Hi again Andy , A whole sq cm ? That is not so bad. An SO8 and a zener would find room. Not knowing your product, and how this PCB is to be used, I am not joking, as I suggest that you should look for a 1x1 cm cooler. Maybe 6 - 8 mm high. Just guessing - but a block like that (with small "fins" of course) would just get luke warm at 2 Watts. That's how I would look at it. Such coolers are available. And again - 2 Watts is always 2 Watts. Whatever the compmonent. Color, material and size counts. But again - I don't know if that is to tall, impossible to affix, or whatever. Depending on quantity, a custom designed cooler might be a solution. Best Regards Sven -----Ursprungligt meddelande----- FrŒn: Andy Kunz Till: PICLIST@MITVMA.MIT.EDU Datum: den 14 maj 1999 22:04 €mne: Re: SV: voltage regulator question >>The TL317CD is the SO8 version of a LM317 regulator. Max 40 V and 100 mA, >>but - I guess it ould run too hot... > >Thnks. I'll check. > >>You don't have room to help this little fellow out do you ?; with a zener >>in series to the input or soething ? > >Room? It's about 1cm square. A Zener would be possible, but it'll still >be warm. > >>Anyway - just look at the size of a SO8 product. Whatever it contains, it >>needs thermal assistance with black aluminium somehow in my opinion. Can you >>fit a cooler on top ? > >Cooler? HA! > >Andy > >================================================================== > Montana Design Tech Support - http://www.montanadesign.com >================================================================== >