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. 715-6986
Mfr. Part No.78602/2C
R 30.59
Each
units
- - - 2 Through Hole Filtering 500µH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS stock no. 106-8582
Mfr. Part No.78602/2C
R 27.439
Each (In a Tube of 50)
units
- - - 2 Through Hole Filtering 500µH - Pin 9.52mm - - 9.52 x 9 x 6.35mm 1kV
RS stock no. 792-4372
Mfr. Part No.47154
BrandMyrra
R 365.62
Each
units
12V dc 85 → 265 V ac, 85 → 370 V dc 5W 1 Through Hole - - - - 31.7mm 26.7mm 21.8mm 31.7 x 26.7 x 21.8mm -
RS stock no. 418-5565
Mfr. Part No.74050
BrandMyrra
R 158.18
Each
units
3.3 → 6.5 V ac, 9 → 16.5 V ac 85 → 265V ac 60 → 80W 4 PCB Mount Flyback 500µH 1.5 A, 3 A, 5 A - 43mm 40mm 34mm 43 x 40 x 34mm -
RS stock no. 792-4401
Mfr. Part No.47164
BrandMyrra
R 315.28
Each
units
12V dc 85 → 265 V ac, 85 → 370 V dc 5W 1 Through Hole - - - - 31.7mm 26.7mm 21.8mm 31.7 x 26.7 x 21.8mm -
RS stock no. 418-5486
Mfr. Part No.74001
BrandMyrra
R 69.91
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. 418-4089
Mfr. Part No.74070
BrandMyrra
R 314.86
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. 774-8213
BrandRS PRO
R 520.60
Each
units
- - 12W 1 Encapsulated - - - - 50mm 48mm 40mm - -
RS stock no. 177-7112
Mfr. Part No.TGM-240NSRL
R 55.235
Each (In a Tube of 62)
units
- - - 2 Surface Mount - - - - 8.13mm 7.11mm 5.08mm 8.13 x 7.11 x 5.08mm -
RS stock no. 736-9987
Mfr. Part No.TGM-240NSRL
R 97.07
Each
units
- - - 2 Surface Mount - - - - 8.13mm 7.11mm 5.08mm 8.13 x 7.11 x 5.08mm -
RS stock no. 792-4360
Mfr. Part No.47152
BrandMyrra
R 329.45
Each
units
5V dc 85 → 265 V ac, 85 → 370 V dc 5W 1 Through Hole - - - - 31.7mm 26.7mm 21.8mm 31.7 x 26.7 x 21.8mm -
RS stock no. 792-4376
Mfr. Part No.47155
BrandMyrra
R 324.95
Each
units
15V dc 85 → 265 V ac, 85 → 370 V dc 5W 1 Through Hole - - - - 31.7mm 26.7mm 21.8mm 31.7 x 26.7 x 21.8mm -
RS stock no. 171-1196
Mfr. Part No.B82802A0012A315
BrandEPCOS
R 26.069
Each (On a Reel of 300)
units
3.3 (Output 2) V, 5 (Output 1) V, 12 (Output 3) V 36 → 60V dc 12W 3 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. 871-1650
Mfr. Part No.B82802A0012A315
BrandEPCOS
R 26.83
Each
units
3.3 (Output 2) V, 5 (Output 1) V, 12 (Output 3) V 36 → 60V dc 12W 3 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. 792-4414
Mfr. Part No.47243
BrandMyrra
R 199.54
Each
units
7 V dc, 10.5 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. 418-4073
Mfr. Part No.74060
BrandMyrra
R 268.23
Each
units
3.3 → 6.5 V ac, 9 → 16.5 V ac 85 → 265V ac 70 → 120W 4 PCB Mount Flyback 440µH 3 A, 4 A, 5 A - 49mm 46mm 38mm 49 x 46 x 38mm -
RS stock no. 792-4433
Mfr. Part No.47257
BrandMyrra
R 376.62
Each
units
5 V dc, 12 V 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. 162-0295
Mfr. Part No.B82802A0055A325
BrandEPCOS
R 53.188
Each (On a Reel of 80)
units
3.3 (Output 2) V, 5 (Output 1) V, 12 (Output 3) V 36 → 60V dc 55W 3 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. 522-6083
Mfr. Part No.749196301
R 123.49
Each
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 153.8µH 970mA - 17.5mm 16mm 8.3mm 17.5 x 16 x 8.3mm 500V dc
RS stock no. 418-5559
Mfr. Part No.74040
BrandMyrra
R 176.73
Each
units
3.3 → 7 V ac, 8 → 16.5 V ac 85 → 265V ac 35 → 40W 4 PCB Mount Flyback 500µH 1.5 A, 4 A - 37mm 37mm 27mm 37 x 37 x 27mm -