ATMEGA165V-8AI - 8-bit AVR MCU 16KB Flash 8MHz TQFP-64 | Microchip
MPN: ATMEGA165V-8AI ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.85 | $38.50 |
| 100 | $3.45 | $345.00 |
| 500 | $3.1 | $1,550.00 |
| 1,000 | $2.85 | $2,850.00 |
ATMEGA165V-8AI Overview
An 8-bit AVR microcontroller is a single-chip processor built on the AVR enhanced RISC architecture, where most instructions execute in a single clock cycle. Within the power-management hierarchy of embedded systems, an MCU combines CPU, program memory, data memory, and peripherals such as timers, UART, SPI, and ADC on one die, making it the central control element of a product. The ATmega family sits within the broader AVR 8-bit line from Atmel, now Microchip Technology.
Key features of the ATMEGA165V-8AI include 130 powerful instructions mostly executed in a single cycle, eight 32-bit general purpose working registers, fully static operation, and in-system programmable Flash allowing firmware updates on the assembled PCB. The device integrates an 8-channel 10-bit ADC, SPI and UART/USART plus USI serial interfaces, and operates from supply voltages spanning 1.8V, 2.5V, 3.3V, and 5V rails, which is why the V suffix denotes the low-voltage 1.8V-capable variant.
Technically, the AVR RISC pipeline pairs a load-store architecture with a Harvard bus structure, separating program and data buses so instruction fetch and execution overlap. The 16KB (8K x 16) Flash is organized for in-system programming via SPI, while the 512-byte EEPROM retains calibration data through power cycles. Brown-out detection and an internal RC oscillator reduce external component count.
Typical applications include industrial control panels, battery-powered meters and sensors, and consumer appliance control boards where 8MHz performance at low voltage is sufficient.
Design consideration: as a 5V-tolerant and 1.8V-capable device, verify that the ADC reference and I/O voltage levels match your system rails, and confirm brown-out fuse settings for reliable low-voltage operation.
This page synthesizes distributor pricing, drop-in alternative options, pin-compatibility notes, and practical design guidance not consolidated in the manufacturer datasheet, as of 2026-09-16.
Drop-in alternatives for ATMEGA165V-8AI — 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-8AI (same form factor and footprint) — differing in Operating Temperature, Package, ADC Resolution, Connectivity, Instruction Set.
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 →ATMEGA165V-8AU
✅ Drop-In✓ In Stock
$3.12 / Unit
View Datasheet →ATMEGA169V-8AU
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA164PA-AUR
✅ Drop-In✓ In Stock
$2.05 / Unit
View Datasheet →ATMEGA325V-8AI
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA165V-8AI Maximum Ratings & Electrical Characteristics
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 8 MHz |
| Flash Program Memory | 16 KB (8K x 16) |
| SRAM | 1 KB |
| EEPROM | 512 bytes |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Supply Voltage Nominal | 1.8 V / 2.5 V / 3.3 V / 5 V |
| Instructions / MIPS | 130 instructions, up to 16 MIPS at 8 MHz |
| Connectivity | SPI, UART/USART, USI |
| ADC | 8-channel, 10-bit |
| Package | 64-TQFP (14x14 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (Industrial, I suffix) |
| Packaging | Tray |
| Series | AVR ATmega ATmega165 |
ATMEGA165V-8AI 64-tqfp (14x14 mm) Pin Configuration Guide
Pin configuration for ATMEGA165V-8AI (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-8AI.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA165V-8AI is suitable for 6 applications: Industrial Control Panels, Battery-Powered Meters and Sensors, Consumer Appliance Control Boards, Data Loggers with EEPROM Retention, LED and Display Drivers, SPI/UART Peripheral Nodes in Networking Equipment.
Industrial Control Panels
The ATMEGA165V-8AI fits industrial control panel controllers because its industrial -40C to +85C rating, 5V-tolerant I/O, and in-system programmable 16KB Flash allow field firmware updates without desoldering. The 8-channel 10-bit ADC digitizes potentiometers, current shunts, and sensor inputs directly, while SPI and UART/USART connect to operator displays and higher-level PLC links. Its fully static AVR core executes most of its 130 instructions in one cycle at 8MHz, delivering deterministic timing for relay sequencing and keypad scanning. In new panel designs, migrate to the ATMEGA165PA-AU, which shares the identical 64-TQFP footprint while providing an active lifecycle and lower power draw, eliminating obsolescence risk over the product service life.
Recommended
Battery-Powered Meters and Sensors
The ATMEGA165V-8AI suits battery-powered metering because the V-grade operates from 1.8V to 5.5V, allowing direct use of two alkaline cells without a boost converter, and the 10-bit 8-channel ADC reads shunt, thermistor, and potentiometer inputs with no external converter. The 512-byte EEPROM stores calibration coefficients through battery replacement, and the USI/SPI peripherals minimize firmware overhead for low-power serial links. Operating at 8MHz provides up to 16 MIPS for metering math while remaining fully static for clocked-down operation to save current. For new low-power designs the ATMEGA165PA-AU picoPower successor substantially reduces sleep-mode current in the same footprint, extending battery life further than the original V part.
