ATMEGA165P-16MN - 8-Bit AVR MCU 16KB 16MHz 64-QFN | Microchip
MPN: ATMEGA165P-16MN β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.19 | $2.19 |
| 10 | $1.98 | $19.80 |
| 100 | $1.76 | $176.00 |
| 500 | $1.58 | $790.00 |
| 1,000 | $1.42 | $1,420.00 |
ATMEGA165P-16MN Overview
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, positioning it within the broader hierarchy of microcontroller units (MCUs) under the semiconductor and embedded processing category. AVR MCUs from Microchip are widely used where cost-effective, deterministic 8-bit control is required, sitting alongside PIC and ARM Cortex-M families in the embedded systems ecosystem.
Key features of the ATMEGA165P-16MN include 16KB (8K x 16) In-System Programmable Flash with read-while-write capability, 512B EEPROM, 1KB SRAM, and 32 general-purpose working registers. The advanced RISC architecture implements 131 powerful instructions, most executing in a single clock cycle, delivering up to 16 MIPS at 16MHz. The P-suffix denotes an enhanced process variant of the original ATmega165 with improved reliability and a wider industrial temperature range.
Technical depth: the device integrates JTAG (IEEE 1149.1-compliant) boundary-scan and on-chip debugging, a programmable Watchdog Timer with separate on-chip oscillator, and multiple sleep modes including picoPower-class low-power modes that reduce consumption to microamp levels in power-down. Peripherals typically include an 8-channel 10-bit ADC, USART, SPI, and two 8-bit plus one 16-bit timer/counters with PWM outputs, enabling motor control, sensing, and communication tasks without external components.
Typical applications include industrial automation and control panels, consumer appliances, battery-powered portable instruments, and building/HVAC control nodes, where the combination of 5V tolerance, self-programmable Flash, and rich peripheral set fits cost-sensitive embedded designs.
A key design consideration is that the 64-QFN exposed-pad package requires a well-designed ground via array under the pad for thermal and electrical performance; designers migrating from TQFP footprints must verify land-pattern compatibility.
This page synthesizes distributor pricing, drop-in alternatives within the AVR family, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATMEGA165P-16MN β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA165PA-16MN
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA165A-16MN
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA325-16MN
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA645-16MN
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA169P-16MU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA165P-16MN Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR 8-bit RISC |
| Core Size | 8-bit |
| Max Clock Frequency | 16 MHz |
| Throughput | 16 MIPS at 16 MHz |
| Flash Memory | 16 KB (8K x 16) ISP |
| EEPROM | 512 B |
| SRAM | 1 KB |
| Instructions | 131 (mostly single-cycle) |
| General Purpose I/O | 53 lines |
| Working Registers | 32 |
| JTAG | Yes (IEEE 1149.1 boundary scan + on-chip debug) |
| Operating Temperature | Industrial grade |
| Package | 64-QFN (9x9 mm) with exposed pad (HVQCCN) |
| Mounting Type | Surface Mount |
| Number of Terminals | 64 |
| Watchdog Timer | Yes, with separate on-chip oscillator |
ATMEGA165P-16MN 64-qfn (9x9 mm) with exposed pad (hvqccn) Pin Configuration Guide
Pin configuration for ATMEGA165P-16MN (64-qfn (9x9 mm) with exposed pad (hvqccn) 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 ATMEGA165P-16MN.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA165P-16MN is suitable for 6 applications: Industrial Automation and Control Panels, Battery-Powered Portable Instruments, Consumer Appliances and White Goods, Building Automation and HVAC Control Nodes, Sensor Hubs and Data Acquisition Systems, Motor Control and Embedded Actuation.
Industrial Automation and Control Panels
The ATMEGA165P-16MN fits industrial control panels because its 16MHz/16MIPS AVR core provides deterministic single-cycle instruction execution for real-time I/O scanning, while 53 GPIO lines drive relays, indicators, and keypads without port expanders. The 16KB self-programmable Flash supports field firmware updates over RS-485 or CAN gateways via a USART bootloader, and the 512B EEPROM stores calibration and configuration data across power cycles. Its industrial temperature grade and watchdog timer with separate on-chip oscillator provide the fault recovery behavior expected in unattended factory equipment. Placed as the main controller with SPI-connected ADCs and a JTAG header for on-site debugging, the device replaces discrete logic while keeping BOM cost low; its single-cycle arithmetic keeps control loop jitter in the microsecond range at 16MHz.
Recommended
Battery-Powered Portable Instruments
Portable instruments benefit from the ATMEGA165P-16MN's fully static AVR core and multiple sleep modes: between measurements the CPU can enter power-down while the asynchronous watchdog keeps supervising, drawing only microamp-level current. The 16MHz grade allows burst processing of sensor data when sampling, then rapid return to sleep, maximizing battery life in handheld meters and data loggers. The on-chip ADC inputs digitize sensor channels without an external converter, the EEPROM retains user calibration even when batteries are swapped, and the 64-QFN 9x9 mm footprint keeps the PCB compact. The P-suffix silicon's improved reliability matters in devices subject to thousands of charge cycles, and JTAG debugging shortens development of the power-mode sequencing code that dominates battery-life performance in such designs.
Recommended
Consumer Appliances and White Goods
In appliances such as washing machines, coffee makers, and climate controllers, the ATMEGA165P-16MN provides the cost/performance balance these high-volume products demand. The 16KB Flash holds full application plus bootloader for manufacturing-line programming, 53 GPIO lines drive 7-segment displays, buttons, and triac/motor-control outputs, and timer PWM channels generate motor speed control. The watchdog timer guarantees recovery from firmware lockups caused by mains transients, and the industrial temperature grading tolerates hot enclosure environments near motors. The 64-QFN package keeps controller-board area small for crowded appliance PCBs. Its single-cycle RISC core executing 131 instructions makes exact-time AC mains zero-crossing detection straightforward, which is essential for phase-angle motor and heater control in white goods.
