Last-Time-Buy Windows: What an EOL Announcement Actually Mea

Last-Time-Buy Windows: What an EOL Announcement Actually Means for Sourcing

A last-time-buy window is the period between an OEM publishing an end-of-life notice and the final date a part can be ordered new. Inside the window the part is documented; outside it, the part is whatever the secondary channel still holds.

We sit on the China side of that window as an independent distributor and sourcing desk — not an authorised channel for any of the brands we handle. That independence is what allows us to look outside the announced cutoff when the cutoff has passed, and it also sets hard limits on what we can deliver during the window itself. This piece walks through what a window looks like in practice, what to send us if you want to use it, and what changes once the door closes.

By the aoctrl sourcing desk. Data through Q3 2026, last updated September 2026.

What an EOL announcement actually contains

A serious EOL notice from an automation manufacturer carries five dates, not one. The first is the announcement date itself — the day the manufacturer publishes a product discontinuation notice (PDN) or a product change notification (PCN) on its newsroom. The second is the last order date, sometimes called the last-time-buy cutoff, after which new orders are not accepted through the authorised channel. The third is the last shipment date, often months after the last order date, after which the manufacturer stops physically delivering new units. The fourth is the end of the standard warranty period for products already shipped. The fifth is the end of the repair-commitment window, after which the manufacturer stops guaranteeing that service parts or repaired modules will be available.

The five dates are not the same. The most expensive mistake is to read the announcement date and assume the part is already gone. For a Schneider TeSys D contactor, for example, the time between announcement and last order can run nine to eighteen months; for a controller or drive module, the gap between last order and last shipment is often six to twelve months; the repair-commitment window commonly extends five to ten years beyond that. None of those numbers is universal, and we are deliberately not quoting them as if they were.

What matters for the buyer is the sequence: there is a long window during which new units are still orderable from the franchised channel, then a longer period during which the channel can still service the installed base, and then — at some later point — the part genuinely disappears from new production. Anyone who is told a part is "end of life" should ask which of those five dates the conversation is actually about.

What an independent desk can do during the window

The authorised channel's job during a last-time-buy window is straightforward: take orders, allocate supply, ship against the order book, and stop taking orders on the cutoff date. We do not have that role. We sit next to it.

Three things we can usefully do while the window is still open. First, we can quote the original part through whatever authorised and non-authorised channels the line is still flowing through, with the same part number and the same condition language as the OEM uses. That is most useful for buyers whose own authorised supply has already hit allocation, because the authorised channel often concentrates allocation on long-standing accounts and squeezes out smaller or one-off buyers during the final months of a window. Second, we can quote the same part in a non-authorised configuration — for example, factory-sealed surplus, panel-shop residual stock, or refurbishment line output — provided we state the condition per line and document the chain. Third, we can begin the documentation work for the post-window phase: taking a sample of the part, photographing the marking and the connector face, recording the firmware generation, and writing down what the datasheet does and does not say.

What we cannot do during the window is extend it. If the OEM has set a last-order date of 31 March, we cannot move that date for a buyer who comes to us on 15 April. The independent market still has stock after that date, but the stock is no longer "last-time-buy from the manufacturer" — it is whatever the secondary market happens to be holding, with whatever chain of custody that implies.

What slips after the window closes

Once the manufacturer's last-shipment date has passed, the demand does not pass with it. A control cabinet built in 2014 with a TeSys D contactor, an Altivar drive, or a Modicon Premium CPU still needs spare contactors, drives and CPUs in 2026, and it will need them again in 2028 and 2030. The supply side narrows to three surviving routes, and an honest sourcing desk names them rather than papering over the difference.

The first route is remaining channel stock — what the manufacturer, the long-standing supply network, the panel shops, and the machine builders themselves still hold. This stock is finite and tends to deplete fastest at the popular ratings: common coil voltages, common horsepower steps, common I/O counts. The unpopular ratings (unusual coil voltages, odd I/O mixes, regional variants) sometimes persist for years after the popular ones have dried up. The second route is documented cross-reference — a different part that the engineering team can verify, axis by axis, against the original. The cross-reference work belongs in your engineering process, not in the supplier's catalogue, because it is your program, your cabinet layout, and your safety scope that have to keep holding. The third route is last-time-buy itself: the buyer purchased enough during the window to ride out the remaining life of the machine or the line. When that last-time-buy stock runs out, the buyer is on routes one and two for the rest of the machine's life.

