ATMEGA164PA-ANR - 8-bit AVR MCU, 16KB Flash, 20MHz | Microchip
MPN: ATMEGA164PA-ANR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.64 | $1.64 |
| 10 | $1.52 | $15.20 |
| 100 | $1.38 | $138.00 |
| 500 | $1.24 | $620.00 |
| 1,000 | $1.1 | $1,100.00 |
ATMEGA164PA-ANR Overview
A microcontroller unit (MCU) integrates a processor core, memory, and peripherals on a single silicon die, forming the lowest layer of the embedded-system hierarchy (MCU -> embedded processor -> semiconductor). The AVR architecture executes most instructions in a single clock cycle, delivering throughput approaching 1 MIPS per MHz, which lets system designers trade processing speed directly against power consumption.
Key features include 32 general purpose I/O lines, 32 general purpose working registers, an real-time counter, three flexible timer/counters with compare modes and PWM outputs, two USARTs, a byte-oriented Two-Wire serial interface (TWI/I2C), and an 8-channel 10-bit ADC. The picoPower technology family supports multiple sleep modes for battery-powered designs operating from 1.8V to 5.5V.
Technical depth: the AVR enhanced RISC core pairs 135 instructions with the 32-register file, giving fast context switching and high code density. In-System Programming (ISP) with read-while-write flash allows firmware updates without removing the device, and debugWIRE in-circuit debugging is accessed through the reset line.
Typical applications include industrial automation and sensor nodes, consumer appliances and HVAC control, and battery-powered metering where the picoPower sleep modes minimize average current draw.
Design consideration: decouple all VCC and AVCC pins with 0.1 uF ceramics and keep the ADC analog supply separate from digital switching noise to preserve 10-bit ADC accuracy.
This page synthesizes distributor pricing as of 2026-09-16, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATMEGA164PA-ANR 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 ATMEGA164PA-ANR (same form factor and footprint) β differing in ADC, Package, EEPROM, SRAM, Supply Voltage Range.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA164A-AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA324PA-AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA644PA-AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA1284P-AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA16-16AU
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$4.41 / Unit
View Datasheet βATMEGA1284-AUR
β Drop-Inβ In Stock
$4.61 / Unit
View Datasheet βATMEGA164PA-ANR Maximum Ratings & Electrical Characteristics
| Core | AVR 8-bit RISC |
| Flash Memory | 16 KB (8K x 16) ISP, read-while-write |
| EEPROM | 512 B |
| SRAM | 1 KB |
| Maximum Clock Frequency | 20 MHz |
| Supply Voltage Range | 1.8 V to 5.5 V |
| I/O Count | 32 general purpose I/O lines |
| Timers/Counters | 3 flexible timer/counters with compare modes and PWM |
| USART | 2 |
| Serial Interfaces | Two-Wire serial interface (TWI/I2C), SPI, 2x USART |
| ADC | 8-channel 10-bit |
| MIPS per MHz | Approaching 1 MIPS/MHz (single-cycle execution) |
| Low Power Technology | picoPower with multiple sleep modes and real-time counter |
| Programming/Debug | In-System Programming (ISP), debugWIRE via reset line |
| Package | 44-TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Packing | Tape and Reel (T/R) |
| RoHS Status | Compliant (GRN / green per Mouser listing) |
ATMEGA164PA-ANR 44-tqfp (10x10 mm) Pin Configuration Guide
Pin configuration for ATMEGA164PA-ANR (44-tqfp (10x10 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 ATMEGA164PA-ANR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA164PA-ANR is suitable for 6 applications: Industrial Automation and Control, Battery-Powered Sensor Nodes, Consumer Appliances and HVAC Control, Metering and Energy Monitoring, Hobby, Maker, and Educational Platforms, Networking and Communication Accessories.
Industrial Automation and Control
The ATMEGA164PA-ANR fits industrial control nodes because its 32 GPIO lines drive relays, optocouplers, and status LEDs directly, while the three timer/counters generate PWM outputs for actuator and motor speed control without CPU overhead. The two USARTs allow one channel to communicate with a PLC or SCADA link (Modbus over RS-485 via a transceiver) while the second services a local HMI or configuration terminal. The 8-channel 10-bit ADC reads analog process variables such as pressure, temperature, and potentiometer setpoints with roughly 1 mV-class resolution at 5V supply. Operating from 1.8V to 5.5V at up to 20 MHz, it tolerates noisy industrial rails, and the 512 B EEPROM stores calibration and configuration data across power cycles without external NVM.
Recommended
Battery-Powered Sensor Nodes
For battery-operated sensing products, the picoPower technology of the ATMEGA164PA-ANR is the decisive parameter: multiple sleep modes with an asynchronous real-time counter allow the MCU to sleep in the low-microamp class between measurements while keeping a time base alive. A typical duty cycle wakes the part on timer interrupt, samples one or more of the 8 ADC channels measuring temperature, humidity, or voltage, and transmits the packet over USART to a wireless module before returning to sleep. The wide 1.8V to 5.5V supply range lets the design run directly from two alkaline cells or a single lithium cell via a simple LDO, extending battery life. The 16 KB flash comfortably holds a lightweight sensor-firmware image with sensor linearization tables in EEPROM.
