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HomeProductsIntegrated Circuits (ICs)Embedded - MicrocontrollersATTINY44-20MUR
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ATTINY44-20MUR - Microchip Technology

Manufacturer Part Number
ATTINY44-20MUR
Manufacturer
Microchip Technology
Allelco Part Number
32D-ATTINY44-20MUR
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
15,109 pcs available, New & Original
Parts Description
IC MCU 8BIT 4KB FLASH 20QFN
Package
20-QFN-EP (4x4)
Data sheet
ATTINY44-20MUR.pdf

PCN Assembly/Origin

2.73KHz.pdf

PCN Other

2.73KHz.pdf
RoHs Status
ROHS3 Compliant
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In stock: 15109

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Specifications

ATTINY44-20MUR Tech Specifications
Microchip Technology - ATTINY44-20MUR technical specifications, attributes, parameters and parts with similar specifications to Microchip Technology - ATTINY44-20MUR

Product Attribute Attribute Value
Manufacturer Microchip Technology
Voltage - Supply (Vcc/Vdd) 2.7V ~ 5.5V
Supplier Device Package 20-QFN-EP (4x4)
Speed 20MHz
Series AVR® ATtiny
RAM Size 256 x 8
Program Memory Type FLASH
Program Memory Size 4KB (2K x 16)
Peripherals Brown-out Detect/Reset, POR, PWM, WDT
Package / Case 20-WFQFN Exposed Pad
Package Tape & Reel (TR)
Product Attribute Attribute Value
Oscillator Type Internal
Operating Temperature -40°C ~ 85°C (TA)
Number of I/O 12
Mounting Type Surface Mount
EEPROM Size 256 x 8
Data Converters A/D 8x10b
Core Size 8-Bit
Core Processor AVR
Connectivity USI
Base Product Number ATTINY44

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.31.0001

Parts Introduction

ATTINY44-20MUR Image
ATTINY44-20MUR (1)

Manufacturer Part Number

ATTINY44-20MUR

Manufacturer

Microchip Technology

Introduction

The ATTINY44-20MUR is an AVR® ATtiny series 8-bit microcontroller designed for high-performance, low-power computing needs, provided in a compact 20-QFN-EP surface mount package.

Product Features and Performance

Core Processor: AVR 8-Bit

Speed: 20 MHz

Connectivity: USI (Universal Serial Interface)

Peripherals: Brown-out Detect/Reset, Power-On Reset, Pulse Width Modulation, Watchdog Timer

Number of I/O: 12

Program Memory: 4KB FLASH

EEPROM: 256 x 8

RAM: 256 x 8

Data Converters: 8-channel 10-bit Analog-to-Digital converter

Oscillator: Internal

Operating Temperature Range: -40°C ~ 85°C

Product Advantages

Integrated features to handle system-level brownouts and power resets enhancing overall system robustness.

Wide voltage supply range (2.7V to 5.5V) makes it suitable for a variety of applications.

Compact footprint and surface mount package for space-sensitive applications.

Key Technical Parameters

Flash Memory: 4KB (2K x 16)

RAM: 256 Bytes

EEPROM: 256 Bytes

10-bit ADC with 8 channels

PWM Channels

Watchdog Timer

Quality and Safety Features

Brown-out Detect/Reset ensures proper operation under low voltage conditions.

Operates stably within a temperature range of -40°C to 85°C.

Compatibility

Compatible with USI communication for connectivity with other digital systems.

Application Areas

Consumer Electronics

Industrial Control

Automotive Systems

IoT Devices

Product Lifecycle

Currently status: Active

Not nearing discontinuation and expected to have continued availability along with potential upgrades.

Several Key Reasons to Choose This Product

High-speed 20 MHz performance for timely computing and processing.

Extensive memory and peripherals reduce additional component needs.

Robust data converters for accurate analog to digital data handling.

Reliable operation across a wide range of environmental conditions.

Surface-mount technology facilitating smaller, compact designs.

Frequently Asked Questions(FAQ)

