Power Discretes at 40 to 52 Weeks: A 2027 Allocation Playbook

The channel survey published by Deutsche Bank on 20 October, built on weekly distributor price scraping across more than 1,500 SKUs together with dbDataInsights, says the mature-node shortage has stopped being a memory story. Power discretes are quoted at 40 to 52 weeks. Some Texas Instruments and Analog Devices parts are quoted at 60 to 70 weeks. ON Semiconductor has raised prices across its range by 10 to 20 percent, effective 10 October. Thirty-two-bit MCU families, STM32 among them, are receiving allocation notices, with Infineon and Renesas in the same position.

None of those numbers is a surprise on its own. What makes this month different is that they arrived together, in the same survey, after two earlier rounds of price increases from Infineon and ST, and while industry estimates put 2026 global effective 8-inch capacity down 2.4 percent year on year. A 40-week lead time on a MOSFET used to be an event. It is now the base case, and the planning question has changed from how fast can we get parts to what do we build with the parts we can get.

Start with the second source, not the price

The cheapest response to a 52-week lead time is a cross-reference. For power discretes the practical hierarchy is package, then voltage class, then Rds(on) and gate charge, then thermal path. A D2PAK and a TO-220 are not interchangeable in a reflow line even if the die is identical; a PowerPAK 8x8 and a DFN 5x6 usually are, if the footprint and the thermal pad match. Buyers who ask for an alternate should state the package, the Vds margin, the Rds(on) ceiling at the actual gate drive voltage, and whether avalanche rating matters. Suppliers who answer with a part number and no comparison table are guessing.

Gate drive is where cross-references quietly fail. A device with half the gate charge will switch faster and ring harder; a device with a higher threshold voltage may not turn on reliably from a 3.3 volt driver. On synchronous buck stages the body diode reverse recovery of the low-side device sets the dead time, and a substitution that ignores it turns a working board into an EMC problem. If the design has a gate driver with fixed dead time and no adaptive control, qualify the alternate on the bench before you qualify it in the BOM.

Price increases that arrive as PCNs

A 10 to 20 percent range increase is rarely applied uniformly across a catalogue. It lands first on the lines where capacity is tightest, and it arrives to the buyer as a price notification or, more often, as a product change notification with a new suffix and an unchanged datasheet. Procurement teams that only track part numbers miss it. The ones that track the manufacturer part number plus the packaging suffix plus the date code see it in the first shipment.

Two practical rules. First, put a quote validity window in writing: 30 days on allocated families, not 90. Second, ask for the price basis — is the figure ex-works, does it include the tariff exposure, and which incoterm. On a part whose price moves 15 percent in a quarter, a DDP quote with a 90-day validity is an unpriced option that the supplier is granting you for free, and it will not survive the next round.

Forecast further out than feels reasonable

The advice circulating in the German industrial supply chain this month, from EMS providers serving automotive and machinery customers, is to give suppliers 12 to 18 month demand forecasts and to pre-buy next year's requirement on the critical lines. That is more horizon than most small and mid-size buyers are used to providing, and it only works if the forecast is honest about mix rather than only about volume. A forecast that says 50,000 MOSFETs without saying which four part numbers is not usable for allocation.

The other half of the same advice is knowing which lines are actually critical. Most boards have three or four parts that cannot be substituted inside a quarter, and thirty that can. Ranking the BOM by substitution difficulty, rather than by spend, tells you where to spend the negotiating effort and where to accept the market price.

What this does to a 2027 build plan

If a power stage is quoted at 40 to 52 weeks today, an order placed in October lands between August and October 2027. That is the whole planning calendar. Either the design is frozen now and the long-lead lines are booked against it, or the build moves. There is no third option where the schedule holds and the parts arrive later, because a board cannot be assembled around a missing MOSFET.

We source and quote these families daily, and the useful thing we can do is tell you which lines are real. Our component catalogue carries the power devices, drivers, MCUs and passives that sit on these designs, and our PCBA service reviews substitution risk before we commit to a build rather than after a line stops. For the wider price picture this quarter, our notes on October price rounds and on analog and MCU lead times cover the rest of the board.

Send a BOM with quantities and target build dates through the inquiry form and we will return it marked line by line: buyable now, buyable with an alternate, or long. That is a more useful document than a lead time average.