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. 171-1196
Mfr. Part No.B82802A0012A315
BrandEPCOS
MYR9.234
Each (On a Reel of 300)
units
12 (Output 3) V, 3.3 (Output 2) V, 5 (Output 1) V 36 → 60V dc 12W 3 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. 106-8800
Mfr. Part No.78615/1C
MYR6.14
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. 522-6190
Mfr. Part No.749196501
MYR44.49
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. 792-4398
Mfr. Part No.47136
BrandMyrra
MYR38.20
Each
units
24V 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 -
RS Stock No. 522-6099
Mfr. Part No.749196311
MYR26.96
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. 144-6532
Mfr. Part No.760301104
MYR29.93
Each
units
- 80V dc - 1 Surface Mount Signal & Power 330µH - Solder 7mm 7mm 6mm 7 x 7 x 6mm -
RS Stock No. 715-6983
Mfr. Part No.78602/1C
MYR6.41
Each
units
- - - 2 Through Hole Filtering 2mH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 792-4363
Mfr. Part No.47126
BrandMyrra
MYR45.15
Each
units
24V 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. 106-8823
Mfr. Part No.77202C
MYR27.204
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. 715-6973
Mfr. Part No.78602/4C
MYR6.42
Each
units
- - - 2 Through Hole Filtering 100µH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 163-3834
Mfr. Part No.749196311
MYR17.502
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. 792-4408
Mfr. Part No.47163
BrandMyrra
MYR44.88
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. 816-4947
Mfr. Part No.760301303
MYR27.70
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