ATMEGA6450-16AI - 8-bit AVR MCU 64KB Flash 16MHz | Microchip
MPN: ATMEGA6450-16AI ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.9 | $8.90 |
| 10 | $8.1 | $81.00 |
| 100 | $7.3 | $730.00 |
| 500 | $6.7 | $3,350.00 |
| 1,000 | $6.2 | $6,200.00 |
ATMEGA6450-16AI Overview
An 8-bit AVR microcontroller is a single-chip processor built around the AVR advanced RISC architecture, in which most of the 130 powerful instructions execute in a single clock cycle. Within the power-management hierarchy of an embedded system, the MCU sits at the top of the control chain, integrating program memory, data memory, timers, serial interfaces, and analog peripherals on one die, eliminating external glue logic for many designs.
Key features include the 130-instruction RISC core with 32 general-purpose working registers, 64KB self-programmable Flash with 32K x 16 organization, 2KB EEPROM for non-volatile parameter storage, and 4KB of internal SRAM. The device operates from a 5V supply in the industrial temperature range, and the -16AI speed grade confirms full 16MHz operation. In-System Programmability (ISP) allows firmware updates on the assembled PCB without removing the device.
Technically, the Harvard-architecture AVR core fetches instructions and data over separate buses, achieving close to 1 MIPS per MHz. The Flash memory supports 10,000 write cycles, and the EEPROM supports 100,000 cycles, providing durable field-calibration storage. On-chip debug and programming access through the SPI interface simplifies both development and production programming.
Typical applications include industrial control panels, instrumentation front ends, building automation nodes, and legacy AVR designs requiring high GPIO count in a 100-pin TQFP footprint. The large port count suits designs driving many LEDs, relays, or keypad matrices directly from the MCU.
Design consideration: at 5V and 16MHz the device is near its speed-voltage corner, so verify supply integrity with local decoupling at each VCC/GND pair and observe the 100-TQFP thermal pad layout for heat spreading.
This page synthesizes distributor availability, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATMEGA6450-16AI — 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 ATMEGA6450-16AI (same form factor and footprint) — differing in Operating Temperature, Package, Supply Voltage Range, EEPROM, SRAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA6450-16AU
✅ Drop-In✓ In Stock
$7.85 / Unit
View Datasheet →ATMEGA6450-16AUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.66 / Unit
View Datasheet →ATMEGA6490-16AI
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.85 / Unit
View Datasheet →ATMEGA3250-16AI
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.35 / Unit
View Datasheet →ATMEGA6450V-8AI
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.25 / Unit
View Datasheet →ATMEGA6450-16AI Maximum Ratings & Electrical Characteristics
| Core | AVR 8-bit RISC |
| Core Size | 8-bit |
| Maximum Clock Frequency | 16 MHz |
| Flash Program Memory | 64 KB (32K x 16) |
| SRAM | 4 KB |
| EEPROM | 2 KB |
| Supply Voltage | 5 V (speed grade -16) |
| Operating Temperature | -40C to +85C (industrial, suffix I) |
| Package | 100-TQFP (14x14 mm) |
| Mounting Type | Surface Mount |
| Instruction Set | 130 powerful instructions, most single-cycle |
| Programmability | In-System Programmable (ISP) Flash |
| Data Bus Width | 8 bit |
| Series | AVR ATmega |
ATMEGA6450-16AI 100-tqfp (14x14 mm) Pin Configuration Guide
Pin configuration for ATMEGA6450-16AI (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 ATMEGA6450-16AI.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA6450-16AI is suitable for 6 applications: Industrial Control Panels, Instrumentation and Test Equipment, Building Automation Nodes, Legacy AVR Design Continuity, Embedded HMI and Keypad Systems, Motor Control Supervision.
Industrial Control Panels
Industrial control panels demand an MCU that can scan many digital inputs, drive relays and indicators, and survive harsh thermal environments. The ATMEGA6450-16AI fits this role with its -40C to +85C industrial temperature rating, 5V noise-immune supply domain, and the large GPIO count afforded by the 100-TQFP package. Its 64KB In-System Programmable Flash allows control logic to be updated in the field over the SPI ISP interface, while the 2KB EEPROM retains setpoints and calibration through power loss. Running at 16MHz, the AVR core delivers roughly 16 MIPS, sufficient for deterministic polling loops and sequential state machines. Place the device near the I/O terminal blocks and decouple each VCC pin locally to tolerate relay coil transients on the shared 5V rail.
Recommended
Instrumentation and Test Equipment
Bench and field instrumentation requires stable non-volatile storage for calibration and enough program space for measurement algorithms. The ATMEGA6450-16AI provides 64KB Flash for complex firmware, 4KB SRAM for data buffering, and 2KB EEPROM dedicated to factory and field calibration constants, which survive 100,000 typical write cycles per the device family documentation. The 16MHz 8-bit core executes most of its 130 instructions in a single cycle, giving predictable timing for ADC sequencing and display refresh. The 100-pin TQFP exposes sufficient port width to drive segment displays, keypads, and status LEDs directly without port expanders. Design the analog reference and ground returns as a star from the MCU to keep the 5V digital supply noise out of measurement paths.
Recommended
Building Automation Nodes
Building automation controllers benefit from the ATMEGA6450-16AI's combination of Flash self-programming and industrial temperature tolerance. A zone controller can store its configuration in the 2KB EEPROM, update application logic via In-System Programming during maintenance windows, and drive dozens of damper actuators, occupancy inputs, and indicator outputs from the 100-TQFP port array. At 16MHz the AVR core comfortably runs communication stacks and scheduling loops concurrently in a cooperative firmware design. Because the device is a single 5V-supply MCU, power architecture stays simple: one rectified rail, local decoupling, and no level shifting in most sensor subsystems. Its 4KB SRAM supports logging buffers that are flushed to the EEPROM or an external memory on schedule.
