ATMEGA3250V-8AU - 8-bit AVR MCU 32KB 8MHz 100-TQFP | Microchip
MPN: ATMEGA3250V-8AU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.18 | $2.18 |
| 10 | $1.98 | $19.80 |
| 100 | $1.78 | $178.00 |
| 500 | $1.62 | $810.00 |
| 1,000 | $1.45 | $1,450.00 |
ATMEGA3250V-8AU Overview
An AVR ATmega microcontroller is a family of 8-bit Harvard-architecture MCUs that combine flash program memory, SRAM, EEPROM, timers, ADC, and serial interfaces on a single chip. Within the power-management hierarchy of embedded systems, the ATmega3250 sits in the mid-range segment, executing most of its 131 instructions in a single clock cycle via its advanced RISC core with 32 general-purpose working registers.
Key features include 54 general-purpose I/O lines for large peripheral counts, an 8-channel 10-bit ADC, JTAG for on-chip debugging and boundary scan, and read-while-write flash for in-system self-programming. The V speed grade permits full 8 MHz operation down to 1.8 V, unlike the standard ATmega3250 which requires a higher minimum voltage.
The AVR core pairs a two-stage pipeline with single-cycle ALU operations, delivering roughly 1 MIPS per MHz. Memory is organized as 32 KB FLASH with 16 K x 16 addressing, 2 KB internal SRAM, and 1 KB endurance-rated EEPROM accessed through an address register pair. On-chip peripherals include 8-bit and 16-bit timers with PWM, USART, SPI, and TWI (I2C) serial engines.
Typical applications include industrial control panels with many buttons and LEDs, battery-powered metering instruments that exploit the 1.8 V operation, and building automation nodes using the 54 GPIO plus TWI/SPI expansion. The JTAG interface shortens development cycles on dense 100-pin boards.
Design consideration: at 8 MHz maximum frequency, choose the ATMEGA3250P-20AU or ATMEGA3250-16AU variants when 5 V operation and higher clock speed are needed; the V device trades speed for the widest voltage window. Decouple VCC/AVCC pins individually and connect all ground pins to a solid plane.
This page synthesizes distributor pricing, drop-in alternatives, comparison tables, and practical design notes not found in the manufacturer datasheet, with pricing referenced as of 2026-09-17.
Drop-in alternatives for ATMEGA3250V-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 ATMEGA3250V-8AU (same form factor and footprint) — differing in Package, Instructions, Supply Voltage Range, Operating Temperature, Connectivity.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA3250PA-AUR
✅ Drop-In✓ In Stock
$2.98 / Unit
View Datasheet →ATMEGA3250P-20AU
✅ Drop-In✓ In Stock
$1.8 / Unit
View Datasheet →ATMEGA3250-16AU
✅ Drop-In✓ In Stock
$5.74 / Unit
View Datasheet →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 →ATMEGA3250V-8AU Maximum Ratings & Electrical Characteristics
| Core Processor | AVR |
| Core Size | 8-Bit |
| Max Clock Speed | 8 MHz |
| FLASH Program Memory | 32 KB (16K x 16) |
| EEPROM | 1 KB |
| SRAM | 2 KB |
| Supply Voltage Range | 1.8 V to 5.5 V |
| General Purpose I/O | 54 I/O lines (69 total I/O per family listing) |
| ADC Resolution | 10-bit |
| Instructions | 131 powerful instructions, most single-cycle |
| Working Registers | 32 x 8-bit general purpose |
| Debug Interface | JTAG (on-chip debug and boundary scan) |
| Package | 100-TQFP (14 x 14 mm, 0.8 mm pitch) |
| Mounting Type | Surface Mount |
| Programming | ISP (In-System Programmable), ICSP via MPLAB SNAP |
| Lifecycle Status | Active |
ATMEGA3250V-8AU 100-tqfp (14 x 14 mm, 0.8 mm pitch) Pin Configuration Guide
Pin configuration for ATMEGA3250V-8AU (100-tqfp (14 x 14 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-8AU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA3250V-8AU is suitable for 6 applications: Industrial Control Panels, Battery-Powered Metering Instruments, Building Automation Nodes, Consumer Appliance Displays and User Interfaces, Automotive-Adjacent Body Electronics (Non-Safety), Embedded Development and Prototyping.
Industrial Control Panels
The ATMEGA3250V-8AU fits industrial control panels where dozens of buttons, LEDs, and relays must be driven directly. Its 54 general-purpose I/O lines eliminate most port expanders, and the 100-TQFP package concentrates the routing on a single 14 x 14 mm footprint. The 32 KB FLASH accommodates menu structures and protocol stacks, while the 1 KB EEPROM stores configuration and counters through power cycles. JTAG boundary scan supports production test of dense boards. Placed on a 5 V industrial rail, the part runs its AVR core at the full 8 MHz, giving about 8 MIPS for scan loops and Modbus handling; TVS protection on the I/O banks is recommended for noisy cabinet environments.
Recommended
Battery-Powered Metering Instruments
The ATMEGA3250V-8AU's defining advantage for battery metering is its 1.8 V to 5.5 V operating window: the MCU keeps running as a two-cell stack discharges below 2 V without a boost converter, removing one whole failure point and its quiescent cost. The 10-bit ADC samples voltage and current channels directly at low rail conditions, and the 1 KB EEPROM logs cumulative register values through power loss. At 8 MHz the AVR delivers roughly 8 MIPS, adequate for tariff schedulers and LCD driving, while AVR sleep modes cut average current between samples. Board designers should separate AVCC with an RC filter so ADC readings stay quiet during digital activity.
