ATUM

What ATUM does

ATUM is a South Korean transformer and power module manufacturer founded in February 2016 and headquartered in Seoul's Guro Digital Innovation Park. The company specializes in planar transformer technology — a flat-coil architecture that replaces conventional wound coil designs, marketed under its proprietary "Prana Transformer" brand — enabling miniaturization, weight reduction, lower heat generation, and superior EMI performance. ATUM's product portfolio spans three core categories: planar transformers for high-power-density applications (smartphone and laptop PD chargers at 45W–140W); wound-type transformers (LLC, Flyback, PFC, Filter & Choke Coil) for conventional SMPS applications; and EV-specific power modules including OBC, LDC, SMPS, and DC LINK CAP products. The company holds 41 domestic and 15 overseas patents with 10 additional EV-related patents in application, and operates a Vietnam manufacturing facility in Bac Giang Province for cost-efficient global production.

ATUM's business model is exclusively B2B component supply to major Korean OEMs through direct enterprise sales, vendor registration processes, and design-win-driven long-term supply agreements. The company is registered as a first-tier vendor with Samsung Electronics (exclusive supplier of planar transformers for 45W flagship mobile chargers), LG Electronics (multi-transformers, PFC, line filters, and DC-DC inverters for premium OLED/QLED TVs), and Hyundai Mobis (EV transformer and power module supply, registered October 2025). Revenue is generated through hardware sales of proprietary transformers embedded in customer end-products, supplemented by custom design and development services. ATUM achieved KOSDAQ listing in December 2023 (ticker 355690) and has raised approximately KRW 189 billion in cumulative funding, with a 2025–2026 rights offering of KRW 13.96 billion earmarked for facility expansion, debt repayment, and operating capital. CEO Han Taek-soo leads the company, which is IATF 16949 automotive-certified as of August 2024, positioning it for scaled supply into the EV and adjacent emerging markets including data centers, robotics, marine, and defense.

Name

ATUM

Legal name

주식회사 에이텀

Website

https://iatum.com

Company type

Public

Founded year

2016

Operating status

Operating

Short description

ATUM is a South Korean KOSDAQ-listed manufacturer of proprietary planar transformers and EV power modules, supplying Samsung Electronics, LG Electronics, and Hyundai Mobis with miniaturized, high-efficiency transformer components for mobile chargers, premium TVs, and electric vehicles.

Ownership category

akta.pro rank

Product category

Power Transformers and Electronic Components

NAICS

Power, Distribution, and Specialty Transformer Manufacturing (335311)

SIC

Electronic Coils, Transformers & Other Inductors (3677)

akta.pro primary industry

Transformers (Power, Distribution, Instrument, Specialty) (IMAGAAAA)

akta.pro secondary industries

Automotive Charging Hardware Manufacturing (On-board Chargers, Charge Inlets, DC-DC) (IMACAJAK), Automotive Power Electronics & Inverters/Converters Manufacturing (IMACAJAE), Power Delivery & Fast-Charging Accessories (GaN, PD/QC, PPS) (CRACATAI)

Keywords

• Planar transformers
• Power modules
• EV transformers
• SMPS components
• Mobile chargers

Headquarters

HQ city

Seoul

HQ country

South Korea

HQ region

Asia

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Technology or R&D, Operations, Personnel, Infrastructure

Revenue model

1. Transformer and Power Module Product Sales: B2B sales of proprietary planar transformers, wound-type transformers, and EV power modules to major OEMs including Samsung Electronics, LG Electronics, and Hyundai Mobis. Revenue is generated through design wins and long-term supply agreements for transformers embedded in consumer electronics (smartphone chargers, TVs) and EV components.
2. Custom Design and Development Services: Custom transformer design and development services aligned with customer-specific product requirements, providing tailored power solutions alongside standard product offerings.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels3 records

Core offering

ATUM manufactures and sells proprietary planar transformers, conventional wound-type transformers, and electric vehicle power modules for OEM customers in the mobile device, premium TV, and automotive industries. Its signature offering is the Prana Transformer — a globally exclusive flat-coil architecture that delivers miniaturization, weight reduction, low heat generation, and superior EMI performance compared with conventional wound coil designs. The company supplies components that are embedded inside customer end-products such as Samsung 45W+ smartphone chargers, LG/Samsung OLED and QLED TVs, and Hyundai Mobis EV power systems.