We work all three routes. What we will not do is silently swap a discontinued line for a "similar" one on a quote, or describe used equipment as refurbished so that a maintenance buyer can pass it through a quality process that expects factory-sealed parts. The three condition words — new, refurbished, and used — are kept separate, and each line on a quote carries its own condition.

How the 12-axis discipline applies after a part goes EOL

When a TeSys D contactor reference moves from active production into last-time-buy, the natural temptation is to drop in a current production reference with a similar coil voltage and ampere rating. That is rarely the right answer, and the reason it is rarely the right answer is that a contactor and a controller differ on at least twelve axes, not just two. Our cross-reference table is built on those axes, and the rules are the same whether the comparison is being run during the window or after it.

For a TeSys D LC1D contactor versus a current TeSys D contactor at a different reference, the axes that almost always differ or remain unverified are: the function state and the auxiliary contact arrangement (the N/O and N/C count is encoded in the suffix and not visible from the coil voltage alone), the terminal layout and the terminal numbering (D-line and LC1D-line references share the outline but the front-face numbering has shifted across generations), the conformance scope (CE, UL listed, CCC, EAC where applicable — these are stated per reference, not per series), and the lifecycle status itself. The outline, the mounting holes, and the panel cut-out are typically matched across the D family. The rated current at AC-3 and the per-channel terminal torque are typically matched. The materials, the flame-retardant rating, and the plating are usually matched but the manufacturer does not always publish the figure for the older reference, which is why several rows of the comparison end up marked unverified rather than matched or differs. The firmware and protocol axes do not apply to a contactor, so they are listed as not applicable rather than unverified. This is the shape an honest substitution table takes, and it is the shape we put on a quote — every axis stated, the unknown ones named rather than guessed.

For a Modicon Premium TSX CPU versus a current M340 or M580 CPU, more of the axes diverge or are unknown: the program portability axis in particular is not something we can verify for the buyer, because it depends on the program, the instruction set used, the project file format, and any vendor-specific function blocks. The communication protocol (Modbus, Ethway, Ethernet on the newer side) typically differs. The environmental class, the IP rating, and the operating temperature range usually match. The dimensions and the panel cut-out are different, which means cabinet rework is almost always required and the substitution is the wrong answer for a buyer who needs the cabinet untouched. Where the substitution is the wrong answer, the right answer is to keep sourcing the original during the remaining channel-stock window, or to plan the migration as a redesign rather than a replacement.

The verification step is the same in both cases: any comparison we publish is intended to be checked against the original manufacturer datasheet and your own qualification process. We do not issue compatibility certificates, and any supplier — including us — that claims the parts are interchangeable without that verification step is guessing.

A worked shape: the Schneider TeSys family

Schneider Electric publishes lifecycle state on the TeSys platform in roughly four phases: commercialised, phase-out, last-time-buy, and end-of-life. A buyer who is told a TeSys D contactor is "end of life" is usually being told one of three different things, depending on which specific catalogue reference is involved. Some references are still in active production with lead times measured in weeks. Some have moved into phase-out, where the manufacturer still accepts orders but has flagged the line for retirement. A smaller subset has reached last-time-buy, with a published cutoff date and a published last-shipment date behind it.

In each case, the practical question is the same: what is the longest we can keep this control cabinet running on original parts? For a cabinet that was built in 2018 with TeSys D contactors in standard coil voltages, the answer is usually: long enough that stocking a 1:1 replacement during the phase-out window is the right move. For a cabinet that depends on a specific TeSys GV2 motor-circuit-breaker catalogue reference with a non-standard auxiliary contact arrangement, the answer is usually: do that stocking now, because the non-standard auxiliary is the line that depletes fastest. We can quote both — the standard-coil TeSys D stock that is plentiful, and the non-standard-auxiliary GV2 line that is thinning — and we will tell you, per line, what we see in the channel.

