AI hardware stories often focus on GPUs, HBM, substrates, and advanced packaging. A June 22, 2026 TrendForce analysis adds a quieter component-family signal: the power-delivery discussion is moving deeper into the capacitor stack, where board-level MLCCs and package-level silicon capacitors answer different placement and power-integrity problems.
For buyers, that does not support a blanket passive-component shortage call. It does support a more specific RFQ discipline: capacitor placement notes should travel with the sourcing request. A capacitor that appears minor in the BOM can become hard to substitute if the design depends on voltage rating, capacitance, case size, ESL, die proximity, substrate integration, or a customer-approved construction.
What this means for PCX buyers
For PCX buyers, the practical question is not whether every MLCC or capacitor line is under pressure. The useful question is whether a current assembly depends on capacitor behavior that purchasing cannot infer from a short MPN list. Power-sensitive boards often carry hidden constraints: derating assumptions, approved manufacturer lists, placement restrictions, thermal expectations, acoustic sensitivity, or a module supplier’s qualification file.
That is where a sourcing note becomes useful. If the RFQ only says “capacitor” or lists one approved part without the surrounding requirements, an alternate quote may look plausible while still being unusable. If the RFQ carries the placement layer, electrical limits, and approval rules, the sourcing conversation becomes narrower and safer.
The placement question buyers should ask
TrendForce frames the issue as a dual-track evolution. Its analysis says AI-server capacitor demand has often been discussed through MLCCs, including high-capacitance and high-voltage needs, while silicon capacitors are becoming more relevant as power integrity moves from the board into the package. The same article emphasizes complementarity rather than substitution: MLCCs and silicon capacitors sit in different layers of the design problem.
That layer distinction is the sourcing point. A board-level MLCC, an embedded package capacitor, a land-side silicon capacitor, and a top-side component may all support power integrity, but the sourcing flexibility is not the same. Buyers should ask where the capacitor sits, who controls the qualification, and whether the approved source can be changed through normal purchasing action or only through engineering, customer, or module-supplier approval.
Board-level MLCCs: what has to travel with the RFQ
For board-level MLCC exposure, the RFQ should carry more than capacitance and voltage. Review dielectric, tolerance, case size, temperature behavior, DC-bias derating, ripple or transient assumptions where relevant, termination, qualification grade, approved manufacturer list, and any customer-specific restrictions. If the design uses high-capacitance or high-voltage MLCCs near processors, accelerators, power-management ICs, or networking silicon, ask engineering whether location and electrical behavior are flexible.
The safest sourcing file separates three categories. First are flexible MLCCs with qualified alternates. Second are parts with similar alternates that still need electrical or customer review. Third are design-sensitive components where a nominal match may fail because derating, package, placement, or supplier qualification differs. That sorting prevents a low-value line item from becoming a late build blocker.
Package-level silicon capacitors: why substitution is different
TrendForce also describes silicon capacitors as more closely aligned with semiconductor processes and advanced packaging. It notes co-design with AI GPU, ASIC, HBM, and packaging platforms, higher entry barriers, longer customer qualification cycles, and relatively limited supply scale. Those are not normal catalog-substitution conditions.
When a silicon capacitor is embedded in a package, tied to an interposer or substrate, or qualified with a module platform, procurement may have little direct substitution authority. The buyer action is still useful, but it changes: confirm whether the exposure is inside a purchased module, part of a custom package path, or visible as a board-level line. Then document who owns the qualification file and what evidence is needed before any alternate can be discussed.
What not to conclude from one source
This is a narrow buyer-watch note. It should not be read as evidence that all MLCCs are constrained, that silicon capacitors are broadly unavailable, that prices are moving in a specific direction, or that AI demand will affect every passive line. The inspected TrendForce article supports the design and supply-chain distinction; it does not give PCX a basis here for numeric forecasts or broad allocation claims.
The useful takeaway is disciplined sourcing data. If a capacitor is electrically ordinary and has qualified alternates, it may remain a normal passive line. If it is tied to high-current transient response, tight placement, advanced packaging, or a customer-approved supplier list, it belongs in the same risk review as the processor, memory, power-management ICs, connectors, thermal parts, and board stack-up.
How PCX can help keep the review specific
PCX can help buyers turn a power-integrity signal into an exact sourcing file. Start with the passive-components category when the exposed lines are MLCCs or related passives, and use the PCX parts request form when an exact-MPN review is needed. For constrained or substitution-sensitive sourcing, the PCX Star Quality Program is the better lens than a simple price check.
The buyer question is not whether to buy capacitors ahead of the market. It is whether the build file clearly shows which capacitor lines are flexible, which are placement-sensitive, and which need alternate-source documentation before demand pressure makes the decision more difficult.
Sources and further reading
Primary inspected source: TrendForce, “Powering Next-Gen AI: Capacitors’ Dual-Track Evolution”, published June 22, 2026. PCX used this as a narrow buyer-watch source only; unsupported numeric, pricing, broad capacity, and allocation claims were excluded.
