ATMEGA165PA-AN - 8-Bit AVR MCU 16MHz 16KB Flash TQFP-64 | Microchip
MPN: ATMEGA165PA-AN ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.46 | $1,230.00 |
| 1,000 | $2.19 | $2,190.00 |
ATMEGA165PA-AN Overview
A microcontroller integrates a processor core, program memory, data memory, and peripherals on a single chip, forming the lowest tier of the embedded system hierarchy: MCU -> embedded processor -> system-on-chip. The ATmega family from Atmel (now Microchip Technology) is one of the most widely deployed 8-bit AVR RISC MCU lines in industrial control, consumer, and hobbyist electronics, supported by the AVR GCC toolchain and Microchip Studio (formerly Atmel Studio).
Key features include the picoPower technology for ultra-low power consumption (power-down mode draws only a few microamperes), an on-chip 8-channel 10-bit ADC, JTAG boundary-scan and on-chip debug, and read-while-write flash for self-programming. The AVR core executes most instructions in a single clock cycle, achieving up to 16 MIPS throughput at 16 MHz, and its 32 general-purpose working registers are directly connected to the ALU for efficient C-compiler code density.
Peripheral set includes one USART, SPI serial interface, two-wire serial interface (TWI/I2C-compatible), a 16-bit timer/counter with PWM, and two 8-bit timer/counters. Operating voltage spans 1.8 V to 5.5 V, allowing single-cell battery or 5 V industrial logic operation, with -40C to +85C industrial temperature range for the -A grade.
Typical applications include industrial sensor nodes, LCD-controlled consumer appliances (the ATmega169 sibling shares an integrated LCD controller heritage), motor control panels, battery-powered instrumentation, and general embedded control where flash in-system programmability simplifies field updates.
When designing with this device, note that the 1 KB SRAM is the practical limit for complex middleware stacks; heavier networking or graphics workloads should migrate to the ATmega325 or ATmega645 family within the same TQFP-64 footprint.
This page consolidates distributor pricing data, cross-reference information, and practical design notes not found in the manufacturer datasheet, verified as of 2026-09-16.
Drop-in alternatives for ATMEGA165PA-AN — 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-AN (same form factor and footprint) — differing in Operating Temperature, Package, ADC, Communication Interfaces, Debug / Scan.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA165P-16ANR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.18 / Unit
View Datasheet →ATMEGA165A-AU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$3.47 / Unit
View Datasheet →ATMEGA169PA-AUR
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA169A-AU
✅ Drop-In✓ In Stock
$2.98 / Unit
View Datasheet →ATMEGA165PA-AN Maximum Ratings & Electrical Characteristics
| Core | 8-bit AVR RISC |
| Maximum Clock Frequency | 16 MHz |
| Performance | 16 MIPS at 16 MHz (1 MIPS/MHz) |
| Flash Memory | 16 KB (8K x 16) ISP flash, read-while-write |
| EEPROM | 512 B |
| SRAM | 1 KB |
| General Purpose I/O | 54 lines |
| Working Registers | 32 x 8-bit |
| Operating Voltage | 1.8 V to 5.5 V |
| ADC | 8-channel, 10-bit |
| Timers | 2 x 8-bit, 1 x 16-bit |
| Communication Interfaces | USART, SPI, TWI (I2C-compatible) |
| Debug / Scan | JTAG (on-chip debug and boundary scan) |
| Low Power Technology | picoPower |
| Package | 64-TQFP, 14x14 mm |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C |
| RoHS Status | Compliant |
ATMEGA165PA-AN 64-tqfp, 14x14 mm Pin Configuration Guide
Pin configuration for ATMEGA165PA-AN (64-tqfp, 14x14 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-AN.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA165PA-AN is suitable for 6 applications: Industrial Sensor Nodes, Battery-Powered Instrumentation, Motor Control Panels, Consumer Appliance Control, Embedded Communication Nodes, Hobbyist and Educational Systems.
Industrial Sensor Nodes
The ATMEGA165PA-AN suits industrial sensing nodes because its 8-channel 10-bit ADC digitizes multiple analog sensors directly, and its picoPower core keeps average consumption low in duty-cycled deployments. With 16 KB ISP flash and 1 KB SRAM it runs typical sensor-fusion and filtering firmware comfortably, while the USART, SPI, and TWI interfaces connect to RS-485 transceivers, external EEPROM, or digital sensors. Operating from 1.8 V to 5.5 V permits direct 5 V or 3 V rail integration, and the -40C to +85C grade covers cabinet-mounted electronics.
Recommended
Battery-Powered Instrumentation
In portable and battery-powered instruments, the picoPower technology of the ATMEGA165PA-AN minimizes sleep-mode drain, and the 1.8 V minimum supply enables operation from a single cell. The asynchronous timer supports RTC wake-ups from power-down mode, so the MCU spends most of its life in microamp-level sleep and wakes at 16 MHz only for measurement bursts via the 10-bit ADC. With 54 GPIO lines it can drive keypads, indicators, and external peripheral enables without port expanders, keeping the bill of materials small and quiescent current low.
