ATMEGA6450-16AUR - 8-Bit AVR MCU 64KB Flash 16MHz | Microchip
MPN: ATMEGA6450-16AUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.42 | $7.42 |
| 10 | $6.9 | $69.00 |
| 100 | $6.42 | $642.00 |
| 500 | $6 | $3,000.00 |
| 1,000 | $5.66 | $5,660.00 |
ATMEGA6450-16AUR Overview
An 8-bit microcontroller integrates a processor core, program memory, data memory, and peripherals on a single silicon die. Within the power-management-and-embedded hierarchy, the AVR ATmega family sits in the 8-bit MCU class above entry-level 6-pin parts and below 32-bit ARM Cortex-M devices, offering deterministic single-cycle instruction execution for real-time control.
Key features include the advanced AVR RISC architecture with 130 powerful instructions, most executed in a single clock cycle; an 8-channel 10-bit analog-to-digital converter; a JTAG interface for on-chip debugging and boundary scan; and 68 programmable I/O lines across multiple GPIO ports. Up to 16 MIPS at 16 MHz gives the performance headroom typically expected from much larger processors while retaining 5V-tolerant I/O favored in industrial designs.
Architecturally, the device uses a Harvard structure with separate program and data buses, permitting single-cycle access to general-purpose working registers. In-system programmable Flash allows firmware updates over SPI after assembly, while the EEPROM retains calibration data through power cycles. Supply voltage spans 2.7V to 5.5V, with full 16MHz speed specified at 4.5V to 5.5V per the operating-ratings table.
Typical applications include industrial automation controllers, motor-control and HVAC boards, building access panels, and LCD-equipped instrumentation. The high pin count and broad peripheral set suit designs that need many I/O lines plus analog sensing in one MCU.
Design consideration: at 16MHz, full-speed operation requires a 4.5V to 5.5V supply, so 3.3V systems must select the lower-speed 8MHz speed grade instead.
This page synthesizes verified distributor pricing, drop-in family alternatives, comparison tables, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for ATMEGA6450-16AUR — 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 ATMEGA6450-16AUR (same form factor and footprint) — differing in RoHS Status, Operating Temperature, Package, EEPROM, SRAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA6450-16AI
✅ Drop-In✓ In Stock
$6.2 / Unit
View Datasheet →ATMEGA6490-16AUR
✅ Drop-In✓ In Stock
$8.45 / Unit
View Datasheet →ATMEGA640-16AUR
✅ Drop-In✓ In Stock
$5.9 / Unit
View Datasheet →ATMEGA3290P-20AUR
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →ATMEGA3290PA-AUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.95 / Unit
View Datasheet →ATMEGA6450-16AUR Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR 8-bit RISC |
| Program Memory (Flash) | 64 KB (32K x 16), ISP |
| SRAM | 4 KB |
| EEPROM | 2 KB |
| Maximum Clock Frequency | 16 MHz |
| Performance (MIPS) | 16 MIPS at 16 MHz |
| Instructions | 130 instructions, most single-cycle |
| Supply Voltage Range | 2.7 V to 5.5 V (16 MHz requires 4.5 V to 5.5 V) |
| ADC | 8-channel 10-bit |
| Debug Interface | JTAG (on-chip debug and boundary scan) |
| Programmable I/O | 68 lines |
| Package | 100-TQFP (14 x 14 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C |
| Data Bus Width | 8 Bit |
| Lifecycle Status | Active |
| RoHS Status | Compliant (green package, 'U' suffix) |
ATMEGA6450-16AUR 100-tqfp (14 x 14 mm) Pin Configuration Guide
Pin configuration for ATMEGA6450-16AUR (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 ATMEGA6450-16AUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA6450-16AUR is suitable for 6 applications: Industrial Automation Controllers, Building Access and Security Panels, HVAC and Building Automation, Instrumentation with Segment LCD, Motor Control and Power Monitoring, Prototyping and Legacy-Design Continuity.
Industrial Automation Controllers
The ATMEGA6450-16AUR is well matched to PLC-style I/O controllers because its 68 programmable GPIO lines and 16 MIPS AVR core let one MCU scan dozens of digital inputs and drive relays or indicators without port expanders. The 8-channel 10-bit ADC reads analog sensors such as potentiometers and current shunts directly, while the 64KB ISP Flash accommodates communication stacks and bootloader code. Running the 4.5V-5.5V full-speed grade natively on 24V-derived 5V rails eliminates level shifters common with 3.3V MCUs. Performance consideration: the single-cycle AVR instruction set gives deterministic scan timing, but at 16 MHz the part offers no hardware floating point, so scale integer math for control loops.
Recommended
Building Access and Security Panels
Door controllers and access panels benefit from the ATMEGA6450-16AUR's combination of high GPIO count for keypad rows, LED indicators, lock drivers, and reader interfaces, plus 2KB EEPROM that stores user credential tables and configuration through power loss. The 64KB Flash holds credential databases, Wiegand decoding, and firmware bootloaders for field updates over ISP. The 5V-tolerant I/O interfaces directly with legacy 5V reader hardware common in installed bases. Performance consideration: the JTAG interface enables production boundary-scan test of the dense 100-TQFP board and on-chip debugging during development, reducing bring-up time on security hardware where field failure is costly.
