Rotima-Logo
  • About us
  • Areas of application
  • Team
  • Jobs
  • Contact us
  • Downloads
  • Electronic components
    • Our suppliers
    • Resistors
      • Resistor Networks Bourns®
      • Current Sense Resistors Bourns®
      • Power Resistors Bourns®
      • Current Sense / Shunts
        • On-Board
        • Off-Board
      • Chip resistors
      • Trimmer
      • Voltage Dividers Networks
      • Customized resistors
      • Wire resistors
      • Temperature-dependent
      • Power Resistors
    • Inductances
      • Power Inductors
      • Coil Inductors
      • Chip Inductors
      • Transformer & transformer
    • Integrated circuits (IC)
      • All-IN-ONE AC-DC converter
      • GaN AC-DC Power Converter
      • Primary Side Regulation AC-DC Power Converter
      • Non-Isolated AC-DC Power Converter
      • Secondary Side Regulation AC-DC Power Converter
      • Synchronous rectifier
      • Synchronous Rectifier Controller
    • Input / Output elements
      • Membrane keypads
      • Actuators
      • Switches
      • Sound Components
      • Thermistor Heaters
      • Piezoelectric Elements
      • LED related products
      • Transducers
    • Capacitors
      • Electrolytic capacitors
        • Screw terminal electrolytic capacitors
        • Snap-in electrolytic capacitors
        • SMT electrolytic capacitors
        • Radial electrolytic capacitors
        • Polymer electrolytic capacitors
      • Film capacitors
        • High-pulse capacitors
        • Spark killer
        • Interference suppression capacitors
        • Film capacitors from AIC-Europe
      • Ceramic capacitors (MLCC)
      • Tantalum capacitors
        • Radial tantalum capacitors
        • SMT tantalum capacitors
        • Hybrid tantalum capacitors
    • Circuit protection
      • Surge Protective Devices
      • Temperature fuses
      • Overvoltage protection
      • Overcurrent protection
    • Sensors
      • Light sensors
      • Pressure sensors
      • Ultrasonic sensors
      • Humidity sensors
      • Current sensors
      • Potentiometers
      • Encoders
    • Plug connector
      • Power connector
      • Signal connector
    • Transistors
      • insulated-gate bipolar transistor
    • EMC filter
    • Bourns products
      • Ceramic PTC Heaters Bourns®
      • Open LED Shunt (LSP) Bourns®
      • Switches Bourns®
      • Modular Contacts Bourns®
      • Bourns® inductors
      • Custom Magnetics Bourns®
      • Precision Sensors Bourns®
      • Commercial Panel Controls & Encoders Bourns®
      • Industrial Panel Controls Bourns®
      • Pro Audio Products Bourns®
      • Industrie Encoder Bourns®
      • Stock of Bourns® products
      • Turns-Counting Dials Bourns®
      • Circuit protection
        • TBU® High-Speed Protectors Bourns®
        • Mini Breakers Bourns®
        • SinglFuse™ SMD Fuses Bourns®
        • Multifuse® Polymer PTC Resettable Fuses Bourns®
        • Multifuse® Polymer PTC freeXpansion™ Products Bourns®
        • Ceramic PTC Products Bourns®
        • Chipguard® ESD Suppressors Bourns®
        • Gas Discharge Tubes Bourns®
        • GMOV™ Hybrid Overvoltage Protection Components Bourns®
        • TCS™ High-Speed Protectors Bourns®
    • Diodes
      • Diodes Bourns®
      • Diode Arrays Bourns®
      • Power TVS Diodes Bourns®
    • Transducer
      • DC/DC converter
      • Voltage transformer
      • Current transformer
    • Interference suppression filter
      • Radio interference suppression filter
      • Mains interference suppression filter
    • Varistors
      • Multilayer Varistors (MLV) Bourns®
      • Metal Oxide Varistors (MOV) Bourns®
    • Thyristors
      • TISP® Thyristor Surge Protectors Bourns®
    • Potentiometer
      • Commercial Slide Potentiometers Bourns®
      • Precision Controls Bourns®