Recommended
Consumer Appliances and HVAC Control
White goods, fan coils, and HVAC boards benefit from the ATMEGA164PA-ANR's blend of PWM generation, TWI (I2C) bus for user-interface peripherals, and 10-bit ADC for NTC thermistor reading. The three timer/counters with compare modes independently drive PWM channels for blower speed, damper servo positioning, and backlight dimming, while hardware TWI communicates with display drivers, EEPROM, and capacitive-touch controllers on the front panel. The 20 MHz clock provides enough headroom for PI control loops at typical 10-100 Hz HVAC update rates with margins for communication handling. Its wide 1.8V-5.5V input range and industrial-grade AVR robustness simplify qualification across 3.3V and 5V platform variants of the same appliance board.
Recommended
Metering and Energy Monitoring
Energy meters and submetering nodes use the ATMEGA164PA-ANR's 8-channel 10-bit ADC to sample voltage and current channels, computing RMS power in software; the 20 MHz single-cycle AVR core provides sufficient instruction throughput for fixed-point DSP-style accumulation at 50/60 Hz line frequencies. The 512 B EEPROM preserves cumulative energy registers, tamper flags, and calibration coefficients through brownouts and power loss, a critical metering requirement. The two USARTs allow a primary RS-485/Modbus communication channel plus a secondary optical or service port for calibration in the field. The picoPower sleep modes also suit battery-backed or energy-harvesting meter variants where standby current is budgeted in microamps.
Recommended
Hobby, Maker, and Educational Platforms
The AVR ecosystem, free Microchip Studio/AVR-GCC toolchain, and ubiquitous ISP programmers make the ATMEGA164PA-ANR attractive for educational boards and open hardware. Its 32 I/O and dual USART allow a single MCU to drive LCDs, keypads, and a debug console simultaneously, and the familiar ATmega architecture matches the enormous base of AVR tutorials and libraries. The 16 KB flash is adequate for most classroom projects, including Arduino-core ports, while the 1 KB SRAM suits small state machines and protocol stacks. DebugWIRE requires only the reset line, so low-cost development boards can expose full debugging without dedicating pins, an advantage over many competing 8-bit families in teaching environments.
Recommended
Networking and Communication Accessories
Small networking peripherals - serial-to-Ethernet converters, sensor gateways, and configuration front-ends - use the ATMEGA164PA-ANR's two USARTs to bridge device buses: one port talks to the target equipment (RS-232/485), the other to a module or service processor, while TWI manages a network EEPROM storing MAC addresses and configuration blocks. The 20 MHz core sustains buffered UART throughput well beyond 115200 baud with interrupt-driven FIFOs in the 1 KB SRAM, and hardware SPI can drive fast shift registers for status panels. The wide 1.8V-5.5V supply range allows direct interfacing with both 3.3V modules and legacy 5V line circuits using appropriate level considerations, consolidating what would otherwise need two voltage-domain MCUs.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA164PA-ANR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA164A-AU | ATMEGA324PA-AU | ATMEGA644PA-AU | ATMEGA1284P-AU |
|---|---|---|---|---|---|
| Package | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB | 16 KB | 32 KB | 64 KB | 128 KB |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Supply Voltage Range | 1.8 V to 5.5 V | 2.7 V to 5.5 V (standard-power variant) | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| picoPower Low-Power Technology | Yes | No | Yes | Yes | Yes |
| EEPROM | 512 B | 512 B | 1 KB | 2 KB | 4 KB |
Key Differentiators
- picoPower technology for battery designs (vs ATMEGA164A-AU)
- Lowest cost in same-footprint family (vs ATMEGA324PA-AU)
- Widest migration headroom on one PCB (vs ATMEGA1284P-AU)
Design Notes
Connect all VCC pins (as well as AVCC) to a clean supply and place a 0.1 uF ceramic capacitor at each supply pin, plus a bulk 10 uF capacitor per board rail. AVCC must be tied to VCC through a low-pass filter (for example 10 ohm resistor plus 0.1 uF) when ADC accuracy matters, since digital switching noise on AVCC directly degrades the 10-bit ADC's effective resolution. Never leave AVCC floating even if the ADC is unused - the datasheet requires it connected for correct port-A operation.
Fuse configuration is the most common failure mode when migrating across the ATmega164A/PA/324A/PA/644A/PA/1284/P family: clock-source, CKDIV8, and debugWIRE fuse defaults differ between variants, and enabling debugWIRE disables normal ISP access until it is disabled again through debug hardware. Also verify Brown-out Detection (BOD) fuses for battery designs - without BOD, EEPROM writes during supply collapse can corrupt calibration data stored in the 512 B EEPROM.
The 44-TQFP (10x10 mm) footprint needs no thermal pad, but use 0.5 mm-pitch layout rules per IPC-SM-782-style land-pattern guidance and place the crystal within 10 mm of XTAL1/XTAL2 with ground guard traces to reduce jitter and stray coupling. Route the two USART and SPI buses away from ADC input traces; if PA0-PA7 (the ADC port) run parallel to switching traces, insert a ground shield trace to protect the 10-bit conversion results from crosstalk artifacts.
Estimated: at 5V, 20 MHz, and full peripheral activity, the ATMEGA164PA draws only in the low tens of milliamperes class, giving roughly 100-150 mW dissipation - negligible for a 44-TQFP on standard FR4, so no heatsinking is required. Sleep-mode design matters far more than thermal design in this device: real system power is dominated by how long the picoPower core remains asleep with the real-time counter running.
Compliance Information
Mouser listing describes the part as 'GRN' (green/halogen-free). RoHS and lead-free status per standard Microchip ordering-code conventions; REACH and conflict-minerals statements not stated in the provided data.
