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. 774-8213
BrandRS PRO
€28.67
Each
units
- - 12W 1 Encapsulated - - - - 50mm 48mm 40mm - -
RS Stock No. 792-4401
Mfr. Part No.47164
BrandMyrra
€15.83
Each
units
12V 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. 823-5447
Mfr. Part No.760895731
€10.91
Each
units
12V - 250W 1 Through Hole - - 5A - 48mm 46mm 27.5mm 48 x 46 x 27.5mm 250V
RS Stock No. 163-5621
Mfr. Part No.760895731
€10.732
Each (In a Tray of 15)
units
12V - 250W 1 Through Hole - 475µH 5A - 48mm 46mm 27.5mm 48 x 46 x 27.5mm 250V
RS Stock No. 509-0979
Mfr. Part No.TCM 230V/12V 3VA
BrandEliwell
€18.88
Each
units
- - - - - - - - - - - - - -
RS Stock No. 418-4130
Mfr. Part No.74094
BrandMyrra
€3.23
Each
units
3.3 → 6V ac 85 → 265V ac 3.1W 1 PCB Mount Flyback 2.1mH 1.5A - 18mm 16mm 17.5mm 18 x 16 x 17.5mm -
RS Stock No. 171-1196
Mfr. Part No.B82802A0012A315
BrandEPCOS
€1.33
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. 823-5440
Mfr. Part No.760895641
€9.26
Each
units
24 V - 200W 1 Through Hole - - 3.5A - 44mm 43mm 30mm 44 x 43 x 30mm 250V
RS Stock No. 792-4372
Mfr. Part No.47154
BrandMyrra
€18.41
Each
units
12V 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. 163-5620
Mfr. Part No.760895641
€9.581
Each (In a Tray of 15)
units
24V - 200W 1 Through Hole - 500µH 3.5A - 44mm 43mm 30mm 44 x 43 x 30mm 250V
RS Stock No. 871-1650
Mfr. Part No.B82802A0012A315
BrandEPCOS
€1.27
Each
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 1500V ac
RS Stock No. 792-4394
Mfr. Part No.47134
BrandMyrra
€16.28
Each
units
12V 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. 418-5515
Mfr. Part No.74010
BrandMyrra
€4.77
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. 170-9240
Mfr. Part No.78601/2C
€1.11
Each (On a Reel of 50)
units
- - - 1 Through Hole Filtering 500µH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 418-5492
Mfr. Part No.74002
BrandMyrra
€4.03
Each
units
9 → 18V ac 85 → 265V ac 4.5 → 6W 1 Through Hole Flyback - 500mA Pin 18mm 17.5mm 16mm 18 x 17.5 x 16mm -
RS Stock No. 823-5434
Mfr. Part No.760895441
€7.92
Each
units
24V - 150W 1 Through Hole - - 2A - 36mm 36mm 26mm 36 x 36 x 26mm 250V
RS Stock No. 871-1666
Mfr. Part No.B82802A0055A225
BrandEPCOS
€2.71
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. 871-1654
Mfr. Part No.B82802A0030A220
BrandEPCOS
€1.81
Each
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 1500V ac
RS Stock No. 792-4354
Mfr. Part No.47125
BrandMyrra
€16.01
Each
units
15V 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. 418-5470
Mfr. Part No.74000
BrandMyrra
€3.03
Each
units
3.3 → 7 V dc, 8 → 17 V dc 85 → 265V ac 4W 2 Through Hole Flyback - 1.2 A, 350 mA Pin 18mm 17.5mm 16mm 18 x 17.5 x 16mm -
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