ATMEGA1280V-8CU - AVR 8-Bit MCU 128KB 8MHz CBGA-100 | Microchip
MPN: ATMEGA1280V-8CU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.8 | $9.80 |
| 10 | $8.82 | $88.20 |
| 100 | $7.84 | $784.00 |
| 500 | $6.86 | $3,430.00 |
| 1,000 | $6.1 | $6,100.00 |
ATMEGA1280V-8CU Overview
An 8-bit AVR microcontroller is a Harvard-architecture processor that executes most instructions in a single clock cycle. Within the power-management hierarchy of embedded systems, the MCU sits at the heart of the control chain: it reads sensors through its ADC, executes firmware from Flash, and drives actuators through general-purpose I/O. The ATmega family (ATmega640/1280/2560) is the enlarged pin-compatible branch of the popular ATmega line.
Key features include 86 general-purpose I/O lines, four USARTs, a master/slave SPI interface, a byte-oriented 2-wire serial interface (TWI/I2C), an 8/16-channel 10-bit ADC, six flexible timers with output-compare modulator, a programmable watchdog timer with separate on-chip oscillator, an on-chip analog comparator, and interrupt and wake-up on pin change. The advanced RISC core executes 133/135 powerful instructions, most in a single clock cycle.
Technically, the device pairs its AVR core with 32 general-purpose working registers, a real-time counter, JTAG boundary-scan and on-chip debug support, and in-system self-programmable Flash that allows field firmware updates. The CBGA ball-grid array improves board-level routing density versus QFP alternatives while offering shorter interconnects for signal integrity at 8 MHz operation.
Typical applications include industrial automation controllers, battery-powered instrumentation, building control and HVAC panels, and multi-channel sensor hubs that exploit the wide peripheral set and low supply range.
A key design consideration: the 8 MHz speed limit is bonded to the supply voltage; firmware ported from faster 16 MHz ATmega parts must be re-timed, and the CBGA package requires BGA-capable PCB assembly, so consider the TQFP siblings if in-house assembly lacks BGA reflow capability.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATMEGA1280V-8CU β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATMEGA1280V-8CU (same form factor and footprint) β differing in USART, Flash Memory, Package, EEPROM, Mounting Type.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA2560V-8CU
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA1280-16CU
β Drop-Inβ In Stock
$12.9 / Unit
View Datasheet βATMEGA640-16CU
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA640V-8CU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA1280V-8CUR
β Drop-Inβ In Stock
$10.5 / Unit
View Datasheet βATMEGA1280V-8CU Maximum Ratings & Electrical Characteristics
| Core Processor | AVR |
| Core Size | 8-Bit |
| Instruction Set | RISC (133/135 instructions, most single-cycle) |
| Max Clock Speed | 8 MHz |
| Flash Memory | 128KB (64K x 16) In-System Programmable |
| SRAM | 8KB |
| EEPROM | 4KB |
| Supply Voltage Range | 2.7 V to 5.5 V |
| General Purpose I/O | 86 lines |
| USART | 4 channels |
| Serial Interfaces | SPI, 2-wire (TWI/I2C) |
| ADC Resolution | 10-bit |
| ADC Channels | 8/16-channel (ATmega1280: 16-channel) |
| Timers | Six flexible timers with output compare modulator |
| Watchdog Timer | Programmable, separate on-chip oscillator |
| Debug/Scan | JTAG boundary scan and on-chip debug |
| Working Registers | 32 general purpose |
| Package | 100-CBGA (9x9 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | GREEN (per distributor listing) |
ATMEGA1280V-8CU 100-cbga (9x9 mm) Pin Configuration Guide
Pin configuration for ATMEGA1280V-8CU (100-cbga (9x9 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATMEGA1280V-8CU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA1280V-8CU is suitable for 6 applications: Industrial Automation Controllers, Battery-Powered Portable Instruments, Multi-Channel Sensor Hubs, Building Control and HVAC Panels, Embedded Networking and Communication Nodes, Robotics and Motion Control Boards.
Industrial Automation Controllers
In factory automation nodes, the ATMEGA1280V-8CU acts as the local control brain driving actuators and sequenced outputs. Its 86 GPIO lines allow direct control of relays, valves, and indicator banks without port expanders, while four USARTs link PLC backplanes, Modbus RTU buses, and operator panels simultaneously. The 10-bit ADC reads analog transducers such as pressure and temperature sensors with adequate resolution for process monitoring, and six timers generate precise PWM for motor and heater control. The programmable watchdog with its own on-chip oscillator restarts firmware after a fault, satisfying industrial reliability expectations. Its JTAG port supports boundary-scan test on dense boards, and the 2.7V-5.5V supply tolerates industrial rail droop.
Recommended
Battery-Powered Portable Instruments
For handheld meters, data loggers, and field instruments, the V-grade 2.7V-5.5V supply range is the decisive parameter: the ATMEGA1280V-8CU runs directly from Li-ion cells (4.2V down to 3.0V) or four AA cells through their full discharge curve with no regulator dropout margin lost. The AVR sleep modes and wake-up-on-pin-change let the firmware duty-cycle the 8 MHz core so average current stays in the microamp region between measurements. Four USARTs and TWI collect data from external sensor front ends, the 10-bit ADC digitizes analog channels locally, and 4KB EEPROM stores calibration constants that survive battery replacement. The 8 MHz cap ensures full timing spec compliance at low supply voltage, unlike 16 MHz grades.
