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2x ATMEL ATTINY85-20PU 8-BIT 20MHz MCU

4.5 out of 5 stars 42 ratings
$11.99
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Purchase options and add-ons

Brand Atmel
CPU Manufacturer Atmel
CPU Speed 20 MHz
CPU Socket DIP
Platform Not Machine Specific

About this item

  • 8 Bit Data Bus
  • 20 MHz Max Clock Frequency ( w/ external crystal )
  • 8 kB Program Memory Size
  • 2.7 V to 5.5 V Operating Supply Voltage
  • 6 I/O Pins
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2x ATMEL ATTINY85-20PU 8-BIT 20MHz MCU
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Product information

Package Dimensions 3.1 x 3.1 x 0.5 inches
Item Weight 0.353 ounces
Manufacturer Atmel
ASIN B00PT4XU04
Item model number ATTINY85-20PU
Customer Reviews
4.5 out of 5 stars 42 ratings

4.5 out of 5 stars
Best Sellers Rank
Is Discontinued By Manufacturer No
Date First Available November 18, 2014

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Product Warranty: For warranty information about this product, please click here

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2x ATMEL ATTINY85-20PU 8-BIT 20MHz MCU

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Product Description

If you need a MCU with high performance at low power this is the MCU for you. This Atmel 8-bit AVR RISC-based microcontroller combines 8KB ISP flash memory, 512B EEPROM, 512-Byte SRAM, 6 general purpose I/O lines.

Customer reviews

4.5 out of 5 stars
42 global ratings

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Customers say

Customers find the microcontroller works well, particularly with 595 shift registers, and appreciate its amazing quality and value, noting it's cheaper than dedicated Arduino boards. They describe it as a great mini controller that's fun to play with, and one customer mentions it performs even in heat. While customers find it easy to program, some note the lack of included instructions.

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FunctionalityQualityValue for moneyController sizeFun to play withSizeEase of use
7 customers mention "Functionality"7 positive0 negative

Customers report that the processor works well, with one mentioning it performs effectively with 595 shift registers, and another noting it maintains performance even in heat.

"...Nonetheless, i got everything working with enough work. Recommended, these get any small controller-job done that's fairly basic at that." Read more

"...Was really worried about destroying the internals.. Worked out very nice and did a great job for my standalone laser tripwire project!..." Read more

"...I've been using em in diy outdoor pir sensors and they work find even in heat. A little expensive but it's the price you pay for non wholesale." Read more

"These were easy to program with the Arduino as an ISP. Worked well with 595 shift registers. Very cool for projects needing 5 pins or less." Read more

7 customers mention "Quality"7 positive0 negative

Customers find the processor to be amazing.

"I love these things. They are amazing, but Atmel... you need to work on your shipping...." Read more

"...They're awesome. You can't put huge programs into them, but most limited I/O sketches aren't that complicated. And they're cheap. Really cheap...." Read more

"...Great little device and must have for hobbyists. At the cost you can not go wrong to have a bunch of these on the shelves...." Read more

"great chips and cheaper than dedicating an entire arduino board. The came with no bent pins...." Read more

4 customers mention "Value for money"4 positive0 negative

Customers find the processor offers good value for money, being cheaper than using an entire Arduino board, with one customer noting there's no wasted hardware.

"...And they're cheap. Really cheap. A full-on Arduino Uno (from Arduino) is around US$35. One of these is under $3. Can't beat that with a stick...." Read more

"Work great, good condition. What else can I say? I've been using em in diy outdoor pir sensors and they work find even in heat...." Read more

"...Smaller, cheaper, no wasted hardware. Power it with 3 AAA batteries and you don't need a voltage regulator. Use an LM7805 for 9 volt battery projects." Read more

"great chips and cheaper than dedicating an entire arduino board. The came with no bent pins...." Read more

3 customers mention "Controller size"3 positive0 negative

Customers appreciate the microcontroller's size, describing it as a great mini controller.

"...Recommended, these get any small controller-job done that's fairly basic at that." Read more

"Great mini controller, here for a high price. They do not withstand conditions beyond their maximum operating values very well...." Read more

"Very handle little micro controllers." Read more

3 customers mention "Fun to play with"3 positive0 negative

Customers find the processor fun to play with, with one mentioning it's great for Arduino projects.

"As advertised. I'm sure they'll be fun to play with." Read more

"Small fun chips for shrinking down an arduino project" Read more

"Great little chips for Arduino projects..." Read more

3 customers mention "Size"3 positive0 negative

Customers appreciate the processor's compact size, with one mentioning it is both tiny and powerful.

"...do sophisticated processing (albeit in small chunks), and are tiny on a breadboard...." Read more

"...Use your arduino as an ISP to program this chip instead. Smaller, cheaper, no wasted hardware...." Read more

"Very tiny yet powerful!..." Read more

5 customers mention "Ease of use"3 positive2 negative

Customers have mixed experiences with the processor's ease of use: while some find it easy to program, others report that no instructions are included.

