ATMEGA325V-8MUR - 8MHz AVR MCU, 32KB Flash, 64-QFN | Microchip
MPN: ATMEGA325V-8MUR ✓ 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 |
ATMEGA325V-8MUR Overview
An 8-bit AVR ATmega microcontroller is a Harvard-architecture RISC processor that executes most of its 131 instructions in a single clock cycle. Within the power-management hierarchy, it functions as the primary system controller in embedded designs, integrating program memory, data memory, timers, analog-to-digital conversion, and serial communication onto one die, eliminating external controller logic.
Key features include the advanced RISC AVR core with 32 general-purpose working registers, up to 54 general-purpose I/O lines (organized as six 8-bit ports), a 10-bit ADC, SPI, UART/USART, and USI serial interfaces, plus brown-out detection, power-on reset, and PWM peripherals. The 'V' grade supports the wide 1.8V to 5.5V operating range for battery-powered designs, while the industrial temperature range covers -40C to +85C.
The ATmega325 executes up to 8 MIPS at 8 MHz, using a two-stage pipeline that separates instruction fetch and execution. The self-programming FLASH enables in-system reprogramming, and the EEPROM retains calibration data through power cycles. Multiple sleep modes (Idle, ADC Noise Reduction, Power-save, Power-down, Standby) reduce quiescent current for energy-critical applications.
Typical applications include battery-powered instrumentation, industrial sensor nodes and controllers, consumer appliances, and low-voltage handheld devices, where the wide 1.8V supply range directly supports single-cell Li-ion or 2x AA battery architectures.
Design consideration: at 5V the maximum guaranteed clock is 8 MHz for this V-grade part; do not clock it at 16 MHz as the standard-grade ATmega325-16 allows. Verify Brown-out Detector threshold against the lowest expected supply voltage.
This page adds distributor sourcing data, drop-in alternatives within the ATmega325 family, pricing tiers, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATMEGA325V-8MUR — 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 ATMEGA325V-8MUR (same form factor and footprint) — differing in Package, RoHS Status, Number of I/O, Maximum Clock Frequency, Program Memory Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA325P-20MUR
✅ Drop-In✓ In Stock
$2.86 / Unit
View Datasheet →ATMEGA325PA-MUR
✅ Drop-In✓ In Stock
$1.65 / Unit
View Datasheet →ATMEGA325PV-10MU
✅ Drop-In✓ In Stock
$2.19 / Unit
View Datasheet →ATMEGA329A-MU
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA329PA-MUR
✅ Drop-In✓ In Stock
$3.85 / Unit
View Datasheet →ATMEGA325V-8MUR Maximum Ratings & Electrical Characteristics
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 8 MHz |
| Program Memory Size | 32 KB (16K x 16) FLASH |
| RAM Size | 2 KB |
| EEPROM Size | 1 KB |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Connectivity | SPI, UART/USART, USI |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Number of I/O | 54 |
| ADC Resolution | 10-bit |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 64-QFN / MLF (9x9 mm) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (T&R) |
| Program Memory Type | FLASH |
| RoHS Status | Compliant (GREEN) |
ATMEGA325V-8MUR 64-qfn / mlf (9x9 mm) Pin Configuration Guide
Pin configuration for ATMEGA325V-8MUR (64-qfn / mlf (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 ATMEGA325V-8MUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA325V-8MUR is suitable for 6 applications: Battery-Powered Sensor Nodes, Industrial Control and Automation, Handheld Instruments and Meters, Consumer Appliances, Low-Voltage Embedded Systems (1.8V Logic), Prototyping and Legacy AVR Designs.
Battery-Powered Sensor Nodes
The ATMEGA325V-8MUR's 1.8V to 5.5V supply range allows direct operation from 2x AA cells or a single Li-ion cell without a boost converter, while its five AVR sleep modes (Idle, ADC Noise Reduction, Power-save, Power-down, Standby) minimize average current between wake-ups. In a typical node, the MCU sleeps in Power-down, wakes on timer or pin interrupt, samples a sensor through the 10-bit ADC, and transmits over SPI or UART. The 32KB FLASH accommodates protocol stacks and OTA-style update code, and the 1KB EEPROM stores calibration coefficients. For designs needing ultra-low Power-down current, the pin-compatible picoPower ATMEGA325PV-10MU is a same-footprint upgrade.
Recommended
Industrial Control and Automation
The industrial temperature rating (-40C to +85C), brown-out detection, power-on reset, watchdog timer, and PWM peripherals make the ATMEGA325V-8MUR suited to factory controllers, motor and valve interface boards, and actuator drivers. Running at up to 8 MIPS, the AVR core services control loops with deterministic single-cycle execution of most instructions, while SPI and UART/USART link to HMI panels, drives, and field sensors. The 54 I/O lines directly switch relays, optocouplers, and status LEDs. At 5V, I/O drive levels meet legacy 24V-adjacent industrial signaling through simple level translation. The 64-QFN package withstands vibration better than leaded packages thanks to its soldered land-pattern attach.
