ATMEGA165V-8MU - 8MHz AVR MCU, 16KB Flash | Microchip
MPN: ATMEGA165V-8MU ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.85 | $6.85 |
| 10 | $6.25 | $62.50 |
| 100 | $5.6 | $560.00 |
| 500 | $5.1 | $2,550.00 |
| 1,000 | $4.65 | $4,650.00 |
ATMEGA165V-8MU Overview
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most of its 131 powerful instructions in a single clock cycle. In the embedded system hierarchy, the AVR ATmega family sits under microcontrollers -> embedded processors -> semiconductors, integrating flash program memory, SRAM, EEPROM, analog-to-digital conversion, and serial connectivity on a single die. The V suffix denotes a 1.8V to 5.5V operating voltage range for low-voltage, low-power designs.
Key features include fully static operation delivering up to 8 MIPS throughput at 8MHz, SPI and UART/USART plus USI serial interfaces, an 8-channel 10-bit ADC for analog sensing, and In-System Programmable (ISP) flash allowing firmware updates on the assembled board. The 64-QFN 9x9 mm package provides a compact footprint with excellent thermal performance for space-constrained designs.
Architecturally, the device uses the AVR advanced RISC core with 32 general-purpose working registers directly connected to the ALU, enabling single-cycle execution and high code density. Two-cycle hardware multiplier support, nested interrupt vectors, and a full-duplex USART round out the peripheral set.
Typical applications include industrial control and automation nodes, battery-powered instrumentation using the wide 1.8V to 5.5V supply range, and sensor interfaces leveraging the 10-bit ADC.
Design consideration: verify availability early, as Octopart distributor data lists this exact suffix as obsolete; plan migration to the pin-compatible ATmega325/645 family or the newer ATmega165P variants.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet, as of 2026-09-16.
Drop-in alternatives for ATMEGA165V-8MU — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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Request AlternativesATMEGA165V-8MU 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 |
| Connectivity | SPI, UART/USART, USI |
| ADC Resolution | 10-bit |
| ADC Channels | 8 |
| Instructions | 131 powerful instructions, most single-cycle |
| Max Throughput | Up to 16 MIPS (fully static, at 16 MHz) |
| Operating Voltage Range | 1.8 V to 5.5 V (V version) |
| Package | 64-QFN (9x9 mm) |
| Mounting Type | Surface Mount |
| Packaging | Tray |
| Programmability | In-System Programmable (ISP) Flash |
| Product Status | Obsolete |
ATMEGA165V-8MU 64-qfn (9x9 mm) Pin Configuration Guide
Pin configuration for ATMEGA165V-8MU (64-qfn (9x9 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-8MU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA165V-8MU is suitable for 6 applications: Industrial Control and Automation, Battery-Powered Portable Instruments, Sensor Interface Front Ends, Embedded Communication Nodes, Consumer Appliance Control Boards, Legacy Board Service and Repair.
Industrial Control and Automation
The ATMEGA165V-8MU fits industrial control nodes where a compact, wide-voltage microcontroller drives relays, reads sensors, and communicates over SPI or UART to supervisory systems. Its 8-channel 10-bit ADC digitizes analog process signals such as 4-20mA-derived voltages directly, while the 16KB flash holds deterministic control loops and the 1KB SRAM supports modest state machines. Placed on a 24V-backed board via a local 5V or 3.3V regulator, the device's 1.8V to 5.5V supply tolerance simplifies power sequencing. The in-system programmable flash allows firmware updates during scheduled maintenance without desoldering. Because throughput of up to 8 MIPS at 8MHz covers typical PID and polling workloads, no external logic is needed, reducing BOM cost in panel and motor-control subassemblies.
Recommended
Battery-Powered Portable Instruments
The V suffix of the ATMEGA165V-8MU denotes a 1.8V to 5.5V operating range, which allows direct powering from two alkaline cells or a single lithium cell through a small regulator, making it well suited to handheld meters and dataloggers. Idle and power-down sleep modes extend battery life in duty-cycled acquisition systems, while the internal oscillator option removes an external crystal in timing-tolerant designs. The 8-channel 10-bit ADC samples sensor arrays such as thermistors and bridge transducers, and 512 bytes of EEPROM stores calibration constants across power cycles. Engineers should derate clock speed at the lowest voltages per the AVR frequency-voltage curve. For new battery products, the PicoPower ATMEGA165PV-8MU offers the same footprint with significantly lower sleep current.
