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Every part is pulled, tested, graded and packed with a real lot number behind it.
JiaoDa runs a component counter in an old electronics workshop in Liuyang that ships screened semiconductors, passives, power parts and hard-to-find legacy stock to makers and industrial buyers on every continent. Behind the glass, small labelled drawers hold the references, while the coil winder, the spark-gap rig and a seated crystal do the quiet work of the bench. When a drawing lands on the desk, the pull sheet names one drawer and one lot number, so a box that leaves the building can always be traced back to the very bin that filled it.
A maker prototyping a control board, an assembly house kitting a production BOM or a buyer chasing a part that no longer appears on a maker list all come to the same counter. The desk quotes openly, screens what it ships and writes every figure on the shared ledger. That is the whole promise, and it applies whether the enquiry asks for one transistor or ten thousand pieces of a single code.
Ten years on the counter taught the team one rule: a figure in a catalogue means nothing until the part sits in a graded bin. We pledge bin-accurate fulfilment on every lot, and when a reference no longer exists in current stock, the cross-reference desk finds the pin-for-pin replacement before your board revision closes.
Liuyang Jiaoda Electronic Trading Co., Ltd.Six working programmes run from a single parts wall
Every part that passes the counter travels as a lot on a paper-anchored ledger, not as an anonymous line in a sales report. A lot begins the moment a drawing or a reference reaches the desk, receives a stamp and a bin code, and carries those marks from the first pull to the sealed tray that leaves for a buyers dock. Because the whole building works from drawers and stamps, a screen report, a packing list and a substitute note can all name the same lot and the same bin.
The six programmes below share that single discipline. A routine sourcing order, a fully kitted bill of materials, a surplus shelf entry, a quality screening run, an obsolete part rescue or an export shipment each begin as a pull, move through inspection and testing, and close with grading and a seal. The difference between them is only where a request starts, never how far a drawer of parts is trusted to go by memory alone.
SRCC-0501
Component Sourcing Programmes
When a line needs one hard-to-find transistor or ten thousand stable passives, the sourcing desk walks the bin codes until the lot matches the drawing. Long tail references, alternative tolerances and honest lead time all get written onto the same ledger sheet so a buyer never chases a ghost part.
Tester lead mark: pull verified
KITC-1207
BOM Kitting and Fulfilment
Send us the bill of materials and the bench walks every position against the drawers, bags each value to a clean tray and seals the lot with a printed pick sheet. Assembly partners keep one sign-off per line item so the whole build arrives ready for the production bench rather than in a stack of unlabelled envelopes.
Tester lead mark: count matched
QAC-2219
Quality Screening and Testing
Do not ship a drawer on trust alone. The test bench pulls samples, checks marking, soldering and thermal behaviour, and flags suspect runs before they reach a board. Screening reports ride with the lot so your quality department sees an actual trace to the measured counter.
Tester lead mark: bench signed
MKTC-3088
Inventory Marketplace Systems
Surplus stock does not have to gather dust behind a bench. The marketplace system lists pulled, graded lots on public and private shelves, matches them against live sourcing demand and clears whole bins to buyers who actually need the reference, with the same trace the rest of the counter keeps.
Tester lead mark: shelf live
OBSC-4002
Obsolete Part Replacement
Call it last time buy, call it end of life; boards that outlive their silicon need a home for the missing reference. The cross-reference desk finds pin-compatible substitutes, matched footprints and qualified alternates, then tests the replacement on the bench so the retrofit does not become a redesign.
Tester lead mark: alternate proven
EXPC-5104
Export Documentation Support
Crossing borders feels heavier than the parcel. Every international lot leaves with the packing list, marking and traceability paperwork that customs touchpoints expect, so the drawer of parts reaches a buyers dock as a clean transaction instead of a customs mystery.
Tester lead mark: papers sealed
The test bench run
Every lot travels the same five stops before it is called ready to ship. A probe glyph sits at each stop as the bench moves a bin down the line. No stop is decorative; each one exists because a part that skips a check is the part that fails a board a month later. The run takes minutes for a common value and longer for a critical or undocumented reference, yet the discipline never changes.
A buyer who wants to see how a specific lot was handled can request the screening sheet that each station prints. Those sheets, stamped with the lot number, become the honest paper trail that follows the parts into a box, through a customs declaration and onto a shelf in a far workshop.
The pick ticket fills from one drawer and only one drawer, so the lot keeps a single origin and a clean paper trail from the very first second.
Marking, legs, packaging and date codes are read under the lamp before anything moves on to the next drawer.
Voltage, continuity and a sample load check confirm the part behaves like its drawing and is not a silent substitute.
Good parts move to a grade bin; anything doubtful is set aside rather than shipped onward to someone production line.
Each lot is bagged, sealed and stamped with its number, Packed and Sealed on the plate ready for its export papers.
Open a lot for your next revision
Whether the board needs one stale transistor or a whole kitted BOM, the counter cross-references obsolete parts against current stock before the line pauses. Tell the desk what the build needs, give the reference list and the target quantity, and watch a lot number follow that bin out of the building, finished with screening, grading and the export papers that let it travel.
Request a Lot → Operated by Liuyang Jiaoda Electronic Trading Co., Ltd., No. 83 Chuanxing Group, Juxiang Village, Yonghe Town, Liuyang City, Changsha - 410000, China (CN). Telegram the desk, or write to team@jiaoda.mom.