ATMEGA3250V-8AUR - 8-bit AVR MCU 32KB 8MHz TQFP-100 | Microchip
MPN: ATMEGA3250V-8AUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.2 | $5.20 |
| 10 | $4.68 | $46.80 |
| 100 | $4.16 | $416.00 |
| 500 | $3.72 | $1,860.00 |
| 1,000 | $3.38 | $3,380.00 |
ATMEGA3250V-8AUR Overview
An 8-bit microcontroller is a single-chip computer that integrates a CPU core, program memory, data memory, timers, and peripheral interfaces into one IC. The AVR family popularized the modified Harvard RISC architecture, in which most instructions execute in a single clock cycle; within the power-management hierarchy, an MCU like this sits at the lowest level of an embedded system, directly driving sensors, displays, and communication peripherals without an external CPU.
Key features include the AVR enhanced RISC core executing 130-131 powerful instructions, 32 general-purpose working registers, 32 I/O lines across multiple ports, JTAG boundary-scan and on-chip debugging, and an In-System Programmable (ISP) FLASH that allows firmware updates on the assembled PCB. The V-grade voltage rating of 1.8V to 5.5V enables direct battery operation from two or three cells as well as 5V industrial rails.
Architecturally, the two-stage pipeline overlaps instruction fetch and execution, delivering close to 1 MIPS per MHz. Peripherals typically include an 8-channel 10-bit ADC, USART, SPI, and multiple 8-bit and 16-bit timers with PWM, allowing the device to replace external glue logic in measurement and control boards.
Typical applications include industrial control panels with segmented LCD or discrete LED interfaces, battery-powered metering and datalogging equipment, and building-automation sensor nodes, all of which benefit from the wide voltage range and rich port count of the 100-pin footprint.
A key design consideration is clock selection: at 8MHz maximum rating, the V-variant suits low-speed, low-power designs; do not clock it above 8MHz or select the faster P/A grades unless the supply budget permits.
This page synthesizes distributor availability data, same-family drop-in alternatives, and practical design guidance not found in the manufacturer datasheet, with pricing referenced as of 2026-09-17.
Drop-in alternatives for ATMEGA3250V-8AUR — 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 ATMEGA3250V-8AUR (same form factor and footprint) — differing in Package, Instructions, Operating Temperature, Supply Voltage Range, Number of I/O.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA3250V-8AI
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA3250PA-AUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.98 / Unit
View Datasheet →ATMEGA3250P-20AU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.8 / Unit
View Datasheet →ATMEGA3250-16AU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.74 / Unit
View Datasheet →ATMEGA3290PV-10AUR
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA3250V-8AUR Maximum Ratings & Electrical Characteristics
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 8 MHz |
| Program Memory Type | FLASH (In-System Programmable) |
| Program Memory Size | 32 KB (16K x 16) |
| EEPROM Size | 1 KB |
| RAM Size | 2 KB |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Number of I/O | 32 I/O (multi-port) |
| Instructions | 130-131 powerful instructions, most single-clock cycle |
| General Purpose Registers | 8 x 32-bit register file (32 x 8-bit working registers) |
| Debug / Scan | JTAG (IEEE 1149.1 boundary scan) and on-chip debug |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 100-TQFP (14x14 mm, 0.8 mm pitch) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (TR) |
| RoHS Status | Compliant (Green) |
| Life Cycle Stage | Active |
ATMEGA3250V-8AUR 100-tqfp (14x14 mm, 0.8 mm pitch) Pin Configuration Guide
Pin configuration for ATMEGA3250V-8AUR (100-tqfp (14x14 mm, 0.8 mm pitch) 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 ATMEGA3250V-8AUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA3250V-8AUR is suitable for 6 applications: Industrial Control Panels, Battery-Powered Metering and Datalogging, Building Automation Sensor Nodes, Appliance and White-Goods Control, Test and Measurement Fixtures, Motor Control Subsystems.
Industrial Control Panels
The ATMEGA3250V-8AUR fits industrial control and panel boards because its 32 I/O lines on a single 100-TQFP directly drive relays, indicators, and keypad matrices, while the 1.8V to 5.5V supply range tolerates noisy 5V industrial rails. The 8MHz ceiling is sufficient for scan-based control loops running at millisecond rates, and the industrial -40C to +85C rating covers unconditioned factory-floor environments. In-system programmable 32KB FLASH supports field firmware updates through the SPI ISP port, and JTAG boundary scan enables full production-line connection testing of the dense 100-pin footprint without a custom fixture.
Recommended
Battery-Powered Metering and Datalogging
For energy meters and dataloggers, the V grade's 1.8V to 5.5V operation allows direct two-cell battery input without a boost converter, reducing quiescent losses. The AVR's power-down and power-save sleep modes let the MCU idle between measurement intervals, waking on timer or external interrupts to sample the 10-bit ADC and timestamp readings into the 1KB EEPROM or external memory over SPI. At 8MHz maximum clock, active current is minimized versus faster grades. The 2KB SRAM buffers measurement records, and the 32KB FLASH stores protocol stacks and calibration routines executed by the single-cycle AVR core.
