The KEMET CKC21C682GJGAC7800 is a high-voltage ceramic capacitor from the KC Link Comm C0G series, designed for applications requiring stable performance across wide temperature ranges and elevated voltage conditions. With a capacitance of 6800 pF and a tight ±2% tolerance, this component delivers precision in circuits where capacitance accuracy directly impacts filtering, decoupling, and timing functions. The 1700V DC voltage rating positions this capacitor for use in power conversion stages, isolated gate drivers, high-voltage pulse circuits, and energy storage networks where breakdown voltage margins must be maintained under continuous operation.
Built on C0G (NP0) dielectric technology, the CKC21C682GJGAC7800 exhibits near-zero capacitance drift over temperature, typically staying within ±30 ppm/°C across its -55°C to 150°C operating range. This temperature coefficient makes it suitable for resonant circuits, precision oscillators, and RF coupling stages where frequency stability and low loss tangent are non-negotiable. The C0G characteristic also ensures minimal aging effects, so capacitance remains predictable throughout the product lifecycle without the voltage- or time-dependent drift seen in higher-permittivity dielectrics.
The 2220 surface-mount package (5.70mm × 5.00mm footprint, 2.70mm maximum thickness) provides a compact form factor for high-voltage MLCC integration on densely populated boards. Low equivalent series inductance (ESL) is engineered into the KC Link series through optimized internal electrode geometry, reducing parasitic ringing in fast-switching applications such as GaN or SiC MOSFET gate drives, EMI filters, and snubber networks. High-temperature capability up to 150°C extends usable lifetime in automotive under-hood electronics, industrial inverters, and downhole instrumentation where ambient temperatures challenge standard 125°C-rated components.
Surface-mount construction simplifies automated assembly while the MLCC structure offers inherent robustness against mechanical shock and vibration. The combination of high voltage, low ESL, and extended temperature rating addresses design challenges in DC-DC converters operating above 400V input, three-phase motor drives, photovoltaic inverters, and telecom power supplies. The component is RoHS3 compliant and carries Moisture Sensitivity Level 1, eliminating floor-life constraints and simplifying moisture-sensitive device handling procedures in production environments.
General-purpose classification reflects versatility across power electronics, but the CKC21C682GJGAC7800 excels where high voltage and thermal stability converge: input and output filtering in isolated DC-DC topologies, bootstrap capacitors for high-side gate drives, and AC line coupling in power-factor correction stages. The 6800 pF value bridges the gap between smaller coupling capacitors and bulk energy storage, offering measurable impedance reduction at switching frequencies from tens of kilohertz into the low-megahertz range while withstanding transient overvoltage events inherent in inductive switching.
CKC21C682GJGAC7800 (1)
Replacement Planning for KEMET CKC21C682GJGAC7800 High-Voltage C0G MLCC
Replacing KEMET CKC21C682GJGAC7800 is not just a matter of matching 6800 pF capacitance. This part is a KC-LINK C0G/NP0 ceramic capacitor designed for high-voltage, high-temperature, low-ESL applications in a 2220 surface-mount package. A suitable equivalent must be reviewed for voltage rating, dielectric stability, package size, termination style, capacitance tolerance, temperature capability, and availability in production packaging.
Commonly considered replacement or alternative part numbers include:
- KEMET CKC21C682GJGAC7800
- KEMET C2220C682GKGACTU
- TDK C5750C0G3D682G230KA
- Murata GRM55C0G3D682GZ01L
- Samsung CL57C682GC3DNNNC
- Vishay VJ2220A682GXGAT5Z
The closest replacement path is normally another 2220-size C0G/NP0 MLCC with 6.8 nF capacitance and a voltage rating equal to or higher than 1.7 kVDC. Lower-voltage alternatives may be suitable only when the circuit voltage, transient margin, and derating rules are revalidated.
What KEMET CKC21C682GJGAC7800 Defines in the Original Circuit
KEMET CKC21C682GJGAC7800 is a 6800 pF, ±2%, 1700 VDC ceramic capacitor from the KEMET KC-LINK C0G series. It uses a C0G/NP0 dielectric, which provides low capacitance change over temperature, voltage, and time compared with high-K dielectrics such as X7R or X7S. This behavior directly affects replacement selection because a nominal 6.8 nF X7R capacitor may lose substantial capacitance under DC bias and may not behave the same in resonant, snubber, timing, or high-frequency energy-transfer circuits.
