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. 715-6939
Mfr. Part No.77204C
$11.75
Each
units
- - - - Through Hole TRIAC Firing - - Pin 25.4mm 20.3mm 12.3mm 25.4 x 20.3 x 12.3mm -
RS Stock No. 792-4385
Mfr. Part No.47156
BrandMyrra
$15.17
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. 522-6027
Mfr. Part No.749196141
$7.78
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. 167-0209
Mfr. Part No.B78304B1030A003
BrandEPCOS
$6.10
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. 792-4376
Mfr. Part No.47155
BrandMyrra
$31.86
Each
units
15V 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. 522-5973
Mfr. Part No.749196101
$9.07
Each
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 198.6µH 550mA - 12.9mm 9.2mm 6.2mm 12.9 x 9.2 x 6.2mm 500V dc
RS Stock No. 816-4950
Mfr. Part No.760301305
$11.31
Each
units
80V ac 250V - 1 Surface Mount Flyback 735µH - Solder 10.5mm 10.5mm 11mm 10.5 x 10.5 x 11mm 1500 V dc, 2500 V ac
RS Stock No. 792-4344
Mfr. Part No.47121
BrandMyrra
$29.83
Each
units
3.3V 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. 106-8874
Mfr. Part No.78602/9C
$2.29
Each (In a Tube of 50)
units
- - - 2 Through Hole Filtering 10mH - Pin 9.52mm - - 9.52 x 9 x 6.35mm 1kV
RS Stock No. 106-8830
Mfr. Part No.78601/3C
$2.29
Each (In a Tube of 50)
units
- - - 1 Through Hole Filtering 200µH - Pin 9.52mm - - 9.52 x 9 x 6.35mm 1kV
RS Stock No. 792-4411
Mfr. Part No.47245
BrandMyrra
$17.49
Each
units
5.5 V dc, 12 V dc 85 → 265 V ac, 85 → 370 V dc 3.2W 2 Through Hole - - - - 31.7mm 26.7mm 21.8mm 31.7 x 26.7 x 21.8mm -
RS Stock No. 871-1654
Mfr. Part No.B82802A0030A220
BrandEPCOS
$9.90
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. 162-0280
Mfr. Part No.B82802A0030A320
BrandEPCOS
$5.63
Each (On a Reel of 160)
units
12 (Output 3) V, 3.3 (Output 2) V, 5 (Output 1) V 36 → 60V dc 30W 3 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. 792-4360
Mfr. Part No.47152
BrandMyrra
$31.86
Each
units
5V 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. 170-9245
Mfr. Part No.78615/16C
$2.29
Each (On a Reel of 50)
units
- - - 2 Through Hole Filtering 4mH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 170-9242
Mfr. Part No.78602/4C
$2.29
Each (On a Reel of 50)
units
- - - 2 Through Hole Filtering 100µH - Pin 9.52mm 9mm 6.35mm 9.52 x 9 x 6.35mm 1kV
RS Stock No. 792-4382
Mfr. Part No.47132
BrandMyrra
$16.21
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. 522-6128
Mfr. Part No.749196341
$11.33
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. 522-6099
Mfr. Part No.749196311
$10.77
Each
units
- - - - - Flyback, Forward, Push-Pull, SEPIC, Step Down, Step Up 23.3µH 970mA - 17.5mm 16mm 8.3mm 17.5 x 16 x 8.3mm 500V dc
RS Stock No. 106-8855
Mfr. Part No.78601/1C
$2.29
Each (In a Tube of 50)
units
- - - 1 Through Hole Filtering 2mH - Pin 9.52mm - - 9.52 x 9 x 6.35mm 1kV
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