ATMEGA6450V-8AU - 8-bit AVR MCU, 64KB Flash, 8MHz | Microchip
MPN: ATMEGA6450V-8AU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.28 | $3.28 |
| 10 | $3.05 | $30.50 |
| 100 | $2.79 | $279.00 |
| 500 | $2.55 | $1,275.00 |
| 1,000 | $2.31 | $2,310.00 |
ATMEGA6450V-8AU Overview
An 8-bit AVR microcontroller is a RISC-based single-chip processor in the voltage regulator-to-processor hierarchy of embedded power and control electronics. The AVR architecture executes most of its 130 powerful instructions in a single clock cycle, giving throughput of up to 8 MIPS at 8 MHz while consuming very little power. The ATMEGA6450V sits in the ATmega large-pin-count family alongside the ATmega640, ATmega1280, and ATmega2560, and uniquely integrates a segment LCD drive capability that the standard ATmega640 family lacks.
Key differentiating specifications include 64KB (32K x 16) self-programmable Flash memory, a 10-bit ADC, 53 general-purpose I/O lines, and an extended low-voltage operating range - the V-variant is specified for operation down to 1.8V, which supports battery-powered and energy-harvesting designs that the standard 4.5V-5.5V parts cannot serve.
Technically, the device uses the AVR advanced RISC architecture with 8 general-purpose working registers, on-chip in-system programmable (ISP) Flash, JTAG/ debugWIRE-style programming access via the ICSP interface, and peripheral set including USARTs, timers, SPI, and the LCD controller. The two-cycle-execution-worst-case RISC core keeps interrupt latency predictable, important for real-time control loops.
Typical applications include utility metering with LCD displays, industrial control panels, battery-operated instrumentation, and building automation nodes where a 1.8V-capable MCU with integrated LCD drive reduces BOM count.
Design consideration: at 8 MHz the ATmega6450V can run from a wide supply window, but peripheral performance (ADC clock, LCD frame rate) must be scaled accordingly in firmware; do not reuse 16 MHz initialization code from 5V ATmega640 designs.
This page synthesizes verified distributor pricing, drop-in alternatives within the same 100-TQFP footprint, and practical design notes not consolidated in the manufacturer datasheet. Pricing references are as of 2026-09-18.
Drop-in alternatives for ATMEGA6450V-8AU 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 ATMEGA6450V-8AU (same form factor and footprint) β differing in Package, Operating Temperature, EEPROM, SRAM, Supply Voltage Range.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA6450V-8AI
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA6490V-8AU
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA640V-8AU
β Drop-Inβ In Stock
$3.95 / Unit
View Datasheet βATMEGA640-16AUR
β Drop-Inβ In Stock
$5.9 / Unit
View Datasheet βATMEGA3290V-8AU
β Drop-Inβ In Stock
$3.91 / Unit
View Datasheet βATMEGA6450A-8AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA6450V-8AU Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR 8-bit RISC |
| Data Bus Width | 8 Bit |
| Maximum Clock Speed | 8 MHz |
| Flash Memory | 64KB (32K x 16), In-System Programmable |
| EEPROM | 2KB |
| SRAM | 4KB |
| ADC Resolution | 10-bit |
| I/O Ports | 53 I/O lines |
| Supply Voltage | 1.8 V (V-variant extended low-voltage range) |
| Instructions | 130 powerful instructions, most single-cycle |
| In-System Programming | Yes (ICSP) |
| Package | 100-TQFP (14 x 14 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (A-grade industrial) |
| Life Cycle Stage | ACTIVE |
| LCD Controller | Integrated segment LCD drive (6450 family) |
| RoHS Status | Compliant (GREEN package per Microchip classification) |
ATMEGA6450V-8AU 100-tqfp (14 x 14 mm) Pin Configuration Guide
Pin configuration for ATMEGA6450V-8AU (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-8AU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA6450V-8AU is suitable for 6 applications: Utility Metering with LCD Display, Battery-Powered Portable Instrumentation, Industrial Control Panels and HMI Nodes, Building Automation Sensor Nodes, Test and Measurement Fixture Controllers, Consumer Appliance User-Interface Boards.
