# STM809 — documented alternatives

> The closest documented alternative to STM809 is SGMicro SGM809B, graded FUNC (functional alternative that may need board or BOM changes, high confidence). No differences are recorded in the cited evidence; review both datasheets for application conditions. Every match is an engineering-review candidate, not an unqualified drop-in claim.

Canonical page: https://senneon.com/cross-reference/stm809
Data verified: 2026-07-13 · Grading methodology: https://senneon.com/verification

## Graded candidates

| Candidate | Brand | Grade | Confidence | Known differences | Evidence |
|---|---|---|---|---|---|
| SGM809B | SGMicro | FUNC | high | none recorded in cited evidence — review datasheets | official-xref (checked 2026-07-13) |

Commercial terms are quote-only; no price, stock or lead-time claims are published. RFQ: https://senneon.com/rfq?pn=STM809