W25Q128JVSIQ is a Winbond serial NOR Flash order code, not an FPGA. Its suffix matters to both the footprint and the host firmware. Use the complete code when checking a BOM: a catalog entry abbreviated to W25Q128JV does not identify every interface option.
Lifecycle and exact-device facts
New-design consideration: on October 12, 2026, Winbond's exact-part page lists Industrial Status N, defined there as not recommended for new design. That is not the same as an end-of-life notice or a statement about WWDParts stock. Recheck the manufacturer status when selecting a part for a new design. Source: Winbond W25Q128JVSIQ product status and specifications.
| Item | W25Q128JVSIQ |
|---|---|
| Memory | 128 Mbit = 16 MiB |
| Package | 8-lead SOIC/SOP, 208-mil body designation |
| Supply | 2.7–3.6 V |
| Temperature | −40 to +85 °C |
| Interface | Standard, Dual and Quad SPI; do not assume QPI or DTR from this code |
What changes between SIQ and SIM?
In the cited W25Q128JV ordering table, S denotes the 208-mil SOIC package and I the industrial temperature grade. Q has QE fixed to 1; M has programmable QE with default 0 and a different device ID. SIQ versus SIM is not a 208-mil versus 150-mil package distinction. QPI/DTR capability needs the applicable DTR datasheet. See Winbond W25Q128JV datasheet, Rev. G (April 8, 2019), ordering information.
For a purchasing substitution request, capture a photograph of the offered marking and the complete order code in the quotation. Compare the package drawing with the approved footprint, then compare the device ID and initialization expected by the boot ROM or driver. A mechanical match only answers the first part of the question. Keep the sample tested for firmware behavior identifiable by its lot and ordering information.
Eight-pin connection reference
| Pin | Signal |
|---|---|
| 1 | /CS |
| 2 | DO / IO1 |
| 3 | /WP / IO2 |
| 4 | GND |
| 5 | DI / IO0 |
| 6 | CLK |
| 7 | /HOLD / IO3 |
| 8 | VCC |
The datasheet's SOIC pin table is the reference for numbering and orientation. With QE fixed at 1, IO2 and IO3 serve the quad interface rather than the /WP and /HOLD functions. Pin 7 is not a configurable dedicated reset input on this eight-lead order code. Check Winbond W25Q128JV datasheet, Rev. G (April 8, 2019) before assigning these signals in the schematic.
During layout review, inspect the pin-1 orientation, connector wiring and continuity to the host, rather than relying on matching signal names in two library symbols. Keep the flash supply and host I/O voltage in the same interface review. Do not connect a programmer solely because its socket accepts the package; confirm its supply setting and bus-driver levels first.
A staged bring-up plan
Begin with a conservative clock and single-lane transactions supported by the host and flash. Record the device-identification response and status registers before modifying anything. Read a known pattern from a designated test area, then qualify the intended read mode. Separate device detection from erase/program testing so a wiring fault is not confused with protection configuration.
For quad operation, compare the captured command, address, dummy cycles and data lanes with the selected instruction diagram. Check initialization after a genuine power cycle as well as a warm processor reset. If a board works only after a debugger has run, preserve that failing startup trace before adding register writes that might conceal the cause.
Qualify the chosen clock at the intended supply and temperature conditions. A part-page maximum does not prove that a board, cable or programmer can operate at that speed. Test long sequential reads and short random reads separately, then compare every returned byte against the known pattern. The error location and read length often provide a more useful diagnostic than a single pass/fail result.
Replacement and procurement review
Do not approve another manufacturer's Flash from density and package alone. A practical comparison also covers identification, supported commands, mode entry and exit, protection defaults, power-up behavior and host-driver support. Test the actual boot sequence and field-update path with the candidate. This article does not designate any listed family as a drop-in replacement.
For firmware partitioning and update recovery, continue with the W25Q128JV 16 MiB firmware-layout guide. That guide handles software storage decisions; this page is the order-code and board-interface reference.
Document basis: the linked Rev. G PDF supports the detailed suffix and pin discussion. Winbond's current documentation index lists a newer datasheet; consult that release for design signoff. The dated lifecycle observation above comes from the current exact-part page, not the older PDF.
Ordering and sources
Send the complete manufacturer order code, quantity, required date and any lot or documentation requirements. WWDParts confirms availability, price and delivery terms in the written quotation. Search W25Q128JVSIQ or prepare an RFQ.
- Winbond W25Q128JV datasheet, Rev. G (April 8, 2019)
- Winbond W25Q128JVSIQ product status and specifications
- Winbond current W25Q128JVSIQ documentation index
Reviewed October 12, 2026. Document revisions are identified above. Engineering budgets and test plans are examples, not measured results or replacement approvals.