Recommended
Legacy AVR Design Continuity
Many installed AVR designs built on the ATmega3250/6450/6490 family remain in production, and the ATMEGA6450-16AI is the natural continuity choice when 64KB of program space is required. The part keeps the exact 100-TQFP footprint and 16MHz 5V electrical profile of the family, so existing PCBs, programming fixtures, and ISP production flows carry over without redesign. The MegaCore open-source Arduino hardware package explicitly lists ATmega6450 support, which shortens firmware maintenance for designs that adopted Arduino-style tooling. When sourcing tightens, the ATMEGA6450-16AU green-package variant and the ATMEGA6490-16AI provide drop-in and upgraded substitutions on the same footprint, protecting long-lifecycle industrial product lines from supply disruption.
Recommended
Embedded HMI and Keypad Systems
Human-machine interface boards with large keypads, LED clusters, and status indicators map naturally onto the ATMEGA6450-16AI's high pin count. The 100-TQFP package provides enough port lines to implement a substantial keypad matrix and multi-digit indicator drive directly from GPIO, avoiding I/O expanders and their added latency and failure points. The 16MHz core scans matrices and debounces inputs with ample timing margin, while 64KB Flash holds menu structures, font tables, and multilingual strings. The 2KB EEPROM preserves user settings and backlight calibration across power cycles. Operate the device at 5V for robust signaling across cable harnesses in electrically noisy cabinets, and keep switch-return lines filtered to prevent false triggers from contact bounce and EMI.
Recommended
Motor Control Supervision
In motor-driven equipment, the ATMEGA6450-16AI serves as the supervision and sequencing controller that commands power stages and monitors feedback, rather than as the high-frequency PWM generator itself. Its 64KB Flash accommodates fault-logging, communication, and state-machine code, while single-cycle instruction execution at 16MHz provides responsive interrupt handling for overcurrent and stall-detection inputs. The industrial -40C to +85C rating matches cabinet environments near drives, and the 5V I/O tolerates the noisy grounding typical of power electronics. The 2KB EEPROM accumulates run-hour and trip counters across power cycles. Isolate the MCU ground from the power stage, route feedback signals differentially where possible, and use the ISP interface for safe field updates of protection logic.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA6450-16AI — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA6450-16AU | ATMEGA6490-16AI | ATMEGA3250-16AI | ATMEGA6450V-8AI |
|---|---|---|---|---|---|
| Package | TQFP-100 (14x14 mm) | TQFP-100 - same | TQFP-100 - same | TQFP-100 - same | TQFP-100 - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB (32K x 16) | 64 KB | 64 KB | 32 KB | 64 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 2 KB | 4 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 1 KB | 2 KB |
| Maximum Clock | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 8 MHz |
| LCD Controller | No | No | Yes | No | No |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Supply Voltage Class | 5V speed grade | 5V | 5V | 5V | 2.7V to 5.5V low-voltage |
Key Differentiators
- Full 64KB Flash without LCD overhead cost (vs ATMEGA6490-16AI)
- Double the program memory of the smaller family member (vs ATMEGA3250-16AI)
- Full-speed 16MHz grade vs low-voltage variant (vs ATMEGA6450V-8AI)
- Field-updatable firmware (vs Masked-ROM legacy MCUs)
Design Notes
The -16 speed grade requires a 5V-class supply for full 16MHz operation. Provide one 100nF ceramic capacitor per VCC/GND pin pair placed within a few millimeters of each pin, plus one bulk 10uF per supply domain. Estimated: if the core draws a typical tens-of-mA class current at 16MHz (per family datasheet typical figures), supply ripple must be kept well below the brown-out threshold, so enable the on-chip Brown-Out Detector for reliable operation in industrial environments with shared 5V rails.
The 100-TQFP (14x14 mm) has 0.5mm pin pitch, requiring solder-mask-defined or NSMD pads per the footprint guideline in the datasheet package section. Use a solid ground plane on layer 2 and tie the exposed thermal structure of the footprint to ground with a via array. Keep the crystal within 10-15mm of the XTAL pins with short guarded traces, and route ISP (SPI) programming lines to a header so the In-System Programming feature remains usable after final assembly.
Do not confuse family pinouts: ATmega6450 belongs to the ATmega3250/6450/6490 group, which differs from the ATmega640/1280/2560 group even though both come in 100-TQFP packages. Swapping families without verifying the port mapping will misroute I/O. Also, the -16AI grade is specified for 5V operation; running it from a 3.3V rail does not support the full 16MHz clock per the family speed-versus-voltage relationship, so downgrade the clock or select a V-variant instead.
With many GPIO switching simultaneously, the 100-pin package can produce significant ground bounce. Estimated: 20 outputs switching 20mA into 30pF loads at 10ns edges produce di/dt near 4 A/us per bank; a shared inductive ground return will ring. Distribute switching loads across ports, enable slew-rate limiting where the family peripheral supports it, and place at least one ground via close to each GND pin to minimize the return path loop area.
Compliance Information
Compliance status not stated in the retrieved web data; the ATMEGA6450-16AU variant is described in distributor data as a green (environmentally friendly) package. Verify RoHS/REACH status on the official Microchip product page before export-controlled sourcing.
