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
$68.79
Each
units
- - 12W 1 Encapsulated - - - - 50mm 48mm 40mm - -
RS Stock No. 792-4401
Mfr. Part No.47164
BrandMyrra
$14.53
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. 418-5559
Mfr. Part No.74040
BrandMyrra
$17.22
Each
units
3.3 → 7 V ac, 8 → 16.5 V ac 85 → 265V ac 35 → 40W 4 PCB Mount Flyback 500µH 1.5 A, 4 A - 37mm 37mm 27mm 37 x 37 x 27mm -
RS Stock No. 418-5543
Mfr. Part No.74030
BrandMyrra
$14.97
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. 163-5619
Mfr. Part No.760895431
$27.58
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. 522-6027
Mfr. Part No.749196141
$8.85
Each
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 8.5µH 550mA - 12.9mm 9.2mm 6.2mm 12.9 x 9.2 x 6.2mm 500V dc
RS Stock No. 792-4348
Mfr. Part No.47122
BrandMyrra
$37.76
Each
units
5V 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. 823-5425
Mfr. Part No.760895431
$28.10
Each
units
12V - 150W 1 Through Hole - - 2A - 36mm 36mm 26mm 36 x 36 x 26mm 250V
RS Stock No. 871-1666
Mfr. Part No.B82802A0055A225
BrandEPCOS
$12.76
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. 418-4073
Mfr. Part No.74060
BrandMyrra
$25.30
Each
units
3.3 → 6.5 V ac, 9 → 16.5 V ac 85 → 265V ac 70 → 120W 4 PCB Mount Flyback 440µH 3 A, 4 A, 5 A - 49mm 46mm 38mm 49 x 46 x 38mm -
RS Stock No. 418-5565
Mfr. Part No.74050
BrandMyrra
$15.04
Each
units
3.3 → 6.5 V ac, 9 → 16.5 V ac 85 → 265V ac 60 → 80W 4 PCB Mount Flyback 500µH 1.5 A, 3 A, 5 A - 43mm 40mm 34mm 43 x 40 x 34mm -
RS Stock No. 162-0296
Mfr. Part No.B82802A0055A225
BrandEPCOS
$8.679
Each (On a Reel of 80)
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 1.5kV ac
RS Stock No. 418-4146
Mfr. Part No.74095
BrandMyrra
$12.13
Each
units
7.5 → 15V ac 85 → 265V ac 4.2W 1 PCB Mount Flyback 2.1mH 900mA - 18mm 16mm 17.5mm 18 x 16 x 17.5mm -
RS Stock No. 823-5447
Mfr. Part No.760895731
$36.41
Each
units
12V - 250W 1 Through Hole - - 5A - 48mm 46mm 27.5mm 48 x 46 x 27.5mm 250V
RS Stock No. 163-5620
Mfr. Part No.760895641
$29.61
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. 792-4382
Mfr. Part No.47132
BrandMyrra
$17.83
Each
units
5V 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. 522-5995
Mfr. Part No.749196121
$8.44
Each
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 14.7µH 550mA - 12.9mm 9.2mm 6.2mm 12.9 x 9.2 x 6.2mm 500V dc
RS Stock No. 522-6049
Mfr. Part No.749196211
$10.25
Each
units
- - - 3 Surface Mount Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 21.6µH 950mA - 16.3mm 12mm 7.4mm 16.3 x 12 x 7.4mm 500V dc
RS Stock No. 163-5621
Mfr. Part No.760895731
$35.75
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. 418-5492
Mfr. Part No.74002
BrandMyrra
$8.42
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 -