ATMEGA1608-AFR - 8-bit AVR MCU 20MHz 16KB Flash | Microchip
MPN: ATMEGA1608-AFR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.35 | $1.35 |
| 10 | $1.21 | $12.10 |
| 100 | $1.08 | $108.00 |
| 500 | $0.97 | $485.00 |
| 1,000 | $0.88 | $880.00 |
| 3,000 | $0.81 | $2,430.00 |
ATMEGA1608-AFR Overview
A microcontroller unit (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and peripherals into one chip, forming the lowest level of the embedded computing hierarchy: transistor -> logic IC -> processor -> microcontroller -> embedded system. The megaAVR 0-series is Microchip's modernized AVR family built on the latest core technology with Core Independent Peripherals (CIPs) that operate without CPU intervention.
Key features of the ATMEGA1608 include the AVR RISC architecture with hardware multiplier executing most instructions in a single cycle, up to 20 MHz operation delivering approximately 20 MIPS of throughput, 16 KB of self-programmable Flash for code storage, and 256 bytes of EEPROM for non-volatile parameter retention. The FuSa (Functional Safety) variant documentation support makes it suitable for safety-oriented designs.
The peripheral set of the megaAVR 0-series typically includes multi-pin PWM channels, event system interconnect, USARTs, SPI and TWI (I2C) serial interfaces, an ADC, analog comparators, and flexible port interrupt logic, allowing the 32-pin device to control systems with minimal external components.
Typical applications include industrial automation nodes, home-appliance and HVAC control boards, motor-adjacent control logic, and general-purpose embedded systems that need 8-bit simplicity with modern peripherals. The 32-pin TQFP provides a good balance of GPIO count and board area.
Design consideration: program the device via the single-wire UPDI interface; plan board space for a stable clock source and decoupling per the ATmega808/809/1608/1609 family datasheet (DS40002172).
This page synthesizes verified distributor data, drop-in family alternatives, and practical design guidance not found in the manufacturer datasheet alone.
Drop-in alternatives for ATMEGA1608-AFR 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-AFR (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:
ATMEGA3208-AFR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA808-AFR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA4808-AFR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA1608-AU
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$0.86 / Unit
View Datasheet βATMEGA1609-AFR
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$1.87 / Unit
View Datasheet βATMEGA1608-AFR Maximum Ratings & Electrical Characteristics
| Core Processor | AVR (8-bit RISC) |
| Series | megaAVR 0-series, Functional Safety (FuSa) |
| Core Size | 8-Bit |
| Maximum Clock Frequency | 20 MHz |
| Flash Memory Size | 16 KB (16K x 8) |
| SRAM Size | 2 KB |
| EEPROM Size | 256 bytes |
| Supply Voltage | 3.3 V / 5 V |
| Package | 32-TQFP (7 x 7 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +125C (Industrial) |
| Packaging | Tape & Reel (TR) |
| Programmability | UPDI (Unified Program and Debug Interface) |
| Hardware Multiplier | Yes |
| Functional Safety Support | Yes (FuSa) |
| RoHS Status | Green (RoHS compliant per FindIC listing) |
| Product Status | Active |
ATMEGA1608-AFR 32-tqfp (7 x 7 mm) Pin Configuration Guide
Pin configuration for ATMEGA1608-AFR (32-tqfp (7 x 7 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-AFR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA1608-AFR is suitable for 6 applications: Industrial Automation Nodes, Home Appliance and HVAC Control, Motor-Adjacent Control Logic, Embedded Sensing and IoT End Nodes, Human Interface and Display Control, Safety-Oriented Control Functions.
Industrial Automation Nodes
The ATMEGA1608-AFR fits industrial sensor and actuator nodes because its -40C to +125C industrial rating survives cabinet and machine-floor environments, and its Core Independent Peripherals keep timers, PWM, and communication running even if the CPU stalls. With 20 MHz execution and a hardware multiplier, it handles simple control loops and protocol conversion (UART to SPI or I2C) deterministically. Placed on a 5 V industrial board, its 5 V-tolerant I/O eliminates level-shifting to PLC-style signals, while 256 bytes of EEPROM retain calibration constants across power cycles without external NVM.
Recommended
Home Appliance and HVAC Control
Appliance and HVAC boards benefit from the ATMEGA1608-AFR's combination of 16 KB Flash (enough for button handling, display driving, and simple state machines), 2 KB SRAM, and rich PWM capability from the megaAVR 0-series timer set. The 20 MHz core with hardware multiplier accelerates sensor math such as NTC thermistor linearization. Its Functional Safety (FuSa) documentation support helps appliance makers document failure modes for compliance. Operating from a 5 V supply improves noise immunity in motor-heavy enclosures, and the 32-pin TQFP offers enough GPIO for relays, keys, and a segment LCD driver interface.
Recommended
Motor-Adjacent Control Logic
In systems with a dedicated motor driver or smart power stage, the ATMEGA1608-AFR serves as the supervisory controller generating PWM commands and monitoring feedback. The megaAVR 0-series multi-pin PWM outputs drive gate-driver inputs at up to 20 MHz timing resolution, while the internal ADC reads current-sense amplifiers for closed-loop limiting. Event System routing lets peripherals react to comparator trips without CPU latency, a key safety behavior for over-current shutdown. The 125C ambient rating keeps the MCU alive in enclosures near power electronics, and UPDI allows field firmware updates through a single wire.
