ATMEGA6450P-AU - 8-bit AVR MCU 64KB Flash 20MHz | Microchip
MPN: ATMEGA6450P-AU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.95 | $8.95 |
| 10 | $8.12 | $81.20 |
| 100 | $7.3 | $730.00 |
| 500 | $6.55 | $3,275.00 |
| 1,000 | $5.9 | $5,900.00 |
ATMEGA6450P-AU Overview
An 8-bit AVR ATmega microcontroller is a Harvard-architecture RISC processor that connects 32 general-purpose working registers directly to the ALU, allowing most instructions to execute in a single clock cycle. Within the power-management hierarchy, it integrates flash program memory, SRAM, EEPROM, timers, communication peripherals, and analog functions into a single chip, replacing multi-chip solutions in embedded systems.
Key features include 130 powerful instructions with mostly single-cycle execution, read-while-write flash capability, 54/69 general-purpose I/O lines, and a JTAG interface for boundary-scan and on-chip debugging. The picoPower technology delivers very low power consumption in sleep modes, important for battery-powered designs.
Technical depth: the AVR core achieves throughputs up to 10x faster than conventional CISC microcontrollers at equivalent clock rates. The device provides three flexible timer/counters with compare modes, internal and external interrupt sources, and serial peripherals including USART, SPI, and two-wire interface (per the ATmega6450P family datasheet summary).
Typical applications include industrial control panels with keypad and LCD interfaces, building automation and HVAC controllers, and instrumentation front ends that leverage the large GPIO count of the 100-pin TQFP package.
Design consideration: verify the maximum clock rating against supply voltage - higher frequencies require higher VCC, so a design targeting 20 MHz operation must run at the upper portion of the 2.7V to 5.5V range.
This page synthesizes distributor pricing, drop-in alternatives within the ATmega 100-pin family, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATMEGA6450P-AU 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 ATMEGA6450P-AU (same form factor and footprint) β differing in Working Registers, Core Architecture, Flash Memory, SRAM, General Purpose I/O.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA6450A-AU
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$5.95 / Unit
View Datasheet βATMEGA6490P-AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA6490A-AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA2560-AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA1281-AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA6450P-AU 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 |
| Maximum Clock Frequency | 20 MHz |
| I/O Lines | 54/69 general purpose I/O |
| Working Registers | 32 general purpose |
| Instruction Set | 130 powerful instructions, most single-cycle |
| Debug/Programming Interface | JTAG (boundary-scan, on-chip debug/programming) |
| Flash Read-While-Write | Yes |
| Low Power Technology | picoPower |
| Package | 100-TQFP (14x14 mm) |
| Mounting Type | Surface Mount |
| Number of Pins | 100 |
| Timers/Counters | Three flexible timer/counters with compare modes |
| RoHS Status | Compliant |
ATMEGA6450P-AU 100-tqfp (14x14 mm) Pin Configuration Guide
Pin configuration for ATMEGA6450P-AU (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-AU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA6450P-AU is suitable for 6 applications: Industrial Control Panels, Building Automation and HVAC Controllers, Instrumentation and Test Equipment, Keypad and Human-Machine Interface Boards, Motor Control and Actuator Systems, IoT Sensor Nodes and Data Loggers.
Industrial Control Panels
The ATMEGA6450P-AU fits industrial control panel designs because its 54/69 GPIO lines and 100-pin TQFP footprint directly address the high point-count needs of button matrices, relay banks, and indicator clusters. The 20 MHz single-cycle AVR core provides roughly 20 MIPS for deterministic scan loops, while 64 KB ISP Flash accommodates feature-rich firmware with over-the-air-style field upgrades via ISP. Three flexible timer/counters with compare modes generate PWM for actuator control, and the JTAG interface enables boundary-scan test of assembled panels plus on-chip debugging during development. picoPower sleep modes reduce standby draw in always-on panels.
Recommended
Building Automation and HVAC Controllers
In HVAC and building automation controllers, the ATMEGA6450P-AU offers the memory and I/O density needed for sensor polling, damper/valve actuation, and communication. The 4 KB SRAM supports protocol stacks and logging buffers, while 2 KB EEPROM retains calibration and configuration data through power cycles without external memory. picoPower technology cuts sleep current in battery-backed or standby scenarios, and the internal EEPROM and Flash read-while-write support runtime data logging. USART, SPI, and two-wire serial peripherals link the MCU to RS-485 transceivers and sensor front ends in a 100-TQFP single-chip design.
