Product Overview

The Power Core of Tomorrow

Providing global customers with high-frequency transformer and inductor solutions ranging from 15W to 5500W.

30 Years of

TDK Expertise

2.85M Units/Month

Powering Advanced Industries

Core Products

High-Power ATQ / EQ Series

Engineered for AI Servers and Cloud Data Centers

Designed for high-density computing applications, this series has been standardized and brought into mass production, enabling compact, low-profile, and highly integrated high-power solutions.

Applications

AI server power supplies, cloud data centers, and high-power industrial power systems

Output Power

550W–5500W

Representative Models

ATQ32 Series: 550W–1000W
ATQ38 Series: 850W–1600W and above
EQ34 / EQD43.8

Core Advantages

High-current capability, low-loss thermal design, and support for automated assembly.

High-Power ATQ / EQ Series

Engineered for AI Servers and Cloud Data Centers

Designed for high-density computing applications, this series has been standardized and brought into mass production, enabling compact, low-profile, and highly integrated high-power solutions.

Applications

AI server power supplies, cloud data centers, and high-power industrial power systems

Output Power

550W–5500W

Representative Models

ATQ32 Series: 550W–1000W
ATQ38 Series: 850W–1600W and above
EQ34 / EQD43.8

Core Advantages

High-current capability, low-loss thermal design, and support for automated assembly.

Model: ATQ3221HP04

Power: 550–750W

Model: ATQ3223HP04

Power: 750–1000W

Model: ATQ3823HP04

Power: 850–1200W

Model: ATQ3828HP04

Power: 1000–1600W

Model: ATQ3828HP07

Power: 1000–1600W

Model: ATQ3221HP09

LLC Icon:

Model: ATQ3223HP09

LLC Icon:

Model: ATQ3823HP09

LLC Icon:

Model: ATQ3828HP09

LLC Icon:

Model: ATQ3221HP06

Power: 550–750W

Model: ATQ3223HP06

Power: 750–1000W

Model: ATQ3823HP06

Power: 850–1200W

Model: ATQ3828HP06

Power: 1000–1600W

Model: ATQ3823HP06X2

Power: 1000–1600W

Model: ATQ3219

PFC Icon:

Model: ATQ3229

PFC Icon:

Model: ATQ3823

PFC Icon:

Model: ATQ3828

PFC Icon:

Model: ATQ3835

PFC Icon:

LLC Transformer Series

A High-Efficiency, Compact Power Solution

Our patented bobbin design features bottom wire-routing points that keep wires away from soldering heat, helping reduce the risk of internal short circuits caused by high temperatures.

Applications

High-end adapters, desktop PC power supplies, and HCTV systems

Power Range / Dimensions

80W–250W: EFD Series, 13.5–23mm height
260W–500W: PQ Series, 30–32mm height

Representative Models

EFD Dual-Slot Series: EFD29.7 / EFD31.4 / EFD34.4 / EFD41.8
PQ / PQM Dual-Slot Series: PQ27 / PQ30 / PQM35 / PQM38

Core Advantages

Tubeless winding design enables fully automated production and supports P44C / P95 high-frequency core materials.

LLC Transformer Series

A High-Efficiency, Compact Power Solution

Our patented bobbin design features bottom wire-routing points that keep wires away from soldering heat, helping reduce the risk of internal short circuits caused by high temperatures.

Applications

High-end adapters, desktop PC power supplies, and HCTV systems

Power Range / Dimensions

80W–250W: EFD Series, 13.5–23mm height
260W–500W: PQ Series, 30–32mm height

Representative Models

EFD Dual-Slot Series: EFD29.7 / EFD31.4 / EFD34.4 / EFD41.8
PQ / PQM Dual-Slot Series: PQ27 / PQ30 / PQM35 / PQM38

Core Advantages

Tubeless winding design enables fully automated production and supports P44C / P95 high-frequency core materials.

Vertical LLC Series

Model: PQ2729

Model: PQ3028

Model: PQM3529P12

Model: PQM3529P08

Model: PQM3830P08

Model: PQM3832P12

Horizontal LLC Series

Model: EEM2527

Model: EFD31.4

Model: EFD29.7

Model: EFD34.4

Model: EFD41.8

Model: EPC34

Flyback Transformer Series

Designed for Slim Laptops and Fast-Charging Adapters

Applications

Gaming laptops, high-performance notebook adapters, and fast-charging modules

Output Power / Frequency

15W–140W
65kHz

Representative Models

CQR19–CQR36 Series Designed to replace conventional RM6–RM10, EF20, and EER28L models

Core Advantages

Fully automated winding across the entire series for consistent product quality
Product height: 17–21mm, adjustable to customer requirements
Available with 7mm and 8mm safety-compliant designs
Uses P95 / P96S high-frequency magnetic core materials

Flyback Transformer Series

Designed for Slim Laptops and Fast-Charging Adapters

Applications

Gaming laptops, high-performance notebook adapters, and fast-charging modules

Output Power / Frequency

15W–140W
65kHz

Representative Models

CQR19–CQR36 Series Designed to replace conventional RM6–RM10, EF20, and EER28L models

Core Advantages

Fully automated winding across the entire series for consistent product quality
Product height: 17–21mm, adjustable to customer requirements
Available with 7mm and 8mm safety-compliant designs
Uses P95 / P96 high-frequency magnetic core materials

