ATMEGA6450V-8AUR - 8MHz AVR MCU 64KB Flash TQFP-100 | Microchip
MPN: ATMEGA6450V-8AUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.62 | $9.62 |
| 10 | $8.72 | $87.20 |
| 100 | $7.58 | $758.00 |
| 500 | $6.95 | $3,475.00 |
| 1,000 | $6.41 | $6,410.00 |
ATMEGA6450V-8AUR Overview
A microcontroller (MCU) is a self-contained embedded processor that integrates a CPU core, program memory, data memory, and peripherals on a single die. The ATmega family occupies the mid-range of the 8-bit microcontroller hierarchy, sitting above small devices like the ATmega48/328 and below the 128KB ATmega1280/2560, and it remains a workhorse of industrial embedded design due to its simple RISC core, broad toolchain support (Atmel Studio / MPLAB X, avr-gcc), and long product lifecycle.
Key features include the AVR advanced RISC architecture with 130 powerful instructions, most executing in a single clock cycle; 32 general-purpose 8-bit working registers; In-System Programmable (ISP) Flash permitting firmware update on the assembled board; and an integrated segment LCD controller, a signature peripheral of the ATmega6450 that directly drives glass LCD panels in metering and appliance products. Per the ATmega6450 family datasheet, the device also integrates an 8-channel 10-bit ADC, multiple timer/counters with PWM, USART, SPI, and Two-Wire Interface (TWI/I2C) serial channels, brown-out reset, and an internal calibrated RC oscillator that reduces external component count.
The V-speed-grade device in the -8A variant is characterized for 1.8V to 5.5V operation at up to 8 MHz with industrial temperature range, making it well suited to battery-powered and 3V-system designs where the standard 16 MHz ATmega6450P would exceed the voltage budget. Self-programming Flash with a separate boot lock section enables field firmware updates over serial interfaces.
Typical applications include utility meters and energy-monitoring units with direct LCD drive, low-power battery-operated industrial sensors, consumer appliance HMI boards, and legacy production lines standardized on the ATmega megaAVR ecosystem.
Designers should budget the 4KB SRAM carefully: with LCD frame buffers and communication stacks, static allocation in C projects can approach the ceiling, so use the linker map and stack-usage analysis early in the design cycle.
This page synthesizes distributor pricing, drop-in alternatives, pinout guidance, and practical design notes not found in the manufacturer datasheet, with data verified as of 2026-09-18.
Drop-in alternatives for ATMEGA6450V-8AUR — 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 ATMEGA6450V-8AUR (same form factor and footprint) — differing in RoHS Status, Flash Memory, EEPROM, SRAM, EEPROM Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA6450V-8AU
✅ Drop-In✓ In Stock
$2.31 / Unit
View Datasheet →ATMEGA6450V-8AI
✅ Drop-In✓ In Stock
$2.25 / Unit
View Datasheet →ATMEGA6490V-8AU
✅ Drop-In✓ In Stock
$7.45 / Unit
View Datasheet →ATMEGA640V-8AU
✅ Drop-In✓ In Stock
$3.95 / Unit
View Datasheet →ATMEGA3290V-8AUR
✅ Drop-In✓ In Stock
$2.3 / Unit
View Datasheet →ATMEGA6450V-8AUR Maximum Ratings & Electrical Characteristics
| Core Processor | AVR 8-bit RISC |
| Core Size | 8-Bit |
| Maximum Clock Frequency | 8 MHz |
| Flash Memory | 64KB (32K x 16) |
| EEPROM | 2KB |
| SRAM | 4KB |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Instruction Count | 130 instructions (most single-cycle) |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 100-TQFP (14 x 14 mm) |
| Mounting Type | Surface Mount |
| Programmability | In-System Programmable (ISP) Flash |
| LCD Controller | Integrated segment LCD driver |
| RoHS Status | Compliant (GREEN package) |
| Packaging | Tape & Reel (R suffix) |
| Peripheral Set | 10-bit ADC, timers/PWM, USART, SPI, TWI |
| Product Family | AVR ATmega megaAVR (ATmega6450 series) |
ATMEGA6450V-8AUR 100-tqfp (14 x 14 mm) Pin Configuration Guide
Pin configuration for ATMEGA6450V-8AUR (100-tqfp (14 x 14 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 ATMEGA6450V-8AUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA6450V-8AUR is suitable for 6 applications: Utility and Energy Meters with LCD, Battery-Powered Industrial Sensors, Appliance Human-Machine Interfaces, Legacy megaAVR Production Continuity, Handheld Measurement Instruments, Embedded Training and Prototyping Boards.
