ATMEGA6450P-AUR - 8-Bit AVR MCU 64KB Flash 20MHz | Microchip
MPN: ATMEGA6450P-AUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.89 | $5.89 |
| 10 | $5.42 | $54.20 |
| 100 | $4.95 | $495.00 |
| 500 | $4.55 | $2,275.00 |
| 1,000 | $4.18 | $4,180.00 |
ATMEGA6450P-AUR Overview
An 8-bit AVR microcontroller is a single-chip computer built around the AVR enhanced RISC architecture, in which 32 general purpose working registers are directly connected to the arithmetic logic unit (ALU). Because two independent registers can be accessed in a single instruction executed in one clock cycle, the architecture achieves throughputs of up to 1 MIPS per MHz - roughly ten times faster than conventional CISC microcontrollers - placing the ATmega family in the general-purpose microcontroller tier of the embedded processing hierarchy.
Key features of the ATMEGA6450P-AUR include picoPower technology for low-power battery operation, read-while-write Flash for self-programming, 54 or 69 general purpose I/O lines depending on package, and industrial temperature operation (-40C to +85C). Supply voltage spans 1.8V to 5.5V per distributor parametric data (2.5V/3.3V/5V typical rails), allowing direct battery-powered designs.
The AVR core combines a rich instruction set with single-cycle execution; peripherals typically integrated in this family include USART, SPI, I2C (TWI), timers, ADC and an LCD controller segment in the 64xx family, enabling compact single-chip designs. On-chip In-Circuit Serial Programming (ICSP) via tools such as the MPLAB SNAP allows firmware updates without removing the device from the board.
Typical applications include industrial control panels, consumer appliances, metering and instrumentation, and LCD-equipped human-machine interfaces where a large I/O count and in-system programmable Flash are valuable.
Design consideration: verify the clock source (crystal versus internal RC) early, since the picoPower sleep modes achieve lowest current only with the appropriate fuse settings and brown-out configuration.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet summary, with pricing references as of 2026-09-18.
Drop-in alternatives for ATMEGA6450P-AUR — 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 ATMEGA6450P-AUR (same form factor and footprint) — differing in Flash Memory, EEPROM, SRAM, Number of I/O, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA6450P-AU
✅ Drop-In✓ In Stock
$5.9 / Unit
View Datasheet →ATMEGA6450A-AU
✅ Drop-In✓ In Stock
$5.95 / Unit
View Datasheet →ATMEGA6490P-AUR
✅ Drop-In✓ In Stock
$5.95 / Unit
View Datasheet →ATMEGA3250P-AUR
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA3250PA-AUR
✅ Drop-In✓ In Stock
$2.98 / Unit
View Datasheet →ATMEGA6450V-8AUR
✅ Drop-In✓ In Stock
$6.41 / Unit
View Datasheet →ATMEGA6450P-AUR Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Flash Memory | 64 KB (32K x 16) ISP Flash |
| EEPROM | 2 KB |
| SRAM | 4 KB (4K x 8) |
| Maximum Clock Frequency | 20 MHz |
| Supply Voltage Range | 1.8 V to 5.5 V (2.5V/3.3V/5V typical) |
| General Purpose I/O | 54 / 69 I/O lines |
| Working Registers | 32 general purpose registers |
| Package | 100-TQFP (14x14 mm) |
| Mounting Type | Surface Mount |
| Temperature Grade | Industrial |
| Programming Interface | ICSP (In-Circuit Serial Programming) |
| Low Power Technology | picoPower |
| Read-While-Write Flash | Yes |
| Series | AVR ATmega |
ATMEGA6450P-AUR 100-tqfp (14x14 mm) Pin Configuration Guide
Pin configuration for ATMEGA6450P-AUR (100-tqfp (14x14 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 ATMEGA6450P-AUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA6450P-AUR is suitable for 6 applications: Industrial Control Panels, Metering and Instrumentation, Appliance and White-Goods Control, Human-Machine Interface (HMI) Boards, Battery-Powered Portable Devices, Educational and Prototyping Platforms.
Industrial Control Panels
The ATMEGA6450P-AUR fits industrial control and automation panels because its 69 general purpose I/O lines in a single 100-TQFP allow direct drive of relays, indicators, and keypads without port expanders, while the 64KB ISP Flash accommodates state-machine logic and communication stacks. The industrial temperature grade supports cabinet-mounted electronics, and the 1.8V-5.5V supply tolerates regulated 5V rails common in panel designs. Firmware can be updated in the field via ICSP using MPLAB SNAP, so the 32 general purpose registers and single-cycle ALU deliver deterministic 20MIPS throughput for real-time scanning loops, while read-while-write Flash enables data logging without halting execution.
Recommended
Metering and Instrumentation
Energy meters, water meters, and bench instrumentation benefit from the ATMEGA6450P-AUR's combination of 2KB EEPROM for calibration data and 64KB Flash for metrology firmware and display tables. The picoPower technology lowers battery drain in sleep mode for battery-powered meters, and the on-chip ADC inputs (per the ATmega family datasheet) directly sample sensor signals. The 100-TQFP 14x14 mm footprint provides enough pins for segment LCD drive via a companion driver or the LCD-capable ATMEGA6490P sibling when a display upgrade is planned. In-system programmable Flash allows recalibration firmware updates after final assembly, reducing manufacturing rework at production test stations.