What is the optimal operating voltage range for the ATTINY44-20MUR microcontroller in low-power battery-powered applications?
The ATTINY44-20MUR operates reliably within a supply voltage range of 2.7V to 5.5V, making it suitable for systems powered by alkaline or rechargeable batteries. At lower voltages near 2.7V, internal oscillator accuracy may decrease slightly, and maximum speed drops below 20MHz. For extended battery life, designs should maintain Vcc above 3.0V to ensure stable ADC performance and reliable I/O operation across temperature extremes.
How does the ATTINY44-20MUR compare to the ATTINY84-20PU in terms of pin count and package footprint when migrating from DIP to surface-mount designs?
The ATTINY44-20MUR uses a 20-pin QFN-EP (4x4mm) package with an exposed pad, offering a 65% smaller footprint than the ATTINY84-20PU’s 20-pin PDIP. While both share identical core architecture, memory capacity, and peripheral sets, the QFN package enables higher pin density but requires careful thermal management during soldering. The ATTINY44-20MUR also supports USI functionality, which can replace SPI/I2C in space-constrained layouts, whereas the PDIP version offers easier prototyping but lacks modern packaging advantages.
Can the ATTINY44-20MUR drive high-current loads directly from its GPIO pins, and what external components are needed for switching inductive loads?
No, the ATTINY44-20MUR has typical sink/source current per I/O pin limited to 40mA under normal conditions, with total port current not exceeding 100–200mA depending on configuration. To switch inductive loads such as relays or motors, an external MOSFET or transistor must be used. A common design employs a logic-level N-channel MOSFET like the IRLZ34N driven via a GPIO pin through a current-limiting resistor, ensuring flyback diodes are included to protect the circuit from voltage spikes generated by inductive kickback.
What clock source options are available on the ATTINY44-20MUR, and how do they affect power consumption and timing accuracy?
The ATTINY44-20MUR supports multiple internal clock sources: an 8MHz RC oscillator, a calibrated 1MHz/2MHz/4MHz/8MHz factory-trimmed oscillator, and a 128kHz ultra-low-power watchdog oscillator. For precise timing applications, the 8MHz internal oscillator can be calibrated using the device’s internal calibration routine, achieving ±1% accuracy over temperature and voltage. In sleep modes, switching to the 128kHz oscillator reduces dynamic current to microamps, enabling long battery life while maintaining watch functionality—critical for real-time clocks or duty-cycled sensor nodes.
Is the ATTINY44-20MUR suitable for automotive-grade temperature ranges, and what derating considerations apply to flash endurance at elevated ambient temperatures?
No, the ATTINY44-20MUR is specified only for industrial temperature grades (-40°C to +85°C), not full automotive AEC-Q100 compliance. Flash memory endurance decreases with increasing junction temperature; datasheet ratings assume 10,000 write cycles at room temperature. Operating continuously at 85°C may reduce endurance significantly unless write operations are infrequent or wear leveling is implemented in firmware. For harsh environments requiring >15-year lifespan, external non-volatile storage or redundant firmware sectors should be considered.
How many analog inputs does the ATTINY44-20MUR support, and can it simultaneously sample all channels without performance degradation?
The ATTINY44-20MUR includes eight 10-bit successive approximation ADC channels with programmable gain amplifiers and internal bandgaps. While all eight inputs can be sampled sequentially via software, simultaneous sampling is not supported. Sequential conversion takes approximately 13 ADC clock cycles per channel at full resolution. With a 20MHz system clock, this translates to ~1.3μs per sample. To avoid crosstalk or noise coupling, input channels should be multiplexed with sufficient delay, and decoupling capacitors must be placed close to the MCU’s AVCC pin to maintain SNR above 50dB in precision sensing applications.
What is the maximum allowable continuous current for the entire PORTB or PORTA on the ATTINY44-20MUR, and how does this impact motor control designs?
The ATTINY44-20MUR’s ports have combined current sourcing/sinking limits typically rated at 200mA per 8-bit port under steady-state conditions, though transient peaks up to 500mA are permitted briefly. However, exceeding 100mA on any single pin risks latch-up or permanent damage. In H-bridge motor driver circuits, individual FETs must be controlled via discrete transistors rather than direct port driving. Using optocouplers or gate drivers ensures isolation and current handling beyond the MCU’s native capabilities, preventing failure during back-EMF events.
How does the ATTINY44-20MUR handle brown-out detection during voltage droop, and what thresholds are available for critical system protection?
The ATTINY44-20MUR features configurable brown-out detection (BOD) that monitors Vcc and triggers a reset if the voltage falls below a predefined threshold. Three levels are available: 1.8V, 2.7V, or off. For stable operation at 2.7V minimum, selecting the 2.7V BOD level ensures clean resets during power-up or brownouts, preventing corrupted states. The BOD circuitry consumes negligible power and activates immediately upon startup, providing essential protection for unattended embedded systems where voltage instability could lead to erratic behavior or data loss.
Can the ATTINY44-20MUR emulate I2C communication using its USI module instead of dedicated hardware, and what limitations apply compared to standard TWI?
Yes, the ATTINY44-20MUR’s Universal Serial Interface (USI) can be configured to emulate I2C master or slave operation, offering flexibility when dedicated TWI peripherals are unavailable. However, timing accuracy depends on software loop delays and interrupt latency, making it less deterministic than hardware-based TWI. Maximum I2C speeds are limited to around 100–400kbps due to polling overhead. For robust multi-master bus topologies or high-speed sensors like MPU6050, dedicated TWI remains preferable; however, USI emulation suffices for simple EEPROM logging or basic sensor reads in cost-sensitive designs.
What programming interface does the ATTINY44-20MUR use, and what hardware modifications are required for in-circuit debugging?
The ATTINY44-20MUR supports in-system programming (ISP) via the standard 6-wire SPI interface (MOSI, MISO, SCK, RESET, Vcc, GND). Debugging typically requires external tools like Atmel-ICE or JTAGICE3, which connect via the same pins. Since the QFN package lacks visible access points, programming often necessitates flying wires or a bed-of-nails fixture. Alternatively, bootloader implementations using UART over USI can simplify reprogramming without removing the IC, reducing risk during development phases.
How much RAM and EEPROM does the ATTINY44-20MUR provide, and what partitioning strategy optimizes data logging applications?
The ATTINY44-20MUR contains 256 bytes of RAM and 256 bytes of EEPROM. Given these constraints, efficient memory management is critical. For data logging, circular buffering in RAM with periodic writes to EEPROM prevents overflow, while wear leveling spreads erase/write cycles across EEPROM sectors. Each byte typically endures 100,000 cycles, so storing large datasets requires compression or external FRAM. Firmware should minimize stack usage and avoid dynamic allocation to preserve heap space for runtime variables.
What is the typical start-up time for the ATTINY44-20MUR after power-on, and how does it affect system initialization sequences?
After power stabilization, the ATTINY44-20MUR requires approximately 65ms before full instruction execution begins, assuming a 1MHz internal oscillator is used. This includes PLL lock time (if enabled), oscillator stabilization, and internal calibration routines. During this period, interrupts are masked and peripherals remain inactive. System designers must delay critical tasks until the startup timer expires or rely on reset vectors that safely initialize peripherals post-boot, especially in safety-critical monitoring systems where premature operation could cause errors.
Does the ATTINY44-20MUR include a watchdog timer, and how can it be configured for soft reset recovery in fault-tolerant designs?
Yes, the ATTINY44-20MUR integrates a watchdog timer (WDT) with selectable timeout periods ranging from 16ms to 8s. In fault-tolerant designs, the WDT can periodically reset the MCU if firmware hangs, restoring normal operation. For best results, the ISR should clear the WDT early, and critical state flags should be preserved in RAM-backed registers or mirrored in non-volatile memory. Combined with brown-out detection, the WDT provides layered resilience against software crashes or electrical disturbances in unattended deployments.
Can the ATTINY44-20MUR generate PWM signals on all I/O pins, and what resolution is achievable with its 8-bit timers?
Not all 12 I/O pins support hardware PWM; only those connected to Timer/Counter modules can output modulated signals. The ATTINY44-20MUR has two 8-bit timers (Timer0 and Timer1), each supporting up to four PWM outputs. With prescaler settings, PWM frequency can range from sub-Hz to several MHz. At 20MHz clock and no division, PWM resolution is 8 bits (256 steps); adding a prescaler of 8 yields ~97.7kHz frequency with same resolution. For higher resolution (>10-bit), sigma-delta modulation via bit-banging or software PWM on other pins is possible but increases CPU load.