Utility and Energy Meters with LCD
The integrated segment LCD controller is the defining reason the ATMEGA6450V-8AUR fits utility metering products: it directly drives common/segment lines of a glass LCD without an external driver IC, reducing BOM cost and board area in single- and three-phase energy meters and water/gas meters. The 64KB Flash accommodates metering firmware, tariff tables, and multi-language strings, while 2KB EEPROM stores calibration constants and consumption logs that must survive power cycles. The V-grade 1.8V to 5.5V supply range suits metering supplies derived from mains with wide tolerance. Firmware typically uses the 10-bit ADC for analog front-end sampling and USART for IR or RS-485 communication to a data concentrator. Performance consideration: LCD duty cycle and segment multiplexing share I/O pins with general-purpose ports, so pin budgeting must be done against the datasheet port-function table, not a generic AVR pinout.
Recommended
Battery-Powered Industrial Sensors
Industrial wireless and wired sensor nodes benefit from the ATMEGA6450V-8AUR's low-voltage V-grade operation down to 1.8V, allowing direct connection to two alkaline cells or a single Li-SOCl2 cell through minimal regulation. The 8 MHz clock ceiling keeps dynamic current low, and the AVR single-cycle RISC execution yields efficient MIPS per milliamp for sensor filtering and protocol handling. The 4KB SRAM supports buffering of measurement bursts and MODBUS or custom RS-485 stacks, while the 10-bit ADC reads bridges, pressure, and temperature channels directly. EEPROM retains calibration and unit identification without external NVM. Design consideration: verify the frequency-versus-voltage derating curve when running near 1.8V, and use the brown-out detector with a conservative threshold so flash writes and SRAM contents survive brown-out events on cold battery cranking.
Recommended
Appliance Human-Machine Interfaces
White-goods and HVAC control boards commonly pair a segment LCD, buttons, and a relay or triac drive stage - exactly the peripheral set of the ATMEGA6450V-8AUR. The LCD controller drives the display directly, the port pins handle keypad scanning and load switching, and the 64KB Flash leaves headroom for firmware updates, multiple languages, and diagnostics logging to the 2KB EEPROM. The industrial -40C to +85C rating covers unheated appliance environments, and 5V operation interfaces cleanly with legacy appliance logic. In-system programmable Flash allows manufacturing-line firmware loading and field upgrades through an ISP header. Performance consideration: timer-generated PWM plus watchdog supervision should drive relay timing and mains-synchronized zero-cross detection; budget I/O carefully because LCD segment lines multiplex with the same ports used for keypad rows.
Recommended
Legacy megaAVR Production Continuity
Many long-lifecycle industrial products - PLC I/O cards, flow computers, and test instruments - were designed on the ATmega6450/640 generation and must keep shipping for a decade or more. The ATMEGA6450V-8AUR, being an active Microchip catalog part in tape-and-reel packing, allows existing binaries to keep running with zero code changes: same AVR core, same 130-instruction set, same register map as the original design's firmware target. Its 100-TQFP footprint matches the industry-standard megaAVR land pattern, so no PCB respin is needed for a straightforward BOM refresh. Toolchain continuity matters equally: avr-gcc and Atmel Studio projects compiled a decade ago still build against current device packs. Procurement consideration: qualify the ATMEGA6450V-8AU tray variant as a second packing source to de-risk reel-level allocation constraints.
Recommended
Handheld Measurement Instruments
Portable multimeters, Environmental loggers, and handheld test tools exploit the ATMEGA6450V-8AUR's combination of an on-chip LCD driver, 10-bit ADC, and 1.8V-capable operation to minimize battery count and component count simultaneously. The 64KB Flash stores measurement routines, averaging filters, and data-logging tables; the 4KB SRAM buffers sampled waveforms before display or export over USART/USB-bridge. The internal calibrated RC oscillator removes the need for a crystal in non-timing-critical designs, cutting cost and startup time for instant-on behavior that handheld users expect. EEPROM preserves user settings and logged data between battery changes. Performance consideration: with LCD, ADC sampling, and serial export active, verify worst-case current against the datasheet current-vs-frequency graph at your operating voltage and clock, and place the MCU in a low-power idle mode between sample intervals to extend battery life.