      • Linear Motion Potentiometers Bourns®
      • Trimpot® Trimming Potentiometers Bourns®
    • Piezo elements
  • Customized inductances
    • Transformers
      • Small transformers
      • Autotransformers
      • Isolating transformers
      • Safety transformers
      • Toroidal transformers
      • UI transformers
      • M transformers
      • EI transformers
      • Planar transformers
    • Throttles
      • Toroidal chokes
      • Storage chokes
    • Coils
      • Air coils
      • Coilformers
      • Baking varnish coils
    • Winding technique
  • Electronics Production equipment
    • Metal mesh
      • Earthing straps
      • Hose braids
      • Power Connections
      • High-performance and special solutions
    • Plugs / plug connections
      • Quick connectors
      • Industrial connectors
    • Strands
      • High frequency strands
      • Fine wires
    • Ferrites
      • Ferrite cores
    • Electrical insulating tapes
      • Glass fabric tape 3M - Types 27-69-79
      • Polyester laminate 3M - Types 44-44DA-44TA-44HT-55
      • Acetate fabric tape 3M - types 11 - 28
      • Epoxy film 3M - Types 1 - Super 10 - Super 20
      • Glass fiber reinforced polyester films 3M - Types 46 - 1039 - 1046 - 1076 - 1139 -1339
      • Electrical insulating tape paper 3M - types 12 - 16
      • Electrical insulating tape polyimide film 3M - Types 92 - 98C-1 - 1205 - 1218
      • Electrical insulating tape PTFE film 3M - types 60 - 61 - 62
      • Electrical insulating tape PVC film 3M - Scotch 22 - Super 33+ - Super 35 - Super 88
      • Electrical insulating tape 3M polyester films
      • Electrically conductive fabric tapes
      • EMC shielding foil made of aluminum
      • EMC shielding foils made of copper
    • Temperature switch
    • Potting compound
    • Impeder cores
    • Nanocrystalline materials
    • Amorphous materials
  • Hose technology
    • Shrink tubing
      • EPDM cold-shrink tubing
      • Shrink tubing, thin-walled
      • Shrink tubing thin-walled crystal clear fluoropolymer RT-375
      • Shrink tubing cut to the desired special size
      • Thick-walled shrink tubing with internal adhesive
      • Shrink tubing thin-walled transparent with inner adhesive
      • Medium-wall shrink tubing with and without internal adhesive
      • Heat-shrinkable shrink molded parts
      • Shrink end cap
      • Thin-walled shrink tubing with internal adhesive
      • Shrink tubing thin-walled inexpensive
      • Heat-shrink tubing, halogen-free, thin-walled
      • Shrink tubing 3:1 thin-walled
      • Shrink tubing thin-walled yellow/green
      • Shrink tubing thin-walled fluoroelastomer VITON-E
      • Heat-shrink tubing super-thin rigid PVC Kopalon for battery packs
      • Shrink tubing thin-walled PVDF Kynar
    • Silicone hoses
      • Silicone hose industry
      • Silicone tube Pharma
      • MedTech silicone tubing
      • Silicone round cord and monofilament
      • Silicone fabric hose - pressure hose
      • Silicone shrink tubing
    • Protective hoses
      • Braided hose
      • Fabric shrink tubing
      • Insulating hose made of polyamide 12
      • PA 12 Hose
    • Fluoroplastic hose
      • FEP hose
      • FEP heat shrink tubing 2:1
      • FEP shrink tubing 1.3:1 and 1.6:1
      • FEP heat shrink tubing 110°C
      • FEP roller coating with shrinkage
      • FEP/EFEP double-wall shrink tubing
      • PFA hose
      • PTFE hose
      • PTFE heat shrink tubing 2:1
      • PTFE shrink tubing 4:1
      • PTFE heat-shrink tubing Sub-Lite-Wall
      • PTFE-FEP double-wall shrink tubing
    • Special hoses
      • Special hoses PEEK
      • Polyimide hose
      • PEEK shrink tubing
    • Further hose technology
      • PTFE shrink tubing
      • Chemical hoses
      • Industrial hoses
      • Food hoses
Added value distributor and development

