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. 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. 792-4442
Mfr. Part No.47258
BrandMyrra
€19.03
Each
units
8 V dc, 18 V dc 85 → 265 V ac, 85 → 370 V dc 5W 2 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 -
RS Stock No. 792-4436
Mfr. Part No.47254
BrandMyrra
€19.65
Each
units
12V dc 85 → 265 V ac, 85 → 370 V dc 5W 2 Through Hole - - - - 31.7mm 26.7mm 21.8mm 31.7 x 26.7 x 21.8mm -
RS Stock No. 418-5543
Mfr. Part No.74030
BrandMyrra
€7.07
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. 823-5434
Mfr. Part No.760895441
€15.45
Each
units
24V - 150W 1 Through Hole - - 2A - 36mm 36mm 26mm 36 x 36 x 26mm 250V
RS Stock No. 163-5623
Mfr. Part No.760895751
€17.337
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. 106-8584
Mfr. Part No.78602/16C
€1.268
Each (In a Tube of 50)
units
- - - 2 Through Hole Filtering 4mH - Pin 9.52mm - - 9.52 x 9 x 6.35mm 1kV
RS Stock No. 522-6061
Mfr. Part No.749196231
€4.47
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. 106-8785
Mfr. Part No.78615/8C
€1.268
Each (In a Tube of 50)
units
- - - 2 Through Hole Filtering 1mH - Pin 9.52mm - - 9.52 x 9 x 6.35mm 1kV
RS Stock No. 170-9244
Mfr. Part No.78615/2C
€1.234
Each (On a Reel of 50)
units
- - - 2 Through Hole Filtering 500µH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 715-6964
Mfr. Part No.78601/1C
€1.36
Each
units
- - - 1 Through Hole Filtering 2mH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 522-6128
Mfr. Part No.749196341
€5.98
Each
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 7.9µH 970mA - 17.5mm 16mm 8.3mm 17.5 x 16 x 8.3mm 500V dc
RS Stock No. 792-4363
Mfr. Part No.47126
BrandMyrra
€17.64
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. 715-7018
Mfr. Part No.78615/16C
€0.97
Each
units
- - - 2 Through Hole Filtering 4mH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 106-8841
Mfr. Part No.78601/9C
€1.268
Each (In a Tube of 50)
units
- - - 1 Through Hole Filtering 10mH - Pin 9.52mm - - 9.52 x 9 x 6.35mm 1kV
RS Stock No. 715-6967
Mfr. Part No.78601/16C
€1.50
Each
units
- - - 1 Through Hole Filtering 4mH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 106-8825
Mfr. Part No.77208C
€5.865
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. 715-6936
Mfr. Part No.77202C
€5.87
Each
units
- - - - Through Hole TRIAC Firing - - Pin 25.4mm 20.3mm 12.3mm 25.4 x 20.3 x 12.3mm -
RS Stock No. 715-6961
Mfr. Part No.78601/9C
€1.32
Each
units
- - - 2 Through Hole Filtering 10mH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV