ATMEGA165PA-MU - 8-bit AVR MCU 16MHz 16KB Flash 64-QFN | Microchip
MPN: ATMEGA165PA-MU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.62 | $3.62 |
| 10 | $3.26 | $32.60 |
| 100 | $2.79 | $279.00 |
| 500 | $2.41 | $1,205.00 |
| 1,000 | $2.08 | $2,080.00 |
ATMEGA165PA-MU Overview
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, positioned within the power-management hierarchy of embedded systems as the central control IC that reads sensors, drives actuators, and manages communication in a standalone electronic product.
Key features include the Advanced RISC Architecture with 133 powerful instructions and 32 general-purpose working registers, In-System Programmable Flash with read-while-write capability, and a JTAG interface for boundary-scan, on-chip debugging, and In-Circuit Serial Programming (ICSP). The picoPower technology delivers very low power consumption in active, idle, and power-down modes, making it well suited to battery-operated equipment.
Technical depth comes from the AVR core: single-cycle execution at up to 16MHz yields roughly 16 MIPS throughput, while the three flexible timers, USART, and SPI serial interface allow deterministic real-time control with minimal external components. Supply voltage spans 2.7V to 5.5V, covering both 3.3V and 5V logic systems with a single device.
Typical applications include industrial control panels, LCD-based instrumentation front ends, battery-powered meters, and consumer appliance control boards where a mid-range AVR with ample I/O and JTAG debug is required.
A key design consideration is package thermal handling: the 64-QFN exposed-pad style requires a solid ground pour for reliable soldering and heat dissipation, and the MSL rating must be respected during reflow.
This page synthesizes distributor pricing tiers, drop-in alternatives, comparison tables, and practical design notes not found in the manufacturer datasheet, providing added sourcing and engineering value.
Drop-in alternatives for ATMEGA165PA-MU — 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 ATMEGA165PA-MU (same form factor and footprint) — differing in Flash Memory, Package, Working Registers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA165PA-AUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.54 / Unit
View Datasheet →ATMEGA165PA-MNR
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →ATMEGA325PA-MU
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA645PA-MU
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA169PA-MU
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →ATMEGA165PA-MU Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR 8-bit RISC |
| Core Size | 8-bit |
| Max Clock Frequency | 16 MHz |
| Flash Memory | 16 KB (8K x 16) |
| EEPROM | 512 B |
| SRAM | 1 KB |
| I/O Count | 53 I/O |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Instruction Set | 133 instructions, most single-cycle |
| Working Registers | 32 general purpose |
| Timers | 3 flexible timers |
| Debug / Programming | JTAG (boundary-scan, on-chip debug, ICSP) |
| Low Power Technology | picoPower |
| Package | 64-QFN (9x9 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (industrial) |
| Lifecycle Stage | Active |
ATMEGA165PA-MU 64-qfn (9x9 mm) Pin Configuration Guide
Pin configuration for ATMEGA165PA-MU (64-qfn (9x9 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 ATMEGA165PA-MU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA165PA-MU is suitable for 6 applications: Industrial Control Panels, Battery-Powered Meters and Instruments, Appliance Control Boards, Data Acquisition Front Ends, Embedded Communication Nodes, Educational and Prototyping Systems.
Industrial Control Panels
The ATMEGA165PA-MU's 53 GPIO lines and three flexible timers make it a strong fit for industrial control panels that drive relays, read switches, and sequence actuators. Its 16MHz single-cycle AVR core delivers roughly 16 MIPS of deterministic 8-bit throughput, sufficient for scanned keypads and status LEDs without an RTOS. The industrial -40C to +85C temperature rating and 2.7V to 5.5V tolerance suit noisy 24V-cabinet environments with a simple 5V regulator. JTAG on-chip debugging lets field engineers update logic via ICSP without desoldering, and the 16KB ISP Flash with read-while-write supports parameter logging into EEPROM.
Recommended
Battery-Powered Meters and Instruments
picoPower technology is the defining reason to select the ATMEGA165PA-MU in battery-operated meters: active, idle, and power-down modes are all optimized for microamp-class sleep current, allowing multi-year operation from a lithium cell in duty-cycled designs. The 2.7V to 5.5V range permits direct 3V coin-cell domains, and the 10-bit analog front end plus timers handle measurement scheduling. With 53 GPIOs and 1KB SRAM, a single device can scan the display, acquire sensor data, and manage a serial link. Wake-on-interrupt from power-down via pin change or watchdog keeps average current dominated by sleep-state consumption.
