 and 0805, the benchmark shifts toward precision and low-loss signal handling in filter networks, oscillators, and timing circuits. The guide groups Exxelia SHS and SHF, Kyocera AVX 600S and 600F, Johanson R14S and R15S, and Dalicap DLC70P and DLC70D into this category.
0603 And 0805 Snapshot
| Feature | Exxelia SHS / SHF | Kyocera AVX 600S / 600F | Johanson R14S / R15S | Dalicap DLC70P / DLC70D |
| 0603 series | SHS | 600S | R14S | DLC70P |
| 0805 series | SHF | 600F | R15S | DLC70D |
| Dielectric | NPO | NPO | NPO | NPO |
| Max voltage in benchmark | Up to 1000 V | 250 V | 250 V | 500 V |
The most striking point in this part of the guide is not the dielectric, which remains consistent, but the widening spread in voltage capability. Exxelia SHF is highlighted as reaching up to 1000 V with a standard operating temperature of 150°C in these compact formats, while the compared alternatives in 0805 sit notably lower in voltage ceiling.
That difference matters in dense RF systems where small footprints must absorb both frequency-sensitive behavior and elevated electrical stress. At the same time, for many oscillator and narrow-band filter applications, the deciding factor will still be ESR, Q factor, and tolerance stability rather than the highest available voltage rating.
4040 For Extreme RF Power And Voltage
Once RF systems move into MRI, plasma generation, or industrial heating, standard SMD formats may no longer provide enough voltage and power margin. The benchmark therefore includes the 4040 case size through Exxelia CLE, Dalicap DLC70E, Kyocera AVX 700E, and Knowles C40.
4040 Series Snapshot
| Feature | Exxelia CLE | Dalicap DLC70E | Kyocera AVX 700E | Knowles C40 |
| Max voltage | 7200 V | 7200 V | 7200 V | 7200 V |
| Capacitance range | 1 pF to 10000 pF | 1 pF to 5100 pF | 1 pF to 2200 pF | 1 pF to 5100 pF |
| Dielectric / TCC note | NPO, 0 ± 30 ppm/°C | NPO | NPO | NPO |
At this level, voltage parity does not mean application parity. Capacitance range, available current data, and the possibility of customized optimization for RF breakdown become more meaningful than simple top-line voltage because the actual operating margin depends strongly on frequency, waveform, and thermal conditions.
The source guide also notes that custom design work can improve RF breakdown voltage substantially in specific cases, citing an example where a 47 pF device at 50 MHz could be optimized from 6 kV to 8.8 kV. That is a reminder that extreme-power RF capacitor selection often moves beyond catalogue comparison and into application-specific engineering support.
Cross-Reference Utility For Engineers
The guide includes a practical cross-reference table that maps competitor families such as AVX 100A, 800B / 700B, 600S, 600F, and 100E; Johanson R14S, R15S, and S42E; Dalicap DLC10A and DLC70B; Knowles C11, C17 and Exxelia families such as SHA / R12N, SHB, SHS, SHF, CLE, and CLX. Used carefully, this kind of mapping is useful for preliminary second-sourcing analysis or for rapid BOM review when package and broad electrical class must stay constant.
However, cross-reference tables should be treated as a starting point rather than a final substitute decision. In RF work, equivalent case size and nominal capacitance do not automatically guarantee equivalent ESR, power handling, breakdown margin, or thermal drift under load.
Selection Checklist
A balanced technical benchmark becomes most useful when it is reduced to a shortlist workflow:
- Define the real thermal profile first, including hotspot temperature and expected self-heating under RF current.
- Check maximum DC and RF voltage with margin, not just nominal bus voltage.
- Identify whether the application requires non-magnetic construction, especially in MRI or other magnetically sensitive environments.
- Prioritize ESR and Q factor in filters, oscillators, and matching networks where loss directly affects efficiency or selectivity.
- Use capacitance range and fixed footprint limits to identify whether a family supports the needed value without forcing a layout change.
- For extreme-power designs, verify current data and breakdown behavior at the target frequency rather than relying only on a static voltage line item.
Following this sequence keeps the benchmark technically grounded and reduces the risk of turning a catalogue comparison into an oversimplified supplier preference exercise.
Summary
The benchmark shows that the compared High-Q RF MLCC families share important common ground in dielectric type and package logic, but diverge meaningfully in temperature capability, voltage range, capacitance coverage, and specialized options such as ultra-low ESR or non-magnetic construction.
In 0505, the decision is mostly about capacitance span, loss, and application focus; in 1111, thermal capability becomes decisive; in 0603 and 0805, voltage and precision behavior shape the shortlist; and in 4040, extreme voltage is only one part of a much more application-specific selection problem.
References
- Kyocera AVX RF / Microwave High-Q capacitor catalogues and series documentation, including 100A, 600S, 600F, 700B, and 700E families: KYOCERA AVX
- Johanson Technology RF capacitor and microwave passive product documentation, including R14S, R15S, and S42E families: Johanson Technology
- Knowles Precision Devices / DLI high-reliability RF capacitor documentation, including C-series families such as C11 and C40: Knowles Precision Devices
- Dalian Dalicap high-Q RF capacitor product information, including DLC70A, DLC70B, DLC70D, and DLC70E families: Dalicap
- Exxelia RF and microwave capacitor product information, including SHA, SHB, SHS, SHF, CLE, and related families: Exxelia
