---
title: "Datasheet changes of a MOSFET by part number"
method: POST
path: "/v1/datasheet/changes"
tags: ["datasheet"]
---

# Datasheet changes of a MOSFET by part number

`POST /v1/datasheet/changes`

## Request

- Base URL: `https://api.relaex-engineers.de`
- URL: `https://api.relaex-engineers.de/v1/datasheet/changes`
- Auth: none declared

Datasheet changes of a discrete MOSFET, from the part number alone.

**Input:** JSON `{"mpn": "<part number>", "since": "YYYY[-MM[-DD]]"}`; `since` is optional.

**Behaviour:** finds the current datasheet at the manufacturer's download URL (TI, Nexperia,
onsemi, Infineon) and earlier revisions in the Internet Archive (ST only there). Copies with the
same text, or the same printed revision and date, count as one revision. Without `since` the
newest revision is compared with the one before it, with `since` with the revision valid at that
date. The comparison is the Datasheet Revision Compare engine (eight table parameters with
conditions, sources and review priority).

**Output:** `ApiResponse` with `mpn`, `manufacturer`, `snapshots_found`, `revisions` (newest
first: printed revision and date, capture date, manufacturer and archive URL, SHA-256), `status`
(`compared`, `no_change`, `single_revision`, `not_found`) and `comparison` (the engine report).

**Errors:** 422 `INVALID_MPN`, `UNKNOWN_MANUFACTURER`, `OUT_OF_SCOPE`; 429; 504 when the
archive is too slow (fetched files are cached, a retry is faster).

**Languages:** responses are in English. Error, warning and rule codes are stable and
language-neutral; agents may translate messages for the user. Datasheet labels in English or German are recognised.

**Access:** open, rate-limited per IP and per MCP session; an `X-API-Key` header raises the
limit. Uploaded files are processed in memory and never stored. Also available as MCP tool
`datasheet_changes` at `/mcp` (Streamable HTTP).

## Request body

- ChangesRequest
  - `mpn` string, required: Manufacturer part number
  - `since` string, nullable: Compare the newest revision with the one valid at this date (YYYY[-MM[-DD]])

## Response `200`

ApiResponse with the revision history and the comparison

- unknown

## Other responses

- `422`: INVALID_MPN, UNKNOWN_MANUFACTURER, OUT_OF_SCOPE
- `429`: RATE_LIMITED
- `504`: ANALYSIS_TIMEOUT

---

[API](https://skmtc.dev/relaex-engineers/apis/boring-api.md) · [All operations](https://skmtc.dev/relaex-engineers/apis/boring-api/llms.txt) · [OpenAPI document](https://skmtc.dev/relaex-engineers/apis/boring-api/revisions/269481105eb2?raw)