Skyworks Si5365–Si5369 Last-Time-Buy Date Arrives as Clock Migration Moves Into Execution
Skyworks set November 1, 2026 as the last-order acceptance date for 23 Si5365–Si5369 clock-device orderable items and evaluation boards. The notice identifies the end of KYEC final-tester support and declining demand as the reasons for discontinuation, while naming Si5392, Si5394 and Si5395 as alternate directions. Final shipments are scheduled for May 1, 2027, subject to the commercial conditions in the original notice.
A Defined Last-Time-Buy Milestone
Skyworks issued its product-discontinuation notice on May 1, 2026 and set November 1, 2026 as the date for last-order acceptance. The notice states that factory orders will not be accepted after that date. It also sets May 1, 2027 as the final Skyworks shipment date. The two milestones mark different stages: the first closes the factory-order window, while the second defines the planned end of shipments against accepted orders.
The affected scope is precise. The notice lists 23 orderable items and evaluation boards across the Si5365, Si5366, Si5367, Si5368 and Si5369 clock-device families. The list includes specific GQ and GQR package suffixes, lettered Si5368 and Si5369 variants, and several evaluation-board entries. This is not an announcement covering every Skyworks timing product or every member of the broader Si53xx portfolio.
Discontinuation Drivers and Their Limits
Skyworks attributes the discontinuation to two factors: final-tester support at KYEC is ending at the close of 2026, and demand for the listed products has declined. The notice describes a portfolio exit supported by a limited last-time-buy period. It does not state that current inventory has been exhausted, that every affected product is already unavailable, or that the wider clock-device market is in shortage.
That distinction matters for supply-chain interpretation. A tester-support deadline can impose a hard manufacturing boundary even when residual inventory or accepted production orders remain. Declining demand also explains the portfolio decision without establishing any market-wide pricing or lead-time conclusion. The operational signal is product lifecycle closure at defined order and shipment dates, not a generalized supply disruption.
Commercial Conditions on Accepted Orders
The last-time-buy terms narrow the remaining commercial path. Skyworks states that new orders are subject to a minimum purchase quantity of one reel unless the request can be filled from existing inventory. New orders are also non-cancellable and non-returnable. These conditions transfer forecast risk to the purchasing organization once an order is accepted.
The May 1, 2027 final shipment date is a shipping boundary, not a statement that fresh orders remain open until then. Orders had to be accepted by November 1, 2026. Delivery scheduling, quantities and availability continue to depend on the accepted order and the supplier’s remaining execution capacity. Existing channel inventory may extend commercial availability in some cases, but it does not reopen the manufacturer’s factory-order window or change the lifecycle status.
Alternate Families and Qualification Boundaries
The notice names Si5392, Si5394 and Si5395 as alternate materials for the discontinued entries. That designation provides a migration direction, but it does not establish automatic interchangeability for every design. The original document does not claim pin compatibility, identical package dimensions, equivalent register behavior or qualification continuity across all listed devices and boards.
A controlled transition therefore separates commercial substitution from engineering qualification. The comparison set includes frequency plans, input and output counts, package and pinout, control interface, power rails, jitter performance, alarm behavior, firmware dependencies and board-level timing requirements. Evaluation-board replacement also requires its own treatment because an alternate device does not necessarily preserve the same development workflow, connectors or configuration files.
BOM Exposure at the Exact-MPN Level
The product list includes closely related suffix variants, which makes family-level screening insufficient. A BOM containing an Si5368 or Si5369 reference still requires a match against the complete orderable number in the notice. GQ and GQR entries can represent different packing or order configurations even when the underlying device function is related. Evaluation boards are separately listed and can affect laboratory support plans even when production hardware has already migrated.
The most reliable exposure record links each exact MPN to open demand, accepted purchase orders, scheduled shipments, on-hand inventory, repair obligations and the status of the alternate design. That record also keeps lifecycle risk separate from pricing risk. The notification contains no increase percentage, no transaction-price data and no supplier lead-time range, so none of those conclusions follow from the EOL action alone.
A Transition From Ordering to Execution
With the November 1 milestone reached, the transition moves from order placement to execution. Accepted-order confirmation, shipment scheduling and engineering migration become the central workstreams. For long-life industrial, communications or infrastructure programs, the remaining risk depends on actual lifetime demand, the reliability of accepted supply and the time required to validate an alternate clock architecture.
The timeline leaves six months between the last-order date and the final shipment date. That interval can support delivery and validation activity, but it is not an additional ordering period. It also does not guarantee that all shipments occur on the final date. Supplier acknowledgements and contractual order records remain the authoritative basis for quantities and schedules.
Lifecycle Closure Without a Broader Shortage Claim
The Skyworks notice provides a bounded procurement signal: 23 specified orderable items and evaluation boards reached their last-order acceptance date on November 1, 2026, and final shipments are scheduled for May 1, 2027. The stated drivers are the end of KYEC final-tester support and declining demand. Si5392, Si5394 and Si5395 provide the documented alternate direction.
The resulting risk is concentrated in designs that still depend on the exact listed MPNs. It should not be expanded into a claim of immediate unavailability, a shortage across the Si53xx portfolio or a change in market pricing. The next evidence comes from accepted-order status, shipment execution and completed qualification of the relevant alternate device for each design.