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. 163-5620
Mfr. Part No.760895641
£13.00
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. 792-4379
Mfr. Part No.47153
BrandMyrra
£15.31
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. 792-4394
Mfr. Part No.47134
BrandMyrra
£14.41
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. 792-4405
Mfr. Part No.47166
BrandMyrra
£13.97
Each
Units
24V 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. 522-6083
Mfr. Part No.749196301
£5.32
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. 792-4420
Mfr. Part No.47246
BrandMyrra
£16.91
Each
Units
5 V dc, 12 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. 871-1657
Mfr. Part No.B82802A0012A215
BrandEPCOS
£3.05
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. 162-0231
Mfr. Part No.B82802A0012A215
BrandEPCOS
£1.728
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. 792-4357
Mfr. Part No.47123
BrandMyrra
£7.54
Each
Units
9V 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. 162-1318
Mfr. Part No.760895451
£12.11
Each (In a Tray of 20)
Units
48V - 150W 1 Through Hole - 600µH 2A - 36mm 36mm 26mm 36 x 36 x 26mm 250V
RS Stock No. 823-5443
Mfr. Part No.760895651
£13.86
Each
Units
48V - 200W 1 Through Hole - - 3.5A - 44mm 43mm 30mm 44 x 43 x 30mm 250V
RS Stock No. 418-5509
Mfr. Part No.74003
BrandMyrra
£3.76
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. 823-5425
Mfr. Part No.760895431
£13.32
Each
Units
12V - 150W 1 Through Hole - - 2A - 36mm 36mm 26mm 36 x 36 x 26mm 250V
RS Stock No. 823-5437
Mfr. Part No.760895451
£13.32
Each
Units
48V - 150W 1 Through Hole - - 2A - 36mm 36mm 26mm 36 x 36 x 26mm 250V
RS Stock No. 162-1314
Mfr. Part No.760895651
£12.60
Each (In a Tray of 15)
Units
48V - 200W 1 Through Hole - 500µH 3.5A - 44mm 43mm 30mm 44 x 43 x 30mm 250V
RS Stock No. 792-4350
Mfr. Part No.47124
BrandMyrra
£14.68
Each
Units
12V 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. 163-5619
Mfr. Part No.760895431
£12.11
Each (In a Tray of 20)
Units
12V - 150W 1 Through Hole - 600µH 2A - 36mm 36mm 26mm 36 x 36 x 26mm 250V
RS Stock No. 816-4941
Mfr. Part No.760301304
£8.58
Each
Units
80V ac 250V - 1 Surface Mount Flyback 1.08mH - Solder 10.5mm 10.5mm 11mm 10.5 x 10.5 x 11mm 1500 V dc, 2500 V ac
RS Stock No. 715-6936
Mfr. Part No.77202C
£5.29
Each
Units
- - - - Through Hole TRIAC Firing - - Pin 25.4mm 20.3mm 12.3mm 25.4 x 20.3 x 12.3mm -
RS Stock No. 106-8823
Mfr. Part No.77202C
£5.117
Each (In a Tube of 25)
Units
- - - - Through Hole TRIAC Firing - - Pin 25.4mm - - 25.4 x 20.3 x 12.3mm -