Key characteristics influencing replacement decisions include:
| Parameter | KEMET CKC21C682GJGAC7800 |
|---|---|
| Manufacturer | KEMET |
| Series | KC-LINK Comm C0G |
| Capacitance | 6800 pF / 6.8 nF |
| Tolerance | ±2% |
| Rated Voltage | 1700 VDC |
| Dielectric | C0G / NP0 |
| Operating Temperature | -55°C to +150°C |
| Package | 2220 / 5750 metric |
| Dimensions | 5.70 mm x 5.00 mm |
| Maximum Thickness | 2.70 mm |
| Mounting Type | Surface mount MLCC |
| Features | Low ESL, high voltage, high temperature |
| Packaging | Tape & Reel |
| Compliance | RoHS3, REACH unaffected, MSL 1 |
The 2220 package is part of the electrical design, not only the PCB footprint. Larger MLCC packages typically provide higher voltage capability and lower equivalent series inductance than smaller packages, but they may also be more sensitive to board flex and solder-joint stress. When replacing CKC21C682GJGAC7800, the mechanical footprint, pad geometry, solder process, and board strain environment should be checked along with the capacitance and voltage rating.
Typical applications include high-voltage DC-link networks, resonant power stages, snubber circuits, wide-bandgap semiconductor support circuits, high-frequency filtering, and general high-voltage ceramic capacitor use. In these applications, C0G stability, low loss, and temperature range are often more relevant than simply achieving the same nominal capacitance.
Candidate Equivalent and Alternative Parts for KEMET CKC21C682GJGAC7800
The following table compares practical candidate replacements. Exact suitability depends on the operating voltage, derating policy, pulse stress, ripple current, temperature rise, PCB layout, and procurement constraints.
| Manufacturer | Part Number | Key Specifications | Product Features | Typical Applications | Why It Can Replace the Original Part | Main Differences or Limitations | Recommended Usage |
|---|---|---|---|---|---|---|---|
| KEMET | CKC21C682GJGAC7800 | 6.8 nF, ±2%, 1700 VDC, C0G/NP0, 2220, -55°C to +150°C | KC-LINK, low ESL, high voltage, high temperature | DC-link support, snubber, resonant power, high-frequency filtering | Original reference part with matching electrical and mechanical design intent | Availability may vary by distributor inventory and reel quantity | First choice for direct replacement when available |
| KEMET | C2220C682GKGACTU | 6.8 nF, C0G, 2220, high-voltage rating depending on exact datasheet revision | Commercial high-voltage MLCC, stable dielectric, surface mount | High-voltage filtering, coupling, snubber, general-purpose HV ceramic use | Same capacitance class, same 2220 footprint, same C0G dielectric family | May not provide the same KC-LINK low-ESL construction or +150°C rating; voltage and tolerance must be confirmed | Suitable when the design does not depend on KC-LINK-specific high-frequency or thermal behavior |
| TDK | C5750C0G3D682G230KA | 6.8 nF, ±2%, C0G, 2220 / 5750 metric, high-voltage class | Stable C0G dielectric, high-voltage MLCC construction | Power conversion, resonant circuits, high-voltage filtering | Closely matches capacitance, tolerance, dielectric type, and mechanical package | Voltage code, thickness, termination, and qualified temperature range must be checked against the original design | Strong candidate for electrical cross-reference when equal or higher voltage rating is verified |
| Murata | GRM55C0G3D682GZ01L | 6.8 nF, ±2%, C0G, 2220 class, high-voltage MLCC | Low-loss dielectric, established MLCC process, tape-and-reel availability | High-voltage signal conditioning, filtering, power electronics support | Similar capacitance, tolerance, dielectric stability, and package size | Confirm DC voltage rating, thickness, and solder land compatibility before approval | Suitable for designs prioritizing stable capacitance and broad supplier availability |
| Samsung | CL57C682GC3DNNNC | 6.8 nF, ±2%, C0G, 2220 class, high-voltage MLCC | C0G dielectric, compact SMD high-voltage capacitor | Filtering, timing stability, high-voltage decoupling where derating is acceptable | Same nominal capacitance and dielectric family in a comparable package | Temperature rating and voltage margin may differ from KEMET KC-LINK; high-frequency loss should be reviewed | Candidate for cost or sourcing flexibility after electrical stress validation |
| Vishay | VJ2220A682GXGAT5Z | 6.8 nF, ±2%, C0G/NP0, 2220 package, high-voltage MLCC family | Stable dielectric, established VJ series format, tape-and-reel packaging | General high-voltage filtering, coupling, and bypassing | Same capacitance, tolerance, dielectric type, and 2220 footprint | Must not be used as a 1.7 kV substitute unless its rated voltage and derating margin meet the circuit requirement | Suitable only after voltage rating and surge conditions are confirmed |
For a true KEMET CKC21C682GJGAC7800 equivalent, the replacement should preserve four main attributes: 6.8 nF capacitance, ±2% tolerance, C0G/NP0 dielectric, and a working voltage rating that supports the original 1.7 kVDC requirement with the same or better derating margin. Parts that match capacitance but use X7R, X7S, or lower-voltage ratings should be treated as functional alternatives only after circuit-level validation.