FLYBACK CQR Series

Model:CQR19

Core Material:P95

Output Power : 15~20W

Frequency : 65kHz

Model:CQR20

Core Material:P95

Output Power : 20~40W

Frequency : 65kHz

Model:CQR25

Core Material:P95

Output Power : 40~50W

Frequency : 65kHz

Model:CQR26

Core Material:P95

Output Power : 55~65W

Frequency : 65kHz

Model:CQR29

Core Material:P95

Output Power : 55~65W

Frequency : 65kHz

Model:CQR2917

Core Material:P95

Output Power : 65W

Frequency : 65kHz

Model:CQR32.9

Core Material:P95

Output Power : 70~90W

Frequency : 65kHz

Model:CQR36

Core Material:P95

Output Power : 70~90W

Frequency : 65kHz

Other FLYBACK Series

Model:EE14/14

Core Material:P44

Output Power : 20W

Frequency : 65kHz

Model:EE16/15

Core Material:P44

Output Power : 25W

Frequency : 65kHz

Model:ATQ2412

Core Material:P95

Output Power : 50W

Frequency : 65kHz

Model:RM10 ATQ2418

Core Material:P95

Output Power : 65W

Frequency : 65kHz

Model:ATQ2718

Core Material:P95

Output Power : 75W

Frequency : 65kHz

Model:ATQ2723

Core Material:P95

Output Power : 90W

Frequency : 65kHz

Model:ATQ3216

Core Material:P95

Output Power : 120W

Frequency : 65kHz

Model:ATQ3225

Core Material:P95

Output Power : 140W

Frequency : 65kHz

PFC Inductor Series

High-Reliability Design That Helps Prevent Short Circuits at the Structural Level

A deep wire-routing groove positions the incoming wire close to the bobbin’s center opening, reducing the risk of the first winding layer being compressed or damaged by subsequent windings and supporting stable operation under high loads.

Applications

Power factor correction for various switch-mode power supply modules

Output Power

85W–400W

Representative Models

CQ20, CQR23–CQR36, PQM35–PQM41, and ATQ38

Core Advantages

Supports fully automated winding for fine wire specifications below 0.06/400 and 0.1/290. The adhesive process complies with VOC requirements, while laser stripping helps avoid RoHS-related concerns.

PFC Inductor Series

High-Reliability Design That Helps Prevent Short Circuits at the Structural Level

Applications

Power factor correction for various switch-mode power supply modules

Output Power

85W–400W

Representative Models

CQ20, CQR23–CQR36, PQM35–PQM41, and ATQ38

Core Advantages

Supports fully automated winding for fine wire specifications below 0.06/400 and 0.1/290. The adhesive process complies with VOC requirements, while laser stripping helps avoid RoHS-related concerns.

PFC Inductors for TVs

Product Features

Ae range: 85–191
Fully automated winding
Power range: 100W–350W
Product height: 13.5–20mm

Key Advantage
The deep wire-routing groove positions the incoming wire close to the bobbin’s center opening, helping prevent the first winding layer from being compressed or damaged by subsequent windings and reducing the risk of internal short circuits.

PFC Inductors for Adapters

Product Features

Ae range: 60–191
Fully automated winding
Power range: 85W–400W
Product height: 16.2–23mm

Key Advantage
The deep wire-routing groove positions the incoming wire close to the bobbin’s center opening, helping prevent winding damage and reducing the risk of internal short circuits.

EC / EG Series for Home Appliances

Space-Saving Design for Smarter Homes

Applications

Home appliances and smart home control modules

Output Power

12W–83W at 50 kHz

Representative Models

EC20, EC22, EC24, EG24, EG26, and EG28 Designed to replace conventional bulky EI, EED, and EER models

Core Advantages

High-performance P95 / P96S magnetic cores significantly reduce product size at the same power level, supporting lighter and more compact end-product designs.

EC / EG Series for Home Appliances

Space-Saving Design for Smarter Homes

Applications

Home appliances and smart home control modules

Output Power

12W–83W at 50 kHz

Representative Models

EC20, EC22, EC24, EG24, EG26, and EG28 Designed to replace conventional bulky EI, EED, and EER models

Core Advantages

High-performance P95 / P96S magnetic cores significantly reduce product size at the same power level, supporting lighter and more compact end-product designs.

EC / EG Series Model Specifications

Model: EC20

Core Material: P96S
Output Power: 12–26W
Frequency: 50kHz
Replaces: EI22, EE25 (P95)

Model: EC22

Core Material: P96S
Output Power: 25–48W
Frequency: 50kHz
Replaces: EED28, EER28 (P95)

Model: EC24

Core Material: P96S
Output Power: 35–68W
Frequency: 50kHz
Replaces: EER28L (P95)

Model: EG24

Core Material: P95
Output Power: 35–50W
Frequency: 50kHz
Replaces: EER28L (P95)

Model: EG26

Core Material: P95
Output Power: 51–68W
Frequency: 50kHz
Replaces: EER32 (P95)

Model: EG28

Core Material: P95
Output Power: 60–83W
Frequency: 50kHz
Replaces: EER32 (P95)

Custom Development

Can’t find a product that fully meets your project requirements? HENG TAI SHENG INTELLIGENT provides design-driven co-development services, backed by an engineering team with 30 years of TDK-system experience.

Rapid 3D Prototyping

Four in-house 3D engineers can deliver confirmation samples for new transformer designs within one week.

Fast Sample Delivery

Standard samples can be shipped within 3–7 days.

Custom Material Formulation

With our own soft magnetic material sintering facility, we can tailor magnetic material properties from P40 to P96S for specific high-frequency and thermal requirements.

Products