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ATTINY44A-MMH
Microchip Technology
IC MCU 8BIT 4KB FLASH 20VQFN
2285 Pcs New Original In Stock
AVR AVR® ATtiny Microcontroller IC 8-Bit 20MHz 4KB (2K x 16) FLASH 20-VQFN (3x3)
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5.0 / 5.0
- (458 Ratings)
ATTINY44A-MMH
Product Overview
1251800
DiGi Electronics Part Number
ATTINY44A-MMH-DGManufacturer
Microchip Technology
ATTINY44A-MMH
Description
IC MCU 8BIT 4KB FLASH 20VQFNInventory
2285 Pcs New Original In Stock
AVR AVR® ATtiny Microcontroller IC 8-Bit 20MHz 4KB (2K x 16) FLASH 20-VQFN (3x3)
Quantity
Minimum 1
Minimum 1
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ATTINY44A-MMH Technical Specifications
Category
Embedded, Microcontrollers
Packaging
Tray
Series
AVR® ATtiny
Product Status
Active
DiGi-Electronics Programmable
Not Verified
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, 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)
1.8V ~ 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-VQFN (3x3)
Package / Case
20-VFQFN Exposed Pad
Base Product Number
ATTINY44
Datasheet & Documents
HTML Datasheet
ATTINY44A-MMH-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
Other Names
ATTINY44AMMH
Standard Package
490
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
항상 빠르게 상품을 받을 수 있었고, 문제가 생기면 즉시 해결해주는 모습이 좋아요.
Dec 02, 2025
Die erschwinglichen Preise bei DiGi Electronics machen es einfach, qualitativ hochwertige Produkte zu kaufen.
Dec 02, 2025
Their well-stocked inventory ensures we can swiftly respond to urgent needs.
Dec 02, 2025
I've used this product in challenging environments, and it continues to perform reliably.
Dec 02, 2025
I always find their prices to be significantly lower than competitors, great savings every time.
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Frequently Asked Questions (FAQ)
Can I replace an ATTINY44A-MMH with a newer ATTINY441 in a space-constrained wearable design without redesigning the PCB?
While the ATTINY44A-MMH and ATTINY441 share the same 20-VQFN (3x3) package and pinout, direct replacement is not recommended without firmware validation. The ATTINY441 introduces architectural changes, including enhanced peripherals like a second USART and improved clocking options, which may cause unexpected behavior in legacy code optimized for the ATTINY44A-MMH’s single USI interface. Additionally, the ATTINY441 has different interrupt vector mapping and power-up timing. If board space is critical, conduct a full functional test under worst-case voltage (1.8V) and temperature (-40°C) conditions before committing to the swap—otherwise, stick with the proven ATTINY44A-MMH for design stability.
What are the real-world risks of running the ATTINY44A-MMH at 20MHz from its internal oscillator in a noisy industrial environment?
Operating the ATTINY44A-MMH at its maximum 20MHz speed using the internal RC oscillator in electrically noisy environments increases susceptibility to timing jitter and brown-out events. While the part includes a Brown-out Detect (BOD) and Power-on Reset (POR), rapid voltage fluctuations from nearby motors or relays can trigger unintended resets if Vcc dips below 2.7V during active computation. To mitigate risk, either reduce the clock speed to 8MHz (which improves noise margin) or add a low-ESR ceramic capacitor (<100nF) as close as possible to the VDD pin. For mission-critical applications, consider using an external crystal with load capacitors, despite the added BOM cost and board area.
How does the ATTINY44A-MMH compare to the STM8S003F3P6 for ultra-low-cost sensor node designs requiring 4KB flash and 12 I/Os?
The ATTINY44A-MMH offers superior analog integration (8-channel 10-bit ADC, built-in temperature sensor) and wider operating voltage (1.8V–5.5V) compared to the STM8S003F3P6, which lacks an internal temp sensor and requires ≥2.97V for full operation. However, the STM8S003F3P6 provides better debug support via SWIM and slightly higher flash endurance (10k vs 1k write cycles on ATTINY44A-MMH EEPROM). For battery-powered sensor nodes where analog sensing and low-voltage operation are critical, the ATTINY44A-MMH is preferable—but if field firmware updates are frequent, the STM8’s robustness may justify its narrower voltage range.
Is it safe to disable the watchdog timer (WDT) on the ATTINY44A-MMH in a safety-critical home automation controller?
Disabling the WDT on the ATTINY44A-MMH in safety-critical applications significantly increases the risk of latent firmware hangs going undetected, especially under EMI stress or during brown-out conditions. While the ATTINY44A-MMH includes POR and BOD, these do not catch software lockups. Best practice is to configure the WDT with a 1-second timeout and implement a periodic refresh in the main loop. If timing constraints prevent regular servicing, use a windowed WDT mode (if supported by your toolchain) or add an external supervisory circuit like the TPS3823. Never rely solely on the internal reset mechanisms for fault recovery in systems controlling physical actuators.
Can I use the ATTINY44A-MMH’s internal temperature sensor for accurate environmental monitoring in a sealed enclosure?
The internal temperature sensor in the ATTINY44A-MMH is intended for die-temperature estimation, not ambient environmental monitoring. It exhibits significant offset (±10°C typical) and lacks calibration data in the datasheet. In a sealed enclosure, self-heating from the MCU itself—especially during ADC conversions or PWM activity—further skews readings. For reliable ambient sensing, use an external calibrated sensor like the TMP117 (I²C, ±0.1°C accuracy) and place it away from the ATTINY44A-MMH. If cost constraints force internal use, implement a duty-cycled measurement scheme: power down peripherals, take multiple ADC samples after a 100ms stabilization delay, and apply a factory-characterized offset correction—but expect limited accuracy (±5°C at best).
Quality Assurance (QC)
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ATTINY44A-MMH CAD Models
Microchip Technology ATTINY44A-MMH PCB symbols & footprints
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