Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Architecture | 8-bit AVR |
| Maximum Frequency | 20 MHz |
| Flash Memory | 32 KB |
| SRAM / EEPROM | 2 KB / 1 KB |
| Supply Voltage | 1.8 V to 5.5 V |
| ADC | 10-bit, up to 8 channels in TQFP |
| Package | TQFP-32, 7 × 7 mm |
| Manufacturer Status | Not Recommended for New Designs |
Product Overview
ATMEGA328P-AU is the 32-pin TQFP ordering option of Microchip’s ATmega328P 8-bit AVR microcontroller. It combines 32 KB of in-system programmable Flash, 2 KB SRAM and 1 KB EEPROM with a wide 1.8 V to 5.5 V supply range. The AU suffix is important for purchasing because it identifies the surface-mount TQFP-32 package rather than the through-hole or QFN alternatives in the family.
For embedded designs, the device provides a 10-bit ADC, timers/PWM, USART, SPI and TWI/I²C interfaces with 23 programmable I/O lines. Its mature AVR ecosystem remains useful for maintaining established designs, but lifecycle status should be considered separately from technical familiarity.
Technical Specifications
| Group | Parameter | Value / Condition |
|---|---|---|
| Core | Architecture | 8-bit AVR |
| Core | Maximum frequency | 20 MHz |
| Memory | Flash | 32 KB |
| Memory | SRAM | 2 KB |
| Memory | EEPROM | 1 KB |
| Supply | Operating range | 1.8 V to 5.5 V |
| Analog | ADC | 10-bit; up to 8 channels in TQFP |
| I/O | Programmable I/O | 23 lines |
| Communication | USART | 1 |
| Communication | SPI | Supported |
| Communication | TWI / I²C | Supported |
| Package | Type | TQFP-32 |
| Operating | Temperature | -40 °C to +85 °C |
Product Status
| Item | Information |
|---|---|
| Manufacturer Status / Lifecycle | Not Recommended for New Designs |
Microchip currently identifies the ATmega328P family as Not Recommended for New Designs.
Functional Highlights
Lifecycle status changes the design decision
Microchip currently marks ATMEGA328P as Not Recommended for New Designs. Existing equipment and legacy BOM support can still require the part, but a new platform should evaluate the manufacturer’s recommended migration path before committing to a long product life.
Nonvolatile memory is integrated
The combination of 32 KB Flash and 1 KB EEPROM lets firmware and persistent configuration coexist without an external serial EEPROM in many small-control designs.
Applications / Application Fit
- Maintenance and production support for established AVR-based products
- Simple embedded controllers with analog sensing and serial interfaces
- Control panels and peripheral controllers with modest code and RAM requirements
Design Considerations
For a new design, treat the manufacturer’s NRND status as a sourcing and lifecycle input, not just a documentation note.
Verify voltage/frequency operating limits together; the maximum clock rate is not valid at every supply voltage.
Confirm that the TQFP-32 pinout and ADC channel count match the existing PCB before replacing another package variant.
Related Engineering Resources
- Microchip Technology official product/family page — manufacturer-controlled product information and documentation.
- ATMEGA328P-AU verified Datasheet PDF — identity-verified PDF hosted on HKEQGOO assets.
Alternative Candidates for Engineering Evaluation
| MPN | Manufacturer | Package |
|---|---|---|
| ATMEGA328P-AUR | Microchip Technology | TQFP-32 |
| ATMEGA328-AU | Microchip Technology | TQFP-32 |
| ATMEGA328-AUR | Microchip Technology | TQFP-32 |
| ATMEGA328P-AN | Microchip Technology | TQFP-32 |
| ATMEGA328P-ANR | Microchip Technology | TQFP-32 |
Candidate alternative parts require engineering verification before substitution. Electrical characteristics, pinout, package, qualification, and application requirements should be verified before use.
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
Request a Quote
To request a quotation, provide the manufacturer part number, required quantity, destination, target Date Code if applicable, and any testing or inspection requirements.
