EOL, discontinued part, obsolete part, NRND (not recommended for new designs), last-time-buy part
Obsolescence is a lifecycle event, not an accident. A manufacturer announces that a family is not recommended for new designs, sets a last-time-buy date, sets a last-ship date, and stops. Vehicle programmes run for a decade or more and service obligations run longer, so an EOL notice on a connector or terminal rarely lines up with the end of the harness that uses it.
That leaves a buyer three routes.
Find remaining genuine stock. It exists, distributed across distributors, contract manufacturers and excess inventory, and it is not in one searchable place. This is where an independent distributor with a real supplier network is worth more than a catalogue.
Qualify an alternative. Often the successor family is close but not identical: a different terminal, a different seal, a different keying, sometimes a different mating half, which means a change on both ends of the connection.
Redesign the harness section. The most expensive option and sometimes the only correct one.
The risk in route one is that obsolete, in-demand parts are exactly the parts most attractive to counterfeit and re-labelled supply.
Harness Code works obsolete and EOL parts as a core case: locating remaining stock through verified channels, checking date and lot codes on what comes back, and where no genuine stock exists, proposing an alternative with the functional differences written down rather than glossed over.
Related terms
Allocation and lead time
Allocation is when demand for a component exceeds supply and the manufacturer rations output across customers instead of quoting freely. Lead time is the interval between placing an order and receiving it. When a part goes on allocation, its lead time stretches and stops being a promise.
Counterfeit risk and verified sourcing channels
Counterfeit risk is the risk of receiving fake, re-labelled, recycled or out-of-specification components presented as genuine. It rises sharply for parts that are scarce, obsolete or on allocation, which is exactly when buyers are forced outside their usual channels.
Manufacturer Part Number (MPN)
A Manufacturer Part Number (MPN) is the unique code a component maker assigns to one exact product variant. In automotive connectivity, the MPN fixes housing, cavity count, keying, colour and plating, so two parts with different MPNs are not interchangeable even if they look identical.