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. 106-8841
Mfr. Part No.78601/9C
£1.142
Each (In a Tube of 50)
Units
- - - 1 Through Hole Filtering 10mH - Pin 9.52mm - - 9.52 x 9 x 6.35mm 1kV
RS Stock No. 162-1312
Mfr. Part No.760895631
£12.60
Each (In a Tray of 20)
Units
12V - 200W 1 Through Hole - 500µH 3.5A - 44mm 43mm 30mm 44 x 43 x 30mm 250V
RS Stock No. 792-4439
Mfr. Part No.47255
BrandMyrra
£16.05
Each
Units
15V dc 85 → 265 V ac, 85 → 370 V dc 5W 2 Through Hole - - - - 31.7mm 26.7mm 21.8mm 31.7 x 26.7 x 21.8mm -
RS Stock No. 163-3834
Mfr. Part No.749196311
£3.117
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. 823-5431
Mfr. Part No.760895631
£13.86
Each
Units
12V - 200W 1 Through Hole - - 3.5A - 44mm 43mm 30mm 44 x 43 x 30mm 250V
RS Stock No. 522-6099
Mfr. Part No.749196311
£5.58
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. 522-6207
Mfr. Part No.749196511
£6.68
Each
Units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 22.3µH 1.7A - 21mm 21mm 10.8mm 21 x 21 x 10.8mm 500V dc
RS Stock No. 715-6961
Mfr. Part No.78601/9C
£1.19
Each
Units
- - - 2 Through Hole Filtering 10mH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 792-4388
Mfr. Part No.47114
BrandMyrra
£7.57
Each
Units
12V dc 85 → 265 V ac, 85 → 370 V dc 2.4W 1 Through Hole - - - - 31.7mm 26.7mm 21.8mm 31.7 x 26.7 x 21.8mm -
RS Stock No. 715-6958
Mfr. Part No.78601/3C
£1.19
Each
Units
- - - 1 Through Hole Filtering 200µH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 816-4950
Mfr. Part No.760301305
£5.75
Each
Units
80V ac 250V - 1 Surface Mount Flyback 735µH - Solder 10.5mm 10.5mm 11mm 10.5 x 10.5 x 11mm 1500 V dc, 2500 V ac
RS Stock No. 106-8830
Mfr. Part No.78601/3C
£1.142
Each (In a Tube of 50)
Units
- - - 1 Through Hole Filtering 200µH - Pin 9.52mm - - 9.52 x 9 x 6.35mm 1kV
RS Stock No. 522-6140
Mfr. Part No.749196510
£7.61
Each
Units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 9.9µH 1.91A - 21mm 21mm 10.8mm 21 x 21 x 10.8mm 500V dc
RS Stock No. 522-6055
Mfr. Part No.749196221
£2.32
Each
Units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 11.6µH 950mA - 16.3mm 12mm 7.4mm 16.3 x 12 x 7.4mm 500V dc
RS Stock No. 106-8583
Mfr. Part No.78602/8C
£1.142
Each (In a Tube of 50)
Units
- - - 2 Through Hole Filtering 1mH - Pin 9.52mm - - 9.52 x 9 x 6.35mm 1kV
RS Stock No. 792-4354
Mfr. Part No.47125
BrandMyrra
£14.55
Each
Units
15V dc 85 → 265 V ac, 85 → 370 V dc 2.5W 1 Through Hole - - - - 31.7mm 26.7mm 21.8mm 31.7 x 26.7 x 21.8mm -
RS Stock No. 106-8800
Mfr. Part No.78615/1C
£1.142
Each (In a Tube of 50)
Units
- - - 2 Through Hole Filtering 2mH - Pin 9.52mm - - 9.52 x 9 x 6.35mm 1kV
RS Stock No. 792-4417
Mfr. Part No.47244
BrandMyrra
£8.72
Each
Units
7 V dc, 15 V dc 85 → 265 V ac, 85 → 370 V dc 4W 2 Through Hole - - - - 31.7mm 26.7mm 21.8mm 31.7 x 26.7 x 21.8mm -
RS Stock No. 792-4382
Mfr. Part No.47132
BrandMyrra
£7.57
Each
Units
5V dc 85 → 265 V ac, 85 → 370 V dc 2.5W 1 Through Hole - - - - 31.7mm 26.7mm 21.8mm 31.7 x 26.7 x 21.8mm -
RS Stock No. 715-7009
Mfr. Part No.78615/1C
£1.19
Each
Units
- - - 2 Through Hole Filtering 2mH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV