ATMEGA16U2 Microchip Integrated Circuit (Quad Flat No-Lead) In Stock
Microchip ATMEGA16U2 is an 8-bit AVR microcontroller with integrated USB 2.0 controller, running at up to 16 MHz with 16 KB Flash memory in a compact 32-VQFN 5x5 mm package. It features 512-byte EEPROM, 512-byte SRAM, and full-speed USB device interface. Available in stock with worldwide shipping.
- Manufacturer
- Microchip
- Package
- Quad Flat No-Lead
- Pin Count
- 33
- Lifecycle
- ACTIVE
- Datasheet
- ATMEGA16U2 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Integrated USB 2.0 full-speed controller eliminates the need for external USB bridge chips
- 8-bit AVR core running at up to 16 MHz with 16 KB Flash for efficient firmware execution
- Compact 32-VQFN 5x5 mm package saves board space in USB-connected embedded designs
- 512-byte EEPROM for non-volatile parameter storage without external memory components
Applications
The ATMEGA16U2 is widely used as a USB-to-serial bridge on development boards such as Arduino Uno and Mega, where it enables USB communication between the host PC and the main microcontroller. It is also deployed in custom HID (Human Interface Device) applications, USB audio interfaces, and data acquisition systems that require a low-cost, integrated USB solution. Its small VQFN package and on-chip USB PHY make it ideal for space-constrained consumer and industrial USB peripheral designs.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for ATMEGA16U2:
suggested
suggested
suggested
Frequently Asked Questions
What USB standard does the ATMEGA16U2 natively support and at what speed?
The ATMEGA16U2 includes a built-in USB 2.0 full-speed interface operating at 12 Mbps, enabling direct USB device connectivity without external bridge ICs. This makes it suitable for HID, CDC, and mass-storage class implementations in embedded designs with tight BOM constraints.
How much Flash and SRAM does the ATMEGA16U2 provide for firmware and runtime data?
The ATMEGA16U2 provides 16 KB of Flash memory for program storage and 512 bytes of SRAM for runtime variables, plus 512 bytes of EEPROM. While limited compared to larger MCUs, these resources are sufficient for USB bridge, bootloader, and lightweight protocol stack applications.
For a compact USB peripheral design, how does the ATMEGA16U2's 32-VQFN package compare to DIP options?
The 32-VQFN 5x5 mm package occupies roughly 25 mm² of board area, approximately 60-70% less than a comparable DIP-32 footprint. This reduction in PCB area is critical for portable USB devices, wearable gadgets, and multi-board system designs where space is at a premium.
When is ATMEGA16U2 a better choice than an external USB-to-UART bridge chip for a microcontroller board?
ATMEGA16U2 is preferred when firmware-upgradeable USB behavior, custom USB class support, or minimal external component count are required. Unlike fixed-function USB-UART bridges operating at standard baud rates, the ATMEGA16U2 at 16 MHz can implement custom protocols with 16 KB of reprogrammable Flash.
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