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China Worx sources electronic components that your normal channels can no longer supply: end-of-life and obsolete parts, allocated and shortage parts, and components that are mainly available through the Chinese supply chain. Our engineers in Shenzhen verify every part before it reaches your line, and they will tell you when redesigning around a part is cheaper than chasing it.
Four situations account for almost every procurement enquiry that reaches us. They need different responses, and the most expensive mistake is treating them all as a buying problem.
MCUs, FPGAs, power, analog, logic and memory, including allocated and constrained parts.
DRAM and flash, including legacy DDR3 and DDR4 for industrial and embedded platforms.
LCD, OLED and touch modules, matched on interface, timing and mechanical envelope.
Displays & touchImaging, motion, environmental and specialty sensors, with their driver and calibration constraints.
Modules and sub-assemblies, from lens stack through to interface and tuning.
Cells, modules and balance-of-system components.
Finished and semi-finished assemblies sourced and qualified to your specification.
MLCCs, inductors, crystals and connectors: the parts that stop a build when one line of the BOM goes short.
If it has a part number, send it. If it does not, send the drawing or the sample.
Every part you buy arrives through one of four channels. They differ enormously in price, traceability and risk, and most buyers only discover the difference after something goes wrong. This is the framework we work through, in order, before quoting anything.
| Channel | What it is | Traceability | When it is the right answer |
|---|---|---|---|
| Franchised / authorised | Distributors contracted by the manufacturer. Stock comes directly from the factory. | Complete. Unbroken chain to the manufacturer. | Always first. If the part is available here at a workable lead time, nothing else is worth considering. |
| Franchised excess | Surplus inventory released by authorised distributors or by other OEMs, sold through documented channels. | Strong. Original packaging and documentation usually intact. | When authorised stock is gone but the part was recently in production. Routinely cheaper than the broker market and much safer. |
| Independent distribution | Stocking distributors operating outside manufacturer franchise, typically with their own inspection capability. | Variable. Depends entirely on the distributor's quality system. | For obsolete parts where no authorised stock exists. Ask which quality standard they operate to before you ask the price. |
| Open / broker market | Parts traded between holders, often several times, with documentation quality degrading at each hop. | Weak to none. This is where counterfeits enter. | Last resort, and only with independent verification budgeted into the price from the start. |
The commercial point is simple: the further down that table you go, the more of your money should be going into verification rather than into the parts.
A discontinuance notice gives you two dates that matter: the last order date and the last shipment date. Under the joint IPC/JEDEC notification standard for product discontinuance (J-STD-048), suppliers are expected to give customers structured advance notice of both. The equivalent standard for process and product changes, J-STD-046, covers the changes that do not kill a part outright but can still invalidate your qualification. Treat them as a deadline to plan against.
The instinct is a large last-time buy. Sometimes that is right. More often there is a cheaper path, and it is only visible if you work the options in order:
Which of those is correct depends on numbers, not on preference: annual demand, remaining product life, cost of capital, storage cost, requalification effort, and the probability that you will be doing this again in three years. We will work that arithmetic with you before recommending a purchase, and if redesign is the better answer, we will say so.
Counterfeit avoidance works as a graded response, and the grade should follow what a failure would cost you rather than the price of the part. A re-marked logic gate in a €40,000 machine is a far worse outcome than its unit price suggests.
Two standards define the vocabulary here. AS6081 is the counterfeit-avoidance standard written for distributors buying outside authorised channels, and it governs how parts are procured, inspected and documented. AS6171 is the family of test methods for evaluating parts already suspected of being counterfeit. It is worth asking any supplier which of the two they work to.
| Risk tier | Typical case | What we run |
|---|---|---|
| Baseline | Documented channel, recent date codes, low consequence of failure | Documentation and chain-of-custody review, date-code and lot consistency, packaging and label inspection, high-resolution external visual against a known-good reference |
| Elevated | Open-market purchase, older date codes, or a part on a critical net | Baseline, plus solvent and abrasion testing for re-marking, X-ray of the die and lead frame, XRF on the lead finish, and electrical parametric checks against the datasheet |
| Critical | Safety, medical, avionics, industrial installed base, or high replacement cost in the field | Elevated, plus decapsulation and die verification, curve tracing across the pin set, and destructive physical analysis on a sample, with the sample size agreed in advance against the lot size |
Not every part needs every test. We agree the tier before purchase, price it into the quote, and give you the results as documentation you can hand to your own auditors.
Storage is where many bridge buys quietly fail. Surface-mount parts are classified by moisture sensitivity level under IPC/JEDEC J-STD-020, and their handling, packing and floor life are governed by IPC/JEDEC J-STD-033. Each MSL rating carries a floor life: the total time a part may spend out of a moisture barrier bag before it must be baked. Exceed it and reflow can vaporise absorbed moisture inside the package, delaminating it from the inside. The industry calls this popcorning, and it does not always show up on an electrical test.
A five-year bridge buy is therefore also a storage commitment: sealed moisture-barrier bags with fresh desiccant and a humidity indicator card, controlled and recorded conditions, bake-before-use where the floor-life window has been exceeded, and documentation good enough that a part bought today still passes incoming inspection in 2031. We specify and document those conditions as part of the sourcing engagement, because parts that fail incoming inspection in three years leave you with the same shortage and a sunk cost.
Not Recommended for New Designs. The part is still in production and still buyable, but the manufacturer is signalling that it will not be forever. NRND is the early warning and the right moment to start planning.
End of life means production is ending on a published schedule and last-order and last-ship dates exist. Obsolete means those dates have already passed and no new parts are being made. The distinction matters: EOL still gives you access to authorised stock, obsolete does not.
Last-time buy. The final order you may place through authorised channels before the last-order date. Sizing it correctly requires a demand forecast, a scrap-risk assumption and a view on cost of capital; it is a financial calculation.
Product change notification and product discontinuance notification. The formal notices a manufacturer issues under J-STD-046 and J-STD-048 respectively. A PCN can be as disruptive as a PDN if the change invalidates your qualification. A die shrink or a fab transfer is not always transparent to your design.
Demand exceeds supply, so the manufacturer rations output across customers by historical volume. Small buyers are squeezed first and hardest. Allocation differs from obsolescence because the part is coming back, but the cash-flow and schedule damage in the meantime is the same.
A known-authentic reference unit, obtained through an authorised channel and retained, against which later deliveries are compared: markings, package geometry, die and electrical signature. Inexpensive to keep, and very useful the day a questionable lot arrives.
A procurement enquiry moves as fast as the information behind it. To come back with something real rather than a holding reply, we need:
MT41K256M16TW-107 and MT41K256M16TW-107 IT:P are different orderable parts and often have very different availability.We reply to enquiries within one business day. If we cannot help, we will tell you quickly.
We hold no inventory, so every recommendation starts from your requirement. Every part we quote comes with a documented chain of custody, and where the open market is the only source, we explain the risk and price the verification in before you commit. When a redesign is the better answer, we say so.
Insights
When a part goes EOL, you have more options than a last-time buy. Authorised stock, franchised excess, re-engineering and qualified alternates.
Read ProcurementRe-marked parts, recycled silicon, empty packages. The checks we run on hard-to-source components: date codes, decap, X-ray and electrical test.
Read TrustAn NDA is the starting point. What else keeps your design yours, from how you split a BOM to who holds the tooling.
Read HardwareStarted early, DFM removes cost and risk from every line of your bill of materials. Here is what actually moves.
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