On the latest Force Tech Talk, we tried something different. Karen, Ben, and Eder pulled questions out of a Force-branded bag and answered whichever one came out first. No script. Here are the five questions engineers keep sending in, and the honest answers that came back.
Why are end-of-life notices so short these days
Notice periods have got shorter because the semiconductor industry has consolidated. Fewer manufacturers, fewer factories, and a decision to discontinue a chip can now be made and acted on inside six months.
There are two more things going on. Distribution does not always pass last-time-buy notices through quickly, so the window can shrink before the engineer who needs the part hears about it. And manufacturers sometimes use the notice itself as a market test. They float the end-of-life, watch the orders come in, and reverse the decision if demand looks strong enough.
There is also an old defence-sector quirk that still bites. Some primes have only kept component records for five years, so a part that has not been ordered for longer than that can quietly disappear off the radar before anyone realises.
What are the biggest engineering mistakes under time pressure
The mistakes are nearly always shortcuts. Someone is told they need parts yesterday, and the corners that get cut are the ones that protect quality.
The big four Ben sees most often:
- Going outside the franchised supply chain without proper checks, which is when counterfeits walk in.
- Skipping qualification on the replacement device and trying to qualify the finished board instead.
- Snap decisions on alternative parts that have not been properly reviewed.
- Buying residual stock at gouged prices on the open market because everyone else is doing the same.
Pressure flows downhill. The fix is structural rather than personal. Build supplier assurance in before the crisis lands, not during it.
We missed the last-time-buy. What now
First, do not panic. Missing a last-time-buy notice is recoverable more often than not, and there are nearly always options.
The first move is to pick up the phone to your approved supply chain or an obsolescence specialist who can either solve it or point you at someone who can. If the part has only just gone obsolete, there is usually some stock floating around through approved channels, although you will be competing with everyone else in the same situation, and prices will reflect that. Where the silicon die has been preserved, a specialist provider can re-package and re-test the part to the original specification, which is the route we use through our Titan Long Term Storage facility in the south of the UK.
The point Karen keeps coming back to is the one worth repeating. Get close to your supply chain before you need to. Trolling the world for the last few thousand pieces just pushes the price up for everyone.
Form Fit Function or one-to-one replacement. What is the difference
A Form Fit Function (FFF) replacement is a part that fits the original footprint and matches 99 to 100 percent of the electrical performance, but the customer still needs to review and qualify it. A one-to-one replacement is more straightforward. It is pre-qualified against a shared drawing, the kind you see with 5962 DESC numbers, where several manufacturers are already approved against the same overall specification.
Ben’s worked example. If the original part on a board was an Atmel device qualified under a 5962 DESC drawing, and Atmel is no longer available, you can usually order an AMD or Xilinx alternative qualified against the same drawing as a direct one-to-one replacement. Different OEM part number, same DESC, drop it in. If no such pre-qualified alternative exists, an FFF is the next step and the customer takes on the qualification work.
How do you balance Just-in-Time with a 30-year platform
You cannot, and that is the honest answer. Just-in-Time assumes a stable supply of equivalent parts, which is exactly what long-life defence, aerospace, rail, medical, and industrial platforms do not have. Eder put it well. JIT for a 30-year system is not realistic at the system level.
What is realistic is making the response system itself lean. The leanest position a customer can take is knowing what they will need over the next 10 years, because that allows a single well-priced bulk buy and removes exposure to year-on-year price increases. Storing die in a controlled facility means specialist providers can assemble and test devices in a six to eight week cycle, which is closer to genuine JIT than open-market scrambling will ever get.
Sometimes we end up holding die for customers who insisted they would not need more, simply because the usage history said otherwise. It is a dance, as Karen calls it. You know they will need it, they know they will need it, but if their system says no, you make the judgement call yourself.
Got a question for the next episode
These are the questions that keep landing in our inbox. If there is one you would like the panel to take on next time, send it in. The full conversation is on the Force Tech Talk YouTube channel, including a few bits that did not make it into this article.