Transformer classic or an electronic one?

If we´re deciding whether to use a classic transformer or better a modern electronic switch-mode power supply (SMPS), it´s good to realize pros and cons of both technologies.

This is an archive article published 05/21/2014. Some information may no longer be up to date and in line with the current state. Please contact us in case of interest.

Switch mode power supplies Myrra series 47000 already found their stable place on the market and they gradually replace classic transformers. Why is it so?

Switch-mode power supplies definitely win in a perhaps the most important requirement of these days - in efficiency (in a whole load range) and in a low no-load consumption (Standby). Similarly also many other factors say in favor of switch-mode power supplies, for example power/ weight ratio, size, simple elimination of a high inrush current, silent operation, minimum stray magnetic field, ...

From these reasons for the majority of applications it´s better and often even cheaper to use an “electronic replacement” of transformer - for example modules series Myrra 47xxx or AC/DC modules Traco Power for higher power ratings.

Maybe it´s worth to question, whether there´s still any reason to use a classic transformer in usual applications with power demands say 1-1000W? Surely yes, for example in application very sensitive to HF radiation (HF receivers, pre-amplifiers,…) but also in applications with a demand for the highest reliability for decades. Transformer is a component which almost doesn´t age and if properly sealed in a resin, then it´s lifetime is extremely long. As a transformer doesn´t contain any semiconductors, capacitors etc, it´s also very resistant to various spikes, overvoltages and noise in a power line...

Power supplies of 47000 series have a very low no-load power consumption - only 200 mW, resp. 300 mW at unregulated types. With the 4000VAC isolation (input/output), they´re ready for a class II – reinforced isolation. With a built-in protection against shortcut and over-temperature, they´re ready for usage in a virtually any device with power demands up to approx. 5-5,4W.

Detailed information will provide you the Myrra 47000 datasheet and the article Save energy and production costs with Myrra 47000 switch-mode power supplies.

In case of interest, please contact us at info@soselectronic.com.

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Additional products


47114 MYRRA  
47114

AC/DC Power Supply for PCB 2,4W 12V/0,2A Non Regulated

PCB Mount AC/DC Converters

Ord. No.: 128755
Manufacturer: MYRRA
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47121 MYRRA  
47121

AC/DC Power Supply for PCB 2,5W 3,3V/0,75A Regulated

PCB Mount AC/DC Converters

Ord. No.: 101290
Manufacturer: MYRRA
in stock 0 pcs
(05/27/2022: 600 pcs)
(06/03/2022: 400 pcs)
(07/29/2022: 600 pcs)
(We are checking the delivery date: 400 pcs)
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5,99 €
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4,51 €
3,95 €
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47122 MYRRA  
47122

AC/DC Power Supply for PCB 2,75W 5V/0,55A Regulated

PCB Mount AC/DC Converters

Ord. No.: 101291
Manufacturer: MYRRA
in stock 3177 pcs
(06/24/2022: 1000 pcs)
1 pcs+
5 pcs+
25 pcs+
100 pcs+
5,37 €
4,80 €
4,05 €
3,54 €
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47123 MYRRA  
47123

AC/DC Power Supply for PCB 2,5W 9V/0,27A Regulated

PCB Mount AC/DC Converters

Ord. No.: 101292
Manufacturer: MYRRA
in stock 314 pcs
1 pcs+
5 pcs+
25 pcs+
100 pcs+
5,71 €
5,10 €
4,30 €
3,77 €
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47124 MYRRA  
47124

AC/DC Power Supply for PCB 2,5W 12V/0,21A Regulated

PCB Mount AC/DC Converters

Ord. No.: 101293
Manufacturer: MYRRA
in stock 2074 pcs
(07/15/2022: 1600 pcs)
(09/02/2022: 3000 pcs)
1 pcs+
5 pcs+
25 pcs+
100 pcs+
5,27 €
4,71 €
3,97 €
3,48 €
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47125 MYRRA  
47125

AC/DC Power Supply for PCB 2,5W 15V/0,17A Regulated

PCB Mount AC/DC Converters

Ord. No.: 101294
Manufacturer: MYRRA
in stock 87 pcs
(We are checking the delivery date: 100 pcs)
1 pcs+
5 pcs+
25 pcs+
100 pcs+
6,03 €
5,39 €
4,54 €
3,98 €
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47126 MYRRA  
47126

AC/DC Power Supply for PCB 2,5W 24V/0,11A Regulated

PCB Mount AC/DC Converters

Ord. No.: 101295
Manufacturer: MYRRA
25 pcs+
100 pcs+
4,97 €
4,35 €
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47132 MYRRA  
47132

