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. 823-5437
Mfr. Part No.760895451
MYR72.07
Each
units
48V - 150W 1 Through Hole - - 2A - 36mm 36mm 26mm 36 x 36 x 26mm 250V
RS Stock No. 823-5447
Mfr. Part No.760895731
MYR93.44
Each
units
12V - 250W 1 Through Hole - - 5A - 48mm 46mm 27.5mm 48 x 46 x 27.5mm 250V
RS Stock No. 816-4941
Mfr. Part No.760301304
MYR32.22
Each
units
80V ac 250V - 1 Surface Mount Flyback 1.08mH - Solder 10.5mm 10.5mm 11mm 10.5 x 10.5 x 11mm 1500 V dc, 2500 V ac
RS Stock No. 522-6005
Mfr. Part No.749196131
MYR27.49
Each
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 10.9µH 550mA - 12.9mm 9.2mm 6.2mm 12.9 x 9.2 x 6.2mm 500V dc
RS Stock No. 816-4950
Mfr. Part No.760301305
MYR32.22
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. 792-4388
Mfr. Part No.47114
BrandMyrra
MYR63.95
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. 418-5492
Mfr. Part No.74002
BrandMyrra
MYR20.18
Each
units
9 → 18V ac 85 → 265V ac 4.5 → 6W 1 Through Hole Flyback - 500mA Pin 18mm 17.5mm 16mm 18 x 17.5 x 16mm -
RS Stock No. 792-4357
Mfr. Part No.47123
BrandMyrra
MYR58.64
Each
units
9V 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. 162-0296
Mfr. Part No.B82802A0055A225
BrandEPCOS
MYR21.52
Each (On a Reel of 80)
units
5 (Output 2) V, 12 (Output 1) V 30 → 60V ac 55W 2 Surface Mount DC to DC Converter, Flyback, Power Over Ethernet, Power Sourcing Equipment, Powered Devices 22µH - Gullwing 32.6mm - - 32.6 x 27 x 14.8mm 1.5kV ac
RS Stock No. 162-1314
Mfr. Part No.760895651
MYR74.172
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. 792-4423
Mfr. Part No.47247
BrandMyrra
MYR61.79
Each
units
-15 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. 792-4344
Mfr. Part No.47121
BrandMyrra
MYR41.56
Each
units
3.3V 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. 871-1666
Mfr. Part No.B82802A0055A225
BrandEPCOS
MYR27.06
Each
units
5 (Output 2) V, 12 (Output 1) V 30 → 60V ac 55W 2 Surface Mount DC to DC Converter, Flyback, Power Over Ethernet, Power Sourcing Equipment, Powered Devices 22µH - Gullwing 32.6mm - - 32.6 x 27 x 14.8mm 1500V ac
RS Stock No. 792-4436
Mfr. Part No.47254
BrandMyrra
MYR69.31
Each
units
12V 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. 163-5619
Mfr. Part No.760895431
MYR69.048
Each (In a Tray of 20)
units
12V - 150W 1 Through Hole - 600µH 2A - 36mm 36mm 26mm 36 x 36 x 26mm 250V
RS Stock No. 823-5443
Mfr. Part No.760895651
MYR68.65
Each
units
48V - 200W 1 Through Hole - - 3.5A - 44mm 43mm 30mm 44 x 43 x 30mm 250V
RS Stock No. 823-5425
Mfr. Part No.760895431
MYR72.07
Each
units
12V - 150W 1 Through Hole - - 2A - 36mm 36mm 26mm 36 x 36 x 26mm 250V
RS Stock No. 418-4089
Mfr. Part No.74070
BrandMyrra
MYR78.32
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. 106-8858
Mfr. Part No.78601/16C
MYR6.573
Each (In a Tube of 50)
units
- - - 1 Through Hole Filtering 4mH - Pin 9.52mm - - 9.52 x 9 x 6.35mm 1kV
RS Stock No. 792-4411
Mfr. Part No.47245
BrandMyrra
MYR51.87
Each
units
5.5 V dc, 12 V dc 85 → 265 V ac, 85 → 370 V dc 3.2W 2 Through Hole - - - - 31.7mm 26.7mm 21.8mm 31.7 x 26.7 x 21.8mm -