ATMEGA165V-8AU - 8-Bit AVR MCU 16KB Flash 8MHz | Microchip
MPN: ATMEGA165V-8AU ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.2 | $5.20 |
| 10 | $4.68 | $46.80 |
| 100 | $4.16 | $416.00 |
| 500 | $3.64 | $1,820.00 |
| 1,000 | $3.12 | $3,120.00 |
ATMEGA165V-8AU Overview
A microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and programmable peripherals into one chip, forming the lowest tier of the embedded processing hierarchy (MCU -> embedded processor -> system-on-chip). The AVR family from Atmel, now Microchip, uses a modified Harvard RISC architecture in which most instructions execute in a single clock cycle, delivering high code efficiency for 8-bit control tasks.
Key features of the ATMEGA165V-8AU include the AVR RISC core rated at 8MHz (up to 8 MIPS at 8MHz), on-chip Flash programmable through the SPI serial interface or a conventional programmer, and connectivity peripherals including SPI and UART/USART for serial communication. The part integrates a brown-out detector, watchdog timer, and internal RC oscillator, reducing external component count. The 64-pin TQFP exposes 54 general-purpose I/O lines organized in ports PA through PG, giving ample pin resources for button matrices, displays, and parallel peripheral buses.
Technically, the ATmega165 pairs its 16KB self-programmable Flash with 512B of EEPROM for non-volatile parameter storage and 1KB of internal SRAM for runtime data. The V-grade voltage rating supports operation from a nominal 2.7V to 5.5V supply at 8MHz, making it usable on 3.3V and 5V systems. JTAG boundary-scan and on-chip debugging are supported through the JTAG interface, simplifying development on the 64-pin package.
Typical applications include industrial control panels, consumer appliance controllers, battery-powered instrumentation on the low-voltage V grade, and legacy design maintenance where AVR toolchains are already established.
A key design consideration: verify your supply rail against the V-speed grade; the 8MHz limit applies across the V operating range, and over-clocking beyond 8MHz on the V variant is not guaranteed by the datasheet.
This page synthesizes distributor availability, drop-in same-family alternatives, pinout guidance, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for ATMEGA165V-8AU — 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 ATMEGA165V-8AU (same form factor and footprint) — differing in Operating Temperature, Instruction Set, Package, Connectivity, Core Processor.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA165PA-AU
✅ Drop-In✓ In Stock
$2.05 / 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 →ATMEGA165V-8AI
✅ Drop-In✓ In Stock
$2.85 / Unit
View Datasheet →ATMEGA169V-8AU
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA165V-8AU Maximum Ratings & Electrical Characteristics
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 8 MHz |
| Flash Memory | 16 KB (8K x 16) |
| SRAM | 1 KB |
| EEPROM | 512 bytes |
| Connectivity | SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, WDT |
| Operating Voltage | 2.7 V to 5.5 V |
| Package | 64-TQFP (14x14 mm) |
| Mounting Type | Surface Mount |
| In-System Programmable Flash | 16 KB via SPI |
| Number of I/O | 54 |
| Oscillator Type | Internal |
ATMEGA165V-8AU 64-tqfp (14x14 mm) Pin Configuration Guide
Pin configuration for ATMEGA165V-8AU (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 ATMEGA165V-8AU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA165V-8AU is suitable for 6 applications: Industrial Control Panels, Battery-Powered Instrumentation, Legacy Design Maintenance, Consumer Appliance Controllers, Embedded Serial Communication Nodes, Educational and Prototyping Platforms.
Industrial Control Panels
The ATMEGA165V-8AU fits industrial control panels where 54 GPIO lines across ports PA-PG drive button matrices, relay banks, and LED indicators from one 8-bit controller. Its 16KB In-System Programmable Flash allows field firmware updates over the SPI interface without removing the board, while the 512B EEPROM stores configuration parameters such as setpoints that survive power cycles. The watchdog timer recovers a hung controller unattended, and brown-out detection prevents corrupted EEPROM writes during supply dips on factory floors. Operating at 8MHz on a 5V industrial rail, the AVR RISC core executes most instructions in a single cycle, providing deterministic scan times. The brown-out detector, WDT, and internal RC oscillator combination reduces the external component count on cost-sensitive panel boards.
Recommended
Battery-Powered Instrumentation
The V-grade 2.7V to 5.5V operating range of the ATMEGA165V-8AU permits direct operation from three AA cells or a single lithium cell with a simple regulator, eliminating a boost converter in portable instruments. The internal RC oscillator trims BOM cost and board area in handheld meters and data loggers, while sleep modes supported by the AVR architecture extend battery life between charges or cell replacements. The 1KB SRAM buffers sample data and the 512B EEPROM holds calibration constants written in the field. For new battery-powered designs, the pin-compatible picoPower ATMEGA165PV-8AU or ATMEGA165PA-AU substantially lowers sleep current, so engineers maintaining this platform should qualify the PA/PV parts during their next redesign cycle to gain power savings without PCB changes.
Recommended
Legacy Design Maintenance
Many installed AVR designs built on the ATmega165 generation still require sustaining supply. The ATMEGA165V-8AU, and its drop-in replacements, allow OEMs to keep legacy PCBs in production without layout or firmware re-qualification: the ATMEGA165PA-AU and ATMEGA165A-AU share the exact 64-TQFP footprint, pin functions, and 16KB Flash / 1KB SRAM / 512B EEPROM memory map. Because the part is ISP-programmable through SPI, service technicians can reflash firmware on installed units using standard AVR ISP tools. FindIC's cross-reference also validates the ATMEGA169V-8AU as a terminal-consistent replacement requiring no circuit modification. XAIPART stocks multiple same-footprint family members so legacy programs can dual-source and mitigate obsolescence risk on aging bill of materials.
