Specs side by side
2 parts compared · 14 differing specs across 14 total parameters.
| Parameter | ||
|---|---|---|
| Supply voltage | - | 1.8V to 5.5V, same as the 328P; 20MHz class. |
| Memory & Peripherals | - | Backward compatible peripherals with the additions listed above; existing code runs after toolchain support is in place. |
| Case | DIP-28 / TQFP-32 / QFN-32 | TQFP-32 / QFN-32 |
| Compatibility Level | - | Pin-to-Pin (Minor Clock/Init Tuning) |
| Component Category | Embedded Microcontrollers (AVR) | - |
| Core & Architecture | - | Microchips successor device: same AVR core and 32KB/2KB/1KB memory map, plus a second USART, second SPI, second TWI, extra 16-bit timers, a peripheral touch controller and a unique device ID. |
| Firmware Notes | - | Microchip documents the PB as a new device, not a formal drop-in: the device signature differs (0x1E9516 versus 0x1E950F), so avrdude / older board cores reject the chip until the correct part is selected. Boards whose firmware was locked to the old signature need the toolchain updated - that is the whole migration work. |
| Hardware Notes | - | In TQFP-32, two pins that were VCC and GND on the 328P become GPIO (PE0 / PE1), and the two analog-only pins (ADC6 / ADC7) become digital I/O (PE2 / PE3). A board tying those pins directly to rails must be reviewed before the PB is fitted - otherwise it is a same-footprint swap. |
| Lead Time Advantage | - | Shenzhen Spot Stock (24-48h Dispatch) |
| Market Reality | The ATmega328P is the Arduino-era workhorse that escaped into industry: thousands of instrument, controller and appliance boards still run it, and repair benches re-order it every week. Genuine Microchip supply continues, and the market knows it - which is why relabeled and re-marked stock circulates (the classic tell is a bootloader that reports one signature while the silicon reads another). The two real substitution questions are the ATmega328PB migration (a new device with the same socket, per Microchips own app note) and the smaller-flash siblings that share the pinout. | - |
| Reference Part | - | ATmega328P |
| Role In Circuit | Original Reference Part | - |
| Sourcing Advantage | - | Active current production; the long-term safe buy for 328P sockets. |
| Sourcing Status | Active Shenzhen Spot Sourcing (24–48h) | - |
Parts
- ATmega328P · microchip
- ATmega328PB · microchip