Recommended
Multi-Channel Sensor Hubs
The ATMEGA1280V-8CU aggregates many sensors in distributed monitoring systems. The 16-channel 10-bit ADC digitizes up to sixteen analog transducers, TWI (I2C) and SPI buses attach digital sensors such as pressure, humidity, and MEMS devices, and pin-change interrupts wake the core on asynchronous events. Four USARTs push aggregated data upstream to gateways or radios in parallel, so no channel blocks another. 128KB of Flash hosts protocol stacks plus local buffering logic, and 8KB SRAM holds sample windows. Operating from 2.7V lets the hub share the sensor rail directly, simplifying power tree design; the CBGA package shortens interconnects for cleaner ADC ground references on dense boards.
Recommended
Building Control and HVAC Panels
In HVAC controllers, damper actuator boards, and lighting-zone panels, the ATMEGA1280V-8CU combines enough GPIO for zone-by-zone outputs with the peripheral mix these panels demand. Six timers with output-compare modulator generate phase-correct PWM for fan speed and valve positioning; the 10-bit ADC samples thermistors across multiple zones via the 16-channel mux; and TWI links the panel to room units. The watchdog with separate oscillator guarantees recovery from brown-out-induced lockups, a common field failure mode. The 2.7V-5.5V supply range rides through 24V-transformer-derived rail sag, and 128KB Flash accommodates scheduling logic, communication stacks, and firmware updatable in-system through JTAG or ISP.
Recommended
Embedded Networking and Communication Nodes
With four independent USARTs plus SPI and TWI, the ATMEGA1280V-8CU is a natural protocol concentrator: it bridges RS-485 field buses, RF module links, and local device buses in one package. The AVR core handles framing, CRC checks, and buffering for concurrent channels, while 8KB SRAM holds multiple RX/TX ring buffers. Its 8 MHz clock keeps serial bit rates to standard baud rates with low EMI, easing compliance in residential environments. In-system programmable Flash allows remote firmware updates over the data link, and the analog comparator provides zero-crossing detection for power-line signaling schemes. The 2.7V-5.5V range lets the node share the radio module's supply rail directly.
Recommended
Robotics and Motion Control Boards
Hobby and light-industrial robot controllers use the ATMEGA1280V-8CU to coordinate multiple servo and motor channels. Six timers yield enough PWM channels for servo banks and brushed-motor H-bridges, the 10-bit ADC reads current shunts and potentiometer feedback for closed-loop torque limiting, and the output-compare modulator offloads waveform generation from software for jitter-free motion. Four USARTs connect to PC telemetry, IMU modules, and motor-driver controllers such as the TLE94110. 128KB Flash stores kinematics and path planning code; the CBGA package conserves board area on compact controller stacks. Watchdog supervision plus brown-out protection keeps the robot recoverable after supply glitches during motor stall events.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA1280V-8CU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA2560V-8CU | ATMEGA1280-16CU | ATMEGA640-16CU | ATMEGA640V-8CU |
|---|---|---|---|---|---|
| Package | 100-CBGA (9x9) | 100-CBGA (9x9) - same | 100-CBGA (9x9) - same | 100-CBGA (9x9) - same | 100-CBGA (9x9) - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) |
| Flash Memory | 128KB | 256KB | 128KB | 64KB | 64KB |
| Max Clock Speed | 8 MHz | 8 MHz | 16 MHz | 16 MHz | 8 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V (16 MHz grade) | 4.5 V to 5.5 V (16 MHz grade) | 2.7 V to 5.5 V |
| Cross-Brand Drop-In Available | No (AVR family is Microchip-exclusive) | No (same brand family only) | No (same brand family only) | No (same brand family only) | No (same brand family only) |
Key Differentiators
- Double the program Flash in the same footprint (vs ATMEGA640V-8CU)
- Low-voltage 8 MHz operation for battery designs (vs ATMEGA1280-16CU)
- Memory/cost trade-off within one footprint (vs ATMEGA2560V-8CU)
Design Notes
The 100-CBGA (9x9) package requires BGA-capable PCB fabrication (fine-pitch land pattern, typically 0.8 mm ball pitch) and reflow assembly with X-ray or acoustic inspection, as solder joints under the array cannot be visually inspected. Provide vias-in-pad or dog-bone fanout on all 100 balls, and reserve at least the JTAG port test points because boundary scan is your primary electrical test method for the array. If your assembly line lacks BGA reflow, redesign on the TQFP-100 sibling (ATMEGA1280V-8AU) instead of forcing this package.
Decouple every supply ball with a 100 nF ceramic capacitor placed within 2 mm of the corresponding ball, plus one bulk 10 uF capacitor per supply domain. Estimated: at 8 MHz with typical I/O loading, core current is in the low tens of milliamp range; sizing the 3.3V or 5V rail LDO for 100 mA plus I/O load provides comfortable margin. For battery designs, exploit sleep modes and wake-up on pin change to cut average current; remember the watchdog's separate oscillator keeps running in some sleep modes and draws its own budget.
Do not port firmware from 16 MHz ATmega1280/2560 parts without re-timing: baud-rate generator divisors, delay loops, and PWM frequencies all scale with the 8 MHz clock, and the V-grade is not specified to run faster. Verify that analog peripherals (ADC reference, analog comparator) are powered from a clean rail - switching regulators upstream can degrade 10-bit ADC accuracy; add an RC filter or ferrite bead on AVCC. Finally, confirm the exact temperature grade and voltage ratings in the Microchip combined ATmega640/1280/2560 datasheet before finalizing the power tree.
Compliance Information
Distributor listings describe the part as GREEN package. Full REACH/halogen details should be confirmed via the Microchip product page environmental data.