Recommended
Appliance Control Boards
Consumer appliance controllers benefit from the ATmega165PA's balance of I/O count, Flash size, and cost. 16KB of In-System Programmable Flash is ample for state-machine wash/dry cycles, and the 512B EEPROM retains user settings across power cycles without external NVM. The USART provides a service-diagnostics UART, while SPI interfaces to external ADCs or display drivers. The 64-QFN (9x9 mm) package keeps board area compact for control PCBs behind front panels, and Green/RoHS compliance supports consumer regulatory requirements. Field firmware updates are performed through ICSP using two I/O pins and reset.
Recommended
Data Acquisition Front Ends
For compact DAQ nodes, the ATMEGA165PA-MU combines an integrated ADC, SPI port, and generous GPIO in one 64-QFN device, reducing BOM count versus discrete solutions. Timers generate precise conversion triggers, and the read-while-write Flash allows logging calibration constants without halting execution. The 1KB SRAM buffers sample windows before burst transmission over USART to a host. Because the AVR executes from single-cycle flash, interrupt latency is deterministic - important for time-stamped sampling. Use the picoPower idle mode between conversions so the ADC clock keeps running while the core sleeps, cutting average board power measurably.
Recommended
Embedded Communication Nodes
The USART and SPI interfaces of the ATMEGA165PA-MU make it practical as a protocol translator or RS-485/UART field node inside industrial networks. The 16MHz clock supports standard baud rates with low error, and 53 GPIO handles addressing, enable lines, and status signaling for transceivers. In-system programmable Flash allows network firmware updates, and JTAG boundary-scan supports production board test - a rare feature at this price point that reduces ICT fixture complexity. The 2.7V to 5.5V supply tolerance eases integration into mixed 3.3V/5V backplanes common in retrofit installations.
Recommended
Educational and Prototyping Systems
The megaAVR family remains a teaching staple, and the ATMEGA165PA-MU exposes nearly the whole AVR feature set - JTAG debugging, EEPROM, timers, ADC, USART, SPI - on one accessible 8-bit core. Students learn single-cycle RISC execution with 133 instructions and 32 registers, then debug on real hardware using the MPLAB SNAP per Microchip's documented 8-pin SIL ICSP connection. The 2.7V to 5.5V supply makes breadboard-friendly 5V or 3.3V operation possible, and 16KB Flash accommodates substantial course projects. When code outgrows the device, pin-compatible ATMEGA325PA/645PA parts in the same footprint require no PCB changes.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA165PA-MU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA165PA-AUR | ATMEGA165PA-MNR | ATMEGA325PA-MU | ATMEGA645PA-MU | ATMEGA169PA-MU |
|---|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 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 | 64 KB | 16 KB |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| LCD Driver | No | No | No | No | No | Yes - integrated segment LCD |
| JTAG Debug / ICSP | Yes | Yes | Yes | Yes | Yes | Yes |
| Low Power Technology | picoPower | picoPower | picoPower | picoPower | picoPower | picoPower |
Key Differentiators
- Maximum GPIO density in the megaAVR 64-pin family (vs ATMEGA169PA-MU)
- Same-footprint Flash upgrade path to 64KB (vs ATMEGA325PA-MU)
- picoPower efficiency at equal price class (vs ATMEGA16-16AU)
Design Notes
The 64-QFN (9x9 mm) package requires a well-designed land pattern with a central ground via array for the exposed die pad. Follow IPC-recommended QFN footprint guidelines: 0.5mm pad pitch, slightly extended heel fillets for inspectable solder joints, and at least a 3x3 grid of vias under the pad tied to the ground plane. Because this is a tray-packed part, verify MSL handling before reflow - bake per J-STD-033 if the floor-life is exceeded.
Decouple VCC/AVCC with 100nF ceramic capacitors placed within 5mm of each supply pin, plus 4.7uF to 10uF bulk at the regulator. AVCC should be filtered (ferrite bead plus capacitor) when the ADC is used, since digital switching noise directly degrades conversion accuracy. Keep the supply within 2.7V to 5.5V and respect the maximum-frequency-versus-voltage derating curve at the low end of the range - running 16MHz at 2.7V is outside the guaranteed safe operating region.
Do not leave reset floating - use a 10k pull-up and consider an external supervisor for noisy industrial environments. If JTAG is unused, disable it via fuse to free the four port pins (a frequent cause of 'missing GPIO' bugs on megaAVR parts). When using ICSP with the MPLAB SNAP, remember the programming pins are shared with application functions; add series resistors so attached peripherals do not load the programming lines.
When driving long external buses or cables from Port pins, add series termination (22 to 100 ohm) to limit ringing and EMI at 16MHz edges. Keep the crystal within 10mm of XTAL1/XTAL2 with guard ground, and route USART/SPI traces away from the ADC input traces to prevent crosstalk-induced conversion noise.
Compliance Information
Distributor listings (FindIC) describe the ATMEGA165PA-MU as a Green, industrial-temperature device. Full REACH/halogen declarations should be confirmed on the Microchip product page.