Recommended
Building Automation and HVAC Control Nodes
HVAC zone controllers and building automation nodes use the ATMEGA165P-16MN as a field-bus-connected control point: a USART runs Modbus RTU while SPI links sensor front ends, and the 16MHz clock comfortably services 9600-115200 baud communication alongside PID control loops. The 512B EEPROM stores network addresses and setpoints through power outages, and 53 GPIO lines interface dampers, valves, and fans through driver stages. Sleep-mode operation keeps stand-by power low for energy-efficiency regulations, and self-programmable Flash enables remote firmware upgrades during maintenance windows via the same Modbus link. The JTAG interface (IEEE 1149.1) supports production boundary-scan testing of assembled HVAC boards, reducing manufacturing defects before deployment in hard-to-service ceiling and wall locations.
Recommended
Sensor Hubs and Data Acquisition Systems
As a sensor hub, the ATMEGA165P-16MN aggregates analog and digital sensor channels: the on-chip 10-bit ADC inputs read temperature, pressure, and level sensors while SPI/I2C-compatible peripherals poll digital sensors, and the 1KB SRAM buffers readings for burst transmission. At 16MHz the core can oversample and average ADC readings to raise effective resolution, and the EEPROM trims sensor offsets per-unit during production calibration. Timestamped logging into 512B EEPROM captures fault events for diagnostics. The 64-QFN package with exposed pad provides a solid low-impedance ground reference that improves ADC noise performance when paired with careful analog layout. JTAG on-chip debug lets engineers single-step acquisition firmware, and the watchdog ensures the logger self-recovers in remote, unattended monitoring installations.
Recommended
Motor Control and Embedded Actuation
The ATMEGA165P-16MN serves small motor-control tasks such as DC fan, pump, and stepper actuation: its timer PWM outputs generate speed-control waveforms, GPIO drives H-bridge direction signals, and the fast 16MHz single-cycle core executes current-limit protection loops with microsecond latency. The 53 GPIO lines manage limit switches, encoders, and status signaling, while the watchdog timer enforces safe shutdown if firmware hangs during a stall or over-current event. The EEPROM stores motor-specific calibration curves, and self-programmable Flash allows actuation profiles to be tuned in the field. The 64-QFN package dissipates controller heat through its exposed pad into the ground plane, keeping junction temperatures safe even inside sealed actuator housings with restricted airflow.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA165P-16MN β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA165PA-16MN | ATMEGA165A-16MN | ATMEGA325-16MN | ATMEGA645-16MN | ATMEGA169P-16MU |
|---|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) EP | 64-QFN (9x9 mm) EP - same | 64-QFN (9x9 mm) EP - same | 64-QFN (9x9 mm) EP - same | 64-QFN (9x9 mm) EP - same | 64-QFN (9x9 mm) EP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB ISP | 16 KB | 16 KB | 32 KB | 64 KB | 16 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 2 KB | 4 KB | 1 KB |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| GPIO Lines | 53 | 53 | 53 | 53 | 53 | 53 |
| Special Feature | Enhanced P-suffix reliability | picoPower low-current modes | picoPower low-current modes | Doubled flash | 4x flash for large applications | Integrated LCD controller |
| JTAG / Debug | Yes (IEEE 1149.1) | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Field-updatable system with self-programmable Flash (vs ATMEGA169P-16MU)
- Lower operating power option exists in same footprint (vs ATMEGA165PA-16MN)
- Scalable flash without PCB respin (vs ATMEGA325-16MN)
Design Notes
The 64-QFN exposed pad is the primary ground connection for the ATMEGA165P-16MN and must be soldered to a dedicated ground island connected to the PCB ground plane through a 5x5 or denser array of vias (0.3 mm drill, filled if possible). Simply tying ground through perimeter pins alone will cause elevated ground bounce and unreliable JTAG operation at 16MHz. Follow the land pattern in the Microchip datasheet and IPC-7351 recommendations, and verify pin-1 orientation visually during assembly since X-ray inspection is needed to confirm solder joint quality under no-lead packages.
Decouple each VCC pin pair with a 100 nF ceramic capacitor placed within 2 mm of the pin, plus one bulk 4.7-10 uF capacitor near the device. AVR cores draw transient current spikes on every clock edge; insufficient decoupling shows up as ADC noise and sporadic watchdog resets. Estimated: at 16MHz with 53 GPIO moderately loaded, core current is typically in the 10-15 mA range per family data, so IR drop is small, but the switching dI/dt demands low-ESL local decoupling. Use a solid ground plane under the QFN and route the reset line short with a 10 kOhm pull-up for reliable in-system programming.
The four JTAG pins are multiplexed with general-purpose port pins; if firmware disables JTAG via the JTD fuse bit or software, on-chip debugging and boundary scan become unavailable and the pin functions change - plan the I/O budget accordingly. Also note that migrating firmware from ATmega165 (non-P) or to the PA/A variants requires checking errata differences, and that the -MN (QFN) and -AU (TQFP) suffixes are NOT footprint interchangeable. When substituting ATmega325/645 family members on the same footprint, re-verify peripheral register addresses against the target device datasheet before flashing production firmware.
Compliance Information
Compliance status was not explicitly stated in the provided web data; verify RoHS/REACH status on the official Microchip product page before ordering.
