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ATTINY261A-XUR
Microchip Technology
IC MCU 8BIT 2KB FLASH 20TSSOP
1454 Pcs New Original In Stock
AVR AVR® ATtiny Microcontroller IC 8-Bit 20MHz 2KB (1K x 16) FLASH 20-TSSOP
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5.0 / 5.0
- (485 Ratings)
ATTINY261A-XUR
Product Overview
1452484
DiGi Electronics Part Number
ATTINY261A-XUR-DGManufacturer
Microchip Technology
ATTINY261A-XUR
Description
IC MCU 8BIT 2KB FLASH 20TSSOPInventory
1454 Pcs New Original In Stock
AVR AVR® ATtiny Microcontroller IC 8-Bit 20MHz 2KB (1K x 16) FLASH 20-TSSOP
Quantity
Minimum 1
Minimum 1
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ATTINY261A-XUR Technical Specifications
Category
Embedded, Microcontrollers
Packaging
Tape & Reel (TR)
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
16
Program Memory Size
2KB (1K x 16)
Program Memory Type
FLASH
EEPROM Size
128 x 8
RAM Size
128 x 8
Voltage - Supply (Vcc/Vdd)
1.8V ~ 5.5V
Data Converters
A/D 11x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C (TA)
Mounting Type
Surface Mount
Supplier Device Package
20-TSSOP
Package / Case
20-TSSOP (0.173", 4.40mm Width)
Base Product Number
ATTINY261
Datasheet & Documents
HTML Datasheet
ATTINY261A-XUR-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
ATTINY261A-XURTR
1611-ATTINY261A-XURDKR-DG
ATTINY261A-XURDKR
1611-ATTINY261A-XURDKR
1611-ATTINY261A-XURDKRINACTIVE
ATTINY261AXUR
1611-ATTINY261A-XURCT
1611-ATTINY261A-XURTR
ATTINY261A-XUR-DG
ATTINY261A-XURCT
1611-ATTINY261A-XURTR-DG
1611-ATTINY261A-XURTRINACTIVE
Standard Package
4,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
Je suis impressionné par la cohérence de qualité dans tous leurs produits. Cela rend mon travail beaucoup plus facile.
de desembre 02, 2025
I value their transparency in pricing, which makes comparison shopping easier.
de desembre 02, 2025
The staff are always welcoming and willing to assist.
de desembre 02, 2025
Their logistics team is highly efficient, ensuring stable delivery schedules.
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Frequently Asked Questions (FAQ)
Can the ATTINY261A-XUR safely replace an ATtiny261 in a 3.3V industrial sensor design without firmware changes, given its wider Vcc range and internal oscillator accuracy?
Yes, the ATTINY261A-XUR can directly replace the original ATtiny261 in 3.3V applications, but you must verify internal oscillator calibration at your operating voltage. While both support 1.8V–5.5V, the 'A' revision includes improved factory calibration of the internal RC oscillator (±10% typical vs. ±15% on older versions), reducing timing drift in USI-based communication. However, if your firmware relies on precise timing (e.g., bit-banged SPI), perform in-system validation across temperature (-40°C to 85°C) and supply variation to ensure protocol compliance. No firmware rewrite is typically needed, but recalibrating OSCCAL may be required for high-reliability designs.
What are the key risks when using the ATTINY261A-XUR in a battery-powered IoT node with deep sleep modes, and how does its 128-byte RAM limit impact firmware architecture?
The primary risk lies in stack overflow and variable fragmentation due to only 128 bytes of RAM—this severely constrains RTOS usage, deep call stacks, or large buffer allocations. In battery-powered designs, improper sleep mode transitions (e.g., failing to disable unused peripherals like the ADC or WDT) can cause µA-level leakage, drastically reducing battery life. Use the Power-down mode with only the watchdog or external interrupt enabled, and ensure all I/O pins are configured to minimize leakage. Additionally, the 2KB flash limits code size; avoid floating-point math or complex libraries. Optimize with compiler flags (-Os) and static allocation to prevent heap fragmentation.
How does the ATTINY261A-XUR compare to the newer ATtiny212 for a cost-sensitive motor control application requiring PWM and analog feedback, and should I consider migrating?
The ATTINY261A-XUR remains viable for simple motor control with its 3-channel 8-bit PWM and 10-bit ADC, but the ATtiny212 offers significant advantages: event system for peripheral triggering without CPU, improved 12-bit ADC, and better CIPs (Core Independent Peripherals) that reduce interrupt load. However, migration requires PCB re-layout (different pinout: 8-pin DFN vs. 20-TSSOP) and firmware porting due to different register maps. For high-volume, cost-sensitive designs where board space allows, the ATTINY261A-XUR is still reliable and lower-cost. But if you need higher efficiency, lower BOM (fewer external components), or plan future scalability, the ATtiny212 is a better long-term choice despite higher NRE effort.
Is the ATTINY261A-XUR suitable for automotive under-hood applications given its -40°C to 85°C rating, and what derating or protection measures are necessary?
No, the ATTINY261A-XUR is not rated for automotive use—its operating temperature range (-40°C to 85°C) falls short of AEC-Q100 Grade 2 (-40°C to 105°C) or Grade 1 (125°C) requirements. Even with derating, sustained exposure to engine bay temperatures (>105°C) risks flash data corruption, oscillator drift, and reduced lifespan. If used in non-critical cabin electronics (e.g., interior lighting), ensure thermal management via PCB copper pours and avoid proximity to heat sources. For true under-hood deployment, consider automotive-qualified alternatives like the ATtiny817-A (AEC-Q100 certified). Always add reverse-polarity and transient protection (TVS diodes) regardless of application due to the lack of built-in ESD hardening beyond standard HBM levels.
What design precautions are needed when replacing a legacy PIC12F683 with the ATTINY261A-XUR in a 5V-tolerant industrial switch interface, especially regarding I/O voltage compatibility and brown-out behavior?
When replacing the PIC12F683 with the ATTINY261A-XUR in a 5V system, ensure all input signals do not exceed Vcc + 0.5V—the ATTINY261A-XUR lacks true 5V-tolerant inputs when running at 3.3V. If interfacing with 5V logic, use level shifters or clamp diodes. Configure the Brown-out Detection (BOD) to 4.3V or 2.7V (depending on Vcc) to prevent erratic behavior during voltage sags common in industrial environments; disable BOD only if power supply is exceptionally stable. Unlike the PIC12F683, the ATTINY261A-XUR’s USI peripheral simplifies I²C/SPI implementation but requires careful clock stretching handling. Also, verify startup time: the AVR’s internal oscillator starts faster than the PIC’s, which may affect reset circuit design—consider adding a small delay in firmware before enabling interrupts.
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ATTINY261A-XUR CAD Models
Microchip Technology ATTINY261A-XUR PCB symbols & footprints
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