# SJSemi

> SJSemiconductor (Jiangyin) Corp. — a Chinese Middle-End-Of-Line (MEOL) pure-play
> semiconductor foundry and OSAT provider founded in 2014 as a JCET/SMIC joint venture.
> SJSemi manufactures: 12-inch wafer bumping, Cu pillar and RDL, wafer-level chip-scale
> packaging, chip probing and final test, and advanced 3D multi-die integration including
> fan-out, TSV and silicon-interposer 2.5D packaging. Its customers are chip designers
> in smartphone, 5G, high-performance computing, data-center and automotive markets.

## Important for agents

SJSemi publishes **no public API, no developer portal, and no machine-readable interface
contract**. It sells physical manufacturing services under commercial supply agreements,
not software. As of 2026-08-28 there is no OpenAPI, AsyncAPI, GraphQL SDL, MCP server,
A2A agent card, `/llms.txt`, `robots.txt`, `sitemap.xml`, or any `/.well-known/` document
served from any SJSemi host. Do not attempt to construct or call an SJSemi API endpoint;
none is known to exist. Engagement with SJSemi is a sales and supply-chain conversation
conducted through its contact page.

## Company

- [Corporate site (English)](https://en.sjsemi.com/): company overview, services, global presence.
- [Corporate site (Chinese)](https://www.sjsemi.com/): primary-language site.
- [About SJSemi](https://en.sjsemi.com/about/): history, honors, quality management, CSR.
- [News center](https://en.sjsemi.com/about/23368/): company announcements and press releases.

## Services (manufacturing, not APIs)

- Wafer bumping — 12-inch solder and Cu pillar bumping.
- CP testing — chip probing and wafer-level test.
- WLP — wafer-level packaging including WLCSP and fan-out.
- APDP — advanced packaging and 3D multi-die integration, silicon interposer 2.5D.

## About this file

- Generated by the API Evangelist enrichment pipeline on 2026-08-28 from this repository's
  `apis.yml` plus live probes of SJSemi's own hosts. Method: generated.
- SJSemi does not publish its own `/llms.txt`; `https://en.sjsemi.com/llms.txt` did not
  return a document when probed on 2026-08-28.
- This is a third-party profile. See the repository README for provenance and corrections.