ATMEGA165P-16MU - 16MHz AVR MCU 16KB Flash 64-QFN | Microchip
MPN: ATMEGA165P-16MU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.48 | $1,240.00 |
| 1,000 | $2.19 | $2,190.00 |
ATMEGA165P-16MU Overview
An 8-bit AVR microcontroller is a single-chip processor built on the AVR enhanced RISC architecture, in which most of its 133 powerful instructions execute in a single clock cycle. Within the semiconductor hierarchy, it belongs to the microcontroller class (CPU plus Flash, EEPROM, SRAM, timers, and peripherals on one die) under the broader category of embedded processors and integrated circuits. The AVR family is widely used because it approaches 1 MIPS per MHz throughput, letting designers trade processing speed directly against power consumption.
Key features of the ATMEGA165P-16MU include 53 general-purpose I/O lines, 32 general-purpose working registers, a JTAG interface supporting Boundary-scan, on-chip debugging, and in-system programming, and three flexible Timer/Counters with compare modes and PWM. The supply voltage range of 2.7V to 5.5V allows operation from both 3.3V and 5V rails, and the 'P' suffix denotes picoPower-class low-power operation with multiple sleep modes for battery-powered designs.
Technically, the device combines an 8-bit AVR core with 16KB (8K x 16) self-programmable Flash featuring Read-While-Write capability, an on-chip ADC, SPI and USART serial interfaces, and an internal RC oscillator option. The JTAG port enables full boundary-scan testing of the assembled PCB as well as debugger attachment via tools such as AVR JTAGICE.
Typical applications include industrial control panels, consumer appliances, HVAC and motor control boards, and embedded systems that need a compact 64-pad surface-mount MCU with rich I/O. The 9x9 mm QFN footprint suits dense, space-constrained boards.
When designing, pay attention to the fine-pitch QFN land pattern: use the exposed die pad as ground with an array of thermal vias, and keep decoupling capacitors within 2 mm of supply pins. Verify programming-pin allocation (SPI or JTAG) before finalizing the layout.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single verified reference for ATMEGA165P-16MU selection and sourcing.
Drop-in alternatives for ATMEGA165P-16MU — 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 ATMEGA165P-16MU (same form factor and footprint) — differing in Instructions, Package, Operating Temperature, Supply Voltage Range, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA165A-MUR
✅ Drop-In✓ In Stock
$1.19 / Unit
View Datasheet →ATMEGA165P-16MNR
✅ Drop-In✓ In Stock
$1.75 / Unit
View Datasheet →ATMEGA165PV-8MNR
✅ Drop-In✓ In Stock
$3.49 / Unit
View Datasheet →ATMEGA169P-16MU
✅ Drop-In✓ In Stock
$2.64 / Unit
View Datasheet →ATMEGA169A-MUR
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA165P-16MU Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR 8-bit RISC |
| Data Bus Width | 8 Bit |
| Maximum Clock Frequency | 16 MHz |
| Program Memory Size | 16 KB (8K x 16) Flash |
| Program Memory Type | In-System Programmable Flash |
| EEPROM Size | 512 B |
| SRAM Size | 1 KB |
| Supply Voltage Range | 2.7 V to 5.5 V |
| I/O Count | 53 |
| Instructions | 133 (mostly single-cycle) |
| Timers/Counters | 3 flexible Timer/Counters |
| Debug/Programming Interface | JTAG (Boundary-scan, on-chip debug, programming) |
| Serial Interfaces | SPI, USART, TWI (I2C-compatible) |
| ADC | On-chip ADC |
| Package | 64-QFN (MLF), 9 x 9 mm, 1 mm height |
| Operating Temperature | -40C to +85C (Industrial) |
| Mounting Type | Surface Mount |
| Lifecycle Status | Active |
ATMEGA165P-16MU 64-qfn (mlf), 9 x 9 mm, 1 mm height Pin Configuration Guide
Pin configuration for ATMEGA165P-16MU (64-qfn (mlf), 9 x 9 mm, 1 mm height 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-16MU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA165P-16MU is suitable for 6 applications: Industrial Control Panels, Consumer Appliance Control, Motor Control and PWM Drive, Embedded Data Loggers, Building Automation and HVAC, Test and Measurement Fixtures.