Recommended
Consumer Appliance Control Boards
Appliance control boards use the ATMEGA165V-8AI as a cost-effective 8-bit supervisor for motors, heaters, and user interfaces. Its 64-pin TQFP provides enough GPIO for button matrices, seven-segment or LED indication, and AC-load drive via optocoupled triacs, while the internal oscillator option removes the crystal and its cost. The 16KB ISP Flash accommodates state-machine control plus communication firmware over UART for smart-appliance connectivity, and brown-out detection prevents corrupt EEPROM writes during mains dips. Since the part is now obsolete, replacement boards should adopt the pin-compatible ATMEGA165A-AU or ATMEGA165PA-AU, which keep the same layout and offer continued manufacturing support from Microchip Technology.
Recommended
Data Loggers with EEPROM Retention
The ATMEGA165V-8AI is a natural fit for compact data loggers: the internal 512-byte EEPROM preserves configuration and rolling log entries across power loss without external non-volatile memory, and the 10-bit ADC with internal reference samples up to eight analog channels for temperature, voltage, or current logging. The UART/USART streams records to a host or radio module, while the AVR core's single-cycle execution keeps sampling loops fast at only 8MHz, conserving power. In-system programmable Flash permits logging firmware updates in the field via SPI bootloaders. Engineers designing new loggers should specify the ATMEGA165PA-AU, which matches the 64-TQFP footprint and memory map while adding picoPower sleep modes for multi-year battery operation.
Recommended
LED and Display Drivers
Display-driven products such as thermostats, chargers, and small instrumentation leverage the ATMEGA165V-8AI's abundant port pins in the 64-TQFP to drive multiplexed LED segments and read keypads simultaneously. The 8MHz core refreshes 4-digit multiplexed displays without visible flicker while leaving CPU headroom for control logic, and the 10-bit ADC reads temperature sensors for closed-loop display indication. UART connectivity permits remote set-point updates. Where an LCD panel is preferred over LED, the closely related ATMEGA169V-8AU integrates a segment LCD controller in the same package class, per FindIC comparison data; otherwise migrate LED designs to the active ATMEGA165PA-AU successor with zero PCB change.
Recommended
SPI/UART Peripheral Nodes in Networking Equipment
As a distributed peripheral node, the ATMEGA165V-8AI handles front-panel, fan, and sensor supervision inside networking and telecom chassis. Its hardware SPI and UART/USART plus USI interfaces let the MCU report status over a backplane serial bus and drive PWM or GPIO outputs for fans and LEDs, while the 8-channel 10-bit ADC monitors voltages and temperatures for health reporting. The industrial temperature rating tolerates equipment-room extremes, and ISP Flash allows firmware refresh during maintenance windows. Although the V-8AI is obsolete, its pin-compatible ATMEGA165PA-AU successor allows spares and new builds on the same PCB, keeping deployed networking hardware serviceable without respin.
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Recommended Products Summary
Engineering reference data for ATMEGA165V-8AI — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA165PA-AU | ATMEGA165A-AU | ATMEGA169V-8AU | ATMEGA325V-8AI |
|---|---|---|---|---|---|
| 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 (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology (Atmel) |
| Flash Memory | 16 KB | 16 KB | 16 KB | 16 KB | 32 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 2 KB |
| Max Speed | 8 MHz | 20 MHz | 16 MHz | 8 MHz (V-grade) | 8 MHz |
| Min Supply Voltage | 1.8 V | 1.8 V | 1.8 V | 1.8 V | 1.8 V |
| LCD Controller | No | No | No | Yes | Yes |
Key Differentiators
- Only true same-footprint successors are same-brand (vs ATMEGA165PA-AU)
- Twice the Flash within the same family footprint (vs ATMEGA325V-8AI)
- Display capability trade-off (vs ATMEGA169V-8AU)
Design Notes
The ATMEGA165V-8AI is obsolete per Octopart data, so new designs must not specify it. The safe migration is the ATMEGA165PA-AU: identical 64-TQFP footprint, same 16KB/1KB/512B memory map, and compatible peripherals, allowing a bill-of-materials swap without PCB respin. Verify programming-fuse settings after migration since picoPower parts have extended sleep-mode options. For legacy boards, secure remaining broker stock (Heisener reported 2,080 pieces) and qualify the PA successor as a second source before the obsolete inventory is exhausted.
Operating the V-grade at its 1.8V minimum reduces dynamic current roughly with the square of supply voltage, so battery designs benefit from running at two-cell voltage rather than regulating up. However, the 8MHz speed grade is specified for the low-voltage range; do not overclock above 8MHz below 2.7V. Enable brown-out detection via fuse for EEPROM integrity during battery brownout, and use the power-down sleep mode between samples to cut average current for logging and metering products.
Place a 100nF ceramic decoupling capacitor at each VCC/AVCC pin pair of the 64-TQFP as close to the pins as possible, plus bulk 10uF near the supply entry. Tie AVCC to VCC through an LC or RC filter when using the 10-bit ADC so digital switching noise does not corrupt conversions, and route the analog reference away from UART/SPI traces. The 14x14 mm TQFP has 0.8mm pin pitch - design the land pattern per the datasheet drawing and inspect solder joints with magnification during prototyping.
Compliance Information
Compliance status not stated in retrieved distributor data for this obsolete part. The ATMEGA165PA-AU successor is the recommended RoHS-compliant path for new compliant designs; verify marking codes and Microchip product-change notices.