AC/DC Power Supply for PCB 2,5W 5V/0,5A Regulated

PCB Mount AC/DC Converters

Ord. No.: 128759
Manufacturer: MYRRA
in stock 62 pcs
1 pcs+
5 pcs+
25 pcs+
100 pcs+
6,48 €
5,79 €
4,88 €
4,27 €
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47133 MYRRA  
47133

AC/DC Power Supply for PCB 3,2W 9V/0,36A Non Regulated

PCB Mount AC/DC Converters

Ord. No.: 114286
Manufacturer: MYRRA
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47134 MYRRA  
47134

AC/DC Power Supply for PCB 3,2W 12V/0,27A Non Regulated

PCB Mount AC/DC Converters

Ord. No.: 126357
Manufacturer: MYRRA
in stock 0 pcs
(07/01/2022: 1500 pcs)
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100 pcs+
4,66 €
4,16 €
3,51 €
3,07 €
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47135 MYRRA  
47135

AC/DC Power Supply for PCB 3,2W 18V/0,18A Non Regulated

PCB Mount AC/DC Converters

Ord. No.: 128760
Manufacturer: MYRRA
1 pcs+
5 pcs+
25 pcs+
100 pcs+
6,47 €
5,78 €
4,87 €
4,27 €
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47136 MYRRA  
47136

AC/DC Power Supply for PCB 3,2W 24V/0,13A Non Regulated

PCB Mount AC/DC Converters

Ord. No.: 128761
Manufacturer: MYRRA
in stock 30 pcs
1 pcs+
5 pcs+
25 pcs+
100 pcs+
5,75 €
5,14 €
4,33 €
3,79 €
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47151 MYRRA  
47151

AC/DC Power Supply for PCB 4,2W 3,3V/1,35A Regulated

PCB Mount AC/DC Converters

Ord. No.: 101296
Manufacturer: MYRRA
in stock 0 pcs
(05/20/2022: 200 pcs)
(05/27/2022: 300 pcs)
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5,83 €
5,21 €
4,39 €
3,85 €
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47152 MYRRA  
47152

AC/DC Power Supply for PCB 4,5W 5V/0,9A Regulated

PCB Mount AC/DC Converters

Ord. No.: 101297
Manufacturer: MYRRA
in stock 0 pcs
(06/10/2022: 3500 pcs)
(09/09/2022: 1000 pcs)
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5,31 €
4,74 €
4,00 €
3,50 €
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47153 MYRRA  
47153

AC/DC Power Supply for PCB 5W 9V/0,55A Regulated

PCB Mount AC/DC Converters

Ord. No.: 101298
Manufacturer: MYRRA
in stock 514 pcs
(05/27/2022: 1000 pcs)
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5,24 €
4,68 €
3,94 €
3,45 €
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47154 MYRRA  
47154

AC/DC Power Supply for PCB 5W 12V/0,42A Regulated

PCB Mount AC/DC Converters

Ord. No.: 101299
Manufacturer: MYRRA
in stock 2201 pcs
(05/27/2022: 1000 pcs)
(We are checking the delivery date: 1000 pcs)
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4,87 €
4,10 €
3,59 €
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47155 MYRRA  
47155

AC/DC Power Supply for PCB 5W 15V/0,32A Regulated

PCB Mount AC/DC Converters

Ord. No.: 101300
Manufacturer: MYRRA
in stock 1025 pcs
(07/29/2022: 2000 pcs)
(08/05/2022: 1000 pcs)
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5,12 €
4,57 €
3,85 €
3,37 €
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47156 MYRRA  
47156

AC/DC Power Supply for PCB 5W 24V/0,22A Regulated

PCB Mount AC/DC Converters

Ord. No.: 101301
Manufacturer: MYRRA
in stock 0 pcs
(07/22/2022: 2000 pcs)
(07/29/2022: 1000 pcs)
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5,42 €
4,84 €
4,08 €
3,58 €
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47162 MYRRA  
47162

AC/DC Power Supply for PCB 4,5W 5V/0,9A Non Regulated

PCB Mount AC/DC Converters

Ord. No.: 128762
Manufacturer: MYRRA
in stock 106 pcs
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5,75 €
5,14 €
4,33 €
3,79 €
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47163 MYRRA  
47163

AC/DC Power Supply for PCB 5W 9V/0,55A Non Regulated

PCB Mount AC/DC Converters

Ord. No.: 128763
Manufacturer: MYRRA
in stock 13 pcs
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5,73 €
5,12 €
4,31 €
3,78 €
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47164 MYRRA  
47164