Recommended
Handheld Instruments and Meters
Handheld multimeters, environmental meters, and portable test tools benefit from the ATMEGA325V-8MUR's wide 1.8V to 5.5V operation, which tracks a discharging battery pack without brown-out surprises, and from the ADC Noise Reduction sleep mode that cleans the analog supply during 10-bit ADC conversions. The 32KB FLASH holds linearization tables and menus, and the 1KB EEPROM retains last-used settings. GPIO counts of 54 drive keypad matrices and segment indicators, while UART communicates with PC software. Where an integrated LCD driver replaces external segment decoders, the same-package ATMEGA329A-MU drops in with the LCD controller added, eliminating a driver IC from the BOM.
Recommended
Consumer Appliances
White goods, small appliances, and climate-control panels use the ATMEGA325V-8MUR as the user-interface and sequence controller: the 8 MHz AVR core handles keypad debounce, buzzer and PWM loads, and temperature sensing via the 10-bit ADC, while brown-out reset and watchdog timer ensure safe restart after supply disturbances. The industrial temperature range covers enclosed appliance cabinets, and the low-voltage V-grade tolerates unregulated rectified supplies in cost-optimized designs. FLASH self-programming allows factory-line firmware flashing over UART without removing the device. The active lifecycle status guarantees continued sourcing for multi-year appliance production programs.
Recommended
Low-Voltage Embedded Systems (1.8V Logic)
Designs interfacing to modern 1.8V logic - low-voltage sensors, flash memory, and wireless modules - can attach the ATMEGA325V-8MUR directly at a 1.8V rail, avoiding level shifters that 3.3V-only MCUs would require. The guaranteed operating floor of 1.8V across the industrial temperature range (per Microchip datasheet speed curves) supports true single-rail systems. SPI and USI interfaces run at core-referenced levels, and the 2KB SRAM buffers communication payloads. Because the maximum clock remains 8 MHz even at 5V, the design maintains a single timing budget across the whole voltage range, simplifying worst-case timing analysis for mixed-voltage boards.
Recommended
Prototyping and Legacy AVR Designs
The ATmega325 family remains fully supported by Microchip's AVR toolchain - MPLAB X, AVR Studio derivatives, and standard ISP programming via SPI - making the ATMEGA325V-8MUR easy to integrate into both new prototypes and legacy designs originally built around the ATmega family. In-system self-programming permits firmware update in the field through a bootloader stored in the 32KB FLASH. Engineers migrating from the ATmega32 or ATmega324 will find the register-level AVR architecture identical, reducing porting effort. Availability in tape-and-reel supports both hand-placement prototypes and automated production pick-and-place on the same part number.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA325V-8MUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA325P-20MUR | ATMEGA325PA-MUR | ATMEGA325PV-10MU | ATMEGA329A-MU | ATMEGA329PA-MUR |
|---|---|---|---|---|---|---|
| Package | 64-QFN / MLF (9x9) | 64-QFN / MLF (9x9) - same | 64-QFN / MLF (9x9) - same | 64-QFN / MLF (9x9) - same | 64-QFN / MLF (9x9) - same | 64-QFN / MLF (9x9) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| FLASH | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| Supply 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 | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Integrated LCD Controller | No | No | No | No | Yes | Yes |
| Power Technology | Standard V-grade | picoPower | picoPower | picoPower | Standard | picoPower |
| Lifecycle Status | Active | Active | Active | Active | Active | Active |
Key Differentiators
- Wide 1.8V operating floor (vs ATMEGA325P-20MUR)
- No LCD controller overhead (vs ATMEGA329A-MU)
- Honest trade-off: lower speed grade (vs ATMEGA325P-20MUR)
Design Notes
Respect the V-grade speed-versus-voltage curve: the ATMEGA325V-8MUR is guaranteed to 8 MHz maximum across 1.8V to 5.5V. If your clock source is a crystal above 8 MHz, firmware and hardware timing violations will occur even at 5V. Decouple VCC and AVCC separately with 100 nF ceramics at each pin pair, and connect the exposed MLF ground pad to a solid ground plane - this pad is the primary ground return for the die and must not be left floating for mechanical and electrical reliability.
The 9x9 mm 64-QFN/MLF uses a 0.5 mm ball pitch with an exposed center pad. Design the land pattern per the Microchip datasheet recommended footprint with via-in-pad (4 to 6 vias) under the center pad to sink heat and guarantee grounding. For assembly, specify a stencil aperture of 50-70% on the center pad to avoid excessive solder that floats the device and bridges the fine-pitch perimeter pins. Inspect with X-ray after reflow; no-lead packages hide solder voids from visual inspection.
Fuse-bit configuration is the most common bring-up failure: wrong CKSEL/SUT bits leave the device unresponsive, and setting SPIEN incorrectly on a board without high-voltage parallel programmer can lock out ISP recovery. Always enable the Brown-out Detector and set its threshold above the minimum rail voltage of your regulator under all load conditions. Also note RESET on AVR is active-low and internally pulled up - if you use RESET as GPIO instead, re-enabling ISP programming afterwards requires a full chip erase.
Compliance Information
Listed as GREEN / RoHS-compliant, lead-free in distributor and datasheet listings (ADatasheet: 'IND TEMP, GREEN, 1.8V'). REACH, conflict-minerals and AEC-Q100 status not stated in provided data.
