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. 792-4436
Mfr. Part No.47254
BrandMyrra
£17.41
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. 106-8828
Mfr. Part No.77209C
£4.90
Each (In a Tube of 25)
Units
- - - 2 Through Hole TRIAC Firing - - Pin 25.4mm - - 25.4 x 20.3 x 12.3mm -
RS Stock No. 715-6945
Mfr. Part No.77209C
£5.39
Each
Units
- - - 2 Through Hole TRIAC Firing - - Pin 25.4mm 20.3mm 12.3mm 25.4 x 20.3 x 12.3mm -
RS Stock No. 792-4408
Mfr. Part No.47163
BrandMyrra
£4.55
Each
Units
9V 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. 792-4414
Mfr. Part No.47243
BrandMyrra
£8.76
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. 792-4366
Mfr. Part No.47151
BrandMyrra
£14.66
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. 522-5995
Mfr. Part No.749196121
£3.58
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. 792-4442
Mfr. Part No.47258
BrandMyrra
£15.68
Each
Units
8 V dc, 18 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. 106-8874
Mfr. Part No.78602/9C
£1.092
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. 522-6190
Mfr. Part No.749196501
£7.14
Each
Units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 196µH 1.7A - 21mm 21mm 10.8mm 21 x 21 x 10.8mm 500V dc
RS Stock No. 715-6970
Mfr. Part No.78602/9C
£1.20
Each
Units
- - - 2 Through Hole Filtering 10mH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 522-6005
Mfr. Part No.749196131
£3.92
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. 715-6933
Mfr. Part No.77205C
£5.39
Each
Units
- - - - Through Hole TRIAC Firing - - Pin 25.4mm 20.3mm 12.3mm 25.4 x 20.3 x 12.3mm -
RS Stock No. 106-8820
Mfr. Part No.77205C
£4.90
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. 522-6061
Mfr. Part No.749196231
£3.96
Each
Units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 8.3µH 950mA - 16.3mm 12mm 7.4mm 16.3 x 12 x 7.4mm 500V dc
RS Stock No. 871-1666
Mfr. Part No.B82802A0055A225
BrandEPCOS
£1.07
Each
Units
12 (Output 1) V, 5 (Output 2) 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. 167-0209
Mfr. Part No.B78304B1030A003
BrandEPCOS
£2.337
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. 162-0296
Mfr. Part No.B82802A0055A225
BrandEPCOS
£0.857
Each (On a Reel of 80)
Units
12 (Output 1) V, 5 (Output 2) 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. 163-3830
Mfr. Part No.749196231
£3.67
Each (On a Reel of 400)
Units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 8.3µH 950mA - 16.3mm 12mm 7.4mm 16.3 x 12 x 7.4mm 500V dc
RS Stock No. 841-6762
Mfr. Part No.B78304B1030A003
BrandEPCOS
£2.38
Each
Units
- - - 1 Surface Mount Pulse Transformers, Broadband Transformers, Drive Transformers for Power Semiconductors, Low-power DC/DC Converters 100nH - Gullwing 8mm 7mm 5.4mm 8 x 7 x 5.4mm -
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