Semi-finished USB Board Manufacturer — OEM PCBA Supply
The semi-finished board — 12 × 44 × 4.5 mm, 3.2 g — is the USB flash PCBA without a housing. It is the part that goes inside your own shell, your own branded drive, or your own industrial enclosure. Capacities run from 128MB to 128GB with a USB 2.0 or USB 3.0 interface, and the controller solution is selected to match your requirements. If you already have a housing design or an assembly line and only need the electronic core, this is the product to order rather than a finished drive that you would have to open up.
Specifications
- Dimensions12mm × 44mm × 4.5mm
- Weight3.2g
- InterfaceUSB2.0 / USB3.0
- Flash gradeA+ Grade
- Capacities128MB / 256MB / 512MB / 1GB / 2GB / 4GB / 8GB / 16GB / 32GB / 64GB / 128GB
What you can specify
- Capacity selection (128MB–128GB)
- USB2.0 or USB3.0
- Controller solution
- Supplied as bare board or as an assembly stage
Where it is used
- IoT & embedded devices Board-level integration
- Promotional & corporate gifts Feed your own housing line
Supply notes
- Die formats available: TSOP, BGA, LGA, COB, eMMC
- Controller packages: QFN, 24-pin, 48-pin, COB
- Controller solutions: Alcor, ITE, Xinbang, Micov
Which flash format fits your design
Four formats leave this factory, and the difference between them is mostly mechanical: whether the storage is removable, whether it is sealed inside the product, and who owns the housing. Compare them before you compare prices, because they are not interchangeable.
| Format | What it physically is | Choose it when | The trade you are making |
|---|---|---|---|
| TF card (microSD) | 15 × 11 × 1 mm removable card, 0.25 g | Devices that already have a card slot; storage the end user or field engineer can swap | The socket is the mechanical weak point, and the card is only as good as its grade |
| UDP module | Encapsulated die + controller, no housing, no connector | Sealed, soldered-down storage for small devices — no socket, no shell, no user access | Needs a PCB footprint and reflow assembly; cannot be replaced in the field |
| USB flash drive | Finished drive: connector, controller and housing | Branding, gifting, software and media delivery, retail-ready presentation | Housing, print and packaging — not the silicon — drive the cost and the MOQ |
| Semi-finished PCBA — this page | Assembled flash board, no housing, no branding | Buyers who already own the shell, the print process or the final assembly line | You carry the tooling and the branding yield, and the warranty boundary sits with you |
Applications
Customization
- Capacity selection (128MB–128GB)
- USB2.0 or USB3.0
- Controller solution
- Supplied as bare board or as an assembly stage
What to put in the Semi-finished Board specification
Buying semi-finished means you take over the housing, the branding and the final test. That is a real cost advantage — and it moves a set of responsibilities onto your side of the line, which the specification has to make explicit.
- Board outline and mounting The PCB outline, mounting holes and connector position have to match the shell you already own. Send a drawing or a physical sample — not a description. Read more →
- Component placement keep-outs Where your shell needs clearance, and which side the components sit on. A board that fits but fouls an internal rib is a board that does not fit.
- Capacity and controller Same decisions as a finished drive, but you inherit the firmware behaviour — so confirm power-loss handling and host compatibility at board level. Read more →
- Test boundary Decide what is tested before the board leaves us and what you test after assembly. Anything untested on both sides is untested. Read more →
- Packaging for transit Boards without a shell are exposed to ESD and mechanical damage. Tray, tube or tape-and-reel — and the ESD packaging that goes with it.
- Batch consistency If your product ships for years, the board has to stay identical. Fix the BOM and the firmware version in writing so batch five matches batch one. Read more →
Manufacturing process
Each unit is built from sourced NAND and a controller solution selected to your host and workload, placed and soldered on our own SMT line, programmed, then capacity-verified with a full write-and-read-back and read/write tested before packing. The same configuration is held across repeat batches.
This is for you if
- USB product manufacturers with their own housings
- Assembly lines that only need the electronic core
- Integrators building a bespoke enclosure
This is not for you if
- Buyers who need a finished, ready-to-ship branded drive
- Projects requiring a custom housing — order the custom USB drive instead
What fails in the field, and what prevents it
Semi-finished orders fail at the handover, not at the factory. The four failures below all happen in the gap between what we ship and what you assemble.
The board does not fit the shell you already have
Outline, hole positions and connector height are three separate dimensions, and a drawing that only fixes one of them will still produce a mismatch. Approve a physical first article.
UDP vs COB vs PCB: which format →A defect escapes because both sides assumed the other tested it
Split the test plan explicitly: capacity and read/write before shipment, function and cosmetic after your assembly. Write it into the purchase order so there is no gap.
How memory cards are tested →Capacity behaves differently in the finished product
The board is tested at bench temperature; the product runs warm. If your enclosure traps heat, specify the operating range and test the assembled unit, not just the board.
Capacity drift across temperature →Batch two is not batch one
A silent BOM or firmware change is enough to break compatibility with a shell or a host that was already validated. Freeze both, and re-validate on any change.
Keeping batch two like batch one →Ordering Semi-finished Board: MOQ, samples, lead time and testing
| Question | Answer |
|---|---|
| Minimum order quantity | Set by capacity, controller solution and how much customisation is involved — confirmed with your quotation. See how MOQ is set. |
| Samples | Available, and recommended before volume — particularly for printed artwork or a bespoke mould. See how samples work. |
| Lead time | Depends on configuration, branding and whether tooling is needed. Confirmed in the quotation against your target date. See what drives lead time. |
| Testing | Capacity and read/write verification before packing. You can verify independently with a full write-and-read-back — the method is published here. |
| How to request a quote | Product type, capacity, quantity, application and target date is enough to start. Open the quote form, or see what to include. |
Specify your semi-finished board
Tell us the capacity, quantity, application and target date. We confirm MOQ and lead time against your specification rather than quoting a generic figure — and we reply to business enquiries within 1 business day.
Request a quote for Semi-finished BoardFrom the factory floor
Photographs taken at our own facility in Shenzhen. Nothing on this page is a stock image or a rendering of a product we do not make.
Semi-finished Board — frequently asked questions
What is the difference between this and a finished USB drive?
A finished drive includes the housing, branding and packaging. This is the bare PCBA — the same electronic core without a shell — for buyers who do their own assembly.
Can I specify the controller solution?
Yes. We work with Alcor, ITE, Xinbang and Micov controllers in QFN, 24-pin, 48-pin and COB packages. Tell us your host requirements and we will propose a matched solution.
Are the boards tested before shipping?
Testing is part of our production flow — capacity and read/write verification happens before packing. Tell us the acceptance criteria you work to and we will confirm how the batch is checked.
What is the minimum order quantity?
MOQ depends on capacity and controller selection. Send your specification for a quotation with the confirmed MOQ.