The same shape applies to the Modicon Premium (TSX) controller family, which has been moving through phase-out across multiple product groups for some years. The CPUs and the backplanes tend to thin out first; the I/O modules and the racks persist a little longer; the programming cables and the memory cards thin out fastest of all, because they are small, easy to lose, and frequently replaced. A buyer who sends us a 30-line Modicon Premium BOM and asks "what is still available" is usually going to receive a quote where eight of the 30 lines are clean, twelve have condition caveats, six are flagged as firm only against an immediate order, and four come back as "no longer seen in the channel — confirm the part number against the door label and we will try again." That split is normal for a platform in phase-out.

What to send us if you want to use the window

Three pieces of information shorten the path through the window. The first is the part number as it appears on the door label of the controller, the side of the contactor, or the front of the drive — not the part number on the cabinet drawing, because drawings are routinely revised and the part number on the drawing is one revision behind. The second is the quantity per line and any flexibility you have on the quantity, because the most expensive line in a multi-line BOM is usually not the one that is hardest to find — it is the one that needs an exact quantity that the upstream pack does not divide cleanly into. The third is the application context: a bottling line in St. Petersburg that needs the part to land within three weeks for an emergency repair is a different sourcing problem from a control cabinet build in Yekaterinburg that needs the part by the end of the quarter.

When several lines need to ship together we consolidate them into a single consignment, with one shipment, one set of documents, and one customs entry where DAP or DDP is the agreed term. We respond with one quote per line — price, MOQ, lead time and condition stated per line item rather than blended into a single figure. Each line item we stock or can source carries its own chain of custody and its own per-line warranty, and the lot is shipped consolidated so the buyer receives one consignment rather than several parcels. The condition words follow the three-way separation described earlier: new, refurbished, or used, with the test status and any per-line warranty written into the quote rather than into a generic terms sheet. Delivery is arranged under EXW, DAP or DDP as stated on the quotation; we do not hold our own customs clearance capability inside Russia, and the incoterm selected for a given shipment is the buyer's call once the line-level quote is in hand.

We screen end users and end uses, classify before quoting, and decline transactions that cannot be screened. That sentence is not boilerplate: it is the mechanism that allows us to handle the orders we do take, because the screening is what makes the dispatch possible at all. If you are unsure whether your application falls on the side of the line we will work with, send the description anyway — we will tell you, and we will not invoice a screening fee for telling you no.

What we do not do

Three limits are worth stating plainly. We do not hold EAC, TR CU, ISO 13485, UL or any other conformity mark for the parts we ship; conformity assessment is the importer's responsibility and the certification belongs to the entity that puts the finished product on the market, not to the independent distributor that supplied one component. We do not provide repair services: when a module fails, we source a replacement or a tested alternate, and we do not open the failed module to attempt a board-level repair. We do not certify that a cross-reference will work in your application; the cross-reference table we produce is a documented comparison, and the engineering decision to substitute sits with your team, against your program and your cabinet documentation. These limits are not gaps in the service — they are the boundary that defines what the service actually is.

For an operator-protection loop — a circuit whose integrity must be certified by an external body, where the design is pinned to a specific reference, and where the verification belongs in the buyer's own functional-safety process — a part swap is the wrong answer even when the comparison comes back clean on the form, fit, electrical, and protocol axes. The right answer in those cases is to keep sourcing the original reference during the repair-commitment window, or to redesign the loop as a project rather than a part swap. We will tell a buyer who asks us to substitute on such a loop the same thing we tell them about any part that touches a certified path: that determination belongs to your functional-safety process, and we will not produce a quote that treats it as a commodity cross-reference.

Where to take this next

If you have an EOL notice in hand, send the notice and the BOM in one message to our inquiry desk — the part numbers, the quantities, the door-label photos where you have them, and the application context described in a sentence or two. The line-level quote that comes back will tell you, per line, which of the three post-window routes applies, and where the window itself still has room. For buyers in Russia and the CIS, dispatch is arranged under DAP or DDP where the quotation states it; the commercial term is on the quote rather than on the website, because the term depends on the line, the destination, and what the carrier can clear on a given week.

A discontinued part is a deadline plus three surviving routes. The deadline is fixed; the routes are not.

