Display prices in

Home | Product Categories | General ICs | COM-00107

Voltage Regulator - 5V

sku: COM-00107 RoHS Compliant In Fritzing Library

Description: Basic voltage regulators in the TO-220 package. A must have for basic 5V electronics.

Check out our Unregulated Power Supply Tutorial!

Documents:

Datasheet

Pricing

images are CC BY-NC-SA 3.0

ASCII version

Comments 16 comments

Sacman | about a year ago 4

I just found out that these Regulators will stop regulating somewhere between 7v and 7.5v. Trying to use a 9v battery with one of these is a mistake. I found this out the hard way driving a Pic and a 4D 1.44 ulCD display (these displays rock!). I have spent the last day trying to figure out why everything went wonky on me until I read about this.
What I have gathered is I need a low drop out (LDO) regulator to make this work. DigiKey has an LP2989IM-5.0-ND which supplies 5V/500mA with a drop out of .31v which allows for a lot better utilization of the 9V battery. I may eventually go with a LiPO option but the 9V fits my project well. The Display draws a maximum of 180mA and most of my display is black so it should be well less than the max. With a 9v supplying about 500mAh, I would be content to get about 3 hours of solid uptime with the PIC taking up essentially none.
Hope this helps someone in the future.
Member #98770 | about a year ago 2

WARNING: Be sure to have correct polarity on this, otherwise it will get extremly hot very quickly. Melted my wires :).
JLC | about 2 years ago 1

Tried supplying it with 4 AA batteries (6v) but it will not output 5v then. So if you plan power your project with batteries using this then go for 9v. Or just drop the regulator and use the “NCP1400-5V Step-Up”.
- PresidentOfAwesomeness | about 2 years ago 1
  
  The minimum supply voltage is 7 volts, and the maximum is 25 volts. It says so in the datasheet. From experience I know that the performance will be eractic when supplying it lower than 7 volts.
SiliconValet | about 2 years ago 1

AFAIK The difference in power entering and leaving these things is dissipated as heat. Most of these things can only dissipate so much (7805A maxes out at 2.7W) Which means that although you can feed them 25V, you limit the current you can pass through unless you’ve got some wacky cooling.
- Electrical Juggernaut | about a year ago 1
  
  On a recent project, I had mine cooled to -85°C with LN2, had about 8 to 10 watts and it worked fine ;) Does that qualify as wacky cooling?
  - razor_sparks | about a year ago 2
    
    Yes. LN2 counts as wacky 80% of the time :)
Member #184519 | last year * 1

Which caps should I use with this regulator? If I want a realy stable supply?
In the data scheet they use a 0.33 uF and 0.1 uF.
And here http://www.arduino.cc/en/Main/Standalone are they useing 2 10 uF capacitors.
- sethborders | about 11 months ago 1
  
  I’m speculating here, but I think the best capacitance depends on how much current you need to supply. If your capacitance is too low compared to your current, then your supply wont be stable, but if the capacitance is too high compared to your current, then you wont be able to charge the caps up to the right voltage.
  - ATtiny Fan | last month * 1
    
    I use a standard circuit which has the 7805, a 10uF on Input and 1uF on output. Most of these different capacitor setups will work most of the time.
Member #249872 | about 9 months ago 1

So can I use this if I have an 12v analog signal? I want to connect it to IOIO for android DEV-10748.
Member #129214 | about 7 months ago 1

I’m driving one with a 16V supply. I drilled a hole in a quarter and bolted it to the 7805, and it’s been stable for at least 2 weeks.
Member #133003 | about 5 months ago 1

You should keep in mind that the quiescent current on this is very high at around 5-10mAh depending on input voltage. I found out the hard way that it chews through batteries.
LineKernel | about 2 months ago 1

how can i calculate the capacitor needed in my system ? i want to power a attinny from a 12v 2A led strip power supply , and use the attinny as the controler for the strip . is the capacitor value really important ? or anything between 0.1 to 10 uF will do ?

will it be really hot , heat wise ? should i use another regulator ?
- ATtiny Fan | last month 1
  
  Using between 1-10uF is common. As for the heat, you may have to use a heatsink being that it is using a 12V source. What kind of current draw will your ATtiny setup use?
Electro | about 2 weeks ago 1

I was on Digikey and found this awesome replacement: V78xx Switching Regulators