ATMEGA1608-AF - 8-bit AVR MCU 20MHz 16KB Flash TQFP-32 | Microchip
MPN: ATMEGA1608-AF β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.28 | $1.28 |
| 10 | $1.15 | $11.50 |
| 100 | $1.02 | $102.00 |
| 500 | $0.94 | $470.00 |
| 1,000 | $0.86 | $860.00 |
ATMEGA1608-AF Overview
An 8-bit microcontroller (MCU) is a self-contained computing device that integrates a processor core, program memory, data memory, and peripherals on a single chip. In the power-management hierarchy of embedded systems, the MCU sits at the control layer, coordinating sensors, actuators, and communication interfaces. The megaAVR 0-series is the modernized successor to the classic ATmega family, sharing the AVR instruction set while adding new Core Independent Peripherals (CIPs).
Key features of the ATMEGA1608-AF include a 2-cycle hardware multiplier, single-cycle I/O access, up to 20 MIPS throughput at 20 MHz, and Core Independent Peripherals such as configurable custom logic (CCL), event system, and analog comparator. Wide-voltage operation from 3.3V to 5V allows the same board design to run on lithium, USB, or industrial 5V rails without a redesign.
Technically, the megaAVR 0-series uses the latest AVR core with a 4-stage pipeline, achieving an average of one instruction per cycle. Peripherals communicate via the Event System without CPU intervention, reducing interrupt latency and power consumption. Multi-level Flash locking and device IDs support functional-safety development flows required in industrial applications.
Typical applications include industrial automation control, HVAC and motor control panels, consumer appliances, and sensing nodes. The 32-pin TQFP provides sufficient GPIO for keypad scanning, LED driving, and multiple UART/SPI/I2C channels.
When designing with the ATMEGA1608-AF, note that programming is via the single-pin UPDI interface (shared with PA0), simplifying in-system programming to one pin plus ground - but requiring a UPDI-capable programmer rather than legacy ISP tools.
This page synthesizes distributor availability data, same-family drop-in alternatives, and practical design guidance not consolidated on the manufacturer product page.
Drop-in alternatives for ATMEGA1608-AF 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 ATMEGA1608-AF (same form factor and footprint) β differing in Core Processor, Peripherals, Supply Voltage Range.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA1608-AU
β Drop-Inβ In Stock
$0.86 / Unit
View Datasheet βATMEGA3208-AF
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$1.86 / Unit
View Datasheet βATMEGA4808-AF
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA808-AF
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA1608-AF Maximum Ratings & Electrical Characteristics
| Core Processor | AVR (megaAVR 0-series) |
| Core Size | 8-bit |
| Maximum Clock Frequency | 20 MHz |
| Flash Memory | 16 KB (16K x 8) |
| SRAM | 2 KB |
| EEPROM | 256 bytes |
| Supply Voltage Range | 3.3 V to 5 V |
| Package | 32-TQFP (7x7 mm) |
| Connectivity | UART, SPI, I2C |
| Peripherals | Hardware multiplier, CCL, Event System, WDT, ADC, analog comparator |
| Programming Interface | UPDI (single-pin) |
| Product Series | megaAVR 0 (ATmega808/809/1608/1609) |
| Functional Safety | FuSa capable |
| Mounting Type | Surface Mount |
| Packaging | Tray |
ATMEGA1608-AF 32-tqfp (7x7 mm) Pin Configuration Guide
Pin configuration for ATMEGA1608-AF (32-tqfp (7x7 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 ATMEGA1608-AF.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA1608-AF is suitable for 6 applications: Industrial Automation Control, HVAC and Appliance Control Panels, Sensor Nodes and Data Acquisition, Consumer Electronics and White Goods, Motor Control and Fan Drivers, Education and Prototyping Platforms.
Industrial Automation Control
The ATMEGA1608-AF fits industrial automation nodes such as actuator controllers, I/O expanders, and machine-state sequencers. Its 20 MHz AVR core with hardware multiplier executes PID and state-machine code with single-cycle I/O access, while the Event System routes peripheral signals without CPU intervention, cutting interrupt latency on time-critical lines. With 3.3V to 5V tolerance, it connects directly to 24V-referenced industrial I/O through simple level conditioning. The 32-pin TQFP supplies four GPIO ports for relay, sensor, and keypad interfacing. Program via UPDI on the production floor; the FuSa-capable positioning supports safety-assessed development flows.
Recommended
HVAC and Appliance Control Panels
Appliance and HVAC controllers benefit from the ATMEGA1608-AF's combination of 16 KB Flash (enough for menu-driven UI plus control logic), 256 bytes of EEPROM for stored user settings, and four GPIO ports for seven-segment displays, relays, and NTC sensor inputs. The internal ADC reads temperature sensors, and the Configurable Custom Logic (CCL) can gate heater or fan outputs independently of the CPU for fail-safe behavior. Wide 3.3V-5V operation tolerates supply sag from shared transformer rails, and the 20 MHz clock supports responsive touch or button scanning. UPDI programming allows firmware updates during service.