Product overview

ATUM is a transformer and power module manufacturing company specializing in small-form-factor, high-performance transformers and chargers. The product portfolio centers on three main transformer categories: (1) 평판형 TRANS (Planar Transformers) featuring innovative flat-coil technology for miniaturization and high efficiency; (2) 권선형 TRANS (Wound Transformers) for conventional SMPS applications; and (3) EV(전장) TRANS for electric vehicle power applications. Additionally, the company offers Module products for portable chargers (PD 45W-120W). The planar transformer line includes PPP TYPE variants using PCB and planar coil technologies, as well as PSPC TYPE for dual-sided PCB applications. The wound transformer line encompasses LLC, Flyback, PFC, and Filter & Choke Coil types across various form factors (PQ, RM, SMD, EE, EER, Toroid, Bar, UU, SQ). ATUM serves diverse markets including mobile devices (smartphone and laptop chargers), TV displays, electric vehicles (OBC, LDC, SMPS, DC LINK CAP), and emerging sectors such as marine, defense, robotics, and data centers.

Differentiator

Problem solved

Functional benefit

Brands

• 프라나 트랜스포머 (Prana Transformer): 회사의 글로벌 독점 핵심 기술인 평판형 트랜스포머로, 기존 코일 구조를 패러다임 혁신하여 2차코일: 권선형에서 평판코일형, 1차코일: PCB 적층코일로 전환. 소형화, 경량화, 저발열, EMI 우수 특성을 보유.

Quantifiable outcome

• Miniaturization and weight reduction achieved through planar coil architecture vs. conventional wound coil transformers
• +3 more outcomes

Named customers4 records

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Three partnerships are on record, tiered core.

• Hyundai Mobis (현대모비스)coreStrategic or Co-development Partner · 1 October 2025ATUM registered as an approved partner supplier with Hyundai Mobis in October 2025, enabling direct supply of EV transformers and power modules (OBC, LDC, SMPS) to one of Korea's largest automotive tier-1 suppliers. This is a strategically significant relationship for ATUM's EV business expansion.
• LG Electronics (LG전자)coreStrategic or Co-development Partner · 1 June 2020Registered as 1st-tier vendor with LG Electronics in June 2020. Supplies multi transformers, PFC transformers, line filters, and DC-DC inverters for LG's premium OLED and QLED television products.
• Samsung Electronics (삼성전자)coreStrategic or Co-development Partner · 1 January 2020Registered as 1st-tier vendor with Samsung Electronics in January 2020 for planar transformer supply. ATUM is the exclusive planar transformer supplier for Samsung's 45W mobile chargers, with 65W development completed and 140W development underway. Also supplies multi transformers, PFC transformers, and line filters for Samsung TVs.

Scale indicators4 records

Recent moves8 records

Expansion highlights6 records

Broad incumbents

• TDK Corporation: Japanese global leader in passive electronic components including inductors, transformers, and power magnetics. TDK's portfolio overlaps directly with ATUM's transformer and power module offerings, though TDK serves a vastly broader customer base across automotive, industrial, and consumer.
• Delta Electronics: Taiwan-based power and thermal management leader with deep presence in EV onboard chargers, DC-DC converters, and SMPS products. Delta is a broad incumbent whose EV power electronics business directly overlaps with ATUM's OBC, LDC, and SMPS roadmap.
• Vishay Intertechnology: Major manufacturer of discrete semiconductors and passive components including inductors and transformers. Vishay's magnetics portfolio for industrial, automotive, and consumer markets positions it as a broad incumbent competitor to ATUM.
• Murata Manufacturing: World's largest MLCC and passive component manufacturer with expanding power magnetics and module offerings. Murata's scale and module integration capabilities make it a broad incumbent that could challenge ATUM in mobile and EV power modules.
• Würth Elektronik: German-based passive component manufacturer with a broad magnetics portfolio including transformers, inductors, and chokes. Würth serves automotive, industrial, and consumer customers globally, making it a broad incumbent comparable to ATUM.
• Eaton Corporation: Global power management company with substantial electrical components and transformer businesses serving industrial, data center, and EV markets. Eaton's scale and breadth make it a broad incumbent reference point for ATUM's expansion ambitions.

Direct peers

• Sumida Corporation: Japan-based specialist in inductors, transformers, and power magnetics for automotive and consumer electronics. Sumida is one of the closest direct peers to ATUM given its focus on custom and specialty transformers for similar end markets including EV power electronics.
• Pulse Electronics (Yageo): Manufacturer of magnetic components including transformers, inductors, and chokes for communications, computing, automotive, and industrial applications. Pulse's planar and high-frequency transformer portfolio is directly comparable to ATUM's Prana Transformer line.
• Bourns Inc. Manufacturer of resistive products, inductive devices, and circuit protection solutions with a strong transformer and inductor portfolio. Bourns serves automotive, industrial, and consumer markets in similar fashion to ATUM, making it a direct peer in magnetics.

Regional players

• Salcomp: Finland/Asia-based mobile charger manufacturer and a key component of ATUM's customer value chain. Salcomp is comparable because it represents the type of power-supply integrator that purchases planar transformers from suppliers like ATUM, and competes indirectly in the same end market.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries1 record

Funding overview

Funding rounds2 records

Investors3 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about ATUM