Recommended
Building Automation Sensor Nodes
Building automation nodes benefit from the ATMEGA3250V-8AUR's combination of a USART, SPI, and multiple timers with PWM, which interface temperature, humidity, and occupancy sensors to RS-485 or wireless modules. The 1.8V to 5.5V industrial-grade supply supports both battery and PoE-adjacent 5V designs, and the 8MHz rating matches low-duty-cycle sensing tasks where the core sleeps most of the time. The 32 I/O lines drive DIP switches and status LEDs, while JTAG aids commissioning. The generous 100-pin TQFP provides routing freedom on two-layer control boards, cutting PCB cost in high-volume deployments.
Recommended
Appliance and White-Goods Control
Home appliance controllers use the ATMEGA3250V-8AUR to sequence motors, heaters, and displays: the timers generate PWM for motor and heater control, the ADC reads NTC temperature sensors, and the 32 I/O lines manage buttons and seven-segment or LED displays. The 5.5V maximum supports mains-derived transformer supplies with simple regulation, and the AVR's watchdog timer plus brown-out detection meet the reliability expectations of white-goods environments. Its industrial temperature rating and RoHS-compliant green package simplify global certification, while ISP FLASH supports late-stage firmware changes during manufacturing.
Recommended
Test and Measurement Fixtures
Bench instruments and production test fixtures exploit the ATMEGA3250V-8AUR's JTAG boundary scan and 32 I/O lines to drive stimulus and capture responses across a device under test. The deterministic single-cycle-per-instruction AVR core provides predictable timing for protocol bit-banging, and the USART bridges to a PC for control and logging. Operation from 5V gives direct logic-level compatibility with common sensor and DAC boards, while the 10-bit ADC measures analog pass/fail thresholds. The 100-TQFP's port density replaces discrete shift registers, simplifying fixture PCB design and reducing component count.
Recommended
Motor Control Subsystems
Low-end motor control, including DC fan, pump, and small brushless drivers, is well served by the ATMEGA3250V-8AUR's 16-bit timer with PWM outputs and input-capture for tachometer feedback. The 8MHz core executes speed-loop control at kilohertz rates with ample margin, and the ADC reads current shunts for over-current protection implemented in firmware. The 1.8V to 5.5V range matches both 3.3V and 5V gate-driver interfaces, and 32 I/O lines handle direction, enable, and fault signaling. JTAG debugging supports closed-loop tuning on the assembled controller board.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA3250V-8AUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA3250V-8AI | ATMEGA3250PA-AUR | ATMEGA3250P-20AU | ATMEGA3250-16AU | ATMEGA3290PV-10AUR |
|---|---|---|---|---|---|---|
| Package | 100-TQFP (14x14 mm) | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Speed | 8 MHz | 8 MHz | 20 MHz | 20 MHz | 16 MHz | 10 MHz |
| Flash / EEPROM / SRAM | 32KB / 1KB / 2KB | 32KB / 1KB / 2KB | 32KB / 1KB / 2KB | 32KB / 1KB / 2KB | 32KB / 1KB / 2KB | 32KB / 1KB / 2KB |
| 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 | 4.5 V to 5.5 V | 1.8 V to 5.5 V |
| PicoPower Features | No | No | Yes | Yes | No | No |
| Integrated LCD Controller | No | No | No | No | No | Yes |
| Temperature Grade | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Commercial (0C to +70C) | Commercial (0C to +70C) | Industrial (-40C to +85C) |
| Packaging Format | Tape & Reel (R suffix) | Tray (I suffix) | Tape & Reel | Tray | Tray | Tape & Reel |
Key Differentiators
- Lowest speed grade equals lowest active power (vs ATMEGA3250PA-AUR)
- Industrial temperature with wide-voltage V grade (vs ATMEGA3250P-20AU)
- Cost-optimized non-LCD variant (vs ATMEGA3290PV-10AUR)
Design Notes
Decouple the VCC and AVCC pins of the ATMEGA3250V-8AUR individually with 100nF ceramic capacitors placed within 5mm of each pin, plus a 10uF bulk capacitor per supply domain. If the ADC is used, connect AVCC to VCC through a low-pass LC filter and tie AREF to a clean reference with 100nF; this is the standard pattern shown in the Microchip datasheet typical-application section and measurably improves ADC noise performance.
Do not exceed 8MHz with this V-grade part: the 8 in ATMEGA3250V-8AUR is a hard speed limit tied to the low-voltage silicon process, and overclocking voids timing and datasheet guarantees. If your design needs 16-20MHz, select the pin-compatible ATMEGA3250PA-AUR or ATMEGA3250-16AU instead. Also verify the brown-out detector threshold matches your supply rail, since BOD levels differ between 1.8V-class and 5V designs.
Route the JTAG (TCK, TMS, TDO, TDI) traces to test points even if production firmware disables JTAG via fuse programming; keeping them accessible enables boundary-scan production test of the 100-TQFP assembly and field reprogramming through a JTAG ICE. Keep the ISP SPI lines (MOSI, MISO, SCK) short and add series 33-100 ohm resistors if they also serve as board-level I/O to reduce ringing.
Estimated: with a typical active current well below 15mA at 5V and 8MHz, power dissipation is under 75mW, so the 100-TQFP needs no heatsink and a standard SMD land pattern per the TQFP-100 footprint suffices; junction rise is negligible (<2C above ambient). Thermal design effort should focus on nearby power components rather than the MCU itself.
Compliance Information
RoHS compliant Green package per Microchip/distributor listings (FindIC: IND TEMP, GREEN). REACH and conflict-minerals declarations not stated in provided data.
