# Which ATmega328 (blank) from DigiKey? **URL:** \ **Category:** 3rd Party Boards\ **Created:** [July 30, 2012, 3:54pm UTC](https://forum.arduino.cc/t/which-atmega328-blank-from-digikey/114119 "2012-07-30T15:54:51Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [July 30, 2012, 3:54pm UTC](https://forum.arduino.cc/t/which-atmega328-blank-from-digikey/114119/1 "2012-07-30T15:54:51Z")
I've tried to research the difference between the [ATmega328P-PN](http://www.digikey.com/product-detail/en/ATMEGA328P-PN/ATMEGA328P-PN-ND/2357094) and the [ATmega328P-PU](http://www.digikey.com/product-detail/en/ATMEGA328P-PU/ATMEGA328P-PU-ND/1914589). I've read through the datasheet and done a bunch of searching. I think there is some difference regarding operating temperature range and possibly power consumption. Now that I can burn my own boot-loaders I wanted to buy some blank ATmega328 chips from Digikey, but have held back because I read something about the "fuse" settings being different between different versions. I'm wanting to burn the Uno or Duemilanove boot-loaders on the chips, it doesn't matter which. If I could be confident about the correct DigiKey part to order I'd get 25 of them and take advantage of the quantity discount. Thanks for any help in ordering the correct chip. Jake ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [July 30, 2012, 4:13pm UTC](https://forum.arduino.cc/t/which-atmega328-blank-from-digikey/114119/2 "2012-07-30T16:13:44Z")
I think the N version has a higher operating temperature. If you get the 328p-pu (your second link) you'll have the same chip that's in the Uno and Duemilanove, so you should be able to burn their bootloaders to blank chips with no fuse changes. Gold luck! ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [July 30, 2012, 4:24pm UTC](https://forum.arduino.cc/t/which-atmega328-blank-from-digikey/114119/3 "2012-07-30T16:24:43Z")
Thanks for the clarification! ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [July 30, 2012, 5:16pm UTC](https://forum.arduino.cc/t/which-atmega328-blank-from-digikey/114119/4 "2012-07-30T17:16:41Z")
FWIW, The chip's that I ordered from sparkfun are 328P-PU with a #1107 on them. They work fine with no fuss but I have to chose one of the older boards in the menu. The chip that came in my UNO has a # 1123 on it. ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [July 30, 2012, 5:34pm UTC](https://forum.arduino.cc/t/which-atmega328-blank-from-digikey/114119/5 "2012-07-30T17:34:08Z")
Thanks Hoff, that helps. ---
**Author:** ![CrossRoads](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/crossroads/32/214033_2.png) [@CrossRoads](https://forum.arduino.cc/u/CrossRoads)\ **Post date:** [July 30, 2012, 5:51pm UTC](https://forum.arduino.cc/t/which-atmega328-blank-from-digikey/114119/6 "2012-07-30T17:51:39Z")
Datasheet dated Rev. 8271D–AVR–05/11 for: ATmega48A ATmega48PA ATmega88A ATmega88PA ATmega168A ATmega168PA ATmega328 ATmega328P Section 33.8 ATmega328P: ATmega328P-PU Industrial (-40°C to 85°C) ATmega328P-PN Industrial (-40°C to 105°C) ---
**Author:** ![MarvinMartian](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/marvinmartian/32/213663_2.png) [@MarvinMartian](https://forum.arduino.cc/u/MarvinMartian)\ **Post date:** [July 31, 2012, 12:02pm UTC](https://forum.arduino.cc/t/which-atmega328-blank-from-digikey/114119/7 "2012-07-31T12:02:15Z")
> hoff70: > FWIW, > > The chip's that I ordered from sparkfun are 328P-PU with a #1107 on them. They work fine with no fuss but I have to chose one of the older boards in the menu. The chip that came in my UNO has a # 1123 on it. Those extra numbers are manufacture dates in the form 7th (or 23rd) week of 2011 - this is a common stardard on most components. ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [May 6, 2021, 4:45pm UTC](https://forum.arduino.cc/t/which-atmega328-blank-from-digikey/114119/8 "2021-05-06T16:45:42Z")