Industrial Control Panels
The ATMEGA165P-16MU fits industrial control and automation boards because its 53 GPIO lines let a single MCU drive relays, read limit switches, and manage HMI buttons without port expanders. The 2.7V to 5.5V supply range tolerates noisy industrial rails, and the JTAG boundary-scan interface supports in-circuit test of densely populated 64-QFN assemblies, reducing field failures. Three Timer/Counters with PWM outputs handle heater or small motor control at 16MHz resolution. Placed on a two-layer or four-layer PCB with the QFN exposed pad soldered to ground, the part delivers 1 MIPS per MHz throughput for deterministic scan loops and Modbus-style polling over USART or SPI, all within an industrial temperature envelope.
Recommended
Consumer Appliance Control
Washing machines, rice cookers, and HVAC thermostats benefit from the ATMEGA165P-16MU's combination of low picoPower sleep modes and 16KB self-programmable Flash, which is sufficient for control state machines, EEPROM-backed user settings (512B EEPROM), and fault logging. The on-chip ADC digitizes NTC temperature sensors and user potentiometers directly, eliminating external converter ICs. Its 9x9 mm QFN footprint fits compact appliance PCBs behind front panels, while 53 I/O accommodate segment driving through port expansion or direct matrix scan of keys and LEDs. Operating from a simple 5V linear supply, the AVR core executes the control loop at up to 16MHz, and the watchdog plus brown-out features keep appliances safe through mains disturbances.
Recommended
Motor Control and PWM Drive
For small DC and stepper motor control, the ATMEGA165P-16MU provides three flexible Timer/Counters with compare and PWM modes, enabling independent control of speed and direction channels at up to 16MHz timer clocks. The 16KB Flash stores field-updatable commutation tables, and the SPI/USART interfaces link to gate-driver or CAN-bridge ICs. The 8-bit core's single-cycle instructions give predictable interrupt latency for encoder-capture loops, while the 1KB SRAM buffers trajectory profiles. Because the AVR drives MOSFET gate-driver inputs directly from its 5V-tolerant outputs, designers avoid level-shifting circuitry, and the JTAG port allows real-time register inspection during inverter bring-up, shortening commissioning time on dense QFN-based driver boards.
Recommended
Embedded Data Loggers
The ATMEGA165P-16MU suits battery-powered data loggers thanks to its picoPower 'P' silicon sleep modes, 512B EEPROM for calibration constants, and on-chip ADC for sensor sampling. In a typical logger, the MCU sleeps in power-down at microamp-class current (per ATmega165P datasheet power profiles), wakes on Timer or USART interrupt to sample an analog channel, appends readings to external SPI Flash or SD media, and returns to sleep. The 16MHz capability allows burst processing of filtering and compression between samples, while the 2.7V floor pairs well with three-cell battery stacks through a low-dropout regulator. JTAG-based field debugging lets service technicians extract fault traces without disturbing the production firmware image.
Recommended
Building Automation and HVAC
HVAC zone controllers and building automation nodes use the ATMEGA165P-16MU to scan temperature and humidity sensors over TWI (I2C), compute setpoint PID loops, and drive damper or valve actuators through its PWM timers. The 53 I/O lines address multiple zone boards from one MCU, reducing BOM count, while the industrial temperature grade tolerates rooftop and plant-room environments. The USART connects the node to RS-485 gateways, and the in-system programmable Flash allows firmware updates with Read-While-Write execution so controller downtime during upgrades is minimized. Its 9x9 mm QFN package fits standard DIN-rail control PCBs, and boundary-scan support simplifies production ICT when hundreds of nodes are manufactured per batch.