"...These little guys sip power, do sophisticated processing (albeit in small chunks), and are tiny on a breadboard...." Read more

"...Only irritation was ease of use with the related software, and the fact that you need to order a compatible USB adapter in order to load in the code...." Read more

"...The pins have standard spacing so it is easy to make a programmer board for them. I had fast shipping with this product...." Read more

"These work very well but no instructions included so hopefully you have some background in AVR programming/microcontrollers because you will need it." Read more

Great little chips for Arduino projects
5 out of 5 stars
Great little chips for Arduino projects
Excellent quality, all 6 I purchased worked flawlessly. Video shows three of them running the "Blink" example (100 ms) at 1 Mhz (internal), 8 Mhz (internal) and 16 Mhz (external, with crystal and 2 pF ceramic disc capacitors). I didn't try their ability to reach those using internal High Frequency PLL Clock, though. I'll definitely buy more from this vendor when needed.
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Top reviews from the United States

  • Mats SM.
    5.0 out of 5 stars Does the job, even if tricky at that.
    Reviewed in the United States on November 26, 2018
    Verified Purchase
    I ordered 2 of them for my little gamecube RGB mod project, and it worked flawlessly. Only irritation was ease of use with the related software, and the fact that you need to order a compatible USB adapter in order to load in the code. The loading itself, i wish was more streamlined or rather had a proper UI. Nonetheless, i got everything working with enough work. Recommended, these get any small controller-job done that's fairly basic at that.
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  • zack
    3.0 out of 5 stars They’re great but atmel needs better logistics
    Reviewed in the United States on September 7, 2018
    Verified Purchase
    I love these things. They are amazing, but Atmel... you need to work on your shipping. The pins on both of my ICs were bent so bad and so many times they were almost broken off. I had to be so careful when installing them in my project so they wouldn’t just fall off.
    One person found this helpful
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  • Xaetognath
    5.0 out of 5 stars You don't like the idea of sacrificing a whole Nano or Mini
    Reviewed in the United States on June 9, 2015
    Verified Purchase
    Sometimes, you don't want a whole Arduino for a simple project. Maybe you just want a few LEDs or a simple "smart" switch. You don't like the idea of sacrificing a whole Nano or Mini, or even their miniscule footprint is too large. Maybe you don't want a couple of crystals and a bunch of resistors and capacitors to run a hand-built Arduino.

    Then this is for you. Hook it up, add only 3 wires*, and you're golden for operation. These babies will give you up to 5 digital I/O ports, or a combination of digital I/O, up to 2 PWM, or up to 3 Analog in! They're awesome. You can't put huge programs into them, but most limited I/O sketches aren't that complicated. And they're cheap. Really cheap. A full-on Arduino Uno (from Arduino) is around US$35. One of these is under $3. Can't beat that with a stick. So don't try. (Seriously, don't beat them with a stick. No point, really. They're solid state, and won't get the point.) If you buy them in bulk, you can get them close to $1 each, with $0 shipping, either from Atmel, or one of their dealers.

    These little guys sip power, do sophisticated processing (albeit in small chunks), and are tiny on a breadboard. Plus, they're a hundred times more brutal than Lego on the floor for discouraging cat burglars and sleep walkers. Seriously, you step on the upturned pins of a handful of these and you'll wish you had picked a different house. You don't even know how much you love these yet, but you will. Buy them and put them in your project or on your floor today!

    * programming takes considerably more than 3 wires, but once programmed, you many disconnect them.
    37 people found this helpful
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  • EleBuyer
    5.0 out of 5 stars Very tiny yet powerful!
    Reviewed in the United States on November 6, 2016
    Verified Purchase
    I'm a newbie solderer, I solder this directly to wires..
    Was really worried about destroying the internals..
    Worked out very nice and did a great job for my standalone laser tripwire project!

    But I might buy ATmega328p-pu next time cuz those I/O pins were not enough for slightly larger projects..
    Only 5 I/Os, vcc, grd and reset pin...(If i use reset pin to act as I/O, I could not re-program it easily with arduino i think)
    Shift registers will do but makes everything complicated.
    Hope Atmel would sell those too!
    One person found this helpful
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  • czaky
    4.0 out of 5 stars Great mini controller
    Reviewed in the United States on September 22, 2015
    Verified Purchase
    Great mini controller, here for a high price.
    They do not withstand conditions beyond their maximum operating values very well.
    Better read the manual first.
    2 people found this helpful
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  • AG
    5.0 out of 5 stars This is a must have chip!
    Reviewed in the United States on August 4, 2015
    Verified Purchase
    This device is exactly what I would expect from Atmel. It has a 20MHz clock speed as promised.
    I was finding that on mid range clock speeds it only cost me like 500 micro amperes.
    It is pretty easy to program if you have an Arduino to act as an ISP.

    Great little device and must have for hobbyists. At the cost you can not go wrong to have a bunch of these on the shelves. The pins have standard spacing so it is easy to make a programmer board for them.

    I had fast shipping with this product. and they came as shown in the advertisement.
    They were packaged in a standard quality anti-static bag .
    7 people found this helpful
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  • James R Goble
    3.0 out of 5 stars You can do better.
    Reviewed in the United States on July 11, 2017
    Get the Curiosity HPC with PIC16F18875 MPC. Much more capable 8-bit microcontroller, with 36 I/O channels.
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  • Mike Galaxy
    5.0 out of 5 stars Works as expected.
    Reviewed in the United States on December 12, 2019
    Verified Purchase
    Work great, good condition. What else can I say? I've been using em in diy outdoor pir sensors and they work find even in heat. A little expensive but it's the price you pay for non wholesale.
    Helpful
     Report