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. 418-5509
Mfr. Part No.74003
BrandMyrra
€4.25
Each
units
2.5 → 4 V ac, 3 → 6 V ac 85 → 265V ac 3 → 6W 2 Through Hole Flyback - 1.2 A, 1.8 A Pin 18mm 17.5mm 16mm 18 x 17.5 x 16mm -
RS Stock No. 151-1278
Mfr. Part No.760301105
€2.76
Each
units
- 80V dc - 1 Surface Mount Signal & Power 260µH - Solder 7mm 7mm 6mm 7 x 7 x 6mm 1500 (Test)V
RS Stock No. 167-0209
Mfr. Part No.B78304B1030A003
BrandEPCOS
€2.596
Each (On a Reel of 900)
units
- - - 1 Surface Mount Broadband Transformers, Drive Transformers for Power Semiconductors, Low-power DC/DC Converters, Pulse Transformers 100nH - Gullwing 8mm 7mm 5.4mm 8 x 7 x 5.4mm -
RS Stock No. 106-8824
Mfr. Part No.77204C
€5.68
Each (In a Tube of 25)
units
- - - - Through Hole TRIAC Firing - - Pin 25.4mm - - 25.4 x 20.3 x 12.3mm -
RS Stock No. 144-6532
Mfr. Part No.760301104
€7.42
Each
units
- 80V dc - 1 Surface Mount Signal & Power 330µH - Solder 7mm 7mm 6mm 7 x 7 x 6mm -
RS Stock No. 792-4423
Mfr. Part No.47247
BrandMyrra
€19.35
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. 106-8582
Mfr. Part No.78602/2C
€1.328
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. 715-6986
Mfr. Part No.78602/2C
€1.46
Each
units
- - - 2 Through Hole Filtering 500µH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 106-8581
Mfr. Part No.78602/1C
€1.268
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. 816-4947
Mfr. Part No.760301303
€9.93
Each
units
80V ac 250V - 1 Surface Mount Flyback 750µH - Solder 10.5mm 10.5mm 11mm 10.5 x 10.5 x 11mm 1500 V dc, 2500 V ac
RS Stock No. 163-3832
Mfr. Part No.749196241
€4.147
Each (On a Reel of 400)
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 6.6µH 950mA - 16.3mm 12mm 7.4mm 16.3 x 12 x 7.4mm 500V dc
RS Stock No. 792-4385
Mfr. Part No.47156
BrandMyrra
€18.41
Each
units
24V 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. 106-8874
Mfr. Part No.78602/9C
€1.234
Each (In a Tube of 50)
units
- - - 2 Through Hole Filtering 10mH - Pin 9.52mm - - 9.52 x 9 x 6.35mm 1kV
RS Stock No. 792-4366
Mfr. Part No.47151
BrandMyrra
€18.05
Each
units
3.3V 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. 418-4089
Mfr. Part No.74070
BrandMyrra
€14.03
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. 522-5995
Mfr. Part No.749196121
€4.05
Each
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 14.7µH 550mA - 12.9mm 9.2mm 6.2mm 12.9 x 9.2 x 6.2mm 500V dc
RS Stock No. 792-4427
Mfr. Part No.47252
BrandMyrra
€10.64
Each
units
5V 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. 736-9996
Mfr. Part No.TGM-340NARL
€10.84
Each
units
- - - 2 Surface Mount - - - - 8.89mm 9.65mm 6.35mm 8.89 x 9.65 x 6.35mm -
RS Stock No. 792-4411
Mfr. Part No.47245
BrandMyrra
€9.09
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. 792-4391
Mfr. Part No.47133
BrandMyrra
€9.81
Each
units
9V dc 85 → 265 V ac, 85 → 370 V dc 3.2W 1 Through Hole - - - - 31.7mm 26.7mm 21.8mm 31.7 x 26.7 x 21.8mm -