Renesas Electronics has raised its internal inventory target from 120 to 150 days and issued its second price increase of the year, effective January 1, 2027. The moves reflect a strategic shift from lean inventory management to redundant stockpiling as demand exceeds available capacity and raw material procurement tightens.
The company says orders are mixing genuine demand with panic‑driven over‑ordering, making it difficult to distinguish real signals. By holding more inventory itself, Renesas aims to filter out false demand – a contrast to the 2021 chip shortage when distributors and OEMs double‑booked. Strong AI power revenue gives Renesas, Infineon, and onsemi the confidence to carry higher stock levels, with customers willing to prepay and share risk.
Industry‑wide price hikes in 2026:
Infineon: two rounds – power switches +5‑15% (April), power modules +10‑25% (July)
Texas Instruments: fourth increase in a year (July)
STMicroelectronics: April, June, and late‑August adjustments
Chinese vendors: CR Micro, Silan, Yangjie, StarPower – 10‑15%+ increases since July
Taiwanese vendors: Panjit, Taiwan Semi, Eris – planning another 10‑15% in October
Nearly 20 power semiconductor firms have announced price hikes this year.
Supply‑side constraints: 8‑inch mature node capacity is shrinking – TrendForce expects a 2.4% YoY decline in 2026 effective capacity as TSMC and Samsung shift 8‑inch lines to advanced nodes and packaging. AI high‑voltage devices are also crowding out power chip capacity. Lead times have stretched from 8‑12 weeks to 30+ weeks for standard MOSFETs/rectifiers, and 40‑52 weeks for automotive IGBTs, AI server high‑voltage modules, and SiC devices. Average power semiconductor prices rose 15‑20% in H1 2026.
Raw material costs add pressure: G5 electronic‑grade hydrofluoric acid jumped 75% (RMB 120K→210K/ton) in six months; copper rose from RMB 92K to 105K/ton; SiC substrates are up >50% YoY.
Historical context: The 2020‑22 shortage saw inventories peak above 200 days, followed by a two‑year downturn with 30%+ price declines. Renesas itself suffered from the 2021 N3 fab fire and a $2B Wolfspeed prepayment that later led to asset losses. These lessons pushed the company toward controlled redundancy rather than letting customers panic‑order.
AI power demand is the key growth engine. AI rack power is rising from 120kW to 600kW‑1MW, with 800V HVDC architecture replacing 48V/54V. SiC is suited for room‑level AC/DC conversion, GaN for in‑rack DC/DC. TrendForce forecasts 2.75 million AI servers shipped in 2026 (+28%). Infineon’s power & sensor revenue hit €1.44B in Q3 (+34%), with AI data center revenue expected to double to >€1.6B for the fiscal year; it plans €2.7B capex for data center power capacity and has signed multi‑year reservation agreements worth €7‑9B. onsemi’s AI data center business is also expected to double in 2026.
Market outlook: BofA sees AI rack power reaching 100x traditional racks by 2030; McKinsey projects ~$7T in global data center investment by 2030. AI data center power semiconductor market could grow from **$12B to $50B**. Yole forecasts the overall power device market at **$41.3B by 2031** (7.1% CAGR), with AI data centers the strongest growth variable.
The new cycle dynamic: Renesas raising its inventory target to 150 days effectively lifts the industry's inventory baseline during an upcycle. If end demand holds, high lead times and elevated inventory will stabilize supply through H2 2027. CR Micro reports order visibility up to 9 months and record backlog. But redundant inventory carries risk – if demand turns, high stock levels will prolong production cuts and amplify price declines. The competitive focus in power semiconductors is shifting from pure capacity to balance sheet strength and supply chain risk management.
ICgoodFind Takeaway:
Renesas' inventory hike and broad price increases confirm power semiconductors are in a structural upcycle driven by AI and automotive demand. With lead times stretching beyond 40 weeks, buyers should plan procurement well ahead and track vendor inventory targets, pricing actions, and capacity reservation deals.
