# LM321 — documented alternatives

> The closest documented alternative to LM321 is SGMicro SGM8271, 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. 2 further graded candidates below. Every match is an engineering-review candidate, not an unqualified drop-in claim.

Canonical page: https://senneon.com/cross-reference/lm321
Data verified: 2026-07-13 · Grading methodology: https://senneon.com/verification

## Graded candidates

| Candidate | Brand | Grade | Confidence | Known differences | Evidence |
|---|---|---|---|---|---|
| SGM8271 | SGMicro | FUNC | high | none recorded in cited evidence — review datasheets | official-xref (checked 2026-07-13) |
| SGM8273-1 | SGMicro | FUNC | high | none recorded in cited evidence — review datasheets | official-xref (checked 2026-07-13) |
| LM321A | 3PEAK | FUNC | high | 3PEAK enhanced variant (suffix A), marginally better key specs; verify against datasheet before swapping | Industry-standard second source; vendor datasheet carries the same part number (checked 2026-07-13) — https://senneon.com/evidence/3peak/datasheet_lm321a-lm358a-lm324a.pdf |

Commercial terms are quote-only; no price, stock or lead-time claims are published. RFQ: https://senneon.com/rfq?pn=LM321