The Components Everyone Forgot About
The semiconductor shortage of 2020 to 2022 focused the attention of the electronics industry, its customers, and the broader public on the complex and concentrated supply chain for integrated circuits — the microprocessors, memory chips, and power semiconductors whose shortage created production disruptions across the automotive, consumer electronics, and industrial equipment industries. What received substantially less attention in the same period, and what is receiving even less in the current period of equally significant supply chain stress, is the parallel tightening in the market for passive electronic components — the multilayer ceramic capacitors, chip resistors, inductors, and the tantalum and aluminium electrolytic capacitors that every electronic circuit board requires in quantities that typically dwarf the integrated circuit count by factors of ten or more. A modern smartphone contains over 1,000 passive components. An electric vehicle contains passive components whose total count ranges from 10,000 to 15,000 across the power electronics, battery management, motor control, and chassis electronics systems. An AI server rack contains passive components whose quantity and specification reflect the extraordinary electrical demands of high-power GPU cluster operation. These components are unglamorous, individually inexpensive, and categorically essential — which is precisely why the market disruption in passive electronic components, when it arrives, creates production problems that are as acute and as commercially consequential as semiconductor shortages despite attracting a fraction of the commentary.
The current market dynamics in passive electronic components — whose lead times for specific high-specification multilayer ceramic capacitors, automotive-grade resistors, and the high-frequency inductors that power electronics and communications applications require have extended substantially from the normalised post-shortage levels of 2023 and 2024 — are being driven by the simultaneous acceleration of electric vehicle production, the AI data centre infrastructure buildout, and the industrial automation investment that the robotics and smart manufacturing market growth represents. Each of these demand drivers is individually significant; their simultaneous acceleration is creating aggregate demand growth for specific passive component categories whose supply capacity expansion, constrained by the capital intensity and long lead time of ceramic capacitor and resistor manufacturing capacity addition, cannot respond at the pace that demand growth requires in the near term.
MLCC: The Ceramic Capacitor at the Centre of Everything
The multilayer ceramic capacitor — a layered sandwich of ceramic dielectric and metal electrode films whose miniaturisation and electrical performance have made it the dominant capacitor technology in virtually every electronics application — is the passive component most significantly affected by the current demand acceleration and the one whose supply dynamics are most consequential for the electronics manufacturing industries that depend on it. MLCC production is dominated by a small number of Japanese manufacturers — Murata Manufacturing, TDK, Taiyo Yuden, and Kyocera — and Korean manufacturers including Samsung Electro-Mechanics whose combined market share reflects the decades of materials science, process engineering, and manufacturing scale investment that MLCC production leadership requires. The concentration of MLCC supply in Japan and South Korea — whose manufacturing infrastructure, materials expertise, and quality management systems have proven difficult for Chinese and Taiwanese competitors to replicate at the highest performance tiers — creates the supply chain geography whose concentration is attracting the same strategic attention from electronics industry customers and government supply chain policy as the semiconductor supply chain concentration that preceded it.
The electric vehicle market's MLCC demand is growing substantially faster than the EV unit production rate because the MLCC content per vehicle is itself increasing as the sophistication of vehicle electronics expands. The advanced driver assistance systems, the vehicle-to-everything communication hardware, the high-voltage power conversion electronics of the drivetrain, and the thermal management electronics of battery and motor systems all require MLCCs whose automotive-grade qualification — whose temperature range, vibration tolerance, and lifetime reliability specifications substantially exceed those of consumer electronics MLCCs — limits the number of qualified supply sources and creates the premium pricing and extended lead time that automotive procurement managers are navigating in the current market. The AI server and GPU infrastructure demand for MLCCs — concentrated in the large-value, high-capacitance components that power delivery network design for high-power GPU clusters requires — is adding a data centre demand dimension to the MLCC market that did not exist at commercial scale five years ago and whose growth is directly proportional to the AI infrastructure investment acceleration that the technology industry is sustaining.
Resistors and Inductors: The Supporting Cast With Its Own Story
The chip resistor market — providing the thin-film and thick-film resistors that set reference voltages, limit current, and perform the signal conditioning functions that every analogue circuit requires — is experiencing demand growth whose character differs from the MLCC market in its geographic production distribution and its application sensitivity profile. The automotive and industrial resistor market — whose high-precision, high-stability resistor requirements reflect the performance and reliability demands of automotive electronics and industrial measurement applications — is the highest-value segment of the resistor market and the one whose supply tightness is most commercially consequential for the equipment manufacturers whose product performance depends on the tight tolerance and long-term stability that high-precision resistors provide. The power resistor market — whose high-power dissipation capability serves the energy conversion, motor control, and power quality applications of industrial and renewable energy electronics — is growing with the industrial automation and renewable energy infrastructure investment that the energy transition and manufacturing reshoring are creating.
The inductor and transformer market — providing the magnetic components that store energy in switching power supplies, filter harmonics in power electronics, and tune resonant circuits in communications hardware — is the passive component category whose supply constraint is most directly related to the power electronics content of electric vehicles and renewable energy systems. The high-current, high-frequency inductors required for the DC-DC converters of EV battery management systems, the motor drive inverters, and the onboard chargers represent a technically demanding product category whose magnetic core material, winding geometry, and thermal management design create the engineering complexity that limits the number of qualified suppliers and creates the lead time extension that EV manufacturers are managing as part of the broader supply chain complexity of high-volume EV production ramp.
Supply Chain Strategy and the Long-Term Structural Question
The electronics industry's response to passive component supply tightness — whose cyclical character has historically been managed through inventory buffer building, multi-sourcing, and the toleration of lead time extension without structural supply chain reform — is beginning to incorporate the longer-term supply chain resilience thinking that the semiconductor shortage experience and the geopolitical reassessment of electronics supply chain concentration have made commercially and strategically necessary. The major electronics manufacturing services companies and the OEMs whose component procurement determines the availability of the passive components that their supply chains require are investing in the supply chain visibility, long-term capacity reservation agreements, and the qualified supplier development programmes that reduce their exposure to the spot market price spikes and lead time extensions that passive component shortages create. The government industrial policy dimension of passive component supply chain resilience — less developed than the semiconductor supply chain policy that CHIPS Act-equivalent programmes address in multiple jurisdictions — is beginning to receive attention from the electronics industry advocacy organisations whose policy engagement on passive component supply chain risk is making the case for the investment incentives and supply chain audit requirements that would support passive component supply diversification outside the current geographic concentration in East Asia.