Recommended
Motor Control Panels
The 16-bit timer/counter with PWM outputs of the ATMEGA165PA-AN generates motor drive waveforms, while two 8-bit timers handle scheduling and tachometer capture. The 16 MHz AVR core executes control loops deterministically at up to 16 MIPS, sufficient for basic PID speed regulation on brushed DC and small stepper motors. Its wide 1.8 V to 5.5 V input range simplifies interface to 5 V gate drivers and logic-level MOSFET drivers, and JTAG on-chip debugging shortens control-loop bring-up. GPIO abundance allows direct control of relays, indicators, and limit-switch inputs on the same 64-TQFP device.
Recommended
Consumer Appliance Control
Appliance control boards benefit from the ATMEGA165PA-AN's combination of generous GPIO (54 lines), USART and TWI for communication with front panels and power modules, and read-while-write flash that permits field firmware updates over a serial bootloader. The 512 B EEPROM retains calibration data and user settings across power cycles for 100,000 write cycles. Green RoHS packaging suits high-volume consumer manufacturing, and the low-cost single-chip integration of ADC, timers, and serial interfaces replaces several discrete components, reducing BOM cost and board area in the 14x14 mm TQFP.
Recommended
Embedded Communication Nodes
With one USART plus SPI and TWI buses, the ATMEGA165PA-AN bridges serial field devices to higher-level networks: the USART connects to RS-232/RS-485 transceivers while SPI or TWI attaches RF modules or Ethernet peripheral ICs. The 16 KB flash accommodates lightweight protocol stacks, and 1 KB SRAM handles packet buffers for simple modbus-style messaging. Operation at 5 V gives direct noise-robust interfacing to industrial transceivers, and the picoPower idle modes cut consumption between polling cycles, which matters for battery-backed or energy-conscious installations.
Recommended
Hobbyist and Educational Systems
The ATmega165 platform inherits the AVR ecosystem familiar from Arduino-class parts: free AVR GCC toolchain, Microchip Studio IDE, and inexpensive ISP programmers, making the ATMEGA165PA-AN approachable for education and prototyping. JTAG debugging teaches professional workflows, and the 10-bit ADC plus timers support lab exercises in measurement and control. The 64-TQFP package requires only a two-layer board with standard 0.8 mm pitch pads, and firmware written for other ATmega parts ports easily thanks to the shared AVR RISC instruction set and 32 working registers.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA165PA-AN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA165P-16ANR | ATMEGA165A-AU | ATMEGA169PA-AUR | ATMEGA169A-AU |
|---|---|---|---|---|---|
| Package | 64-TQFP (14x14 mm) | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB ISP | 16 KB ISP | 16 KB ISP | 16 KB ISP | 16 KB ISP |
| SRAM / EEPROM | 1 KB / 512 B | 1 KB / 512 B | 1 KB / 512 B | 1 KB / 512 B | 1 KB / 512 B |
| Maximum Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Integrated LCD Controller | No | No | No | Yes | Yes |
| Low Power Technology | picoPower | picoPower | A-generation low power (improved) | picoPower | A-generation low power (improved) |
Key Differentiators
- Maximum general-purpose I/O in the mega165 footprint (vs ATMEGA169PA-AUR)
- picoPower ultra-low sleep consumption (vs ATMEGA165A-AU)
- Read-while-write ISP flash for field updates (vs ATMEGA165P-16ANR)
Design Notes
Decouple VCC with a 100 nF ceramic capacitor placed within a few millimeters of each VCC/GND pin pair, plus 10 uF bulk capacitance near the MCU. The picoPower core is tolerant of supply ripple, but ADC accuracy degrades with noisy AVCC: use an LC filter or dedicated ferrite feed for the analog supply pin and keep a quiet analog ground island under the ADC input traces for best 10-bit conversion performance.
The 64-TQFP with 0.8 mm lead pitch routes cleanly on a two-layer board; run power as a flood plane and keep the JTAG header footprint on the layout even if unpopulated in production, since on-chip debugging dramatically shortens firmware bring-up. Reserve ISP (SPI) header access for field programming - the read-while-write flash supports bootloader-based updates without a physical programmer. Follow Microchip's AVR hardware design application notes for crystal layout: keep the 16 MHz crystal loop tight with local ground guard.
Three frequent mistakes: (1) substituting an ATMEGA169PA for the mega165 without checking the LCD-controller pin conflict - up to 8 GPIO functions disappear; (2) ignoring EEPROM write endurance of 100,000 cycles by logging data continuously - wear-level or buffer writes; (3) exceeding flash erase endurance of 10,000 cycles in self-programming applications. Also confirm the exact orderable suffix: -AN denotes the 64-TQFP industrial tray package; -ANR is the tape-and-reel equivalent used for automated assembly lines.
Compliance Information
RoHS-compliant green (GRN) packaging per distributor listings. REACH, halogen-free, and conflict-minerals declarations not present in the provided data and must be confirmed via Microchip's compliance portal.
