ATMEGA1609-AUR - 8-bit AVR MCU 20MHz 16KB Flash | Microchip
MPN: ATMEGA1609-AUR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.29 | $2.29 |
| 10 | $2.06 | $20.60 |
| 100 | $1.85 | $185.00 |
| 500 | $1.67 | $835.00 |
| 1,000 | $1.51 | $1,510.00 |
ATMEGA1609-AUR Overview
An 8-bit microcontroller (MCU) integrates a processor core, program memory, data memory, and peripherals such as timers, ADC, and communication interfaces on a single chip. The megaAVR 0-series sits in the general-purpose 8-bit MCU hierarchy (AVR core -> megaAVR -> microcontroller -> embedded processor) and is designed for real-time control, sensing, and connectivity tasks in cost-sensitive embedded systems.
Key features include the AVR RISC core with hardware multiplier for efficient arithmetic, Core Independent Peripherals (CIPs) such as the Configurable Custom Logic (CCL), Event System, and Watchdog Timer that operate without CPU intervention, a 10-bit ADC with up to 12 input channels, and multiple communication interfaces including SPI, TWI (I2C), and USART. The wide 1.8V to 5.5V supply range supports battery and industrial designs.
The megaAVR 0-series architecture combines a single-cycle I/O register file with the Event System, a routing network that lets peripherals signal each other directly, cutting latency and power versus software-driven solutions. The device also carries Functional Safety (FuSa) support documentation, easing IEC 61508 and ISO 13849 design flows.
Typical applications include industrial automation and motor control, home appliances and HVAC systems, and capacitive-touch or sensor-driven IoT nodes. The 20 MHz clock, 41 GPIO, and rich peripheral set fit compact control boards.
Design consideration: use the unified UPDI (single-pin) programming interface to free board space, and validate 20 MHz operation across your full supply and temperature range per the datasheet derating guidance.
This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for ATMEGA1609-AUR 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 ATMEGA1609-AUR (same form factor and footprint) β differing in Package, Core Processor, Number of I/O, RoHS Status, Series.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA1609-AFR
β Drop-Inβ In Stock
$1.87 / Unit
View Datasheet βATMEGA1608-AFR
β Drop-Inβ In Stock
$0.81 / Unit
View Datasheet βATMEGA1609-AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA3209-AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA4809-AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA809-AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA1609-AUR Maximum Ratings & Electrical Characteristics
| Core Processor | AVR 8-bit |
| Core Size | 8-bit |
| Maximum Clock Frequency | 20 MHz |
| Program Memory Size | 16 KB (16K x 8) FLASH |
| Data RAM Size | 2 KB |
| EEPROM Size | 256 bytes |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Number of I/O | 41 I/O |
| ADC Resolution | 10 bit |
| Package | 48-TQFP (7x7 mm) |
| Mounting Style | SMD/SMT |
| Series | megaAVR 0, Functional Safety (FuSa) |
| Connectivity | I2C, SPI, USART |
| Program Memory Type | FLASH |
| Product Category | 8-bit Microcontrollers - MCU |
| Base Product Number | ATMEGA1609 |
| RoHS Status | RoHS compliant (per distributor RoHS Details) |
| Packaging | Tape & Reel (TR) |
ATMEGA1609-AUR Pin Configuration
| Pin 1 | VDD β Power supply (1.8V to 5.5V) |
| Pin 2 | GND β Ground |
| Pin 3 | PB5 β Port B bit 5, digital I/O, analog/digital peripheral mux |
| Pin 4 | PB4 β Port B bit 4, digital I/O, analog/digital peripheral mux |
| Pin 5 | PB3 β Port B bit 3, digital I/O, analog/digital peripheral mux |
| Pin 6 | PB2 β Port B bit 2, digital I/O, analog/digital peripheral mux |
| Pin 7 | PB1 β Port B bit 1, digital I/O, analog/digital peripheral mux |
| Pin 8 | PB0 β Port B bit 0, digital I/O, analog/digital peripheral mux |
| Pin 9 | PA7 β Port A bit 7, digital I/O / ADC input |
| Pin 10 | PA6 β Port A bit 6, digital I/O / ADC input |
| Pin 11 | PA5 β Port A bit 5, digital I/O / ADC input |
| Pin 12 | PA4 β Port A bit 4, digital I/O / ADC input |
| Pin 13 | PA3 β Port A bit 3, digital I/O / ADC input |
| Pin 14 | PA2 β Port A bit 2, digital I/O / ADC input |
| Pin 15 | PA1 β Port A bit 1, digital I/O / ADC input |
| Pin 16 | PA0 β Port A bit 0, digital I/O / ADC input |
| Pin 17 | RESET/UPDI β Reset input or Unified Program Debug Interface |
| Pin 18 | VDDIO2 β Port C separate I/O supply |
| Pin 19 | GNDIO2 β Port C separate I/O ground return |
| Pin 20 | PF7 β Port F bit 7, digital I/O / ADC input |
| Pin 21 | PF6 β Port F bit 6, digital I/O / ADC input |
| Pin 22 | PF5 β Port F bit 5, digital I/O / ADC input |
