ATMEGA640V-8CU - 8MHz AVR 64KB Flash MCU 100-CBGA | Microchip
MPN: ATMEGA640V-8CU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.9 | $12.90 |
| 10 | $11.61 | $116.10 |
| 100 | $10.32 | $1,032.00 |
| 500 | $9.29 | $4,645.00 |
| 1,000 | $8.36 | $8,360.00 |
ATMEGA640V-8CU Overview
An 8-bit AVR microcontroller is a reduced-instruction-set computing device based on the Harvard architecture, executing most instructions in a single clock cycle. In the embedded-system hierarchy, it sits as the central processing element of a power management and control IC, integrating program memory, data memory, peripherals (timers, USARTs, SPI, TWI, ADC) and a CPU core on a single die, eliminating the need for external memory in most designs.
Key features include the AVR RISC core with 32 general-purpose working registers, 64KB self-programmable Flash with 2KB boot section, four flexible 16-bit timer/counters with output-compare modulator, two 8-bit timers, an 8/16-channel 10-bit ADC, and up to four programmable serial USARTs plus master/slave SPI and byte-oriented 2-wire (TWI/I2C) interfaces. A programmable watchdog timer with a separate on-chip oscillator and on-chip analog comparator complete the peripheral set.
The V-variant operates at the low end of the AVR voltage range, supporting green/lead-free assembly and industrial temperature ranges, making it suitable for battery-driven systems where supply voltage may fall well below the conventional 5V rail. The CBGA ball-grid array improves signal integrity and board density versus QFP alternatives for high-pin-count applications.
Typical applications include industrial automation and control nodes, battery-powered instrumentation, building management systems, and multi-channel serial communication gateways that exploit the four USARTs and large 86-I/O complement.
A key design consideration: verify the speed-versus-voltage curve, as the maximum safe clock frequency decreases at lower supply voltages, and ensure JTAG/debug pins are correctly strapped on the 100-ball footprint.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATMEGA640V-8CU — 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 ATMEGA640V-8CU (same form factor and footprint) — differing in Program Memory Size, Program Memory Type, RoHS Status, ADC Channels, Core Processor.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA640V-8CUR
✅ Drop-In✓ In Stock
$4.02 / Unit
View Datasheet →ATMEGA1280V-8CU
✅ Drop-In✓ In Stock
$6.1 / Unit
View Datasheet →ATMEGA2560V-8CUR
✅ Drop-In✓ In Stock
$6.12 / Unit
View Datasheet →ATMEGA2560V-8CUR
✅ Drop-In✓ In Stock
$6.12 / Unit
View Datasheet →ATMEGA1280-16CUR
✅ Drop-In✓ In Stock
$6.25 / Unit
View Datasheet →ATMEGA640V-8CU Maximum Ratings & Electrical Characteristics
| Core Processor | AVR 8-bit RISC |
| Core Size | 8-bit |
| Speed | 8 MHz |
| Flash Memory | 64 KB (32K x 16) |
| EEPROM | 4 KB |
| SRAM | 8 KB |
| Number of I/O | 86 |
| ADC Resolution | 10-bit |
| ADC Channels | 8/16-channel |
| USART Peripherals | Up to 4 |
| SPI | Master/Slave |
| 2-Wire Interface (TWI/I2C) | Yes |
| Watchdog Timer | Programmable, separate on-chip oscillator |
| Analog Comparator | On-chip |
| Package | 100-CBGA (9x9 mm) |
| Mounting Type | Surface Mount |
| Temperature Grade | Industrial |
| RoHS Status | Green / lead-free per FindIC listing |
ATMEGA640V-8CU 100-cbga (9x9 mm) Pin Configuration Guide
Pin configuration for ATMEGA640V-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 ATMEGA640V-8CU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA640V-8CU is suitable for 6 applications: Industrial Automation and Control Nodes, Multi-Channel Serial Communication Gateways, Battery-Powered Instrumentation, Analog Data Acquisition Front Ends, Building Management and HVAC Controllers, Embedded Test and Measurement Modules.
Industrial Automation and Control Nodes
Industrial controllers benefit from the ATMEGA640V-8CU's 86 general-purpose I/O lines and six timer/counters, which drive relays, solenoids, and PWM outputs directly without port expanders. The 64KB Flash accommodates state-machine-heavy firmware plus a bootloader for field updates, while 8KB SRAM buffers sensor history. The industrial temperature grade and green lead-free finish suit factory-floor qualification. Placing the 10-bit ADC on current and voltage sense channels enables closed-loop motor or process control at low cost, and the watchdog timer with separate oscillator provides the fail-safe reset that industrial safety reviews require.
Recommended
Multi-Channel Serial Communication Gateways
Protocol gateways exploit the ATMEGA640V-8CU's up to four USARTs alongside SPI and the byte-oriented 2-wire interface, allowing simultaneous bridging of Modbus RTU, custom serial links, and I2C sensor buses in one 8-bit device. The 64KB Flash holds multiple protocol stacks with room for a bootloader, and 8KB SRAM provides ring buffers for four concurrent serial streams. The V-grade supply range suits systems powered from industrial 3.3V-class or battery-backed rails. Because the CBGA footprint is shared with the 1280/2560 family, a gateway can scale memory without PCB respin as protocol complexity grows.
