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ATTINY44-20MU
Microchip Technology
IC MCU 8BIT 4KB FLASH 20QFN
15116 Pcs New Original In Stock
AVR AVR® ATtiny Microcontroller IC 8-Bit 20MHz 4KB (2K x 16) FLASH 20-QFN-EP (4x4)
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5.0 / 5.0
- (415 Ratings)
ATTINY44-20MU
Product Overview
1455955
DiGi Electronics Part Number
ATTINY44-20MU-DGManufacturer
Microchip Technology
ATTINY44-20MU
Description
IC MCU 8BIT 4KB FLASH 20QFNInventory
15116 Pcs New Original In Stock
AVR AVR® ATtiny Microcontroller IC 8-Bit 20MHz 4KB (2K x 16) FLASH 20-QFN-EP (4x4)
Quantity
Minimum 1
Minimum 1
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ATTINY44-20MU Technical Specifications
Category
Embedded, Microcontrollers
Packaging
-
Series
AVR® ATtiny
Product Status
Active
DiGi-Electronics Programmable
Verified
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number of I/O
12
Program Memory Size
4KB (2K x 16)
Program Memory Type
FLASH
EEPROM Size
256 x 8
RAM Size
256 x 8
Voltage - Supply (Vcc/Vdd)
2.7V ~ 5.5V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C (TA)
Mounting Type
Surface Mount
Supplier Device Package
20-QFN-EP (4x4)
Package / Case
20-WFQFN Exposed Pad
Base Product Number
ATTINY44
Datasheet & Documents
HTML Datasheet
ATTINY44-20MU-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.31.0001
Additional Information
Standard Package
490
Alternative Parts
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Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
사후 지원이 친절하고 신속해서 믿음이 갑니다. 가격도 투명해서 좋아요.
de desembre 02, 2025
I've had a fantastic experience with DiGi Electronics recently—excellent quality and very friendly support team.
de desembre 02, 2025
Their budget-friendly prices and helpful staff keep me coming back.
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Frequently Asked Questions (FAQ)
Can the ATTINY44-20MU replace an ATTINY24A-MU in an existing 3.3V sensor node design without firmware changes?
The ATTINY44-20MU can functionally replace the ATTINY24A-MU in many 3.3V applications due to its compatible pinout, voltage range (2.7V–5.5V), and enhanced memory (4KB Flash vs. 2KB), but firmware validation is required. While both use the same AVR core and support internal oscillators, differences in fuse bit defaults, peripheral register mappings (especially for USI and ADC), and power-on reset thresholds may cause unexpected behavior. Always recompile and test the code on the ATTINY44-20MU, and verify brown-out detection settings to avoid instability during voltage transients.
What are the risks of using the internal oscillator of the ATTINY44-20MU in a precision timing application like UART communication at 9600 baud?
Using the internal oscillator of the ATTINY44-20MU for UART via USI introduces timing inaccuracy risks, as the factory-calibrated internal RC oscillator has a ±10% tolerance over temperature and voltage. This can cause bit errors at 9600 baud, especially near the edges of the -40°C to 85°C range. To mitigate, perform in-system oscillator calibration using a known reference, or switch to an external crystal if baud rate stability is critical. For non-critical async communication, enabling the OSCCAL register tuning and testing across operating conditions is strongly recommended.
Is the ATTINY44-20MU a drop-in replacement for the ATTINY44A-MU in high-volume consumer electronics, and what qualification steps are needed?
The ATTINY44-20MU is not a direct drop-in for the ATTINY44A-MU despite sharing the same base part number, due to subtle differences in power consumption, startup time, and ADC noise performance. The 'A' version typically offers improved electrical characteristics and lower leakage. Before substitution, conduct side-by-side testing under worst-case conditions (e.g., low Vcc, high temperature) focusing on brown-out recovery, ADC accuracy, and sleep current. Also verify Moisture Sensitivity Level (MSL 3) handling compatibility in your assembly process to prevent popcorning during reflow.
How should I handle the exposed pad on the 20-QFN-EP package of the ATTINY44-20MU during PCB layout to ensure reliable soldering and thermal performance?
The exposed pad on the ATTINY44-20MU’s 20-QFN-EP package must be soldered to a grounded thermal pad on the PCB for mechanical stability, thermal dissipation, and EMI reduction. Use a stencil with 50–70% aperture coverage to avoid solder voids, and include multiple thermal vias (e.g., 4–9 vias of 0.3mm diameter) connecting the pad to an internal ground plane. Ensure the PCB pad is slightly larger than the package pad (typically 4.2x4.2mm) and avoid placing traces under the center pad that could trap moisture or cause solder wicking during reflow.
Can the ATTINY44-20MU reliably operate at 20MHz with a 3.3V supply in an industrial environment with frequent voltage dips below 3.0V?
Operating the ATTINY44-20MU at 20MHz with a 3.3V supply is marginal when voltage dips below 3.0V, as the maximum rated frequency drops significantly below 3.6V per the datasheet’s speed vs. Vcc curve. Sustained operation near 2.7V may cause instruction fetch errors or watchdog resets. To ensure reliability, either reduce the clock speed to 8–10MHz using the internal oscillator prescaler, or implement a brown-out detection (BOD) level set to 2.7V to force a safe reset during undervoltage events. Always validate behavior with a programmable power supply simulating real-world dips.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
ATTINY44-20MU CAD Models
Microchip Technology ATTINY44-20MU PCB symbols & footprints
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