AC/DC Power Supply for PCB 5W 12V/0,42A Non Regulated

PCB Mount AC/DC Converters

Ord. No.: 109921
Manufacturer: MYRRA
in stock 0 pcs
(We are checking the delivery date: 1000 pcs)
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25 pcs+
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4,93 €
4,41 €
3,71 €
3,25 €
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47165 MYRRA  
47165

AC/DC Power Supply for PCB 5W 18V/0,28A Non Regulated

PCB Mount AC/DC Converters

Ord. No.: 115658
Manufacturer: MYRRA
in stock 0 pcs
(06/24/2022: 50 pcs)
1 pcs+
5 pcs+
25 pcs+
100 pcs+
7,62 €
6,81 €
5,74 €
5,03 €
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47166 MYRRA  
47166

AC/DC Power Supply for PCB 5W 24V/0,21A Non Regulated

PCB Mount AC/DC Converters

Ord. No.: 109922
Manufacturer: MYRRA
in stock 50 pcs
1 pcs+
5 pcs+
25 pcs+
100 pcs+
5,75 €
5,14 €
4,33 €
3,79 €
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47243 MYRRA  
47243

AC/DC Power Supply for PCB 4W 10,5V/0,38A 7V/0,1A Regulated

PCB Mount AC/DC Converters

Ord. No.: 128765
Manufacturer: MYRRA
100 pcs+
4,83 €
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47245 MYRRA  
47245

AC/DC Power Supply for PCB 4W 12V/0,13A 5,5V/0,3A Regulated

PCB Mount AC/DC Converters

Ord. No.: 128767
Manufacturer: MYRRA
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47246 MYRRA  
47246

AC/DC Power Supply for PCB 4W 5V/0,4A 12V/0,17A Regulated

PCB Mount AC/DC Converters

Ord. No.: 101302
Manufacturer: MYRRA
in stock 0 pcs
(06/10/2022: 100 pcs)
1 pcs+
5 pcs+
25 pcs+
100 pcs+
6,63 €
5,93 €
5,00 €
4,38 €
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47247 MYRRA  
47247

AC/DC Power Supply for PCB 4W ±15V/0,13A Regulated

PCB Mount AC/DC Converters

Ord. No.: 103094
Manufacturer: MYRRA
in stock 6 pcs
(08/26/2022: 100 pcs)
1 pcs+
5 pcs+
25 pcs+
100 pcs+
6,55 €
5,85 €
4,93 €
4,32 €
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47252 MYRRA  
47252

AC/DC Power Supply for PCB 3,5W 5V/0,6A 5V/0,6A Regulated

PCB Mount AC/DC Converters

Ord. No.: 103895
Manufacturer: MYRRA
in stock 166 pcs
1 pcs+
5 pcs+
25 pcs+
100 pcs+
6,35 €
5,68 €
4,79 €
4,19 €
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47254 MYRRA  
47254

AC/DC Power Supply for PCB 5W 12V/0,165A 12V/0,165A Regulated

PCB Mount AC/DC Converters

Ord. No.: 103185
Manufacturer: MYRRA
in stock 553 pcs
1 pcs+
5 pcs+
25 pcs+
100 pcs+
5,69 €
5,09 €
4,29 €
3,75 €
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47255 MYRRA  
47255

AC/DC Power Supply for PCB 5W 2x15V/0,17A Regulated

PCB Mount AC/DC Converters

Ord. No.: 121875
Manufacturer: MYRRA
in stock 213 pcs
(07/01/2022: 52 pcs)
(07/08/2022: 100 pcs)
1 pcs+
5 pcs+
25 pcs+
100 pcs+
6,62 €
5,92 €
4,99 €
4,37 €
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47257 MYRRA  
47257

AC/DC Power Supply for PCB 4W 5V/0,4A 12V/0,17A Regulated

PCB Mount AC/DC Converters

Ord. No.: 103306
Manufacturer: MYRRA
in stock 0 pcs
(06/03/2022: 1400 pcs)
(08/19/2022: 3100 pcs)
1 pcs+
5 pcs+
25 pcs+
100 pcs+
5,58 €
4,99 €
4,20 €
3,68 €
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47258 MYRRA  
47258 new

AC/DC Power Supply for PCB 5W 18V/0,15A 8V/0,15A Regulated

PCB Mount AC/DC Converters

Ord. No.: 128764
Manufacturer: MYRRA
in stock 0 pcs
(07/29/2022: 1200 pcs)
1 pcs+
5 pcs+
25 pcs+
100 pcs+
5,78 €
5,16 €
4,35 €
3,81 €
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