# W25Q40JV — documented alternatives

> The closest documented alternative to W25Q40JV is GigaDevice GD25Q40E, graded FUNC (functional alternative that may need board or BOM changes, medium confidence). Key difference to review first: Industry-standard SPI NOR pinout (SOP8/USON8/WSON8); most of the command set is compatible. Every match is an engineering-review candidate, not an unqualified drop-in claim.

Canonical page: https://senneon.com/cross-reference/w25q40jv
Data verified: 2026-07-13 · Grading methodology: https://senneon.com/verification

## Graded candidates

| Candidate | Brand | Grade | Confidence | Known differences | Evidence |
|---|---|---|---|---|---|
| GD25Q40E | GigaDevice | FUNC | medium | Industry-standard SPI NOR pinout (SOP8/USON8/WSON8); most of the command set is compatible; Status-register layout, QE bit default and security-register implementation vary by vendor — verify firmware and production programmer; AC timing and deep-power-down parameters differ; check datasheet before swapping | Density / voltage / interface follow naming convention — industry second-source practice (checked 2026-07-13); GigaDevice 2026 selection guide, Flash parametric tables (E5) (checked 2026-07-13) |

## Parametric comparison (manufacturer-sourced)

| Spec | GD25Q40E |
|---|---|
| Flash | 4Mb |
| Package | USON8 1.5x1.5mm USON8 3x2mm SOP8 150mil SOP8 208mil |

Commercial terms are quote-only; no price, stock or lead-time claims are published. RFQ: https://senneon.com/rfq?pn=W25Q40JV