Part Number: ATTINY85-20SUR

Manufacturer: Microchip Technology

Description: IC MCU 8BIT 8KB FLASH 8SOIC

Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of ATTINY85-20SUR

Datasheet  ATTINY85-20SUR datasheet
Category Integrated Circuits (ICs)
Family Embedded – Microcontrollers
Manufacturer Atmel
Series AVR? ATtiny
Packaging Tape & Reel (TR)
Part Status Active
Core Processor AVR
Core Size 8-Bit
Speed 20MHz
Connectivity USI
Peripherals Brown-out Detect/Reset, POR, PWM, WDT
Number of I/O 6
Program Memory Size 8KB (4K x 16)
Program Memory Type FLASH
EEPROM Size 512 x 8
RAM Size 512 x 8
Voltage – Supply (Vcc/Vdd) 2.7 V ~ 5.5 V
Data Converters A/D 4x10b
Oscillator Type Internal
Operating Temperature -40°C ~ 85°C (TA)
Package / Case 8-SOIC (0.209″, 5.30mm Width)
Supplier Device Package 8-SOIC

ATTINY85-20SUR Introduction

The ATTINY85-20SUR microcontroller is a small, capable, 8-bit AVR microcontroller designed for low power consumption and compact applications. It has 8KB of flash memory, a clock speed of 20MHz, and several communication interfaces and peripherals.

This article aims to provide a detailed guide to the ATTINY85-20SUR microcontroller, including its features, architecture, and specifications. The essay will also examine its applications, benefits, and limits, offering important information for anyone interested in learning about or using this microcontroller in their projects.


The ATTINY85-20SUR microcontroller is a CMOS 8-bit AVR improved RISC architecture with reduced power consumption. The ATTINY85-20SUR reaches throughputs close to 1 MIPS per MHz by executing strong instructions in a single clock cycle, this enables the system designer to optimize power usage versus processing performance.

The AVR core includes a large instruction set and 32 general-purpose working registers. The ALU is integrated with all 32 registers, allowing the execution of a single instruction that accesses two separate registers in a single clock cycle. The resulting design is more code efficient, providing up to ten times quicker throughput than traditional CISC microcontrollers.

The register values are saved during the power-down mode, which turns off all chip functionality until the next Interrupt or Hardware Reset occurs. The device is made with high-density non-volatile memory technology from Atmel.

The On-chip ISP Flash enables In-System reprogramming of the Program memory through an SPI serial port or an On-chip boot code running on the AVR core. A comprehensive program and system development tools, including macro assemblers, C compilers, program debuggers/simulators, and evaluation kits, support the ATTINY85-20SUR AVR.


  • The AVR ATTINY85-20SUR is an 8-bit microcontroller with a 20MHz clock and 8KB flash memory. It also supports functional safety (FuSa), making it appropriate for safety-critical applications. The low power consumption of this microcontroller makes it excellent for battery-powered applications.
  • The ATTINY85-20SUR features some low-power modes, including idle, standby, and power-down modes, dramatically minimizing power consumption. It also has a large operating voltage range, ranging from 1.8V to 5.5V, allowing for various power supply options.
  • The ATTINY85-20SUR’s functional safety (FuSa) characteristics make it an excellent choice for safety-critical applications. It supports hardware- and software-based safety features, such as watchdog clocks, memory protection, and error correction.
  • In addition to its low power consumption, the ATTINY85-20SUR includes advanced power-saving modes that can extend battery life even further. This makes it an excellent solution for applications where power efficiency is crucial, such as portable devices and IoT sensors.
  • The ATTINY85-20SUR also has functional safety (FuSa) features. It has been built to meet the high safety criteria of numerous industry standards, making it appropriate for use in safety-critical applications such as automotive systems, industrial control equipment, and medical devices.
  • The ATTINY85-20SUR microcontroller also has advanced functions such as a 10-bit ADC, a UART, an SPI, and a PWM, allowing for diverse communication and control. Furthermore, its functional safety (FuSa) features make it an excellent solution for safety-critical applications like automotive, industrial, and medical equipment.
  • The ATTINY85-20SUR’s low power consumption is one of its major features, making it suited for battery-powered applications. It offers a power-down mode that reduces power usage to as little as 0.1A, allowing for longer battery life. As a result, it’s ideal for wearable devices, remote sensors, and other low-power applications.
  • In addition to its low power consumption, the ATTINY85-20SUR supports functional safety (FuSa), making it an excellent solution for applications requiring high reliability and safety standards. It has been certified by the International Electrotechnical Commission (IEC) for functional safety up to Safety Integrity Level 2 (SIL2), making it appropriate for use in safety-critical applications.
  • Another feature of the ATTINY85-20SUR is its tiny form factor, which makes it excellent for applications with limited space or where size is crucial. Furthermore, it is inexpensive, making it a viable alternative for amateurs and experts.
  • The tiny size of the ATTINY85-20SUR microcontroller makes it excellent for use in small form factor devices when space is constrained. It is also inexpensive, making it an appealing option for hobbyists, manufacturers, and small-scale production runs.

Overall, the ATTINY85-20SUR is a strong and adaptable microcontroller with various capabilities appropriate for various applications. It is a fantastic solution for battery-powered and safety-critical applications due to its low power consumption, innovative power-saving modes, and functional safety capabilities.


Because of its tiny form factor and inexpensive cost, the ATTINY85-20SUR microcontroller can be used in various applications. Home automation, wearable gadgets, and different Internet of Things (IoT) applications are some common applications.

The ATTINY85-20SUR’s functional safety features, which make it appropriate for safety-critical applications such as medical devices and automotive systems, are one of its key advantages. Furthermore, its tiny size and low power consumption make it perfect for battery-powered and portable applications.

The ATTINY85-20SUR can control lighting, temperature, and security systems, among other things, in home automation. It can also collect and interpret data from multiple sensors in wearable devices like fitness trackers and smartwatches.

The ATTINY85-20SUR can be used in sensors and actuators in IoT applications to link objects to the internet and let them communicate with one another. It’s low cost and small size makes it a popular choice for IoT projects requiring a simple microcontroller.

The ATTINY85-20SUR microcontroller is a versatile and dependable alternative for various applications, especially those requiring functional safety and low power consumption.


In conclusion, the ATTINY85-20SUR microcontroller offers a range of features that make it a versatile and cost-effective option for various applications. We have discussed its specifications, applications, and advantages, including its small form factor, low cost, and functional safety capabilities. If you’re interested in using the ATTINY85-20SUR in your own projects, we recommend setting up a development environment and exploring the available software tools and libraries.

At ICRFQ, we offer the ATTINY85-20SUR and other electronic components at competitive prices, backed by expert support from our knowledgeable staff. Whether you’re looking to purchase this microcontroller or any other electrical component, we can help you find the best items for the success of your project. Contact us today to learn more and get started.

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