Recommended
Appliance and White-Goods Control
Home appliance main boards use the ATMEGA6450P-AUR to scan touch or membrane keypads, drive motors and heaters through GPIO, and manage buzzer/LED user interfaces, all from one 100-pin device. The 1.8V-5.5V operating range and industrial temperature rating tolerate noisy mains-derived supplies and hot enclosures near ovens or boilers. The 64KB Flash holds safety-compliant firmware with margin for OTA-style service updates via ICSP, while picoPower modes cut standby draw to meet energy-efficiency expectations. Single-cycle RISC execution at up to 20MHz keeps zero-crossing detection and PWM timing loops deterministic without resorting to an external supervisor MCU, simplifying bill of materials and qualification.
Recommended
Human-Machine Interface (HMI) Boards
For LCD- and keypad-based HMI modules, the ATMEGA6450P-AUR offers the large I/O count and 4KB SRAM needed for frame buffers, font tables, and menu stacks, with the ATMEGA6490P variant available when a segment LCD controller is required on-chip. The 64KB read-while-write Flash supports multilingual string tables stored in program memory without an external EEPROM for code-size reasons, and the 2KB EEPROM retains user settings across power cycles. Designers can prototype with the same footprint across the 6450P/6490P/3250P family, so an HMI platform can scale memory up or down by swapping a single component without PCB respin, shortening development cycles considerably.
Recommended
Battery-Powered Portable Devices
Portable instruments and handheld devices exploit the ATMEGA6450P-AUR's picoPower sleep modes and 1.8V minimum supply, allowing operation directly from two alkaline cells or a single lithium cell via a simple regulator. At 20MHz the device delivers 20MIPS for burst processing, then drops into deep sleep between measurements to stretch battery life, per the picoPower features described on the Microchip product page. The 100-TQFP package supplies enough GPIO for buttons, indicators, and an external display interface simultaneously. The 4KB SRAM supports buffering of sensor bursts before a low-power radio or USB bridge offloads data, keeping the power-hungry radio asleep as long as possible.
Recommended
Educational and Prototyping Platforms
The ATmega6450P family is well suited to university labs and prototyping because the AVR core's single-cycle instruction set, 32 registers, and AVR-GCC/avrdude toolchain are widely documented, and ICSP programming needs only MPLAB SNAP plus two I/O pins and reset. The 64KB Flash is large enough for bootloader-based self-programming experiments, exercising the read-while-write capability directly. The 100-pin TQFP exposes nearly all buses and peripherals for oscilloscope study, unlike smaller 28-pin AVRs. Because drop-in family members share the same footprint, students can compare picoPower versus non-P variants or test 32KB versus 64KB builds on one board, teaching memory-budget trade-offs with a single PCB design.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA6450P-AUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA6450P-AU | ATMEGA6450A-AU | ATMEGA6490P-AUR | ATMEGA3250P-AUR |
|---|---|---|---|---|---|
| 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 |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB | 32 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB | 2 KB |
| Maximum Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| picoPower Technology | Yes | Yes | No | Yes | Yes |
| Integrated LCD Controller | No | No | No | Yes | No |
| 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 |
Key Differentiators
- picoPower low-power sleep modes (vs ATMEGA6450A-AU)
- Maximum 64KB Flash at lowest cost-per-bit in family (vs ATMEGA3250P-AUR)
- 20MHz full-speed grade (vs ATMEGA6450V-8AUR)
- Trade-off: no integrated LCD controller (vs ATMEGA6490P-AUR)
Design Notes
The ATMEGA6450P-AUR operates from 1.8V to 5.5V, but achievable clock frequency depends on supply voltage per the datasheet speed-versus-voltage curve. For a 20MHz crystal design, run at 4.5V-5.5V; at 3.3V, derate the clock or verify the safe operating region in the Atmel-8285 family datasheet before finalizing the oscillator choice. Use 100nF decoupling on each of the multiple VCC/GND pin pairs of the 100-TQFP plus a bulk 10uF, and connect all VCC pins - leaving a pair floating is a common field-failure cause.
The 100-TQFP (14x14 mm) has 0.5mm pin pitch; specify a solder-mask-defined land pattern per IPC guidance and route the 69 I/O lines with care on the two center rows. Reserve ICSP access (two I/O pins plus reset) on a 2x3 header so MPLAB SNAP can program and debug in-circuit; do not load those pins with strong pull-ups that fight the programmer. Keep the crystal within 10mm of the XTAL pins with short guarded traces for reliable startup across the industrial temperature range.
Migrating between ATmega6450P and ATmega6450A dies: the P (picoPower) variant has different sleep-mode current behavior and some fuse defaults, so re-verify fuse settings after a die swap even though the footprint is identical. Also confirm which family members reserve pins for the LCD controller (ATMEGA6490P) before reusing a board for that variant - LCD segment pins reduce available GPIO. Finally, EEPROM wear: 2KB EEPROM endurance is finite, so rate-limit parameter writes rather than logging high-frequency data to it.
Compliance Information
Compliance data was not stated in the provided web data; verify RoHS/REACH status on the Microchip product page or distributor certificate of conformance before order.
