ATMEGA165P-16AU - 8-bit AVR MCU 16MHz 16KB Flash | Microchip
MPN: ATMEGA165P-16AU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.17 | $7.17 |
| 10 | $6.6 | $66.00 |
| 100 | $6.05 | $605.00 |
| 500 | $5.55 | $2,775.00 |
| 1,000 | $5.1 | $5,100.00 |
ATMEGA165P-16AU Overview
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, sitting within the broader hierarchy of MCU -> microcontroller unit -> embedded processor -> semiconductor. The AVR ATmega family is widely used for cost-sensitive embedded control where flash memory must be reprogrammed in-system, and it remains popular in industrial control, instrumentation, and hobby/education platforms due to mature toolchain support (MPLAB X, AVR-GCC, ICSP programming).
Key features of the ATMEGA165P-16AU include 133 powerful instructions with mostly single-cycle execution, 32 general purpose working registers, three flexible Timer/Counters, and a JTAG interface supporting boundary-scan, on-chip debugging, and programming. The picoPower-heritage design supports low-power idle and power-down modes, and the 16 MHz speed grade delivers roughly 16 MIPS of throughput. The wide 2.7 V to 5.5 V operating range lets one design span 3.3 V and 5 V systems.
Technically, the device pairs fast-flash Read-While-Write capability with 512 bytes of non-volatile EEPROM for parameter storage. The SPI, USART, and TWI-style peripherals (per the manufacturer datasheet) enable straightforward connectivity to sensors, displays, and serial links, while the 10-bit ADC on the PF port handles analog acquisition.
Typical applications include industrial control panels, LCD-based instruments, sensor hubs, battery-powered metering products, and in-circuit-programmable field devices.
Design consideration: at 16 MHz and 5 V, ensure decoupling of 100 nF per VCC pin and observe JTAG pin sharing constraints (PF port) when boundary-scan is enabled.
This page adds value beyond the manufacturer datasheet by synthesizing distributor pricing as of 2026-09-16, drop-in alternatives from the same ATmega family, and practical design notes in one place.
Drop-in alternatives for ATMEGA165P-16AU — 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-16AU (same form factor and footprint) — differing in Package, Flash Memory, ADC Resolution, Communication Interfaces, Debug Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA165P-16ANR
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →ATMEGA165A-AU
✅ Drop-In✓ In Stock
$3.47 / Unit
View Datasheet →ATMEGA165PV-8AU
✅ Drop-In✓ In Stock
$2.49 / Unit
View Datasheet →ATMEGA169A-AU
✅ Drop-In✓ In Stock
$2.98 / Unit
View Datasheet →ATMEGA169PA-AUR
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA165P-16AU Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Maximum Clock Frequency | 16 MHz |
| Flash Memory | 16 KB (8K x 16) In-System Programmable |
| EEPROM | 512 B |
| SRAM | 1 KB |
| Supply Voltage Range | 2.7 V to 5.5 V |
| General Purpose I/O | 53 lines |
| Working Registers | 32 general purpose registers |
| Instruction Set | 133 instructions, most single-cycle |
| Timer/Counters | 3 flexible Timer/Counters |
| Debug / Programming | JTAG (boundary-scan, on-chip debug, programming), ICSP |
| Package | 64-TQFP (14 x 14 mm) |
| Mounting Type | Surface Mount |
| Lifecycle Status | Active |
| Series | AVR ATmega |
ATMEGA165P-16AU 64-tqfp (14 x 14 mm) Pin Configuration Guide
Pin configuration for ATMEGA165P-16AU (64-tqfp (14 x 14 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 ATMEGA165P-16AU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA165P-16AU is suitable for 6 applications: Industrial Control Panels, LCD-Based Instrumentation, Sensor Hubs and Data Acquisition, Battery-Powered Metering Products, Field-Programmable Embedded Devices, Education and Prototyping Platforms.
Industrial Control Panels
The ATMEGA165P-16AU fits industrial control panel controllers because its 53 GPIO lines can directly drive relays, indicators, and keypads without port expanders, while the 16 MHz AVR core delivers roughly 16 MIPS for deterministic scan loops. In a typical design the MCU reads discrete inputs through optocouplers, executes ladder-style logic in firmware, and drives outputs via the three Timer/Counters for PWM or timing. The 2.7 V to 5.5 V tolerance tolerates noisy 5 V rails, and 512 bytes of EEPROM stores configuration and fault counters across power cycles. JTAG access enables boundary-scan testing of assembled boards, reducing production test fixture cost.
Recommended
LCD-Based Instrumentation
For meters and handheld instruments with character or graphic displays, the ATMEGA165P-16AU combines enough GPIO to drive parallel LCD interfaces with SPI/USART peripherals for external display controllers. The 16 KB Flash accommodates display font tables and measurement routines with headroom for OTA-style field firmware updates through in-system programming. The 10-bit analog inputs on the PF port digitize sensor signals, and the JTAG interface supports on-chip debugging during instrument calibration. Because the display refresh is timer-driven, the CPU can enter idle sleep between scans, cutting average current - valuable in battery-powered panel meters.
