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.
Regulatory Posture applies to this provider. Its tags matched the
Horizontal (data, software, accessibility, platform) regime, so
Regulatory Posture carries 15 points of the composite.
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applicability map is public and we will correct it.
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.
The six quality facets above are damped to 85 points between them,
because the conditional facet above carries the other
15. That is why each facet's contribution is shown against a damped
maximum: raising a quality facet moves the composite by 85% of its nominal
weight, not 100%. The full arithmetic is at apis.io/rating/.
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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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