Recommended
Embedded Training and Prototyping Boards
The megaAVR 100-pin family remains a staple of embedded systems education and rapid prototyping because its RISC core is fully documented, the toolchain is free (avr-gcc, MPLAB X), and programming requires only a low-cost ISP adapter. The ATMEGA6450V-8AUR exposes enough I/O on its 100-pin TQFP to wire full lab exercises - LCD, keypad, ADC experiments, SPI and I2C peripherals - on a single device, and the 64KB/4KB memory class avoids outgrowing the chip mid-course. Its ISP Flash means a lab board can be re-flashed thousands of times without wear-out concerns at typical course volumes. The V-grade supply range lets trainers run safely from USB 5V or from bench supplies down to 1.8V to demonstrate voltage-frequency derating behavior. Prototyping note: choose the tray-packed ATMEGA6450V-8AU for hand-socketed lab boards since reels are intended for automated assembly.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA6450V-8AUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA6450V-8AU | ATMEGA6450V-8AI | ATMEGA6490V-8AU | ATMEGA640V-8AU | ATMEGA3290V-8AUR |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 100-TQFP (14x14 mm) | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same |
| Flash Memory | 64KB (32K x 16) | 64KB | 64KB | 64KB | 64KB | 32KB |
| SRAM | 4KB | 4KB | 4KB | 4KB | 4KB | 2KB |
| EEPROM | 2KB | 2KB | 2KB | 2KB | 4KB | 1KB |
| Max Clock Frequency | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Supply Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| LCD Controller | Yes (segment LCD) | Yes | Yes | Yes | No | Yes |
| Operating Temperature | -40C to +85C (Industrial) | Industrial | Industrial | Industrial | Industrial | Industrial |
Key Differentiators
- Integrated segment LCD controller (vs ATMEGA640V-8AU)
- Doubled memory class in the same footprint (vs ATMEGA3290V-8AUR)
- Low-voltage V-grade operation down to 1.8V (vs ATMEGA640-16AUR)
Design Notes
Estimated: operating current scales roughly linearly with clock frequency in AVR devices, so an 8 MHz/5V configuration draws roughly twice the current of the same code at 4 MHz. When running the V-grade part near the 1.8V low end of the 1.8V-5.5V supply range, derate the clock per the datasheet frequency-versus-voltage curve - do not assume the 8 MHz rating holds at minimum voltage. Enable the brown-out detector with a threshold appropriate to the minimum operating voltage so Flash writes and EEPROM updates abort safely during supply dips; this is especially important in metering products where mains sag events are routine.
Place 100 nF ceramic decoupling capacitors at the VCC/GND pin pairs of the 100-TQFP - with 100 pins there are multiple supply pins, and each needs local high-frequency bypass. Add 10 uF bulk capacitance near the device. The LCD bias/contrast network should be routed away from the ADC input traces on port F; LCD drive pins switch continuously and can couple ripple into analog measurements. Provide the standard 6-pin ISP header (VCC, GND, MOSI, MISO, SCK, RESET) with series resistors on shared lines so production programming does not conflict with attached peripherals. Keep RESET pulled up with 10 kohm and leave the pad accessible for debug.
The most frequent integration error on the ATmega6450 is pin-budget collapse: LCD segment and common lines multiplex with general-purpose I/O ports, so a firmware change that adds display segments can silently consume pins already assigned to keypads or relays. Resolve the port assignment against the datasheet Port Functions table before schematic freeze, not after. Second pitfall: SRAM exhaustion - 4KB must hold the LCD frame buffer, serial buffers, and call stack; enable linker stack-usage analysis and set the watchdog early in development. Third: EEPROM wear - metering logs written every few seconds can exceed the EEPROM endurance rating within months; cache writes in SRAM and batch them.
Compliance Information
FindIC listing describes the package as GREEN (RoHS-compliant, halogen-free, lead-free surface finish). Not an automotive AEC-Q100 part. REACH and conflict-minerals status not stated in the provided data.