Recommended
HVAC and Building Automation
Rooftop-unit and zone controllers use the ATMEGA6450-16AUR's 8-channel 10-bit ADC to sample temperature sensors, humidity, and pressure transmitters, while ample GPIO drives dampers, contactors, and fan stages. The industrial -40C to +85C AUR grade tolerates unconditioned mechanical spaces, and the 5V supply rail matches the discrete sensor ecosystem widely deployed in HVAC retrofits. The 64KB Flash supports Modbus RTU and BACnet-MS/TP style protocol code with room for OTA firmware updates. Performance consideration: use the AVR's internal timer/PWM peripherals for valve and damper actuation timing so the 16 MHz core remains free for protocol handling and control-loop math.
Recommended
Instrumentation with Segment LCD
Test fixtures, panel meters, and handheld instruments exploit the ATmega6450/6490 family trait: the pin-compatible ATMEGA6490 variant adds a segment LCD controller, so a PCB designed around the ATMEGA6450-16AUR can be populated with either part to add glass display capability without redesign. The 10-bit ADC handles measurement channels while 68 GPIO manage button matrices, relays, and indicator LEDs. The 64KB Flash stores calibration tables in EEPROM-driven trim routines. Performance consideration: at 16 MIPS the AVR core comfortably updates multiplexed displays and computes scaling math, but interrupt-heavy display refresh should be timer-driven to keep ADC sampling jitter low for measurement accuracy.
Recommended
Motor Control and Power Monitoring
Fan, pump, and small-motor controllers use the ATMEGA6450-16AUR's timer/PWM peripherals to generate drive waveforms while the 10-bit ADC monitors current via shunt sensors and reads speed feedback. The 5V grade drives gate-driver inputs and optocoupler LEDs directly, simplifying isolation design versus 3.3V controllers. The 68 GPIO lines cover multi-motor boards with limit switches, interlocks, and status I/O in one MCU, reducing component count on mid-size boards. Performance consideration: the AVR lacks a hardware quadrature encoder interface, so decode encoder signals via pin-change interrupts - budget interrupt latency at 16 MHz and keep main-loop jitter low when closing speed loops.
Recommended
Prototyping and Legacy-Design Continuity
Because the ATmega6450 is explicitly supported by community toolchains such as MCUdude's MegaCore Arduino package on GitHub, the ATMEGA6450-16AUR is a productive platform for rapid prototyping on 5V industrial hardware with Arduino-style libraries. Long-lived industrial designs already committed to the AVR ATmega architecture use this 64KB, 100-pin part to extend memory headroom without changing the PCB ecosystem, toolchain, or programmer fleet (ISP and JTAG both supported). Performance consideration: 64KB Flash is self-limited by the 16-bit program counter space of this family, so code-heavy feature growth beyond that ceiling requires a different architecture - plan firmware size accordingly.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA6450-16AUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA6450-16AI | ATMEGA6490-16AUR | ATMEGA640-16AUR | ATMEGA3290P-20AUR |
|---|---|---|---|---|---|
| Package | 100-TQFP (14x14 mm) | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same | 100-TQFP (14x14) - 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 | 8 KB | 2 KB |
| Maximum Clock | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 20 MHz |
| Segment LCD Controller | No | No | Yes | No | Yes |
| ADC | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 10-channel 10-bit | 8-channel 10-bit |
| JTAG Debug | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Twice the Flash of the 32KB pin-compatible parts (vs ATMEGA3290P-20AUR)
- Pure GPIO without LCD pin commitment (vs ATMEGA6490-16AUR)
- Lowest-complexity 64KB family member (vs ATMEGA640-16AUR)
Design Notes
Design the supply rail at a regulated 5.0V, not 3.3V. The ATMEGA6450-16AUR speed grade runs at 16 MHz only within 4.5V to 5.5V per the operating-voltage table; below 4.5V the maximum guaranteed frequency drops. Budget decoupling of a 100nF ceramic capacitor at each VCC/AVCC pin pair plus bulk 10uF near the die; with roughly 100 package pins, distribute capacitors around the 14x14 mm TQFP rather than clustering them. Estimate: at 5V with moderate I/O loading the core draw stays in the tens of mA, but simultaneous 5V-tolerant GPIO sourcing on many lines can add tens of mA - check the datasheet I/O current limits per port when driving LEDs or optocouplers directly.
For ISP programming, route a 6-pin SPI header (MOSI, MISO, SCK, RESET, VCC, GND) with short traces and a series 10k pull-up on RESET. Keep the JTAG TAP pins (TCK, TMS, TDO, TDI) on test pads or a header because JTAG also provides boundary-scan test access across the 100-pin board - valuable for production fault coverage on dense TQFP assemblies. Place the 16 MHz crystal within a few millimeters of XTAL1/XTAL2 with ground guard traces, and load capacitors per crystal specification (typically 18-22 pF class - verify with your crystal vendor). Reserve ISP header access on production PCBs; losing it makes field firmware updates impossible.
Three pitfalls recur on this part. First, pin-count confusion: distributor listings cite 53 I/O while Microchip states 68 - always verify port-to-pin mapping against the manufacturer datasheet pinout table before routing, not third-party summaries. Second, temperature-grade ordering: the AUR suffix covers the industrial range; do not substitute lower-grade tray parts into -40C applications without verifying the grade letter. Third, EEPROM endurance: 2KB EEPROM has a finite erase/write cycle budget, so avoid logging high-frequency counters to EEPROM; buffer in SRAM and commit periodically. Migrating from ATMEGA3290-class parts to this 64KB part requires checking peripheral register maps, since family members differ in peripheral allocation.
Compliance Information
RoHS-compliant green package implied by the 'U' suffix per distributor listings (green package, RoHS). REACH, halogen-free, and conflict-minerals status not stated in provided data.
