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
SGD44.87
Each
units
- - 12W 1 Encapsulated - - - - 50mm 48mm 40mm - -
RS Stock No. 418-5543
Mfr. Part No.74030
BrandMyrra
SGD12.54
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. 841-6765
Mfr. Part No.B78304B1031A003
BrandEPCOS
SGD11.13
Each
units
- - - 1 Surface Mount Pulse Transformers, Broadband Transformers, Drive Transformers for Power Semiconductors, Low-power DC/DC Converters 1µH - Gullwing 8mm 7mm 5.4mm 8 x 7 x 5.4mm -
RS Stock No. 162-0281
Mfr. Part No.B78304B1031A003
BrandEPCOS
SGD5.555
Each (On a Reel of 900)
units
- - - 1 Surface Mount Broadband Transformers, Drive Transformers for Power Semiconductors, Low-power DC/DC Converters, Pulse Transformers 1µH - Gullwing 8mm 7mm 5.4mm 8 x 7 x 5.4mm -
RS Stock No. 418-5492
Mfr. Part No.74002
BrandMyrra
SGD7.12
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. 418-5486
Mfr. Part No.74001
BrandMyrra
SGD5.89
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. 418-5537
Mfr. Part No.74020
BrandMyrra
SGD7.75
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. 418-4130
Mfr. Part No.74094
BrandMyrra
SGD6.94
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. 170-9243
Mfr. Part No.78615/3C
SGD2.26
Each (On a Reel of 50)
units
- - - 2 Through Hole Filtering 200µH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 715-6999
Mfr. Part No.78615/3C
SGD2.37
Each
units
- - - 2 Through Hole Filtering 200µH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 418-5470
Mfr. Part No.74000
BrandMyrra
SGD5.35
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. 522-6134
Mfr. Part No.749196500
SGD14.31
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. 792-4411
Mfr. Part No.47245
BrandMyrra
SGD16.07
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 -
RS Stock No. 418-5559
Mfr. Part No.74040
BrandMyrra
SGD14.65
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. 792-4372
Mfr. Part No.47154
BrandMyrra
SGD32.52
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. 792-4348
Mfr. Part No.47122
BrandMyrra
SGD32.01
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
SGD2.37
Each
units
- - - 2 Through Hole Filtering 2mH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 106-8800
Mfr. Part No.78615/1C
SGD2.26
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. 522-6005
Mfr. Part No.749196131
SGD6.65
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. 715-6949
Mfr. Part No.78601/4C
SGD2.37
Each
units
- - - 1 Through Hole Filtering 100µH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
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