Parts with Similar Specifications

The three parts on the right have similar specifications to Microchip Technology ATTINY44-20MUR

Product Attribute ATTINY44-20MUR ATTINY44-20MU ATTINY44-20SSUR ATTINY44-20MU
Part Number ATTINY44-20MUR ATTINY44-20MU ATTINY44-20SSUR ATTINY44-20MU
Manufacturer Atmel Atmel Microchip Technology Microchip Technology
Series - - - -
Connectivity - - - -
Voltage - Supply (Vcc/Vdd) - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Oscillator Type - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
RAM Size - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Core Processor - - - -
EEPROM Size - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Number of I/O - - - -
Data Converters - - - -
Peripherals - - - -
Core Size - - - -
Program Memory Size - - - -
Program Memory Type - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Speed - - - -

ATTINY44-20MUR Datasheet PDF

Download ATTINY44-20MUR pdf datasheets and Microchip Technology documentation for ATTINY44-20MUR - Microchip Technology.

HTML Datasheet
ATtiny24/44/84 Datasheet.pdf ATtiny24/44/84 Summary.pdf
PCN Assembly/Origin
2.73KHz.pdf
PCN Design/Specification
Marking Chgs 11/Jul/2017.pdf Multiple Devices Copper Wire 20/Aug/2013.pdf
PCN Packaging
MBB/Label Chgs 16/Nov/2018.pdf Tape and Reel Label Update 10/Feb/2015.pdf
PCN Other
2.73KHz.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

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ATTINY44-20MUR Image

ATTINY44-20MUR

Microchip Technology
32D-ATTINY44-20MUR

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