Planar transformers

Our official sales partner: Dongke Semiconductor

Your browser does not support the video tag.
Dongke is a leading manufacturer of high-frequency and high-efficiency power supply ICs, synchronous rectifiers and innovative solutions for power electronics.
Through this partnership, we can offer our customers access to a wide range of state-of-the-art technologies and products - from synchronous rectifiers for efficient energy conversion to customized solutions for industrial applications and consumer electronics.

Planar transformers for high-frequency applications

Planar transformers are innovative, energy-efficient transformer solutions for power transmission in modern electronic systems. In contrast to conventional transformers, they use flat, planar windings that are integrated into printed circuit boards. This enables a compact design with high power density and improved thermal management.

Due to their low height and efficient heat dissipation, planar transformers are particularly suitable for applications where space and energy efficiency are crucial. Typical applications include power electronics, renewable energy systems, electric vehicles and telecommunications equipment.

Rotima AG, in cooperation with Dongke Semiconductor, offers a wide range of planar transformers as well as miniature transformers for electronics that meet the latest industry standards and are optimized for a variety of applications. Our experienced engineering team with over 20 years of expertise ensures that our products meet the highest quality and performance requirements.

Discover the advantages of planar transformers for your projects and benefit from our many years of experience and our commitment to innovative solutions.

Planar transformers in the electronics industry

Buy planar transformer ICs

  • Compact and space-saving
  • Efficient heat dissipation
  • Versatile in use
  • Quality through strong partnership

Product features

Product model:
Core type:EE
Core material:HE7
Rotation ratio (Np/Ns):28T/4
Vcc winding:88
Inductance:3535
MAX operating frequency:250KHz
Topology:High-frequency DCM, CCM, QR-mode flyback and multi-mode flyback (recommended application topologies)

Electrical properties

ItemMeasuring pageStandardTest conditions
InductanceHV-SW340uH-360uH100KHz/0.25V
Stray inductanceHV-SW6uH MAX100KHz/0.25V, whereby the other windings are short-circuited
DC resistorHV-SW1250mΩ MAX/
VC-PG1350mΩ MAX/
A-B25mΩ MAX/
Winding ratioturns ratio28T:4T:8T/
Resistance to stresses(HV+SW):(A+B)No failure, flying arc3750Vac 1mA 3S
(VC+PG):(A+B)No failure, flying arc3750Vac 1mA 3S
(HV+SW):(VC+PG)No failure, flying arc1000Vac 1mA 3S
Toroidal transformers for efficiency and performance

Download data sheet

Here you will find our current Planar Transformers data sheet PDF, which provides you with detailed information on the technical specifications and possible applications of our planar transformers.
DK-EQ20-PD30W-T-V0.7-Planar-Transformer51.pdf

Materials and structure of planar transformers

Planar transformers consist of flat, planar windings that are precisely integrated into printed circuit boards. This design enables a compact and efficient structure. The windings are usually made of copper layers, which are separated from each other by thin layers of insulation. The magnetic core, usually made of ferrite material, surrounds the windings and concentrates the magnetic field, ensuring low-loss energy transmission.

Thanks to their special design, planar transformers offer excellent heat dissipation and reduce electrical losses. These properties make them the ideal solution for space-saving and high-performance applications in the electronics industry, for example in power electronics and other energy-intensive applications. Rotima AG and Dongke Semiconductor supply customized planar transformers that are optimally adapted to industrial requirements.
Do you have any questions about our offer?
Planar transformers
Request a callback
Direct inquiry

Advantages of planar transformers in power electronics

Planar transformers are used in numerous high-tech areas where compact design and energy efficiency are crucial. In power electronics, they are used in switching power supplies and inverters, where they enable reliable energy transmission and efficient heat dissipation.

In the automotive industry, they are used in electric and hybrid vehicles, for example in on-board chargers, in order to control the energy flow optimally. They also ensure a stable power supply with high power density in telecommunications devices such as base stations and network equipment.