Recommended
Sensor Interface Front Ends
With an 8-channel 10-bit ADC, SPI and USI serial links, and 512 bytes of EEPROM for per-unit calibration, the ATMEGA165V-8MU serves as a complete sensor acquisition front end. Analog inputs from temperature, pressure, or humidity elements connect directly to port A, with the internal bandgap reference providing a stable conversion reference without external components. The USI supports shift-register-style communication to displays or upper-level controllers, and the full-duplex USART bridges to RS-485 transceivers in multi-drop networks. The 64-QFN 9x9 mm footprint places the converter physically close to the sensing elements, shortening analog traces and reducing noise pickup. Firmware should average multiple ADC samples to exploit the converter's effective resolution in noisy industrial environments.
Recommended
Embedded Communication Nodes
The ATMEGA165V-8MU provides SPI, UART/USART, and USI connectivity, allowing a single chip to bridge a microcontroller application to RS-232/RS-485 links, SPI peripherals such as flash or RTCs, and shift-register IO expanders. Its 16KB flash accommodates protocol stacks for Modbus RTU-style polling or simple proprietary framing, while the 1KB SRAM buffers frames without external memory. The hardware USART with baud-rate generator delivers reliable full-duplex serial links up to the UART's maximum supported rate at 8MHz. Designers should verify that their required baud rates fall within tolerance at the chosen clock, and use the USI where a second serial port is needed. The wide 1.8V to 5.5V range eases integration into mixed 3.3V and 5V networks.
Recommended
Consumer Appliance Control Boards
Appliance panels benefit from the ATMEGA165V-8MU's combination of ADC input for temperature and user-interface sensing, EEPROM for stored settings, and sufficient flash for menu-driven control logic. The 64-QFN package keeps the controller footprint small on cost-driven single-sided layouts, and the 8MHz fully static operation supports both crystal-driven timing for AC-line synchronization and internal-oscillator runs for cost reduction. In-system programmability permits last-stage firmware customization on the assembly line, a common requirement for appliance variants. Because the part is obsolete, high-volume appliance manufacturers should qualify the pin-compatible ATmega325/645 family in the same QFN footprint before the next board revision to secure long-term supply without PCB respin.
Recommended
Legacy Board Service and Repair
For maintaining legacy equipment, the ATMEGA165V-8MU remains a repair-critical component where the original firmware binary must be reprogrammed onto an identical die. Stocking policies should balance the 3-distributor availability reported by Octopart against field-failure rates, and buyers should confirm the firmware image is archived with fuse-bit settings documented before any chip replacement. When open-market stock is exhausted, the ATMEGA165PV-8MU offers the same pinout, package, and code compatibility with lower power draw, allowing a service swap with only a clock and fuse configuration review. Technicians should verify the exact package suffix (MU, 64-QFN 9x9 mm) when sourcing, since TQFP-suffixed variants do not fit the same land pattern.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA165V-8MU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA165PV-8MU | ATMEGA325V-8MU | ATMEGA645V-8MU |
|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB | 16 KB | 32 KB | 64 KB |
| SRAM | 1 KB | 1 KB | 2 KB | 4 KB |
| Max Clock Speed | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Operating Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Power Features | Standard AVR sleep modes | PicoPower (lower sleep current) | Standard AVR sleep modes | Standard AVR sleep modes |
Key Differentiators
- Lowest-memory, lowest-cost member of the pin-compatible mega165/325/645 64-QFN family (vs ATMEGA325V-8MU)
- Wide low-voltage supply range (V suffix) (vs ATMEGA165PV-8MU)
- USI plus full USART gives three serial interfaces on one chip (vs ATMEGA325V-8MU)
Design Notes
The V-suffix ATmega165 operates from 1.8V to 5.5V, but the maximum safe clock frequency decreases as supply voltage drops per the AVR frequency-versus-voltage curve. Operating at 8MHz requires roughly 2.7V or higher per typical AVR derating; below that, use the internal 1MHz/2MHz oscillator options or slow the crystal. Add 100nF ceramic decoupling at each VCC/AVCC pin pair of the 64-QFN plus a 10uF bulk capacitor, and tie AVCC to VCC through an LC filter when using the ADC for clean conversions.
The 64-QFN (9x9 mm) MLF package has its ground pad under the die - this exposed pad is the primary ground and thermal path and must be soldered to a grounded array of vias on the PCB. Do not leave it floating, or ground returns for the ADC and USB-adjacent peripherals will be compromised. Fan out the 0.5mm-pitch perimeter pads with vias-in-pad or dog-bone escape routing on at least a 4-layer board for the densest signal mixes.
This exact suffix is listed as Obsolete in Octopart data with only 3 distributors stocking it. Before designing in or re-ordering, lock the fuse settings and firmware image, and pre-qualify ATMEGA165PV-8MU or the pin-compatible ATmega325V-8MU on the same 64-QFN footprint. Do not confuse the MU (QFN) suffix with AU (TQFP) parts - they are not footprint-compatible despite identical electrical function.
Compliance Information
Compliance status not stated in the provided verified web data. Consult the Microchip product page for official RoHS/REACH declarations.
