We detect you are using an unsupported browser. For the best experience, please visit the site using Chrome, Firefox, Safari, or Edge. X

Designed for Demanding Analog Applications

The AVR® DB family builds upon the low-power performance of the AVR core with a world-class selection of Core Independent Peripherals (CIPs) and a fully loaded Intelligent Analog portfolio, giving you the freedom to design tomorrow’s solutions today. Featuring three on-chip operational amplifiers (op amps), this family is unparalleled in its signal conditioning capabilities. With its Multi-Voltage I/O (MVIO), the AVR DB is a perfect companion microcontroller (MCU) in complex designs with multiple power domains.

This family of MCUs leverages on-board CIPs and a 5V operation mode for increased noise immunity while also reducing system latency by making use of the powerful Event System and Configurable Custom Logic (CCL) peripherals. The AVR DB family’s MVIO allows true level-shifted bi-directional communication with devices on a different power domain. You can use the AVR DB family for real-time control functions in industrial control, home appliance, automotive, Internet of Things (IoT) and other applications.

Getting Started

The AVR128DB48 Curiosity Nano Evaluation Kit is the ideal platform for rapid prototyping with AVR DB MCUs. This USB-powered kit features an on-board programmer/debugger that seamlessly integrates with MPLAB® X and Microchip Studio Integrated Development Environments (IDEs). Its small form factor makes the board excellent for breadboard soldering, or you can combine it with the Curiosity Nano Base for Click boards™, which features multiple mikroBUS™ sockets so you can easily add sensors, actuators or communications interfaces from Mikroelektronika’s extensive selection of Click boards.

*This board is based on the 128 KB 48-pin AVR DB MCU. An evaluation kit with the 64-pin AVR DB is not available.

Functional Safety Ready for Safety-Critical Applications

The AVR DB family is recommended for safety-critical applications targeting both industrial and automotive products (IEC 61508 and ISO 26262). We also offer the  MPLAB XC8 Functional Safety Compiler License, which is a TÜV SÜD certified compiler package that supports 8-bit PIC® and AVR microcontrollers. Documents such as FMEDA reports and safety manuals are available on request. Please contact your local Microchip sales office or your distributor for more information.

System Features

Family Offering (Pin Count vs. Memory)

Flash (KB)

28 Pins

32 Pins

48 Pins

64 Pins







In Production






Future Product






Future Product

Key Features

  • Internal 24 MHz oscillator
  • Up to 16 KB SRAM
  • Up to 22-channel, 130 ksps 12-bit differential Analog-to-Digital Converter (ADC)
  • 10-bit 350 ksps Digital-to-Analog Converter (DAC)
  • Analog signal conditioning (OPAMP)
  • Analog Comparator (AC) with scalable reference input
  • Up to three Zero-Cross Detectors (ZCDs)
  • Cyclic Redundancy Check (CRC) scan


  • Clock Failure Detect
  • 16-bit Real Time Clock (RTC) and periodic interrupt timer
  • Configurable Custom Logic (CCL) peripheral
  • Up to 10-channel Event System peripheral
  • Configurable, internally generated reference voltage
  • USART/SPI/dual-mode Two-Wire Interface (TWI)
  • Multi-voltage I/O on Port C
  • 1.8V tolerant inputs selectable for all input pins

AVR DB Products

View All Parametrics
Product Program Memory Size (KB) RAM (KB) Pin Count 5k Pricing Number of Op Amps Diff ADC Inputs
AVR128DB28 128 16384 28 1.1900 2 Yes
AVR128DB32 128 16 32 1.3000 2 Yes
AVR128DB48 128 16 48 1.4000 3 Yes
AVR128DB64 128 16384 64 1.6100 3 Yes