Engineering Comparison of KEMET CKC21C682GJGAC7800 Replacement Options
Replacement selection should be based on the role of the capacitor in the circuit. In a resonant or snubber network, dielectric loss, ESL, and voltage behavior can affect switching waveform, temperature rise, and EMI. In a filter or coupling position, capacitance stability and insulation performance may dominate. The table below focuses on engineering trade-offs rather than simple part-number matching.
| Evaluation Factor | KEMET CKC21C682GJGAC7800 | KEMET C2220C682GKGACTU | TDK C5750C0G3D682G230KA | Murata GRM55C0G3D682GZ01L | Samsung CL57C682GC3DNNNC | Vishay VJ2220A682GXGAT5Z |
|---|---|---|---|---|---|---|
| Electrical Compatibility | Baseline: 6.8 nF, ±2%, 1700 VDC, C0G | Likely compatible if voltage and tolerance match design limits | Strong candidate if rated voltage equals or exceeds original | Strong candidate after voltage confirmation | Possible candidate if voltage and temperature limits match | Conditional; verify voltage rating before use |
| Mechanical Compatibility | 2220 / 5750 metric reference footprint | Same 2220 class, check thickness | Same 5750 metric class, check height and solder fillet | Comparable 2220 class, confirm pad fit | Comparable 2220 class | Same 2220 class |
| Performance Difference | Low ESL KC-LINK construction suited to fast switching | May have higher ESL or different AC current behavior | Usually strong for stable high-voltage C0G use | Stable capacitance, supplier-specific loss profile | Good for general C0G replacement where stress is moderate | Suitable for stable dielectric needs if voltage margin is adequate |
| Temperature Capability | -55°C to +150°C | Confirm datasheet; may differ from KC-LINK | Confirm maximum operating temperature | Confirm maximum operating temperature | Confirm maximum operating temperature | Confirm maximum operating temperature |
| Reliability Considerations | Original validated design reference | Needs review for flex sensitivity and voltage stress | Review pulse, ripple, and board strain conditions | Review termination and mounting stress | Review derating and application temperature | Review voltage derating carefully |
| Package Availability | Tape & Reel, original stock may vary | Often available through KEMET distribution | Broad MLCC supplier availability | Broad MLCC supplier availability | May offer sourcing or cost flexibility | Available in established Vishay MLCC channels |
| Cost Considerations | May carry premium due to KC-LINK performance | Potentially lower cost than KC-LINK depending on market | Moderate to premium depending on voltage rating | Moderate to premium | Often cost-competitive | Often cost-competitive |
| Best-Fit Scenario | Direct replacement, no redesign preferred | High-voltage C0G replacement when KC-LINK behavior is not required | Closest alternate path for stable high-voltage C0G design | Good second-source option after datasheet confirmation | Useful where cost and availability are balanced with validated margins | Use only when confirmed voltage rating satisfies the circuit |
| Main Limitation | Availability and exact reel sourcing | Not always equivalent in ESL, temperature, or pulse behavior | Requires datasheet-level voltage and thickness check | Exact ordering code must be verified | May require extra validation for high-temperature or high-voltage stress | Lower-rated versions are not safe substitutes for 1.7 kV circuits |
For the most conservative replacement strategy, select KEMET CKC21C682GJGAC7800 first, then evaluate TDK C5750C0G3D682G230KA or Murata GRM55C0G3D682GZ01L as second-source options if their voltage rating, dimensions, and temperature range match the design envelope. KEMET C2220C682GKGACTU can be considered where KC-LINK-specific low-ESL behavior is not a design dependency. Samsung CL57C682GC3DNNNC and Vishay VJ2220A682GXGAT5Z may be useful alternatives for sourcing flexibility, but they require careful voltage and application review before substitution.
For quotations and availability checks on KEMET CKC21C682GJGAC7800 replacement parts, use the professional electronic components website IC-Components.com or email Info@IC-Components.com.
