Switch Mode Power Supply (SMPS) Transformers

Switch mode power supply (SMPS) transformers are a highly efficient form of transformer, used in devices like personal computers.

A switch mode power supply is an electronic power supply that incorporates a switching regulator to efficiently convert electrical power. Like other power supplies, an SMPS transfers power from a DC or AC source (which is often mains power) to DC loads, such as a personal computer, while converting voltage and current characteristics.

How do switch mode power supply (SMPS) transformers work?

Any switched-mode power supply that gets its power from an AC power line (also known as an 'off-line' converter) requires a transformer for galvanic isolation, which prevents current flow. Some DC-to-DC converters may also include a transformer.

SMPS transformers run at high frequency. Most of the cost savings (as well as space savings) in off-line power supplies result from the smaller size of the high-frequency transformer.

Types of switch mode power supply (SMPS) transformers

SMPS transformers have many different applications. They can be used as broadband transformers, DC-to-DC converters, low-power DC-to-DC converters, pulse transformers and power sourcing equipment, among other uses.


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Description Price Secondary Voltage Rating Primary Voltage Rating Power Rating Number of Outputs Mounting Type Application Inductance Secondary Current Termination Type Length Width Depth Dimensions Isolation Voltage
RS Stock No. 418-5543
Mfr. Part No.74030
BrandMyrra
TWD278.00
Each
units
3.3 → 7 V ac, 8 → 17 V ac 85 → 265V ac 15 → 30W 3 Through Hole Flyback - 1.5 A, 3 A Pin 26.5mm 22.5mm 26.5mm 26.5 x 22.5 x 26.5 mmmm -
RS Stock No. 715-6939
Mfr. Part No.77204C
TWD236.00
Each
units
- - - - Through Hole TRIAC Firing - - Pin 25.4mm 20.3mm 12.3mm 25.4 x 20.3 x 12.3mm -
RS Stock No. 106-8824
Mfr. Part No.77204C
TWD228.20
Each (In a Tube of 25)
units
- - - - Through Hole TRIAC Firing - - Pin 25.4mm - - 25.4 x 20.3 x 12.3mm -
RS Stock No. 418-5470
Mfr. Part No.74000
BrandMyrra
TWD137.00
Each
units
3.3 → 7 V dc, 8 → 17 V dc 85 → 265V ac 4W 2 Through Hole Flyback - 1.2 A, 350 mA Pin 18mm 17.5mm 16mm 18 x 17.5 x 16mm -
RS Stock No. 522-6099
Mfr. Part No.749196311
TWD249.00
Each
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 23.3µH 970mA - 17.5mm 16mm 8.3mm 17.5 x 16 x 8.3mm 500V dc
RS Stock No. 163-3834
Mfr. Part No.749196311
TWD124.50
Each (On a Reel of 300)
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 23.3µH 970mA - 17.5mm 16mm 8.3mm 17.5 x 16 x 8.3mm 500V dc
RS Stock No. 418-5486
Mfr. Part No.74001
BrandMyrra
TWD110.00
Each
units
3.3 → 6V ac 85 → 265V ac 4.5 → 6W 1 Through Hole Flyback - 1.2A Pin 18mm 17.5mm 16mm 18 x 17.5 x 16mm -
RS Stock No. 522-5995
Mfr. Part No.749196121
TWD175.00
Each
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 14.7µH 550mA - 12.9mm 9.2mm 6.2mm 12.9 x 9.2 x 6.2mm 500V dc
RS Stock No. 823-5440
Mfr. Part No.760895641
TWD600.00
Each
units
24 V - 200W 1 Through Hole - - 3.5A - 44mm 43mm 30mm 44 x 43 x 30mm 250V
RS Stock No. 418-5515
Mfr. Part No.74010
BrandMyrra
TWD168.00
Each
units
4 → 7 V ac, 8 → 17 V ac 85 → 265V ac 7 → 10W 2 Through Hole Flyback - 2 A, 850 mA Pin 18mm 17.5mm 16mm 18 x 17.5 x 16mm -
RS Stock No. 163-5620
Mfr. Part No.760895641
TWD574.50
Each (In a Tray of 15)
units
24V - 200W 1 Through Hole - 500µH 3.5A - 44mm 43mm 30mm 44 x 43 x 30mm 250V
RS Stock No. 418-4146
Mfr. Part No.74095
BrandMyrra
TWD146.00
Each
units
7.5 → 15V ac 85 → 265V ac 4.2W 1 PCB Mount Flyback 2.1mH 900mA - 18mm 16mm 17.5mm 18 x 16 x 17.5mm -
RS Stock No. 418-4089
Mfr. Part No.74070
BrandMyrra
TWD545.00
Each
units
4 → 6.5 V ac, 10 → 16.5 V ac 85 → 265V ac 120 → 160W 4 PCB Mount Flyback 300µH 5 A, 6 A - 52mm 51mm 40.5mm 52 x 51 x 40.5mm -
RS Stock No. 871-1657
Mfr. Part No.B82802A0012A215
BrandEPCOS
TWD136.00
Each
units
5 (Output 2) V, 12 (Output 1) V 36 → 60V dc 12W 2 Surface Mount DC to DC Converter, Flyback, Power Over Ethernet, Power Sourcing Equipment, Powered Devices 100µH - Gullwing 22.3mm - - 22.3 x 16.5 x 8.65mm 1500V ac
RS Stock No. 162-0231
Mfr. Part No.B82802A0012A215
BrandEPCOS
TWD77.00
Each (On a Reel of 300)
units
5 (Output 2) V, 12 (Output 1) V 36 → 60V dc 12W 2 Surface Mount DC to DC Converter, Flyback, Power Over Ethernet, Power Sourcing Equipment, Powered Devices 100µH - Gullwing 22.3mm - - 22.3 x 16.5 x 8.65mm 1.5kV ac
RS Stock No. 522-5989
Mfr. Part No.749196111
TWD179.00
Each
units
- - - 3 Surface Mount Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 27.4µH 550mA - 12.9mm 9.2mm 6.2mm 12.9 x 9.2 x 6.2mm 500V dc
RS Stock No. 715-7005
Mfr. Part No.78615/8C
TWD53.00
Each
units
- - - 2 Through Hole Filtering 1mH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 106-8814
Mfr. Part No.78615/9C
TWD50.90
Each (In a Tube of 50)
units
- - - 2 Through Hole Filtering 10mH - Pin 9.52mm - - 9.52 x 9 x 6.35mm 1kV
RS Stock No. 522-6190
Mfr. Part No.749196501
TWD355.00
Each
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 196µH 1.7A - 21mm 21mm 10.8mm 21 x 21 x 10.8mm 500V dc
RS Stock No. 715-6942
Mfr. Part No.77208C
TWD236.00
Each
units
- - - - Through Hole TRIAC Firing - - Pin 25.4mm 20.3mm 12.3mm 25.4 x 20.3 x 12.3mm -