SJSemi (SJSemiconductor (Jiangyin) Corp.) is a Chinese semiconductor Middle-End-Of-Line (MEOL) pure-play foundry and outsourced assembly and test (OSAT) provider, founded in 2014 as a joint venture between JCET and SMIC and headquartered in the Jiangyin High-Tech Industrial Development Zone, Jiangsu, with offices in Shanghai and Santa Clara, California. The company operates a 12-inch wafer bumping, wafer-level chip-scale packaging, chip probing and final-test line, and supplies advanced packaging and 3D multi-die integration services — Cu pillar, RDL, fan-out, TSV and silicon interposer 2.5D — into smartphone, 5G communications, high-performance computing, data-center and automotive electronics supply chains. It is a contract manufacturer of physical semiconductor packaging services and publishes no public developer program, API, or machine-readable interface contract.
SJSemi is profiled on the APIs.io network. Tagged areas include Company, Semiconductors, Hardware, Manufacturing, and Advanced Packaging.
SJSemi’s developer surface includes product news and 3 more developer resources.
Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for
this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero:
never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and
several others — scorable at all.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/sjsemi: open an issue to ask a question, or submit a pull request to add artifacts.
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aid: sjsemi
name: SJSemi
description: SJSemi (SJSemiconductor (Jiangyin) Corp.) is a Chinese semiconductor Middle-End-Of-Line (MEOL) pure-play foundry
and outsourced assembly and test (OSAT) provider, founded in 2014 as a joint venture between JCET and SMIC and headquartered
in the Jiangyin High-Tech Industrial Development Zone, Jiangsu, with offices in Shanghai and Santa Clara, California. The
company operates a 12-inch wafer bumping, wafer-level chip-scale packaging, chip probing and final-test line, and supplies
advanced packaging and 3D multi-die integration services — Cu pillar, RDL, fan-out, TSV and silicon interposer 2.5D — into
smartphone, 5G communications, high-performance computing, data-center and automotive electronics supply chains. It is a
contract manufacturer of physical semiconductor packaging services and publishes no public developer program, API, or machine-readable
interface contract.
url: https://raw.githubusercontent.com/api-evangelist/sjsemi/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-tier: stub
x-tier-reason: harvest
deliveryModel:
model: unknown
open_source: false
commercial: false
callable_host: false
label: Delivery model not determined — needs a product licence on record
confidence: low
source:
- none
generated: '2026-08-28'
method: derived
accessModel:
pricing: unknown
onboarding: unknown
trial: false
try_now: false
public: false
label: Unknown
confidence: low
source:
- security
generated: '2026-09-02'
method: derived
specificationVersion: '0.20'
created: '2026-08-28'
modified: '2026-08-28'
tags:
- Company
- Semiconductors
- Hardware
- Manufacturing
- Advanced Packaging
- Wafer Test
- OSAT
- China
apis: []
maintainers:
- FN: Kin Lane
email: kin@apievangelist.com
- FN: APIs.json
email: info@apis.io
common:
- type: DomainSecurity
url: security/sjsemi-domain-security.yml
- type: Website
url: https://en.sjsemi.com/
- type: News
url: https://en.sjsemi.com/about/23368/
- type: LLMsTxt
url: llms/sjsemi-llms.txt
x-enrichment:
date: '2026-08-28'
status: minimal
artifacts_added: 3
pass: local-v1
x-coverage:
state: none
reason: not-a-software-company
detail: SJSemi is a contract semiconductor manufacturer — a 12-inch MEOL bumping, wafer-test and advanced-packaging foundry
— whose corporate site carries only HOME / ABOUT US / SERVICE / SCM / JOIN US / CONTACT US, with no developer, API, or
customer-portal section anywhere on it, and whose hosts return 404 for /openapi.json, every /.well-known/ path, robots.txt
and sitemap.xml.
evidence:
- url: https://en.sjsemi.com/
status: 200
- url: https://en.sjsemi.com/openapi.json
status: 404
- url: https://en.sjsemi.com/.well-known/agent-card.json
status: 404
- url: https://en.sjsemi.com/.well-known/api-catalog
status: 404
- url: https://www.sjsemi.com/robots.txt
status: 404
checked: '2026-08-28'
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