Recommended
Battery-Powered Instrumentation
Portable and battery-powered instruments select the ATMEGA640V-8CU for its low-voltage V-grade operation, which keeps the MCU alive as the battery discharges far below the conventional 5V rail, per the FindIC listing noting 1.8V-class operation. The 10-bit ADC digitizes sensor signals directly, the EEPROM stores calibration constants that survive reprogramming, and power-down sleep modes extend battery life in duty-cycled logging applications. The 8MHz clock is adequate for data-logging rates typical of handheld meters, and the programmable watchdog guards against firmware lockup in unattended field deployments.
Recommended
Analog Data Acquisition Front Ends
With its 8/16-channel 10-bit ADC and on-chip analog comparator, the ATMEGA640V-8CU consolidates a complete analog acquisition front end in one chip, reading thermistors, pressure bridges, and potentiometer banks across up to 16 multiplexed inputs. The 10-bit resolution delivers roughly 4.9 mV LSB at a 5V reference, sufficient for industrial telemetry. Timer-triggered ADC conversions produce deterministic sampling intervals for control loops, and results stream to a host via USART or SPI. The CBGA package's ball-array construction improves ground-return integrity for the analog section versus fine-pitch QFP alternatives.
Recommended
Building Management and HVAC Controllers
Building automation controllers use the ATMEGA640V-8CU's large I/O complement (86 lines) to monitor door contacts, occupancy sensors, and damper feedback while driving fan and valve outputs. The four USART options support daisy-chained RS-485 field buses, and the 2-wire interface reads environmental sensors on the local board. The 4KB EEPROM holds network addresses, setpoints, and schedules that must survive power cycles, and the 64KB Flash stores control logic plus an OTA-capable bootloader. The green lead-free finish and industrial temperature range align with commercial control equipment qualification requirements.
Recommended
Embedded Test and Measurement Modules
Bench and rack-mounted test modules leverage the ATMEGA640V-8CU's output-compare modulator and six timer/counters to generate precision PWM stimulus and frequency measurements. The JTAG interface provides in-system debug and boundary-scan support during manufacturing test, a capability valued in instrument service life cycles. 64KB Flash accommodates command parsers, calibration routines, and self-test sequences, while the 100-ball CBGA footprint supports the dense, shielded layouts that low-noise measurement boards demand. The V-grade supply range allows integration into instruments sharing mixed low-voltage digital rails.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA640V-8CU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA640V-8CUR | ATMEGA1280V-8CU | ATMEGA2560V-8CUR | ATMEGA1280-16CUR |
|---|---|---|---|---|---|
| Package | 100-CBGA (9x9 mm) | 100-CBGA (9x9 mm) - same | 100-CBGA (9x9 mm) - same | 100-CBGA (9x9 mm) - same | 100-CBGA (9x9 mm) - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 128 KB | 256 KB | 128 KB |
| Max Clock Speed | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 16 MHz |
| SRAM | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| Voltage Grade | V-grade (low voltage) | V-grade | V-grade | V-grade | Standard grade |
| RoHS / Green | Green (lead-free) | Green (lead-free) | Green (lead-free) | Green (lead-free) | Green (lead-free) |
Key Differentiators
- Lowest-cost entry point of the CBGA megaAVR family (vs ATMEGA2560V-8CUR)
- Full family scalability on one PCB (vs ATMEGA1280V-8CU)
- Low-voltage V-grade operation (vs ATMEGA1280-16CUR)
Design Notes
The V-grade suffix indicates the low-voltage operating class for this ATmega640 variant, but the exact minimum/maximum VCC figures are not stated in the retrieved distributor data - confirm the speed-versus-voltage curve in the ATmega640/1280/2560 family datasheet before finalizing the supply design. Estimated: running the core and 86 I/O lines at reduced voltage significantly lowers dynamic power (P proportional to f x V^2), which is the main benefit of choosing the V-grade over the 16MHz standard-grade parts.
The 100-ball CBGA (9x9 mm) is a ball-grid array: unlike TQFP parts, all connections are hidden under the package, so route power and ground balls to solid planes with multiple vias, and define the land pattern per the datasheet package drawing. CBGA rework requires BGA-capable equipment and X-ray inspection - avoid routing signals that may need post-assembly modification underneath the device. Plan the JTAG and programming access balls for test-point availability before layout release.
Do not confuse package suffixes: the CU suffix is the CBGA footprint, while AU variants (e.g., ATMEGA640V-8AU) are TQFP-100 and are NOT drop-in on a CBGA board. Similarly, the R suffix (e.g., ATMEGA640V-8CUR) denotes only reel packaging and is electrically identical. When qualifying substitutes, verify the ball map against the ATmega640/1280/2560 family datasheet, and confirm the JTAG enable fuse state - a disabled JTAG on a BGA part complicates field debugging.
Compliance Information
FindIC listing states GREEN, IND TEMP for ATMEGA640V-8CU, indicating lead-free/RoHS-conformant green assembly. REACH, halogen-free, and conflict-minerals status not stated in retrieved data.