Utility Metering with LCD Display
The ATMEGA6450V-8AU fits utility metering because it integrates a segment LCD controller, a 10-bit ADC, and 64KB of self-programmable Flash in one 100-TQFP device, eliminating a separate LCD driver IC from the meter BOM. The 1.8V-capable V-grade supports designs running directly from low-voltage battery rails, while the 2KB EEPROM stores accumulated consumption values across power interruptions. The meter firmware typically runs the ADC in a polling loop and multiplexes the LCD at a low frame rate, keeping average current low; at 8 MHz the core delivers ample headroom for communication protocols such as M-Bus or IR-based meter reading. Performance consideration: scale the ADC prescaler so sampling noise stays within the 10-bit ENOB budget at the reduced 8 MHz system clock.
Recommended
Battery-Powered Portable Instrumentation
For portable instruments, the ATMEGA6450V-8AU's extended low-voltage operation (down to 1.8V for the V-grade) lets the MCU run directly from two alkaline cells or a single Li-cell with a simple regulator, avoiding boost converters. The AVR core's single-cycle instruction execution provides up to 8 MIPS at 8 MHz, sufficient for real-time measurement math, and the 4KB SRAM accommodates buffering of sensor data samples. The integrated LCD controller renders readings without a display coprocessor, cutting both cost and sleep-mode complexity. In practice, firmware places the MCU in power-down between measurement bursts and wakes via external interrupt; the EEPROM retains calibration constants. Designers should budget the LCD drive current, which dominates the sleep budget on the 6450 family compared to non-LCD siblings like the ATMEGA640V-8AU.
Recommended
Industrial Control Panels and HMI Nodes
On industrial control panels, the ATMEGA6450V-8AU serves as a local HMI controller driving a segment LCD and scanning keys while exchanging data over USART or SPI with a main PLC or gateway. The 53 general-purpose I/O lines of the 100-TQFP package handle relay drive, indicator LEDs, and key matrices without port expanders. The A-grade operating temperature range of -40C to +85C supports cabinet environments, and the in-system programmable Flash allows firmware updates in the field via ICSP or a bootloader stored in the 64KB array. Because panel systems often run at 5V, designers should confirm supply headroom for the V-grade in the datasheet or consider the standard-grade ATMEGA6450A-8AU variant. The 10-bit ADC supports monitoring of supply voltage and thermistor-based cabinet temperature.
Recommended
Building Automation Sensor Nodes
In building automation, the ATMEGA6450V-8AU acts as a wall-mounted node combining a small segment LCD, temperature/humidity sensing via the 10-bit ADC, and RS-485 or RF module communication through its USARTs. The V-grade's low-voltage operation pairs well with bus-powered or battery-backup nodes, and the 64KB Flash leaves generous room for protocol stacks alongside the application. The 2KB EEPROM stores node addresses and setpoints through power cycles. Firmware typically schedules ADC reads and LCD refreshes in a timer-driven state machine, with the MCU idling between events to conserve energy. A key benefit over discrete solutions is integration: display, measurement, and communication control in one package reduces PCB area on the narrow node form factor. Validate the exact supply window at 8 MHz against the datasheet speed-voltage curve before finalizing the power design.
Recommended
Test and Measurement Fixture Controllers
The ATMEGA6450V-8AU is a practical controller for bench test fixtures, where it sequences relays, reads pass/fail analog thresholds via the 10-bit ADC, and shows status on a segment LCD driven by the integrated controller. The 130-instruction AVR RISC core executes deterministic single-cycle code, so timing-critical relay sequencing is predictable without an RTOS. The 4KB SRAM holds test-result logs buffered to EEPROM for later retrieval over USART to a PC. The ICSP interface lets production teams update fixture firmware without desoldering the device. Since fixtures commonly run at 5V, engineers may alternatively specify the ATMEGA6450A-8AU standard grade; both share the same 100-TQFP footprint, allowing one PCB to host either supply grade. Keep ADC reference stability in mind: use a precision reference rather than VCC when thresholds must repeat across units.