| Pin 23 | PF4 β Port F bit 4, digital I/O / ADC input |
| Pin 24 | PF3/XTAL1 β Port F bit 3 or crystal input |
| Pin 25 | PF2/XTAL2 β Port F bit 2 or crystal output |
| Pin 26 | PF1 β Port F bit 1, digital I/O / ADC input |
| Pin 27 | PF0 β Port F bit 0, digital I/O / ADC input |
| Pin 28 | GND β Ground |
| Pin 29 | VDD β Power supply |
| Pin 30 | PC7 β Port C bit 7, digital I/O (VDDIO2 domain) |
| Pin 31 | PC6 β Port C bit 6, digital I/O (VDDIO2 domain) |
| Pin 32 | PC5 β Port C bit 5, digital I/O (VDDIO2 domain) |
| Pin 33 | PC4 β Port C bit 4, digital I/O (VDDIO2 domain) |
| Pin 34 | PC3 β Port C bit 3, digital I/O (VDDIO2 domain) |
| Pin 35 | PC2 β Port C bit 2, digital I/O (VDDIO2 domain) |
| Pin 36 | PC1 β Port C bit 1, digital I/O (VDDIO2 domain) |
| Pin 37 | PC0 β Port C bit 0, digital I/O (VDDIO2 domain) |
| Pin 38 | PD7 β Port D bit 7, digital I/O / ADC input |
| Pin 39 | PD6 β Port D bit 6, digital I/O / ADC input |
| Pin 40 | PD5 β Port D bit 5, digital I/O / ADC input |
| Pin 41 | PD4 β Port D bit 4, digital I/O / ADC input |
| Pin 42 | PD3 β Port D bit 3, digital I/O / ADC input |
| Pin 43 | PD2 β Port D bit 2, digital I/O / ADC input |
| Pin 44 | PD1 β Port D bit 1, digital I/O / ADC input |
| Pin 45 | PD0 β Port D bit 0, digital I/O / ADC input |
| Pin 46 | PE3 β Port E bit 3, digital I/O / ADC input |
| Pin 47 | PE2 β Port E bit 2, digital I/O / ADC input |
| Pin 48 | PE1 β Port E bit 1, digital I/O / ADC input |
Typical Applications
ATMEGA1609-AUR is suitable for 6 applications: Industrial Automation and Control, Home Appliances and HVAC, Capacitive Touch HMI Panels, IoT Sensor Nodes, Motor Control and Fan Drivers, Functional Safety Subsystems.
Industrial Automation and Control
The ATMEGA1609-AUR fits industrial control nodes because its Core Independent Peripherals and Functional Safety documentation support deterministic real-time behavior required by factory automation. The Configurable Custom Logic (CCL) can implement glue logic and safety interlocks in hardware, while the Event System routes timer and comparator signals without CPU latency, offloading tasks such as gate-drive timing and fault shutdown. The 10-bit ADC with 41 GPIO handles sensor acquisition and actuator outputs on one chip, and the 1.8V to 5.5V supply range tolerates industrial supply variation. Placing time-critical functions in CIPs reduces interrupt jitter, improving control-loop repeatability versus software-only implementations on conventional 8-bit MCUs.
Recommended
Home Appliances and HVAC
Appliance and HVAC boards benefit from the ATMEGA1609-AUR's low cost, wide 1.8V to 5.5V supply range, and rich peripheral set in a single 48-pin TQFP. The 20 MHz AVR core with hardware multiplier handles compressor or fan control algorithms, while the 10-bit ADC reads NTC thermistors and user potentiometers across 12 channels. The Watchdog Timer and BOD provide robust operation in noisy motor environments, and the Event System lets a TCB timer drive PWM outputs continuously even during firmware fault handling. With 16 KB Flash, both control logic and a user-interface state machine fit without banking, keeping the BOM to one MCU plus power components.
Recommended
Capacitive Touch HMI Panels
The megaAVR 0-series includes Microchip's capacitive-touch acquisition peripherals, making the ATMEGA1609-AUR a natural fit for touch buttons, sliders, and wheels on appliance and industrial HMI panels. The ADC-based touch sensing combined with hardware-driven acquisition timing minimizes CPU overhead, while the remaining Flash and GPIO drive LEDs, buzzers, and displays from the same device. Using one MCU for both touch sensing and application logic removes a dedicated touch controller from the BOM. The 48-pin TQFP provides enough I/O to multiplex an LCD segment driver over GPIO plus a USART or I2C link to a host, with the Event System enabling low-latency touch-response indication.
Recommended
IoT Sensor Nodes
For battery-powered IoT sensor nodes, the ATMEGA1609-AUR offers low-power sleep modes, a 1.8V minimum supply for direct lithium-cell operation, and integrated peripherals that reduce external component count. The node firmware typically sleeps in power-down with the RTC or PIT running, waking periodically to sample the 10-bit ADC, process data with the hardware multiplier, and transmit over a USART-linked radio module. With 16 KB Flash and 2 KB SRAM, protocol handling plus sensor filtering fits comfortably. The single-pin UPDI interface simplifies in-field firmware updates through one test point, and 41 GPIO allow direct drive of status LEDs, switches, and sensor power gating to cut quiescent current.
