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. 418-4089
Mfr. Part No.74070
BrandMyrra
HK$139.69
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. 418-5515
Mfr. Part No.74010
BrandMyrra
HK$42.95
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. 522-6033
Mfr. Part No.749196201
HK$52.18
Each
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 140µH 950mA - 16.3mm 12mm 7.4mm 16.3 x 12 x 7.4mm 500V dc
RS Stock No. 522-5973
Mfr. Part No.749196101
HK$43.01
Each
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 198.6µH 550mA - 12.9mm 9.2mm 6.2mm 12.9 x 9.2 x 6.2mm 500V dc
RS Stock No. 522-6083
Mfr. Part No.749196301
HK$64.69
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. 418-5543
Mfr. Part No.74030
BrandMyrra
HK$54.51
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. 522-6207
Mfr. Part No.749196511
HK$62.06
Each
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 22.3µH 1.7A - 21mm 21mm 10.8mm 21 x 21 x 10.8mm 500V dc
RS Stock No. 522-6099
Mfr. Part No.749196311
HK$64.60
Each
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 23.3µH 970mA - 17.5mm 16mm 8.3mm 17.5 x 16 x 8.3mm 500V dc
RS Stock No. 162-0296
Mfr. Part No.B82802A0055A225
BrandEPCOS
HK$41.943
Each (On a Reel of 80)
units
5 (Output 2) V, 12 (Output 1) 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. 163-3834
Mfr. Part No.749196311
HK$32.342
Each (On a Reel of 300)
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 23.3µH 970mA - 17.5mm 16mm 8.3mm 17.5 x 16 x 8.3mm 500V dc
RS Stock No. 522-6190
Mfr. Part No.749196501
HK$92.28
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. 871-1657
Mfr. Part No.B82802A0012A215
BrandEPCOS
HK$35.34
Each
units
5 (Output 2) V, 12 (Output 1) V 36 → 60V dc 12W 2 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. 162-0231
Mfr. Part No.B82802A0012A215
BrandEPCOS
HK$18.449
Each (On a Reel of 300)
units
5 (Output 2) V, 12 (Output 1) V 36 → 60V dc 12W 2 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. 715-6949
Mfr. Part No.78601/4C
HK$12.76
Each
units
- - - 1 Through Hole Filtering 100µH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 106-8829
Mfr. Part No.78601/4C
HK$12.198
Each (In a Tube of 50)
units
- - - 1 Through Hole Filtering 100µH - Pin 9.52mm - - 9.52 x 9 x 6.35mm 1kV
RS Stock No. 871-1666
Mfr. Part No.B82802A0055A225
BrandEPCOS
HK$66.90
Each
units
5 (Output 2) V, 12 (Output 1) 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. 522-6140
Mfr. Part No.749196510
HK$85.31
Each
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 9.9µH 1.91A - 21mm 21mm 10.8mm 21 x 21 x 10.8mm 500V dc
RS Stock No. 418-5537
Mfr. Part No.74020
BrandMyrra
HK$40.38
Each
units
4 → 7 V ac, 10 → 17 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. 715-6958
Mfr. Part No.78601/3C
HK$12.76
Each
units
- - - 1 Through Hole Filtering 200µH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 522-6128
Mfr. Part No.749196341
HK$34.48
Each
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 7.9µH 970mA - 17.5mm 16mm 8.3mm 17.5 x 16 x 8.3mm 500V dc