Recommended
Sensor Nodes and Data Acquisition
The ATMEGA1608-AF is a strong fit for wired sensor nodes: its UART, SPI, and I2C channels connect external ADCs, EEPROMs, and transceivers, while the internal 10-bit ADC handles local analog channels. The 2 KB SRAM buffers sample bursts, and the hardware multiplier accelerates digital filtering and scaling math at 20 MHz. Because the family shares one pinout across 8 KB to 48 KB Flash variants, a node designed around the ATMEGA1608-AF can migrate to the ATMEGA4808-AF if logging firmware grows, without a PCB respin. UPDI single-wire programming keeps field connectors small.
Recommended
Consumer Electronics and White Goods
In consumer products such as small appliances, chargers, and toys, the ATMEGA1608-AF offers a cost-effective 8-bit solution with modern peripherals. The 32-TQFP 7x7 mm footprint fits compact two-layer boards, and 16 KB Flash accommodates button UIs, LED animation, and communication protocols. Its wide 3.3V-5V supply range works from USB or battery-derived rails, and hardware multiplier support speeds up LED dimming math and checksum calculations. Low-power sleep modes extend battery life in portable derivatives. Availability across nine distributors per Octopart supports predictable consumer BOM sourcing.
Recommended
Motor Control and Fan Drivers
Small BLDC and brushed DC motor control panels use the ATMEGA1608-AF for PWM generation, tachometer input, and protection sequencing. Timer peripherals produce complementary PWM channels, the Event System can gate PWM on comparator trips within hardware latency, and the CCL implements basic safety interlocks without firmware. The 20 MHz clock provides fine PWM resolution for quiet fan operation, while the 2 KB SRAM holds commutation tables. Its FuSa-capable positioning assists fan and pump designs where stalled-rotor detection must be documented. External gate drivers handle the power stage.
Recommended
Education and Prototyping Platforms
The ATmega1608-AF is popular for embedded teaching and prototyping because it preserves the classic AVR programming model while introducing modern peripherals. The open-source MegaCoreX Arduino hardware package supports ATmega808/1608/3208/4808, giving students and engineers Arduino IDE workflows with the new core. Single-pin UPDI programming lowers tooling cost - even a DIY UART-based programmer works - and the 3.3V-5V range means the same board runs on both USB and bench supplies. The 32-pin TQFP is hand-solderable with basic practice, unlike BGA alternatives.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA1608-AF β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA1608-AU | ATMEGA3208-AF | ATMEGA4808-AF | ATMEGA808-AF |
|---|---|---|---|---|---|
| Package | 32-TQFP (7x7 mm) | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB | 16 KB | 32 KB | 48 KB | 8 KB |
| SRAM | 2 KB | 2 KB | 4 KB | 6 KB | 1 KB |
| Maximum Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Supply Voltage | 3.3 V to 5 V | 3.3 V to 5 V | 3.3 V to 5 V | 3.3 V to 5 V | 3.3 V to 5 V |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 128 bytes |
| Programming Interface | UPDI | UPDI | UPDI | UPDI | UPDI |
Key Differentiators
- Balanced memory tier in a pin-compatible family (vs ATMEGA808-AF)
- Headroom for firmware growth without redesign (vs ATMEGA3208-AF)
- Maximum Flash in the same 32-pin footprint (vs ATMEGA4808-AF)
Design Notes
Reserve the PA0/UPDI net for programming access: add a 100-470 ohm series resistor between the UPDI header and PA0 so the pin can still function as GPIO in application. Use a standard 3-pin UPDI header (VDD, UPDI, GND) so any Microchip SNAP/PICkit4 or DIY UPDI tool can service the board. Unlike legacy ATmega ISP designs, no crystal or reset header is required for programming since the family has an internal oscillator and hardware reset is managed via UPDI.
The ATMEGA1608-AF operates from 3.3V to 5V; decouple both supply pins with 100 nF ceramics placed within 2 mm of the TQFP power pins, plus one bulk 4.7-10 uF capacitor per rail. Do not drive analog references above VDD. Because active current scales with clock and voltage, systems targeting battery life should use the internal 32.768 kHz oscillator in standby sleep and wake to 20 MHz only for computation bursts.
The most common migration error is assuming classic ATmega pinout: the megaAVR 0-series relocates peripherals and uses UPDI instead of SPI ISP, so legacy ATmega328P programmers and ISP routines will not work. Verify peripheral-to-pin mapping in the datasheet's multiplexing table before layout. Also confirm the ordering suffix grade (AF vs AU) when qualifying second sources - same die, different temperature/packing specification.
For boards that may later migrate to ATMEGA3208-AF or ATMEGA4808-AF for more Flash, keep the full 32-pin footprint populated (no tied-off pins) so the pin-to-pin compatible variants drop on without rework. Route PA0-PA7 signals with UPDI accessibility and keep analog port traces away from PWM lines to protect ADC accuracy.
Compliance Information
RoHS and lead-free status consistent with current Microchip production MCU offerings; verify exact compliance certificates via Microchip's environmental documentation portal for your ordering suffix.