Recommended
Consumer Appliance Controllers
White-goods and small-appliance controllers benefit from the ATMEGA165V-8AU's combination of ample I/O, on-chip EEPROM, and low-cost 8-bit processing. The 54 GPIO lines directly scan touch or mechanical keypads and drive seven-segment or multiplexed LCD-style segment displays through software multiplexing, while the UART/USART links to higher-level controllers or service ports and the SPI bus attaches external memory or peripheral expanders. The watchdog timer ensures a locked-up controller recovers into a safe state, important for appliances with heaters or motors, and brown-out detection guarantees orderly startup after momentary mains dips. The 8MHz AVR core delivers sufficient throughput for control loops and display refresh while keeping code compact within the 16KB Flash budget.
Recommended
Embedded Serial Communication Nodes
With integrated SPI and UART/USART peripherals, the ATMEGA165V-8AU serves as a serial protocol bridge or fieldbus node in distributed control systems. A typical node uses the USART to link a RS-485 transceiver for multidrop communication while the SPI bus interfaces ADCs, EEPROM, or digital potentiometers, all serviced from the single 8MHz AVR core. In-System Programmability lets integrators update node firmware over the same SPI wiring harness during commissioning, avoiding socketed parts. The 2.7V to 5.5V V-grade supply range allows the node to share either a 3.3V logic rail or a 5V industrial rail without level conversion on the board. Deterministic single-cycle instruction execution simplifies timing analysis for polled protocol implementations.
Recommended
Educational and Prototyping Platforms
The AVR ATmega family remains a staple of embedded-systems education, and the ATMEGA165V-8AU's 64-pin TQFP exposes all buses and peripherals for teaching I/O design, SPI and UART protocols, ISP programming, and JTAG debugging on a single chip. The 16KB Flash accommodates complete course projects, the 512B EEPROM demonstrates non-volatile storage concepts, and the watchdog and brown-out peripherals illustrate robust-system design. Hobbyist and university boards frequently use through-hole DIP AVR variants like the ATMEGA162-16PU for breadboards, then transition to the 64-TQFP part for the final surface-mount board. Free AVR toolchains (AVR-GCC, avrdude) and inexpensive ISP programmers keep the total learning cost low, making the family practical for labs.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA165V-8AU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA165PA-AU | ATMEGA165A-AU | ATMEGA165PV-8AU | ATMEGA165V-8AI | ATMEGA169V-8AU |
|---|---|---|---|---|---|---|
| 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 | 64-TQFP (14x14 mm) - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core Speed | 8 MHz | 16 MHz (PA grade) | 16 MHz (A grade) | 8 MHz | 8 MHz | 8 MHz |
| Flash Memory | 16 KB (8K x 16) | 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 |
| Power Technology | Standard (V grade) | picoPower | Standard | picoPower | Standard | Standard |
| Operating Voltage | 2.7 V to 5.5 V | 1.8 V to 5.5 V | 2.0 V to 5.5 V | 1.8 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Distinctive Peripheral | SPI, UART/USART, WDT, BOD | Same + lower power | Same set | Same + lower power | Same set, temp grade | Adds LCD controller |
Key Differentiators
- 54 GPIO lines in a single 64-TQFP (vs ATMEGA164PA-AUR (44-TQFP))
- Lower system cost via internal RC oscillator (vs ATMEGA169V-8AU)
- 5V-tolerant ecosystem compatibility with upgrade path (vs ATMEGA165PA-AU)
Design Notes
Respect the V speed grade limit: the ATMEGA165V-8AU is specified to 8MHz across its 2.7V to 5.5V operating range. Do not substitute a 16MHz crystal expecting standard-grade performance; clocking above the V-grade rating violates the datasheet and risks unstable execution, especially at the low end of the supply range. If your design needs 16MHz, migrate to the pin-compatible ATMEGA165PA-AU or ATMEGA165A-AU, which support the higher frequency on the same 64-TQFP footprint.
The 64-pin TQFP has a 0.5mm pin pitch, which requires careful solder-paste stencil design and reflow profiling; hand rework is possible with drag soldering but inspect for bridging between VCC/GND pairs under magnification. Decouple each VCC pin with 100nF ceramics placed within 2-3mm of the pin, and add bulk 10uF near the supply entry. Keep the reset line short with a 10k pull-up; enable the brown-out detector via fuse so the MCU holds reset during slow power ramps.
Estimated: an ATmega165 running at 8MHz from 5V typically draws in the low-milliamp range; for battery designs the dominant lever is sleep-mode current, not active current. Because this V-grade die is the older, non-picoPower implementation, its power-down current is substantially higher than the pin-compatible ATMEGA165PV-8AU/PA-AU. For new low-power designs, qualify the picoPower parts on the same footprint; verify exact current figures against the datasheet electrical characteristics table for your voltage and clock configuration.
Fuse settings are the most common field failure cause on AVR designs: programming RSTDISBL or setting an invalid clock-source fuse on a 64-TQFP part can require high-voltage parallel programming to recover, which is impractical for a surface-mounted chip. Lock the SPIEN fuse in the programmed state for ISP access, verify CKOPT/CKSEL selections against your crystal, and document the complete fuse map in your production test plan before releasing the board.
Compliance Information
Compliance status was not stated in the retrieved distributor snippets; verify against the Microchip product page for this ordering code before export or automotive use.