Recommended
Test and Measurement Fixtures
Bench fixtures and ATE accessories exploit the ATMEGA165P-16MU's JTAG boundary-scan and deterministic AVR core to sequence relays, generate stimulus patterns, and measure pass/fail timing. The 16KB in-system programmable Flash holds reconfigurable test scripts, letting one fixture serve multiple product revisions via firmware download over SPI or JTAG. Timer/Counter input-capture measures pulse widths from sensors under test with sub-microsecond resolution at 16MHz, and the ADC verifies analog thresholds without an external digitizer. The 64-QFN package keeps the controller section small enough to mount directly on the fixture PCB, and the 5.5V maximum supply allows direct interfacing with industry-standard 5V logic levels common in test equipment racks.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA165P-16MU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA165A-MUR | ATMEGA165P-16MNR | ATMEGA165PV-8MNR | ATMEGA169P-16MU | ATMEGA169A-MUR |
|---|---|---|---|---|---|---|
| Package | 64-QFN (MLF) 9x9 mm | 64-QFN (MLF) 9x9 mm - same | 64-QFN (MLF) 9x9 mm - same | 64-QFN (MLF) 9x9 mm - same | 64-QFN (MLF) 9x9 mm - same | 64-QFN (MLF) 9x9 mm - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| SRAM / EEPROM | 1 KB / 512 B | 1 KB / 512 B | 1 KB / 512 B | 1 KB / 512 B | 1 KB / 512 B | 1 KB / 512 B |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 8 MHz | 16 MHz | 16 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V | 1.8 V to 5.5 V | 2.7 V to 5.5 V | 1.8 V to 5.5 V | 2.7 V to 5.5 V | 1.8 V to 5.5 V |
| LCD Controller | No | No | No | No | Yes (segment LCD) | Yes (segment LCD) |
| Silicon Revision / Power Class | P (picoPower) rev | A (newer die, lower power) | P (identical die) | PV (low-voltage picoPower) | P (picoPower) | A (newer die) |
Key Differentiators
- 16MHz speed grade with 2.7-5.5V industrial supply (vs ATMEGA165PV-8MNR)
- Maximum general-purpose I/O (no LCD pad loss) (vs ATMEGA169P-16MU)
- Proven P-revision silicon for legacy firmware (vs ATMEGA165A-MUR)
Design Notes
The 64-QFN (MLF) 9x9 mm package uses a 0.5 mm pad pitch with a large exposed die pad. Solder the die pad to the ground plane through a 3x3 or 4x4 via array (0.3 mm vias) to provide both electrical ground return and heat spreading. Inspect with X-ray or use a reduced-void stencil aperture pattern (80% coverage) because voids under the QFN pad are the leading cause of field returns for this package. Verify the land pattern against Microchip application guidance for QFN packages rather than copying old TQFP footprints.
Decouple VCC, AVCC, and AREF independently: place 100 nF ceramic capacitors within 2 mm of each supply pin, plus 4.7-10 uF bulk capacitance per rail. AVCC should be filtered (ferrite bead plus 100 nF) when ADC accuracy matters, since the on-chip ADC references AVCC. Tie unused I/O either as outputs low or inputs with internal pull-ups to prevent floating-pin oscillation, which increases current draw measurably in picoPower sleep modes and can defeat the low-power design intent.
Three fuse-related traps recur on the ATmega165P: (1) the JTAG interface owns four port C pins by default - unprogram the JTAGEN fuse if those GPIOs are needed, but then boundary-scan testing is no longer available; (2) disabling the JTD bit requires a timed write sequence, a common firmware bug source; (3) when using SPI programming, keep the SPI pins free of heavy pull-downs. Also confirm the frequency-versus-voltage derating curve in the ATmega165P datasheet before running 16MHz below 4.5V.
Estimated: at 5V, 16MHz, and 53 I/O driving moderate loads, worst-case dynamic power is on the order of 50-100 mW (CMOS activity factor dependent); with the QFN die pad well soldered, junction temperature rise is a few degrees C above ambient and no heatsinking is required. Thermal design only becomes a concern if many pins continuously source the 20 mA absolute-maximum per-pin current, which is not a normal operating condition for this MCU.
Compliance Information
RoHS/REACH status not stated in the provided web data; FindIC listing describes the part as Green packaging, but this must be confirmed against the official Microchip product page before compliance claims are made.
