Metric · Business & Market
Lead time
The elapsed time from placing an order to receiving parts, driven by wafer cycle time, assembly, test and die bank position. Quoted lead times are a live indicator of how tight capacity is.
- Also known as
- Quoted lead time, L/T
- Type
- Metric
- Domain
- Business & Market, Supply chain
Notes
Normal lead times are eight to sixteen weeks; the 2021 shortage pushed some mature-node parts past a year.
Overview
Lead time, in the chip supply chain, is the time from a customer placing an order to receiving the parts. It is driven mainly by the time needed to process wafers in the fab, then assemble, test and ship them, plus any wait for capacity, and it shrinks when finished dice or parts are already held in a die bank or inventory. Quoted lead times are closely watched because they rise quickly when capacity is tight and fall back when supply catches up.
How it works
For a part that must be built from scratch, the longest step is usually the fab. The Semiconductor Industry Association puts wafer cycle time at about 12 weeks on average and 14 to 20 weeks for advanced processes; assembly, test and packaging can add around six weeks; so a full order-to-delivery lead time can reach about 26 weeks. If the fab is full, the order also waits for capacity, and if a new production line or process step must be qualified, the wait can stretch much further.
Suppliers shorten lead times by holding stock at intermediate points. Wafers can be parked partway through processing, finished wafers or tested dice can sit in a die bank ready for assembly, and finished goods can be held by the supplier or by distributors. A part available from stock may be quoted in days, while the same part with no inventory reverts to its full manufacturing lead time.
Lead times interact with buying behaviour. When customers see quotes lengthen, many place extra or earlier orders to secure supply, which fills order books further and lengthens quotes again. When demand cools, those buffers are worked down and orders can fall sharply, so lead time data is read as a sign of where the cycle stands.
Examples
- A carmaker's purchasing team placing chip orders six months or more ahead because supplier lead times have stretched past 26 weeks.
- A microcontroller supplier shortening delivery to a few weeks by assembling parts from its die bank instead of starting new wafers.
- A customer reducing orders when lead times shorten after a shortage, leading to an inventory correction at the supplier.
Why it matters
Demand planners, supply chain managers, buyers, sales operations and distributors use lead times daily to plan orders, commit delivery dates and size inventory. During the 2021 and 2022 shortage, long lead times on microcontrollers and analogue chips halted vehicle production lines, showing how a component worth a few dollars can stop a product worth thousands.
In the chip lifecycle, lead time becomes important at production ramp and through volume production, shapes die bank and inventory strategy, and returns as a concern at end of life, when last-time buys must be ordered far enough ahead of the final wafer starts.
It matters most to: Demand Planner, Distribution Operations Manager, Sales and Operations Planning (S&OP) Manager, Supply Chain Risk and Resilience Manager, Supply-Demand Planning Manager
Common confusions
- Not the same as cycle time
- Cycle time is how long the fab, or another step, takes to process the material once started. Lead time is what the customer waits, which also includes queues for capacity, assembly, test and shipping, minus anything served from stock. Lead time vs cycle time
- Not the same as time to market
- Time to market is how long it takes to develop a new product and bring it to sale. Lead time applies to ordering an existing product.
Key figures
- Up to about 26 weeks Order-to-delivery lead time for a chip built from scratch: about 12 weeks of wafer cycle time on average (14 to 20 weeks for advanced processes) plus around 6 weeks of assembly, test and packaging, as described by the SIA in 2021. (Source: Chipmakers Are Ramping Up Production to Address Semiconductor Shortage. Here's Why that Takes Time, 2026-10-22)
- About 15 to about 30 weeks How microcontroller lead times roughly doubled during the 2021 and 2022 shortage; total lead time peaked around 26 weeks in early 2022. (Source: When the Chips Went Down: Motor Vehicle Production and the 2021-2022 Semiconductor Shortages (FEDS Notes, accessible data), 2026-10-22)
Sources
- Chipmakers Are Ramping Up Production to Address Semiconductor Shortage. Here's Why that Takes Time (opens in a new tab), Semiconductor Industry Association (SIA), 2026-10-22
- When the Chips Went Down: Motor Vehicle Production and the 2021-2022 Semiconductor Shortages (FEDS Notes, accessible data) (opens in a new tab), Board of Governors of the Federal Reserve System, 2026-10-22
- End In Sight For Chip Shortages? (Mark LaPedus, 18 November 2021) (opens in a new tab), Semiconductor Engineering, 2026-10-22
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