TrendForce forecasts tighter high-capacitance MLCC supply

TrendForce expects supplies of high-capacitance multilayer ceramic capacitors to tighten as AI-server manufacturers increase demand for components used alongside processors and DDR5 memory. Its MLCC Market Bulletin, published on 19 October, forecasts that shortages affecting high-end products could become most severe during the first half of 2027, despite softer conditions across parts of the consumer electronics market.

The research identifies a divergence between demand for specialised capacitors and the broader electronics components market. Economic pressure is constraining some consumer device purchasing, while investment in AI computing infrastructure is increasing requirements for components used in demanding processor and memory power systems.

TrendForce says the growth in AI-server demand is extending beyond graphics processors to include server CPUs and DDR5 memory. These devices require carefully controlled electrical supplies, with capacitor selection contributing to the behaviour of the power distribution network connecting voltage regulators, printed circuit boards and semiconductor packages.

A multilayer ceramic capacitor stores electrical energy between alternating conductive electrodes separated by ceramic dielectric material. The layers are stacked within a compact component, allowing capacitance to be increased without requiring a large external package. The electrical characteristics depend on the dielectric composition, electrode geometry, layer thickness and the number of active layers.

Processors present demanding electrical loads because their current requirements can change rapidly as computing activity varies. When the load changes, the power distribution network must maintain the supply voltage within an acceptable range. A voltage regulator responds through its control system, while capacitors distributed across the board and package help provide local energy storage and reduce the resulting voltage disturbances.

The behaviour of a capacitor in this network depends on more than its nominal capacitance. Equivalent series resistance and inductance influence its impedance across different frequencies, while the physical location of the component affects the electrical path between the capacitor and the semiconductor device. A high nominal capacitance value does not necessarily provide the lowest impedance at every relevant frequency.

Dielectric behaviour introduces further constraints. Some high-permittivity ceramic materials exhibit substantial reductions in effective capacitance when a DC voltage is applied. The component’s temperature characteristics, ageing behaviour and voltage rating can also affect the capacitance available during operation. Designers consequently have to examine the electrical conditions of the actual circuit rather than relying solely on a catalogue value.

DDR5 systems create additional requirements for local power regulation and decoupling. The memory architecture incorporates power management arrangements that differ from earlier generations, and higher data rates place demands on electrical supply stability and signal integrity. The resulting component requirements depend on the memory module design, associated power circuitry and operating conditions.

High-capacitance MLCCs can be positioned close to devices and regulator outputs to help maintain supply stability. However, their suitability depends on the combined impedance of the power network. Several capacitor values and package configurations may be needed to address disturbances occurring over different frequency ranges, while board routing and the inductance of interconnections can limit the benefit of additional capacitance.

Manufacturing MLCCs involves forming thin ceramic dielectric layers, applying conductive electrode patterns, stacking and laminating the structure, and firing it under controlled conditions. External terminations are subsequently applied, followed by inspection and electrical testing. Increasing capacitance within a fixed package can require thinner dielectric layers or more active layers, making process precision and material consistency important.

Very thin dielectric structures increase the importance of controlling defects, contamination and dimensional variation. Imperfections can affect insulation resistance, electrical breakdown and long-term reliability. A manufacturing line producing general-purpose capacitors may therefore require changes to materials, equipment settings, process controls or testing before it can supply more demanding high-capacitance products at acceptable yields.

These differences limit the extent to which capacity can be transferred immediately between capacitor categories. Factory output that appears sufficient for standard products does not necessarily provide an available substitute for parts specified in high-performance computing equipment, particularly where customers require defined electrical behaviour, reliability evidence and consistent production quality.

TrendForce also identifies inventory accumulation among memory manufacturers as a factor influencing the near-term market. Purchasing ahead of actual component consumption can increase reported demand and reduce material available to other customers. Such activity may reflect expectations of future supply constraints, but orders and inventory movements are not equivalent to final installation volumes.

The research further notes the effect of production interruptions associated with holiday periods in China. Temporary restrictions on manufacturing activity can affect delivery schedules, although the scale of disruption depends on the suppliers and components concerned. These short-term factors operate alongside the longer-term increase in demand associated with server and memory applications.

Component substitution is one possible response to tighter availability, but it creates its own engineering requirements. Capacitors with identical case sizes, nominal capacitance and voltage ratings can differ in dielectric characteristics, impedance, mechanical reliability and effective capacitance under bias. Replacing an existing part may change the electrical behaviour of a regulator or processor supply network.

Manufacturers qualifying alternative suppliers may have to repeat electrical measurements, examine transient responses and establish whether the replacement behaves acceptably across the specified operating range. Applications requiring particularly stringent reliability or traceability can impose additional approval procedures before a new component is added to the production bill of materials.

TrendForce’s publicly accessible October bulletin also discusses possible changes in supplier relationships, but does not establish that proposed cooperation has already produced additional qualified manufacturing capacity. The availability of new high-end output will depend on manufacturing investment, the suitability of production processes and customers’ acceptance of the resulting components.

The public summary does not establish a precise worldwide shortage volume, a universal lead-time increase or a percentage price rise for individual high-capacitance MLCC specifications. Such figures cannot be derived reliably from the general forecast of tighter high-end supply, and conditions may differ substantially between component types.

TrendForce expects the most severe pressure to occur during the first half of 2027. Changes in manufacturer inventories, confirmed orders, delivery lead times and qualified production capacity will provide further evidence of whether supply is responding to demand from processors and memory systems, or whether the imbalance is extending beyond the period identified in the current forecast.