On December 2, 2025, Murata Manufacturing Co., Ltd. announced the development and mass production of the world's first 1210inch (3.2×2.5mm) multilayer ceramic capacitor with a 1.25kV rating and C0G temperature characteristics, offering 15nF capacitance. Designed specifically for on-board chargers (OBCs) and high-performance power circuits, this MLCC is optimized for SiC MOSFET-based high-voltage switching topologies.

This marks the first time Murata has combined 1.25kV high withstand voltage with C0G characteristics in a 1210 package. Previously, comparable high-voltage C0G products required larger packages such as 1812 or 2220. The 1210-size 15nF device significantly reduces PCB footprint, enabling more compact designs for high-power-density OBCs and DC-DC converters. The product line spans 4.7nF to 15nF with ±1% to ±5% tolerance and an operating temperature range of -55°C to +125°C.

In OBCs and high-voltage DC-DC converters, power switches are rapidly transitioning from traditional Si MOSFETs to SiC MOSFETs. SiC devices switch faster (dV/dt up to 100V/ns and beyond) with lower conduction losses, but they demand resonant and snubber capacitors capable of withstanding over 1.2kV voltage stress while maintaining stable capacitance and low ESR at elevated temperatures.

C0G (NP0) is the most stable MLCC dielectric available, with a temperature coefficient of only ±30ppm/°C — capacitance remains virtually constant across temperature and voltage variations. This is critical for resonant circuits: an LLC resonant converter's switching frequency depends on precise resonant capacitance, and any drift leads to efficiency loss and increased EMI. C0G's ultra-low loss characteristic (DF < 0.1%) provides significant advantages in high-frequency switching applications.

Murata achieved this breakthrough through proprietary ceramic body and internal electrode thinning technology, packing sufficient electrode layers into the 1210 package to reach 15nF while maintaining 1.25kV withstand voltage. This requires precise balance between dielectric layer thickness (determining voltage rating) and layer count (determining capacitance) — an exceptionally demanding manufacturing feat.

OBC Resonant Circuits: 6.6kW and 11kW OBCs typically employ LLC or CLLC resonant topologies. The resonant capacitor must withstand high peak voltages and currents in the resonant tank while maintaining precise capacitance to preserve the resonant frequency. The 1.25kV/15nF C0G MLCC can serve directly in the resonant tank, replacing traditional film capacitors with smaller size and higher reliability.

SiC Snubber Circuits: SiC MOSFET turn-off transients produce extremely high di/dt, with drain voltage spikes potentially exceeding 1kV. Snubber capacitors must simultaneously satisfy high voltage rating, low loss, and temperature stability. C0G MLCCs with ultra-low ESR and high dV/dt capability are ideal for RCD snubber applications.

High-Voltage DC-DC Converters: In 800V battery platform DC-DC modules, input-side filtering and resonant circuits require high-voltage capacitors. C0G characteristics ensure stable capacitance across the full -55°C to +125°C temperature range, preventing circuit parameter drift.

High-voltage C0G MLCCs are high-value, high-barrier products with a concentrated global supplier base. The 1.25kV 1210-size C0G device is currently exclusive to Murata, meaning early-stage supply will be constrained. Procurement teams working on OBC and high-voltage DC-DC projects should prioritize establishing communication channels with Murata or authorized distributors.

For alternatives, if 1210 size is not a hard requirement, consider TDK's C Series high-voltage C0G products (typically in 1812 or larger packages) or Samsung's CL series high-voltage models. However, there is currently no direct competitor to the 1.25kV C0G 15nF in 1210 package — alternative evaluation will require PCB layout redesign.

For small-to-medium volume OBC development projects, Movthing can assist with obtaining Murata high-voltage C0G MLCC samples and datasheets, along with cross-reference alternative evaluations. High-voltage capacitor lead times are typically 4–6 weeks longer than standard products, so plan procurement timelines accordingly.

C0G means this device delivers excellent stability across temperature, DC bias, and time. Unlike X7R/X5R, C0G capacitance experiences virtually no DC bias derating — engineers can design circuits using the nominal capacitance value without applying derating factors.