Data notes

Five-date EOL framework (announcement, last order, last shipment, warranty end, repair-commitment end) reflects the structure of PDN/PCN notices issued by Schneider Electric, Siemens, ABB, Rockwell, and Omron for industrial automation parts, as published on each manufacturer's newsroom and product-support pages. The relative durations are typical; specific dates must be confirmed per part number against the notice.
TeSys D and TeSys GV2 references used as illustrations are real catalogue lines. No specific reference is singled out as discontinued here; check the door label against the Schneider lifecycle page for any reference you are actually quoting.
Modicon Premium (TSX) references used as illustrations are real catalogue lines that have been moving through phase-out across multiple product groups for several years. No specific reference is singled out as discontinued here.
12-axis framework: outline and mounting, dimensions, terminal/interface assignment, electrical ratings, function and I/O specification, firmware and hardware version, communication protocol, mechanical parameters, environmental class, ingress protection and temperature, materials, certification and lifecycle status. Each axis is reported as matched, differs, or unknown on every line of our comparison table.
Worldwide delivery, including Moscow and the regions of the Russian Federation and the CIS, with commercial terms (EXW, DAP, DDP) stated on the quotation. DDP/DAP applies where the quotation states it and where the carrier can clear for the destination in the relevant week.
Screening statement: we screen end users and end uses, classify before quoting, and decline transactions that cannot be screened.

FAQ

What is a last-time-buy window?

A last-time-buy window is the interval between an OEM publishing an end-of-life notice and the last date a new unit can be ordered through the manufacturer's own channel. It commonly runs nine to eighteen months from announcement to last order for a contactor, and six to twelve months from last order to last shipment for a controller or drive, with the repair-commitment period extending further. None of those numbers is fixed across brands or product lines; the actual dates are in the manufacturer's notice.

Can an independent distributor still source a part after the last order date?

Often yes, through remaining channel stock, factory-sealed surplus, or refurbishment line output, with the condition stated per line. What disappears at the cutoff is the authorised channel's willingness to take a new order; the secondary market continues to hold whatever it holds, and that inventory is finite and depletes fastest at common ratings.

How long does the repair-commitment period last after a part goes end of life?

For most automation product lines, the repair-commitment window runs five to ten years beyond the last-shipment date, although this varies by family and by region. The window covers the manufacturer's promise to keep service parts or repaired modules available, not the availability of new units. A buyer who needs longer support than that window offers has to plan the migration during the last-time-buy phase rather than after it.

What should I send to get an accurate quote during the window?

Send the part number as printed on the door label or the side of the unit (not the cabinet-drawing reference), the quantity per line, any flexibility you have on quantity, and a one-sentence description of the application. The door-label part number is the most reliable; cabinet drawings are often one revision behind the installed equipment. With those four pieces we can quote price, MOQ, lead time and condition per line.

Do you ship last-time-buy parts to Russia and the CIS?

Delivery is arranged worldwide, including Moscow, the Russian regions, and the CIS, with the commercial term stated on the quotation rather than announced as a general policy. DDP, DAP and EXW are the three terms used; the term selected for a given shipment depends on the line, the destination, and the carrier's clearance capability for the week in question. We do not hold our own customs clearance inside Russia, and we screen end users and end uses before quoting.

How do you state the condition of a last-time-buy or post-window part?

Each line carries its own condition: new, new surplus, refurbished, or used. Refurbished items come with recorded bench-test results and a per-line warranty stated on the quote; used items are sold in their as-removed state with pre-dispatch photographs and no test claim. We do not bundle a lot into one condition label — a 30-line quote will typically carry three or four different condition labels across its lines.

What is the difference between last-time-buy and last-time-ship?

Last-time-buy is the final date on which a new order is accepted through the authorised channel. Last-time-ship is the final date on which a unit physically leaves the manufacturer's warehouse. There is commonly a six-to-twelve-month gap between them, during which the OEM is filling existing orders but no longer accepting new ones. The repair-commitment period begins after the last-time-ship date and runs separately.

When is a cross-reference the wrong answer for an EOL part?

When the part sits on an operator-protection loop whose integrity must be certified, when it sits inside a certified assembly whose scope would change, when the machine documentation pins the design to a specific reference, or when the comparison cannot be verified on the axes the application depends on — typically firmware, program portability, or conformance scope. In those cases, keep sourcing the original during the remaining channel-stock window or treat the change as a redesign rather than a replacement. We will not produce a quote that treats it as a commodity cross-reference.