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. 522-6134
Mfr. Part No.749196500
£7.14
Each
Units
- - - 3 Surface Mount Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 87.1µH 1.91A - 29.5mm 21mm 10.8mm 29.5 x 21 x 10.8mm 500V dc
RS Stock No. 522-5989
Mfr. Part No.749196111
£3.96
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. 823-5447
Mfr. Part No.760895731
£16.92
Each
Units
12V - 250W 1 Through Hole - - 5A - 48mm 46mm 27.5mm 48 x 46 x 27.5mm 250V
RS Stock No. 163-5621
Mfr. Part No.760895731
£15.386
Each (In a Tray of 15)
Units
12V - 250W 1 Through Hole - 475µH 5A - 48mm 46mm 27.5mm 48 x 46 x 27.5mm 250V
RS Stock No. 823-5459
Mfr. Part No.760895751
£17.15
Each
Units
48V - 250W 1 Through Hole - - 4.3A - 48mm 46mm 27.5mm 48 x 46 x 27.5mm 250V
RS Stock No. 522-5973
Mfr. Part No.749196101
£3.96
Each
Units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 198.6µH 550mA - 12.9mm 9.2mm 6.2mm 12.9 x 9.2 x 6.2mm 500V dc
RS Stock No. 163-5623
Mfr. Part No.760895751
£15.208
Each (In a Tray of 15)
Units
48V - 250W 1 Through Hole - 400µH 4.3A - 48mm 46mm 27.5mm 48 x 46 x 27.5mm 250V
RS Stock No. 522-6033
Mfr. Part No.749196201
£4.54
Each
Units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 140µH 950mA - 16.3mm 12mm 7.4mm 16.3 x 12 x 7.4mm 500V dc
RS Stock No. 816-4953
Mfr. Part No.760301306
£5.59
Each
Units
80V ac 250V ac - 1 Surface Mount Flyback 1.8mH - Solder 10.5mm 10.5mm 11mm 10.5 x 10.5 x 11mm 1500 V dc, 2500 V ac
RS Stock No. 522-6049
Mfr. Part No.749196211
£4.54
Each
Units
- - - 3 Surface Mount Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 21.6µH 950mA - 16.3mm 12mm 7.4mm 16.3 x 12 x 7.4mm 500V dc
RS Stock No. 823-5434
Mfr. Part No.760895441
£13.32
Each
Units
24V - 150W 1 Through Hole - - 2A - 36mm 36mm 26mm 36 x 36 x 26mm 250V
RS Stock No. 162-1317
Mfr. Part No.760895441
£12.11
Each (In a Tray of 20)
Units
24V - 150W 1 Through Hole - 600µH 2A - 36mm 36mm 26mm 36 x 36 x 26mm 250V
RS Stock No. 823-5440
Mfr. Part No.760895641
£14.30
Each
Units
24 V - 200W 1 Through Hole - - 3.5A - 44mm 43mm 30mm 44 x 43 x 30mm 250V
RS Stock No. 163-5620
Mfr. Part No.760895641
£13.00
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. 823-5425
Mfr. Part No.760895431
£13.32
Each
Units
12V - 150W 1 Through Hole - - 2A - 36mm 36mm 26mm 36 x 36 x 26mm 250V
RS Stock No. 823-5437
Mfr. Part No.760895451
£13.32
Each
Units
48V - 150W 1 Through Hole - - 2A - 36mm 36mm 26mm 36 x 36 x 26mm 250V
RS Stock No. 162-1314
Mfr. Part No.760895651
£12.60
Each (In a Tray of 15)
Units
48V - 200W 1 Through Hole - 500µH 3.5A - 44mm 43mm 30mm 44 x 43 x 30mm 250V
RS Stock No. 162-1318
Mfr. Part No.760895451
£12.11
Each (In a Tray of 20)
Units
48V - 150W 1 Through Hole - 600µH 2A - 36mm 36mm 26mm 36 x 36 x 26mm 250V
RS Stock No. 823-5443
Mfr. Part No.760895651
£13.86
Each
Units
48V - 200W 1 Through Hole - - 3.5A - 44mm 43mm 30mm 44 x 43 x 30mm 250V
RS Stock No. 163-5619
Mfr. Part No.760895431
£12.11
Each (In a Tray of 20)
Units
12V - 150W 1 Through Hole - 600µH 2A - 36mm 36mm 26mm 36 x 36 x 26mm 250V