Sourcing semiconductors, from the buyer's side

1Contract fundamentals

Before any subsystem, the commercial rules of engagement. These four terms decide who carries the risk when a Tier-1 buys silicon.

• Take-or-pay — a volume commitment you pay for whether or not you use it. The risk: suppliers penalize shortfalls below a threshold (often ~80% of forecast), so a program cancellation or demand drop leaves you buying — and paying for — parts you can't use.
• Non-cancellable, non-returnable (NCNR) — a firm-order freeze window. The risk: once inside the window (commonly 90–180 days), the order can't be cancelled or reduced — you carry the liability before production even starts.
• Capacity reservation fees — upfront capital to secure future wafer or line capacity. The risk: money committed ahead of demand, on a foundry/IDM's terms, to guarantee you a place in the queue.
• Product change notices (PCN) & end-of-life (EOL) — the supplier's right to change or discontinue a part. The risk: obsolescence on a part designed into a 7–10 year vehicle, forcing a last-time-buy (LTB) and a costly re-qualification.

2Automotive-specific contract risks

The terms above apply on any chip contract — but automotive adds its own grammar. Parts are safety-critical, programs run 15+ years, and every part clears a months-long qualification cycle. That turns ordinary terms into multi-year locks and adds clauses a generic review misses.

• Qualification lock-in — AEC-Q100 / IATF 16949 / PPAP — A qualified part is a locked-in part: switching sources means re-running the reliability, site-quality, and part-approval gates — and a supplier's own fab move or process change can force that re-qualification on you (roughly 6–18 months). Who carries it: usually the buyer, by default. Negotiate: who pays for and schedules re-qualification on a supplier-initiated change — a clause barring unilateral process changes without re-qual at the supplier's cost is worth far more than it reads.
• The PCN notice gap — A Product Change Notice is the advance warning before a part changes or is discontinued. The trap: the PCN notice window in the contract is often shorter than the re-qualification the change forces — so you can get perfectly compliant notice and still be caught with no qualified part. Who carries it: the buyer, sitting in the gap. Negotiate: measure the two against each other; if notice is shorter than your device's re-qual time, that difference is your exposure — widen the window, or secure a bridge-supply obligation to cover it.
• Longevity, EOL & last-time-buy — Cars are built for years and serviced for a decade more; a chip's commercial life is shorter. The end-of-life and last-time-buy (LTB) terms decide whether you can supply the whole program and its service tail. Who carries it: the buyer left with an un-serviceable platform. Negotiate: a longevity commitment matched to program life, plus an LTB window long enough to bridge a redesign — and check the LTB quantity covers production and the service tail, not just the next model year.
• The OEM directed-buy squeeze — Since the 2021–22 shortage, carmakers increasingly go direct to chipmakers and direct the Tier-1 on whom to buy from (e.g. GM–Wolfspeed/Qualcomm, Ford–GlobalFoundries). The Tier-1 keeps the purchasing obligation and the risk but loses the leverage — bound to a source it didn't choose. Who carries it: the Tier-1, squeezed on both sides. Negotiate: separate OE-directed parts from what you control (your leverage lives in the non-directed parts); where a part is directed, flow the OEM's volume commitment back-to-back onto the supplier — so you're not carrying a take-or-pay to a source the OEM chose without the OEM standing behind the volume.

3Subsystem sourcing map

Buyers don't source "analog" or "memory" in the abstract — they source components into a subsystem. Each subsystem carries its own supplier concentration, contract behavior, and leverage. These are the highest-complexity, highest-leverage domains; commoditized parts (chassis switches, passives) are left out on purpose.

4Memory vs. analog — two different animals

The single most useful thing a buyer can internalize: memory and analog suppliers behave in opposite ways at the table, so the same contract term protects you differently in each.

5Glossary

A plain-English, commercial translation of the terminology chip suppliers use — with the contract implication, not just the definition.

AEC-Q100

The automotive stress-test qualification for integrated circuits, graded 0 (harshest environment) to 3. Why it matters: moving a design to a stricter grade adds price premium and lead-time risk, and re-grading is not free.

ASIL-D (ISO 26262)

The highest automotive functional-safety level, for systems like steering and braking. Why it matters: the diagnostic requirements are so specific that qualified parts are effectively single-source — which becomes the supplier's leverage in negotiation.

IATF 16949

The automotive quality-management standard a supplier's manufacturing site must run. Why it matters: it's a site-level gate — a supplier moving production to a non-certified site can trigger re-qualification.

PPAP

Production Part Approval Process — the sign-off that a specific part, from a specific line, is production-ready. Why it matters: it's part- and line-specific, so a fab or process change voids it and restarts the clock.

Re-qualification

Re-running the qualification gates after a change of source, fab, or process. Why it matters: it costs months and money, and the contract decides whether the supplier or you bears it when the change is supplier-initiated.

Take-or-pay

A commitment to buy (or pay for) a set volume regardless of actual demand. Why it matters: your downside on a cancelled or slowed vehicle program — negotiate carve-outs for it.

NCNR (non-cancellable, non-returnable)

A firm-order window inside which you can't cancel or return. Why it matters: it's raw liability you carry before production; the length of the window is the negotiation.

Capacity reservation

Paying up front to hold future fab/line capacity. Why it matters: in a shortage it's how you guarantee supply — but it's capital committed on the supplier's terms.

PCN / EOL

Product change notice and end-of-life. Why it matters: a supplier can change or discontinue a part on a vehicle you'll build for a decade — and the PCN notice window is often shorter than the re-qualification the change forces.

Last-time-buy (LTB)

The final order window before a part is discontinued. Why it matters: for a 15-year vehicle the LTB quantity must cover production and the service tail — not just the next model year — or you can't repair fielded cars.

Foundry vs. IDM

An IDM (TI, Infineon, ST) owns its own fabs; a fabless supplier depends on a third-party foundry (TSMC, GlobalFoundries). Why it matters: IDMs control their own pricing and capacity; fabless suppliers are exposed to their foundry's allocation, which becomes your exposure too.

Node migration

Shifting production to a smaller (newer) process node. Why it matters: when a supplier moves to a new node, older nodes get price hikes or EOL notices — pressuring buyers into expensive re-validation.

Wafer allocation

How a fab splits its output across product lines. Why it matters: in a shortage, higher-margin consumer/datacenter wafers get priority over automotive — so allocation is worth carving out explicitly in the contract.

Second-source / qualification

Having an alternative, qualified supplier for a part. Why it matters: it's the single biggest lever against lock-in — and it's easy for memory, hard for analog, which is exactly why analog suppliers hold more leverage.