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. 774-8213
BrandRS PRO
£23.13
Each
Units
- - 12W 1 Encapsulated - - - - 50mm 48mm 40mm - -
RS Stock No. 418-5543
Mfr. Part No.74030
BrandMyrra
£6.26
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. 418-5515
Mfr. Part No.74010
BrandMyrra
£4.22
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. 418-4146
Mfr. Part No.74095
BrandMyrra
£5.15
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. 418-4073
Mfr. Part No.74060
BrandMyrra
£10.74
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. 792-4372
Mfr. Part No.47154
BrandMyrra
£16.29
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
£2.95
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. 418-5559
Mfr. Part No.74040
BrandMyrra
£7.31
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 -
RS Stock No. 418-4089
Mfr. Part No.74070
BrandMyrra
£12.42
Each
Units
10 → 16.5 V ac, 4 → 6.5 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. 418-5470
Mfr. Part No.74000
BrandMyrra
£2.68
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. 509-0979
Mfr. Part No.TCM 230V/12V 3VA
BrandEliwell
£14.52
Each
Units
- - - - - - - - - - - - - -
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. 163-3837
Mfr. Part No.749196500
£5.016
Each (On a Reel of 120)
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. 792-4360
Mfr. Part No.47152
BrandMyrra
£14.66
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. 418-5565
Mfr. Part No.74050
BrandMyrra
£6.29
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. 418-4130
Mfr. Part No.74094
BrandMyrra
£2.86
Each
Units
3.3 → 6V ac 85 → 265V ac 3.1W 1 PCB Mount Flyback 2.1mH 1.5A - 18mm 16mm 17.5mm 18 x 16 x 17.5mm -
RS Stock No. 418-5537
Mfr. Part No.74020
BrandMyrra
£3.88
Each
Units
10 → 17 V ac, 4 → 7 V ac 85 → 265V ac 10 → 16W 2 Through Hole Flyback - 1.4 A, 3 A Pin 21mm 31mm 17mm 21 x 31 x 17mm -
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. 163-3822
Mfr. Part No.749196111
£3.079
Each (On a Reel of 500)
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. 418-5492
Mfr. Part No.74002
BrandMyrra
£3.57
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 -
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