Recommended
Building Automation Nodes
In building automation, the ATMEGA3250V-8AU serves as a zone controller node combining sensor inputs, keypad interface, and fieldbus connectivity. The TWI (I2C) and SPI engines connect environmental sensors and RTC chips, while the USART links to RS-485 transceivers for long cable runs. With 32 KB FLASH there is room for a full protocol stack plus a bootloader supporting field firmware updates over the bus via read-while-write self-programming. The 54 GPIOs drive dampers, valves, and status LEDs without expansion ICs, and JTAG enables boundary-scan production testing. On long-shared buses, add series termination and transient protection at the transceiver since the MCU pins themselves are not fault-tolerant.
Recommended
Consumer Appliance Displays and User Interfaces
Appliance user interfaces benefit from the ATMEGA3250V-8AU's combination of many I/O lines and low-voltage tolerance. Touch matrices, rotary encoders, segment LCDs, and buzzer outputs all attach directly to the 54 GPIO bank, and the 10-bit ADC reads NTC temperature sensors for cooking or climate feedback. The 2 KB SRAM handles localization string tables, and the 32 KB FLASH supports multi-language menu firmware. Running at 5 V, the MCU uses timer PWM outputs for LED backlight dimming without extra driver ICs. Designers should debounce inputs in firmware using a timer interrupt and reserve one EEPROM block for calibration constants written during factory test.
Recommended
Automotive-Adjacent Body Electronics (Non-Safety)
For non-safety automotive body modules such as seat controllers and lighting sequencers, the ATMEGA3250V-8AU provides the broad GPIO count and 5 V noise immunity that 12 V-load-switched environments demand, provided industrial temperature variants like ATMEGA3250V-8AI are selected. The AVR timers generate PWM for LED dimming and motor ramp control, while the 10-bit ADC reads position potentiometers and current-sense amplifiers. Its 2 KB SRAM supports diagnostic buffers for UDS-style service routines. Because this device is not AEC-Q100 qualified per the retrieved data, restrict its use to non-safety, cost-sensitive modules and add load-dump clamping on the supply input front end.
Recommended
Embedded Development and Prototyping
The ATMEGA3250V-8AU is a practical prototyping target because Microchip supports it with MPLAB SNAP in-circuit debugging and ICSP through just two I/O pins plus reset, per the official product page. JTAG adds full on-chip debugging and boundary scan on dense 100-pin boards, which accelerates bring-up when mapping 54 GPIO banks. The read-while-write flash allows iterative bootloader development without external programmers after the first flash. Wide 1.8 V to 5.5 V operation lets one prototype board validate both 3.3 V and 5 V power trees. Keep the 8 MHz ceiling in mind when porting timing-critical code from 16 to 20 MHz siblings such as ATMEGA3250-16AU.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA3250V-8AU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA3250PA-AUR | ATMEGA3250P-20AU | ATMEGA3250-16AU | ATMEGA3250V-8AI |
|---|---|---|---|---|---|
| Package | 100-TQFP (14x14 mm) | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Speed | 8 MHz | 20 MHz | 20 MHz | 16 MHz | 8 MHz |
| FLASH | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| Supply Voltage Range | 1.8 V to 5.5 V (V grade) | Higher minimum voltage than V grade | Higher minimum voltage than V grade | Higher minimum voltage than V grade | 1.8 V to 5.5 V (V grade) |
| picoPower Technology | No | Yes | Yes | No | No |
| Lifecycle Status | Active | Active | Active | Active | Active |
Key Differentiators
- Widest supply voltage window in the ATmega3250 family (vs ATMEGA3250-16AU)
- Lowest unit cost path for 32 KB / 54-GPIO designs at modest speed (vs ATMEGA3250P-20AU)
- JTAG on-chip debug and boundary scan (vs ATMEGA324PA-AUR)
- Trade-off: no picoPower sleep optimization (vs ATMEGA3250PA-AUR)
Design Notes
Connect all VCC and AVCC pins of the 100-TQFP to the supply rail and all GND pins to a solid ground plane; the AVR datasheet requires AVCC to stay within 0.3 V of VCC even when the ADC is unused. Because this V-grade part must regulate down to 1.8 V, ensure your LDO or buck output stays above the minimum across load and temperature transients - brown-out reset should be enabled and set appropriately in the fuse configuration for reliable startup.
Place 100 nF ceramic decoupling capacitors directly at each VCC/GND pin pair, plus a 10 uF bulk capacitor near the IC. Route the crystal within a few millimeters of XTAL1/XTAL2 with guard ground. The 0.8 mm pitch TQFP escape routing works comfortably with 0.2 mm trace/space on standard PCB processes, so no HDI is needed. JTAG header placement should anticipate boundary-scan production test access to all four JTAG pins.
Do not assume clock compatibility when substituting: the V suffix caps operation at 8 MHz while PA/P variants run to 20 MHz, so firmware delay loops and baud rate registers written for a faster sibling will mis-time on this part. Similarly, the wide 1.8 V minimum is unique to the V grade - substituting a standard ATmega3250 in a 2.5 V system will violate its lower supply limit. Verify fuse settings (JTAG enable, brown-out level) before mass production.
Compliance Information
Compliance data was not present in the retrieved web data and must be confirmed on the Microchip product page. Not AEC-Q100 qualified per available family data - select purpose-built automotive parts for automotive safety-relevant use.
