Electronics guys - Need help identifying component manufacturer logo

[Spook50]

Trying to find the exact specs and tolerances of this voltage regulator. I haven't been able to find a matching manufacturer on any of the major distribution sites (Jameco, Digikey, Mouser, etc.), so hopefully maybe one of you guys recognize the logo printed on it:



It got alot hotter than I expected when I put a 300mA draw on it, so I'm trying to find out who makes it so I can get the data sheet and find out if it'll work for a project I'm in the prototype stage for with a heatsink, or if I'll be better off sourcing a different spec regulator.

 

[Cracker]

I used to work for a communications company building circuit boards for military communications systems, and I know I've seen that logo before, but dont remember the manufacturer.

EDIT:
Actually, here you go:
Matsushita/Panasonic

http://www.elnec.com/support/ic-logos/manufacturer-description/?manuf=Matsushita+Panasonic

I couldnt find a datasheet specific to Matshushita/Panasonic, but Panasonic and Matsushita each have separate sheets for their respective versions....???

 

[george_tlc]

It's a 5V linear regulator. Any extra 'voltage' (Input Voltage - 5V) will be turned into heat.

So, assuming you have 12V in then (12V - 5V) x 0.3A = 2.1W being dissipated.

There's a reason switching regulators are a good idea for many applications...

Looks like a TO220 style package The 7805 from various manufactures are all basically clones of each other.

http://www.fairchildsemi.com/ds/MC/MC78M05.pdf is as good as any to use as a datasheet.

cheers,
george.

 

[rusty_tlc]

Edit, George beat me to it.

You will need a heat sink to run the TO-220 package at 300mA

http://pdf.datasheetcatalog.com/datasheet/panasonic/AN78M20F.pdf

In general the 7805 regulator has been around since the 80's it's old technology, very inefficient. I'd find a different device to use.


You can use a tool like webench to select a device and design the circuit.

http://www.ti.com/lsds/ti/analog/webench/overview.page

 

[Spook50]

Awesome, thanks guys. It looks like the TO-220F form factor VRs have fairly similar characteristics when their input & output voltages and the load on them are the same. Be great if I could use a TO-92 regulator in this design, but the current draw under normal use is too high for one of those.

Rusty, depending on size and how solidly it holds a 5VDC output among fluctuations of 10VDC-14VDC, I'm thinking you're right and a different style regulator is in order. Time to do some more research...

Edit: I see George already beat me to what I was thinking about the 220s....

 

[rusty_tlc]

In the same family as the LM78XX regulators is the LM317. Also old technology but fun to play with. If you search on applications for the LM317 you will find a ton of stuff.

 

[Spook50]

In the same family as the LM78XX regulators is the LM317. Also old technology but fun to play with. If you search on applications for the LM317 you will find a ton of stuff.

Yeah I've seen a buttload of projects on Youtube and other sites centered around the 317. I think a couple of our projects next quarter even use it.

No luck finding a suitable alternative to the 7805 for what I'm doing. At least, nothing that can come close to what I need as far as physical size, operating parameters and availability that can even come close in cost to a 7805 with an added heat sink (hell even two heat sinks to sandwich it only add a few cents to the overall cost). Looks like I'll be looking into what the smallest heat sink I can get away with using will be (the less space taken up the better).

 

[rusty_tlc]

If you follow the link I gave you it will take you to a site that will make device recommendations based on your parameters and do circuit simulations. It will also allow you to order free samples, tough to beat free for cost.

 

[Spook50]

If you follow the link I gave you it will take you to a site that will make device recommendations based on your parameters and do circuit simulations. It will also allow you to order free samples, tough to beat free for cost.

I took a peek at it. Didn't have much time to really familiarize myself with it, but I'm planning to spend some more time figuring it out tonight.