Recommended
Embedded Sensing and IoT End Nodes
Battery-adjacent and wired IoT end nodes use the ATMEGA1608-AFR's low-power design modes and Core Independent Peripherals to sample sensors and wake the CPU only on events. The 16 KB Flash holds a full sensor-fusion or protocol stack, while 256 bytes of EEPROM store device identity and calibration. USART, SPI, and TWI interfaces connect directly to RF modules or Ethernet-adjacent bridges without glue logic. Because the megaAVR 0-series is supported by MegaCoreX in the Arduino ecosystem, prototyping and regression testing are fast, and the 32-pin TQFP keeps node PCB area small for compact enclosures.
Recommended
Human Interface and Display Control
The ATMEGA1608-AFR drives keypads, rotary encoders, LED matrices, and small display interfaces in front-panel controllers. Its port interrupt structure handles debounced key detection in hardware, and hardware PWM provides flicker-free backlight dimming. At 20 MHz with single-cycle instructions, scanning a 4x4 matrix plus updating a segment display consumes little CPU budget, leaving headroom for communication with a main controller over UART. The 3.3 V/5 V supply flexibility lets one firmware image serve both logic-level panels and industrial 5 V front boards, and the industrial temperature range covers outdoor terminal housings.
Recommended
Safety-Oriented Control Functions
The -AFR suffix denotes the Functional Safety (FuSa) documentation package of the megaAVR 0-series, which supports developers building systems toward functional-safety processes by providing failure-mode documentation and safety manuals. The ATMEGA1608-AFR's Core Independent Peripherals enable hardware watchdogs, windowed monitoring, and cross-checking logic that reduces dependence on software correctness. Typical uses include burner control, pump interlocks, and simple safety-relevant monitoring functions, where 256 bytes of EEPROM log fault events and the 20 MHz deterministic core executes diagnostic routines within defined timing windows.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA1608-AFR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA3208-AFR | ATMEGA808-AFR | ATMEGA4808-AFR | ATMEGA1609-AFR |
|---|---|---|---|---|---|
| Package | 32-TQFP (7 x 7 mm) | 32-TQFP (7 x 7 mm) - same | 32-TQFP (7 x 7 mm) - same | 32-TQFP (7 x 7 mm) - same | TQFP (40/48-pin options) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB | 32 KB | 8 KB | 48 KB | 16 KB |
| SRAM | 2 KB | 2 KB | 1 KB | 4 KB | 2 KB |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Core | AVR 8-bit with hardware multiplier | AVR 8-bit | AVR 8-bit | AVR 8-bit | AVR 8-bit |
| Programming Interface | UPDI | UPDI | UPDI | UPDI | UPDI |
| Functional Safety (FuSa) Support | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
Key Differentiators
- Functional Safety (FuSa) documentation variant (vs ATMEGA1608-AU)
- Lowest-cost same-footprint option in family (vs ATMEGA4808-AFR)
- SRAM headroom over entry part (vs ATMEGA808-AFR)
- 32-pin footprint discipline (vs ATMEGA1609-AFR)
Design Notes
Place a 100 nF ceramic decoupling capacitor directly across VDD/GND of the ATMEGA1608-AFR, plus a bulk 4.7 uF to 10 uF capacitor near the supply entry, following the power recommendations in the ATmega808/809/1608/1609 family datasheet (DS40002172C). Keep the UPDI trace routable to a 3-pad or Tag-Connect footprint for production programming - UPDI needs only one signal wire plus ground, so reserve a single test point. The 32-pin TQFP land pattern should follow IPC-7351 recommendations; note that pin-compatible megaAVR 0-series parts (ATmega808/3208/4808) share this footprint for supply-chain flexibility.
Do not assume classic ATmega328P ISP programming: the megaAVR 0-series programs exclusively through UPDI, and legacy ISP/HDW programmers will not work - plan tooling (PICkit 4, SNAP, or Atmel-ICE) accordingly. Also confirm the exact supply range and maximum ratings from the family datasheet before running from unregulated supplies; the AFR industrial part is rated -40C to +125C but junction temperature, not ambient alone, limits reliability. Finally, EEPROM endurance is finite - implement wear-leveling if calibration data is rewritten frequently.
Use the Event System instead of software polling for time-critical peripheral-to-peripheral signals (comparator trips, timer captures), because CIP routing avoids interrupt latency and jitter. When driving long wires or cables from port pins, add series resistors (typically 33 to 100 ohm) to slow edges and reduce EMI; the 20 MHz single-cycle core produces fast edges that radiate if unterminated. Keep the ADC analog reference path clean by separating analog supply filtering and routing sensitive analog traces away from the PWM outputs.
Estimated: a 5 V design with the MCU sourcing 20 mA of GPIO loads at 20 MHz dissipates on the order of tens of milliwatts internally, so heatsinking is unnecessary; the thermal budget is dominated by external loads, not the ATMEGA1608-AFR itself. Verify actual current figures against the family datasheet electrical characteristics table (DS40002172C) for your clock/voltage combination, and budget sleep-mode current if the node is battery-powered.
Compliance Information
FindIC listing describes the ATMEGA1608-AFR as 'Green' (RoHS compliant, lead-free). REACH, halogen-free, and conflict-minerals status not stated in provided data.
