DC/DC Converter - 5V 5W (R-78E)

This R-78E DC/DC Converter is a switching regulator module that has been designed to offer all the advantages of a switching regulator (high efficiency, wide input range, accurate output voltage regulation) but at an economic cost with the ease of adding it to your project.

Due to the R-78E’s high efficiency of up to 91 percent at an output voltage of 5V/1A at the output, no heat sink is required. The compact TO-220 compatible SIP3 package measures only 11.6mm x 8.5mm x 10.4mm, saving precious board space.

  • Efficiency up to 91%, no need for heatsinks!
  • Pin-out compatible with LM78XX linear regs
  • Low profile
  • Wide input range (7V--28V)
  • Short-circuit protection
  • IEC/EN60950-1, Am2 certified

DC/DC Converter - 5V 5W (R-78E) Product Help and Resources

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Core Skill: Soldering

This skill defines how difficult the soldering is on a particular product. It might be a couple simple solder joints, or require special reflow tools.

1 Soldering

Skill Level: Noob - Some basic soldering is required, but it is limited to a just a few pins, basic through-hole soldering, and couple (if any) polarized components. A basic soldering iron is all you should need.
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Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

2 Electrical Prototyping

Skill Level: Rookie - You may be required to know a bit more about the component, such as orientation, or how to hook it up, in addition to power requirements. You will need to understand polarized components.
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Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • tritan67 / about 5 years ago / 1

    What is it mean by soft start on the power supply? Was reading datasheet.

  • ERROR on the description.... min input voltage is 8V...datasheet says 7V is for the 3.3v output version of this...

  • Submariner pro / about 6 years ago / 1

    This little guy is so cool!! I wish it regulated to more than 5v 1A though.

  • This is perfect! Any chance a similar (all in one with no supporting components) step-up is on the way? Preferably one that comes with adjustable or varying outputs.

Customer Reviews

4 out of 5

Based on 2 ratings:

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I'd buy this again. it's very handy for prototyping on a breadboard, with 3.3 and 5V available simultaneously, and pins on the bottom for the breadboard and on top for other uses.

Works perfectly.

I got this to regulate 12v down to 5v for an SAMD21 board that had a 5v to 3.3v regulator built in. This buck converter worked perfectly and has a very small footprint. Highly recommend.