Recommended
Motor Control and Fan Drivers
The ATMEGA1609-AUR drives BLDC fans and small motors using its TCA timer PWM outputs and Event System-based fault shutdown. The CCL can gate PWM immediately on a comparator over-current event without software intervention, protecting the power stage in microseconds. The 20 MHz core with hardware multiplier executes commutation and speed-control loops, while the 10-bit ADC samples current shunts and back-EMF for sensorless schemes. The 48-pin TQFP leaves ample GPIO for hall sensors, tachometer input, and I2C communication to a host controller. Operating from a 5V rail derived from the motor supply, the MCU's BOD and WDT ensure safe restart after supply disturbances.
Recommended
Functional Safety Subsystems
As a member of Microchip's megaAVR 0-series Functional Safety (FuSa) family, the ATMEGA1609-AUR is intended for designs targeting safety standards, supported by Microchip's safety documentation package covering diagnostic coverage of the core, memory, and peripherals. Built-in mechanisms such as the CRC scan, WDT with window mode, BOD, and clock failure detection enable designers to implement safety functions like relay-test pulse supervision or sensor plausibility checking. The CCL and Event System allow independent hardware channels to cross-check software decisions, supporting structured diagnostic architectures on a single low-cost 8-bit device without a companion safety supervisor IC in many up-to-SIL-appropriate designs.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA1609-AUR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA1609-AFR | ATMEGA1608-AFR | ATMEGA3209-AU | ATMEGA4809-AU | ATMEGA809-AU |
|---|---|---|---|---|---|---|
| Package | 48-TQFP (7x7 mm) | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB | 16 KB | 16 KB | 32 KB | 48 KB | 8 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 4 KB | 6 KB | 1 KB |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Number of I/O | 41 I/O | 41 I/O | 41 I/O | 41 I/O | 41 I/O | 41 I/O |
| 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 | 1.8 V to 5.5 V |
| Qualification Grade | Standard industrial (FuSa supported) | Automotive (AEC-Q100) | Automotive (AEC-Q100) | Standard industrial | Standard industrial | Standard industrial |
| Packaging | Tape & Reel (AUR suffix) | Tape & Reel | Tape & Reel | Tray (AU) | Tray (AU) | Tray (AU) |
Key Differentiators
- Automotive-grade pin-compatible variant available (vs ATMEGA3209-AU)
- Balanced memory size at lowest cost in 48-pin family (vs ATMEGA4809-AU)
- Full 41-I/O pinout retained at smaller memory (vs ATMEGA809-AU)
- Core Independent Peripherals with FuSa documentation (vs ATMEGA1608-AFR)
Design Notes
Decouple both VDD pins (pins 1 and 29) and the VDDIO2 pin (pin 18) with 100 nF ceramic capacitors placed within 2 mm of each pin, plus a single 4.7 uF to 10 uF bulk capacitor per supply domain. The separated VDDIO2/GNDIO2 domain lets you switch Port C levels (for example, 3.3V logic to a 5V MCU host) without perturbing the main core supply - route its return separately to avoid ground bounce coupling ADC measurements on Port A/D inputs.
Keep the 10-bit ADC analog inputs (Port A, D, F analog channels) away from the crystal traces on PF2/PF3 and high-slew digital lines. Use a dedicated analog ground island connected at one point to the digital ground. For the 20 MHz external crystal, keep the loop area small: load capacitors (typ 12-22 pF, per crystal datasheet) within 3 mm of the pins. Enable the internal BOD and CRC scan via fuse settings for noise-tolerant or safety-oriented designs.
Do not confuse the AUR (Tape & Reel) and AU (tray) suffixes when qualifying assembly lines - pick-and-place programs need the reel orientation data only for the AUR. Verify the RESET/UPDI pin configuration early: programming via single-pin UPDI frees a GPIO but requires a UPDI-capable programmer (PICkit 4, SNAP, or MegaCoreX-supported serial adapter). Also confirm 20 MHz operation is valid across your full temperature and voltage range per the datasheet frequency-vs-voltage derating curves before finalizing clocking.
When using the USART or SPI at full speed with cables longer than 30 cm, add series termination (22-47 ohm) at the driver pins to control ringing, and consider slew-rate limiting on output pins via the PORT configuration registers. The Event System and CCL route internal signals that never leave the die, so prefer CIP-based timing chains over GPIO-toggled bit-banging for critical real-time signals to eliminate software jitter.
Compliance Information
RoHS compliance indicated by distributor RoHS Details (Xecor/LCSC listings). The AFR suffix variant (ATMEGA1609-AFR) is the AEC-Q100 automotive-qualified member of the same family. Request official REACH and conflict-minerals declarations from Microchip.
