AT32UC3A3256AU-ALUT Microchip Integrated Circuit (Quad Flat Packages) In Stock
Microchip AT32UC3A3256AU-ALUT is a 32-bit AVR RISC microcontroller with 256KB Flash, USB 2.0 high-speed OTG, audio-grade DAC, and DMA running at up to 66 MHz. Features 16-bit external data bus, 12-bit ADC, and industrial temperature rating in a QFP package. Available from stock with worldwide shipping.
- Manufacturer
- Microchip
- Package
- Quad Flat Packages
- Pin Count
- 144
- Lifecycle
- OBSOLETE
- Datasheet
- AT32UC3A3256AU-ALUT Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 256KB Flash with 32-bit AVR RISC core running up to 66 MHz delivers high-speed audio processing and industrial control in a single MCU
- USB 2.0 High-Speed OTG at 480 Mbit/s enables direct connection to USB hosts and devices for audio streaming and data transfer
- Integrated audio-grade DAC and DMA channels support real-time digital audio output without external DAC ICs or CPU streaming overhead
- 16-bit external data bus with 24-bit address space allows connection to external SRAM and SDRAM for large buffer audio applications
Applications
The AT32UC3A3256AU-ALUT is designed for audio-capable industrial applications such as voice-controlled HMI panels, USB audio interfaces, and factory automation controllers requiring both high-speed computation and audio playback. Its USB 2.0 high-speed OTG interface enables portable audio recorders, USB class compliant audio adapters, and industrial diagnostic devices that stream data to a PC at 480 Mbit/s. The 256KB Flash and external bus interface also support industrial control systems with graphical displays or large data buffers connected via external SRAM.
Specifications
| YTEOL | 0 |
| Has ADC | YES |
| Address Bus Width | 24 |
| Bit Size | 32 |
| Boundary Scan | YES |
| CPU Family | AVR RISC |
| Clock Frequency-Max | 20MHz |
| DAC Channels | YES |
| DMA Channels | YES |
| External Data Bus Width | 16 |
| Format | FLOATING POINT |
| Integrated Cache | YES |
| JESD-30 Code | S-PQFP-G144 |
| Low Power Mode | YES |
| Number of DMA Channels | 12 |
| Number of External Interrupts | 8 |
| Number of I/O Lines | 110 |
| Number of Serial I/Os | 4 |
| Number of Timers | 6 |
| On Chip Data RAM Width | 8 |
| On Chip Program ROM Width | 8 |
| PWM Channels | YES |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | QFP144,.87SQ,20 |
| Package Shape | SQUARE |
| Package Style | FLATPACK, LOW PROFILE, FINE PITCH |
| RAM (bytes) | 131072 |
| ROM (words) | 262144 |
| ROM Programmability | FLASH |
| Speed | 66MHz |
| Supply Voltage-Max | 1.95V |
| Supply Voltage-Min | 1.85V |
| Supply Voltage-Nom | 1.85V |
| Surface Mount | YES |
| Technology | CMOS |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| uPs/uCs/Peripheral ICs Type | MICROCONTROLLER, RISC |
| Package | Quad Flat Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.31.00.25 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What clock frequency does the AT32UC3A3256AU-ALUT reach, and how does it compare to its AVR 8-bit predecessors?
The AT32UC3A3256AU-ALUT runs at up to 66 MHz with its 32-bit AVR RISC core, delivering roughly 4x the raw instruction throughput of a classic 8-bit AVR running at 16 MHz. The 32-bit data path also processes audio samples, FFT bins, and industrial sensor arrays in fewer cycles, making it more suitable for DSP-intensive tasks than any 8-bit AVR predecessor in the same power envelope.
How does the USB 2.0 High-Speed OTG on the AT32UC3A3256AU-ALUT benefit audio device designs?
The USB 2.0 High-Speed OTG at 480 Mbit/s allows the AT32UC3A3256AU-ALUT to implement USB Audio Class 2.0 interfaces streaming 24-bit/96 kHz stereo audio with minimal latency, far exceeding the 12 Mbit/s Full-Speed limit that constrains USB Audio Class 1.0 devices. This eliminates the need for an external USB controller IC in portable USB DAC, USB microphone, and USB audio interface products.
What ADC and DAC capabilities does the AT32UC3A3256AU-ALUT provide for analog signal processing?
The AT32UC3A3256AU-ALUT integrates a 12-bit ADC for analog input sampling and an audio-grade DAC for analog output generation, both accessible via DMA for continuous streaming without CPU intervention. The 12-bit ADC resolution provides 4096 levels suitable for industrial sensor conditioning, while the DAC supports audio playback and analog set-point output in industrial control applications—eliminating the need for separate discrete ADC and DAC components.
For an industrial audio HMI panel, why might AT32UC3A3256AU-ALUT be chosen over a simpler Cortex-M0 MCU?
An industrial audio HMI panel requires simultaneously managing USB audio streaming at 480 Mbit/s, DAC output, ADC input, and display control, tasks that would saturate a 48 MHz Cortex-M0 with only 32KB SRAM. The AT32UC3A3256AU-ALUT's 256KB Flash, 16-bit external bus for additional SRAM, DMA channels, and 66 MHz AVR32 core provide headroom for a full audio processing pipeline plus display rendering, reducing system complexity and board cost by consolidating two chips into one.
Related Guides
How to Choose a BAS70 Schottky Diode for Signal Clamping: Selection Guide
A practical BAS70KFILM and BAS70-family Schottky diode selection guide for signal clamping, RF detection, leakage, and topology choices.
Jul 4, 2026
AMC1202DWVR Design Guide for Isolated Current Sensing
Practical AMC1202DWVR design guide covering shunt sizing, isolation layout, input filtering, ADC scaling, and sourcing choices.
Jul 4, 2026
1206 100 uF MLCC Design Guide for Compact Bulk Decoupling
Design guidance for applying CL31A107MQHNNNE and related 1206 MLCCs in compact bulk decoupling networks.
Jul 3, 2026
0402 10 nF MLCC Design Guide for High-Speed Decoupling
Practical design guidance for using CL05B103KB5NNNC and related 0402 MLCCs in high-speed decoupling networks.
Jul 3, 2026
Why Buy from FindMyChip
About Microchip
Microchip is a leading electronic component manufacturer. FindMyChip sources Microchip ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“FindMyChip sourced our entire STM32 BOM in 48 hours when our usual distributor had 16-week lead times.”