Recommended
Consumer Appliance User-Interface Boards
Consumer appliances such as ovens, washing machines, and HVAC thermostats use the ATMEGA6450V-8AU as the user-interface brain: the integrated LCD controller drives the segment display, the 53 I/O lines scan the key matrix and drive relays or triac logic, and the 10-bit ADC reads NTC temperature sensors. The 64KB Flash accommodates multi-language UI code and upgradeable control logic, while the RoHS-compliant GREEN package meets consumer environmental requirements. The V-grade's wide supply tolerance provides robustness against mains-derived supply sags after regulation. Firmware typically runs a superloop with timer-based LCD multiplexing, and the EEPROM preserves user settings through outages. Cost-sensitive designs with smaller code needs can drop to the pin-compatible ATMEGA3290V-8AU within the same LCD megaAVR family, preserving the PCB layout while halving Flash.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA6450V-8AU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA6450V-8AI | ATMEGA640V-8AU | ATMEGA3290V-8AU |
|---|---|---|---|---|
| Package | 100-TQFP (14x14 mm) | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) |
| Flash Memory | 64KB (32K x 16) | 64KB | 64KB | 32KB |
| EEPROM | 2KB | 2KB | 2KB | 2KB |
| SRAM | 4KB | 4KB | 4KB | 2KB |
| Maximum Clock Speed | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Integrated LCD Controller | Yes | Yes | No | Yes |
| Low-Voltage (1.8V) V-Grade | Yes | Yes | Yes (V-grade) | Yes (V-grade) |
Key Differentiators
- Integrated segment LCD controller (vs ATMEGA640V-8AU)
- Extended low-voltage operation (V-grade) (vs ATMEGA6450A-8AU)
- Double the program memory at the same footprint (vs ATMEGA3290V-8AU)
Design Notes
The V-variant is chosen specifically for extended low-voltage operation, but supply choice interacts with clock speed: the AVR speed-versus-voltage curve in the manufacturer datasheet limits maximum safe frequency at low VCC. Running 8 MHz near the bottom of the voltage window may violate the safety margin - either lower the clock via fuse/CLKPR settings, add brown-out detection enabled with an appropriate BOD level, or regulate to a midpoint voltage. Estimate: a 2-cell alkaline stack ranges roughly 3.2V fresh to 1.8V depleted; plan firmware derating or cutoff before the brown-out floor.
The 100-TQFP (0.5 mm pitch) requires careful escape routing; use 4-mil trace/space or better under the device, and fan out power pins to a solid ground plane with 100 nF ceramic decoupling at each VCC/GND pair plus one bulk capacitor per supply domain. The 14x14 mm body gives room for via-in-pad thermal relief on the exposed corners but the QFP has no thermal pad, so heat removal is through the leads - keep dissipation modest (the AVR core at 8 MHz is typically well under 100 mW). Place the ICSP header within a few centimeters of the programming pins to keep programming signal integrity clean.
Do not port initialization code from the standard ATmega640/1280 5V family without review: the V-variant's fuse defaults, BOD levels, and LCD driver clocking differ, and one archived summary datasheet (27 pages) does not cover all family electricals - always design against the current full datasheet on the Microchip product page. Also note conflicting third-party data in circulation (some aggregator pages list 16 MHz / 4.5-5.5V values that belong to the non-V part); the DigiKey-verified rating for this MPN is 8 MHz. Finally, remember the 6450 family includes the LCD controller - leaving it unclocked but enabled can waste current in sleep modes.
Compliance Information
GREEN package classification for this MPN per Microchip family data; formal REACH and conflict-minerals declarations should be obtained from the Microchip product page material declaration documents.