Recommended
Sensor Hubs and Data Acquisition
The ATMEGA165P-16AU serves as a compact sensor hub: its SPI and USART interfaces aggregate readings from ADCs, temperature, and pressure sensors, while 1 KB SRAM buffers sample blocks before forwarding over serial links. The 16 MHz clock supports polling rates in the tens-of-kilohertz class, and the three Timer/Counters generate precise sampling interrupts so acquisition timing is independent of main-loop jitter. EEPROM retention preserves calibration coefficients through power loss. The picoPower sleep modes let the hub duty-cycle between bursts, extending battery life in wireless-bridge or logging nodes where average current, not peak performance, dominates the design.
Recommended
Battery-Powered Metering Products
Utility submeters and portable gauges benefit from the ATMEGA165P-16AU's wide 2.7 V to 5.5 V operating range, allowing direct operation from three or four cells with a simple regulator strategy. Sleep and power-down modes drop average consumption to microamp class between measurement bursts, while 512 bytes of EEPROM accumulate billing counters that survive battery replacement. The 16 MHz grade gives fast wake-up processing when a measurement event fires, and the 53 I/O lines drive the display, buttons, and pulse outputs of a metering front-end. Low-voltage variants (PV grade) exist if the supply rail sags below 2.7 V.
Recommended
Field-Programmable Embedded Devices
Products that require firmware updates in the field exploit the ATMEGA165P-16AU's 16 KB ISP Flash with Read-While-Write capability: the boot-loader section can write application pages while executing, enabling serial or network firmware updates without removing the chip. The JTAG interface provides a second programming and debug path for factory fixtures and service tools. This dual-path updating model suits access-control terminals, motor controllers, and vending equipment where downtime must be minimized. Designers should reserve Flash for the bootloader and verify brown-out detection settings so a failed update cannot brick the device in an inaccessible installation.
Recommended
Education and Prototyping Platforms
The ATMEGA165P-16AU remains attractive for training boards and prototyping because the AVR architecture is documented exhaustively, the instruction set of 133 mostly single-cycle instructions is easy to teach, and free toolchains (AVR-GCC, MPLAB X) cover the device. The 64-TQFP exposes 53 I/O lines on 0.8 mm pitch, which students can access via breakout boards for labs covering timers, interrupts, serial communication, and JTAG debugging. Drop-in compatibility with ATMEGA165A-AU lets universities standardize one PCB while sourcing whichever variant is cheaper. The mature ecosystem shortens the path from first blink-LED project to complete embedded coursework.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA165P-16AU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA165P-16ANR | ATMEGA165A-AU | ATMEGA165PV-8AU | ATMEGA169A-AU | ATMEGA169PA-AUR |
|---|---|---|---|---|---|---|
| Package | 64-TQFP (14 x 14 mm) | 64-TQFP - same | 64-TQFP - same | 64-TQFP - same | 64-TQFP - same | 64-TQFP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 8 MHz | 16 MHz | 16 MHz |
| Flash Memory | 16 KB ISP | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| EEPROM | 512 B | 512 B | 512 B | 512 B | 512 B | 512 B |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 1.8 V-class (low-voltage grade) | 2.7 V to 5.5 V | 1.8 V-class picoPower |
| Special Features | picoPower heritage, JTAG | Same as this product | Non-picoPower standard variant | Low-voltage picoPower | LCD controller emphasis | picoPower + LCD controller |
Key Differentiators
- Full 16 MHz speed across 2.7-5.5 V (vs ATMEGA165PV-8AU)
- picoPower-heritage low-power modes (vs ATMEGA165A-AU)
- JTAG on-chip debug and boundary-scan (vs ATMEGA164PA-AUR)
Design Notes
Supply the ATMEGA165P-16AU at 5 V for full 16 MHz operation; if running from 3.3 V, verify that 16 MHz operation is within the safe operating frequency-versus-voltage envelope in the datasheet before committing, otherwise downgrade to a lower speed grade or the PV variant. Estimated: a typical 5 V AVR active-mode current is in the low tens of mA at 16 MHz, so budget regulator headroom accordingly and use brown-out detection to prevent flash corruption during supply dips.
Place 100 nF ceramic decoupling capacitors at every VCC/AVCC/AREF pin pair of the 64-TQFP, within 2-3 mm of the pins, with at least one bulk 4.7-10 uF capacitor near the device. Keep the analog ground return for AVCC/AREF separate from switching-noisy digital returns to preserve 10-bit ADC accuracy. Route JTAG (PF port pins) to a standard 2x5 header if boundary-scan production testing or in-circuit debugging is planned.
JTAG pins are shared with the PF port: enabling the JTAGEN fuse disables those pins as general I/O, a frequent cause of 'missing port' bugs on ATmega parts. Also note the RESET pin doubles as a weak I/O with strict fuse dependencies - leaving it floating or repurposing it complicates in-circuit programming. When using the bootloader for field updates, reserve Flash space and verify EEPROM write endurance budgeting (512 B, finite cycles) for frequently written counters.
Compliance Information
RoHS-compliant lead-free surface-mount TQFP per distributor listings (DigiKey/Mouser). REACH, halogen-free and conflict-minerals status not stated in the provided web data - verify on the Microchip product page.