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. 715-6986
Mfr. Part No.78602/2C
MYR6.22
Each
units
- - - 2 Through Hole Filtering 500µH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 715-6939
Mfr. Part No.77204C
MYR36.32
Each
units
- - - - Through Hole TRIAC Firing - - Pin 25.4mm 20.3mm 12.3mm 25.4 x 20.3 x 12.3mm -
RS Stock No. 816-4953
Mfr. Part No.760301306
MYR27.70
Each
units
80V ac 250V ac - 1 Surface Mount Flyback 1.8mH - Solder 10.5mm 10.5mm 11mm 10.5 x 10.5 x 11mm 1500 V dc, 2500 V ac
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. 151-1280
Mfr. Part No.760301106
MYR33.29
Each
units
- 80V dc - 1 Surface Mount Signal & Power 370µH - Solder 7mm 7mm 6mm 7 x 7 x 6mm 1500 (Test)V
RS Stock No. 163-3832
Mfr. Part No.749196241
MYR22.521
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. 162-0231
Mfr. Part No.B82802A0012A215
BrandEPCOS
MYR9.234
Each (On a Reel of 300)
units
12 (Output 1) V, 5 (Output 2) 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. 418-5509
Mfr. Part No.74003
BrandMyrra
MYR26.65
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. 163-5623
Mfr. Part No.760895751
MYR83.403
Each (In a Tray of 15)
units
48V - 250W 1 Through Hole - 400µH 4.3A - 48mm 46mm 27.5mm 48 x 46 x 27.5mm 250V
RS Stock No. 871-1657
Mfr. Part No.B82802A0012A215
BrandEPCOS
MYR14.09
Each
units
12 (Output 1) V, 5 (Output 2) 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. 841-6762
Mfr. Part No.B78304B1030A003
BrandEPCOS
MYR22.82
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 -
RS Stock No. 167-0209
Mfr. Part No.B78304B1030A003
BrandEPCOS
MYR16.965
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. 181-0908
Mfr. Part No.TRH2K-21S
BrandToyogiken
MYR2,388.09
Each
units
- - - - - - - - Screw - - - - -
RS Stock No. 522-6134
Mfr. Part No.749196500
MYR42.87
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. 151-1273
Mfr. Part No.760301108
MYR23.351
Each (On a Reel of 800)
units
- 80V dc - 1 Surface Mount Signal & Power 460µH - Solder 7mm 7mm 6mm 7 x 7 x 6mm 1500 (Test)V
RS Stock No. 162-0279
Mfr. Part No.B82802A0030A220
BrandEPCOS
MYR14.34
Each (On a Reel of 160)
units
12 (Output 1) V, 5 (Output 2) V 36 → 60V dc 30W 2 Surface Mount DC to DC Converter, Flyback, Power Over Ethernet, Power Sourcing Equipment, Powered Devices 40µH - Gullwing 25.7mm - - 25.7 x 22 x 10.7mm 1.5kV ac
RS Stock No. 522-6033
Mfr. Part No.749196201
MYR27.25
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. 522-6061
Mfr. Part No.749196231
MYR26.41
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. 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