Thanks to their versatility and efficiency, planar transformers are a forward-looking solution for modern electronic systems. Rotima AG and Dongke Semiconductor offer innovative products for these demanding applications.
What can we do for you?
Contact our product experts
Tobias Nuffer
Tobias Nuffer
Managing Director & Key Accounting DE
+49 8341 93403 20
[email protected]
Direct inquiry
Request a callback
What can we do for you?
Contact our product experts
Roland Jungen
Roland Jungen
Key Account Manager CH
+41 44 927 26 24
[email protected]
Direct inquiry
Request a callback

Do you have any questions about:

Planar transformers

Just send us a short message and we will be happy to answer your questions by phone or e-mail.
Request now
Questions?
Write to us!

Would you like to find out more about our high-quality products?

We have a large warehouse, short delivery times and duty-free delivery!

Do not hesitate to contact us, we will be happy toadvise you personally.
Your contact persons
Request a callback

Would you like a personal telephone consultation?

Simply fill out the form and we will get back to you.
Request a callback now

What are the advantages of using DC voltage transformers compared to AC voltage transformers?

Please fill out the form below to download the data sheet for this product.
Fields marked with * are mandatory fields
Send

What are the advantages of using DC voltage transformers compared to AC voltage transformers?

You can now click and download the PDF documents as usual.
X

Get in touch with us

Further information on plan transformers

Planar transformers are innovative, compact and energy-efficient transformers that are an ideal solution for modern electronic applications thanks to their flat design and high power density.

What are the advantages of planar transformers over conventional transformers?

Planar transformers offer a compact design, improved heat dissipation, lower electrical losses and higher power density, making them ideal for modern electronic applications.
Learn more

How does heat dissipation work with planar transformers?

Thanks to the flat windings and tight integration into the PCB, heat is efficiently dissipated to the environment, preventing thermal overloads.
Learn more

What materials are used for planar transformers?

Planar transformers consist of copper layers for the windings, thin insulation layers and a ferrite core that concentrates the magnetic field and minimizes losses.
Learn more

Where are planar transformers used in power electronics?

They are used in switching power supplies, inverters and other high-frequency power supplies where compact design and energy efficiency are crucial.
Learn more

Why are planar transformers particularly suitable for electric vehicles?

Their low height, high power density and effective heat dissipation make them ideal for on-board chargers and other current-carrying systems in electric and hybrid vehicles.
Learn more

Planar transformers in Germany and Switzerland?

Where can I buy efficient planar transformers? - Rotima GmbH offers high-quality planar transformers that are specially designed for efficiency and durability. You can purchase these directly from us - both in Germany and in Switzerland.

Does Rotima offer transformer components for Switzerland? - Yes, we also supply customers in Switzerland with planar transformers and corresponding components that meet the highest quality standards.

What distinguishes your planar transformers in Germany? - Our planar transformers in Germany are characterized by state-of-the-art technology, high energy efficiency and compact design - perfect for a wide range of applications.
Learn more

Industry solutions for planar transformers?

What industrial transformer solutions does Rotima offer? - We offer transformer solutions that have been specially developed for industrial applications - reliable, robust and efficient.

Do you offer transformers for medical technology?
- Yes, our planar transformers are ideal for medical technology and meet the highest requirements in terms of safety and precision.

Are there transformers for renewable energies? - Our planar transformers for renewable energies are ideally suited to applications such as solar and wind power systems and support a sustainable energy future.

Do you offer solutions for smart home systems? - Yes, our planar transformers are an excellent choice for use in smart home systems and ensure efficient energy transmission in modern households.
Learn more
YOUR WAY TO US IN SWITZERLAND:
Switzerland
© ROTIMA AG
Industriestrasse 14 · CH-8712 Stäfa
YOUR WAY TO US IN GERMANY:
Germany
© Rotima GmbH
Innovapark 20 · 87600 Kaufbeuren
Change your consent
  • Sitemap
  • Legal Notice
  • Data protection
  • GTC
ROTIMA Marketing Cellphone Kontakt
We are looking forward
to your call!
Switzerland
+41 44 927 26 26
[email protected]
Germany
+49 8341 9340320
[email protected]
Each application is
individual
Switzerland
+41 44 927 26 26
[email protected]
Germany
+49 8341 9340320
[email protected]
Make a request
Request a callback