Recommended
Instrumentation and Test Equipment
Bench instrumentation benefits from the ATMEGA6450P-AU's combination of JTAG on-chip debugging, 20 MHz throughput, and generous GPIO for front-panel encoders, displays, and range switching. The 64 KB Flash supports menu systems, calibration tables, and USB/serial command parsing; 4 KB SRAM buffers measurement data streams. Three timer/counters with compare modes generate precise gating and PWM stimulus, and the AVR core's single-cycle register access simplifies latency-critical sampling routines. The 100-pin TQFP (14x14 mm) package keeps the layout compact while exposing up to 69 I/O signals for mixed digital/analog front-end control.
Recommended
Keypad and Human-Machine Interface Boards
For HMI boards combining keypads, LEDs, and menu-driven menus, the ATMEGA6450P-AU's large I/O count eliminates port expanders: a 8x8 key matrix plus dozens of indicator LEDs fit comfortably on the 54/69 GPIO lines. Interrupt-on-change and pin-change interrupt sources deliver responsive key wake-up from picoPower sleep modes, extending battery life in wireless HMI designs. The 64 KB Flash stores multi-language fonts and graphics routines, and EEPROM stores user settings. If direct segment-LCD driving is required, the pin-compatible ATMEGA6490P-AU variant adds an on-chip LCD controller without PCB redesign.
Recommended
Motor Control and Actuator Systems
The ATMEGA6450P-AU supports small motor and actuator control using its three timer/counters with compare modes to produce complementary PWM channels with dead-time style sequencing, while the 20 MHz core executes closed-loop feedback algorithms within tight scan periods. The AVR's hardware interrupt structure allows encoder edge counting without software polling, and the 4 KB SRAM holds PID state for multiple axes. JTAG debugging accelerates tuning of control loops during development, and picoPower sleep reduces idle consumption between motion commands. Gate-driver companion ICs on the same board complete the power stage.
Recommended
IoT Sensor Nodes and Data Loggers
Battery-powered sensor nodes exploit the ATMEGA6450P-AU's picoPower sleep modes and single-chip integration: 64 KB Flash stores the application plus data compaction code, 2 KB EEPROM logs thresholds and counters, and 4 KB SRAM buffers sensor bursts before radio transmission. The two-wire interface and SPI connect environmental sensors, while USART links a modem or RS-485 transceiver. Pin-change interrupts wake the core from deep sleep on sensor events or scheduled RTC ticks, and the 100-TQFP's rich analog and digital pin muxing supports multi-sensor designs on one PCB without glue logic.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA6450P-AU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA6450A-AU | ATMEGA6490P-AU | ATMEGA6490A-AU | ATMEGA2560-AU | ATMEGA1281-AU |
|---|---|---|---|---|---|---|
| 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 |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB ISP Flash | 64 KB | 64 KB | 64 KB | 256 KB | 128 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB | 8 KB | 8 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 2 KB | 4 KB | 4 KB |
| picoPower Low-Power Technology | Yes | No (standard power) | Yes | No (standard power) | No | No |
| Integrated LCD Controller | No | No | Yes | Yes | No | No |
| JTAG Interface | Yes | Yes | Yes | Yes | Yes | Yes |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 16 MHz | 16 MHz |
Key Differentiators
- picoPower low-power technology (vs ATMEGA6450A-AU)
- Full-speed 20 MHz operation in this memory class (vs ATMEGA2560-AU)
- No wasted LCD controller die area (vs ATMEGA6490P-AU)
Design Notes
Verify the voltage-versus-frequency safe operating region before committing to 20 MHz: on megaAVR parts the maximum clock depends on VCC, so 20 MHz designs must run at the upper end of the supply range. Decouple VCC/AVCC with 100 nF ceramics at each pin pair plus bulk 10 uF, and keep AVCC fed through an LC filter if you use the ADC - analog noise on AVCC directly degrades conversion accuracy on this 10-bit-class AVR.
The 100-TQFP (14x14 mm) package places fine 0.5 mm-pitch leads on all four sides; use a 0.2 mm stencil with 80-90% aperture reduction to prevent solder bridging, and route the JTAG (TDI/TDO/TMS/TCK) header traces first since they double as boundary-scan test access. Place the ISP header at the board edge for field reprogramming, and keep crystal traces short with guard ground for stable 20 MHz operation.
Do not assume ATMEGA6450A and ATMEGA6450P are interchangeable without checking power budgets: the 'P' picoPower variant achieves far lower sleep currents, and designs sized around it may exceed battery budget with the 'A' variant. Also note the 6450P lacks the LCD controller present on the 6490P - if a display was planned, switching requires the 6490P. Finally, code compiled for larger-memory 2560/1281 drop-ins uses different memory maps and must be revalidated.
Compliance Information
RoHS compliant and lead-free per Microchip product listing ('-AU' RoHS package suffix). REACH, halogen-free, and conflict-minerals status not stated in provided data - consult Microchip's material declaration for the specific lot.
