1Sem
1 known investors
ONEsemicon designs memory interface chips for server and client memory modules, including registering clock drivers (RCD) and clock drivers (CKD) for DDR4 and DDR5 RDIMM, CUDIMM, and related applications. Its products are JEDEC-standard-compatible and support data rates up to 9200 MT/s and beyond.
Also known as 1Sem · ONE Semiconductor · ONEsemicon
Investors · 1
Company profile
researched Aug 2026ONE Semiconductor (1semicon.com) is a fabless semiconductor company that designs memory companion integrated circuits based on high-speed interface technology. Its stated focus is memory-centric computing and high-speed interfaces for the era following Moore's law scaling.
The published product portfolio consists of registering clock drivers (RCD) and clock drivers (CKD) across DDR generations: DDR4 RCD02 (3200 MT/s), DDR5 RCD02 (5600 MT/s), DDR5 RCD03 (6400 MT/s), DDR5 RCD05 (8000 MT/s), DDR5 RCD06 (9200 MT/s and above), DDR5 CKD01 (7200 MT/s), DDR5 CKD01+ (9200 MT/s and above), and a DDR6 RCD01 device.
Business model
Fabless model: the company designs memory companion ICs and does not indicate ownership of manufacturing facilities. It maintains separate sales and technical-support channels for customer engagement.
Traction
The company publishes a multi-generation product line spanning DDR4, DDR5 and DDR6 memory companion ICs, and is recruiting for engineering and other roles.
▸Full profile — technology, go-to-market, geography
Technology
The company develops high-speed memory interface silicon, specifically registering clock drivers and clock drivers used alongside DRAM. Its listed devices span DDR4 at 3200 MT/s, DDR5 from 5600 MT/s up to 9200 MT/s and beyond, and a DDR6-generation RCD, indicating a product roadmap organized around successive DDR data-rate generations.
Go-to-market
Direct customer contact through dedicated sales and technical support email channels listed on the company website.
Geography
Contact information lists a South Korean telephone number (+82-31 area code).
Compiled by commissioned research from 6 cited public sources — announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed — not independently audited.
▸Research sources · 6
primary sources listed
- 1Sem1semicon.com · web
6 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does 1Sem do?
- Fabless semiconductor company designing high-speed memory companion ICs such as DDR4/DDR5 RCDs and clock drivers.
- Who are 1Sem's investors?
- 1Sem's investors include Kiwoom Investment.