SFA Semicon diligence pack

What they do

• Korean OSAT, the former STS Semiconductor.
• Primary segment: OSAT / Outsourced Assembly & Test.
• Key products in the dataset: mobile memory packaging/test (LPDDR4/5, DDR4/5, eMMC, eMCP), PMIC / audio codec wafer-level packaging, automotive/network/CPU flip chip packaging.
• Market position in that segment: niche.

Role in the chain

• SFA Semicon is a market niche in OSAT (Outsourced Assembly & Test), headquartered in South Korea. Korean OSAT, the former STS Semiconductor.
• Ask: On the step you actually buy, is this company the process owner, a second source, or a distributor? The segment label is not a substitute for that answer.

Counterparties on the graph

• Tracked suppliers: 0. Tracked customers: 6.
• Named customers (first 6): Broadcom, MediaTek, NVIDIA, Qualcomm, AMD, Apple.
• Ask: Which of those edges are in a filing or a primary-source quote, and which are segment-inferred? Do not treat the two as the same fact.

Concentration and replaceability

Operator section

• None of the tracked suppliers are labelled monopoly or leader in this dataset.
• Ask: If the named monopoly or leader supplier stopped shipping, is there a qualified second source on that process step? If the dataset does not name one, do not assume one exists.

Geography and jurisdiction

• Headquarters country in the dataset: South Korea.
• Ask: Where do the fabs, plants or logistics nodes actually sit, versus the HQ country on this record? This dataset records headquarters, not every site.

Public-markets facts (only what is on the record)

Investor section

• Public company, ticker KOSDAQ:036540. A live market cap is on the company profile; this pack does not restate it as a diligence conclusion.
• Ask: What does the latest reported period (if any) say about capacity, backlog and customer concentration? If the company page has no revenue figure, that number is not in this dataset.

Operator checklist

Operator section

• Ask: The dataset names 6 tracked customers for SFA Semicon. How concentrated is demand among those names, and which of them have a documented second source in this graph?
• Ask: SFA Semicon is headquartered in South Korea. What jurisdiction, export-control or logistics risk sits at that HQ, versus at the fabs or plants the filings actually name?
• Ask: SFA Semicon trades as KOSDAQ:036540. What does the latest reported period say about capacity and backlog versus the graph position above?
• Ask: Before treating any edge as a verified relationship, check the provenance labels on the company page and the method note at /methodology.

Investor checklist

Investor section

• Ask: Is the graph position (monopoly / leader / major / challenger / niche) the thing you are underwriting, or a product line the one-liner does not cover?
• Ask: Which named customers in this graph could switch, and which named suppliers could not be replaced in a year? Count only names this dataset actually lists.
• Ask: What is not in this dataset — site-level capacity, contract terms, revenue split by customer — that you still need from a filing or a call?