Microchip ATMEGA328PB

Mfr. Part

ATMEGA328PB

Manufacturer

Microchip Technology (Micrel is part of Microchip after acquisition). Y-IC is a quality distributor of Microchip. We deliver genuine parts, fast fulfillment, and dependable service so you get the best products and support.

Detailed Description

8-bit AVR microcontroller, enhanced “PB” version of the popular ATmega328P. 32 KB Flash, 2 KB SRAM, 1 KB EEPROM. Runs up to 20 MHz over a wide 1.8–5.5 V supply range. Adds more peripherals than ATmega328P, including dual USART and dual TWI/I2C, extra I/O, and expanded analog features. Compact 32-pin packages for space‑constrained designs. Ideal for low-power, easy-to-use embedded systems. Current stock available: 2200 units.

Key Features

8-bit AVR CPU with efficient instruction set and fast interrupt handling

32 KB In-System Programmable Flash, 2 KB SRAM, 1 KB EEPROM

Clock up to 20 MHz with internal and external oscillator options

Dual USART, dual TWI/I2C, SPI, analog comparator

10-bit ADC with multiple channels and selectable reference

Timers and counters with PWM outputs for precise control

Watchdog, brown-out detection, multiple sleep modes for low power

In-System Programming (ISP) and debugWIRE support

Wide supply range 1.8–5.5 V and broad temperature grades

RoHS compliant and lead-free options

Key Advantages

Simple 8-bit architecture that is easy to program and maintain

Very low power in sleep modes, suitable for battery-powered devices

Mature toolchain and libraries, strong community support, Arduino-friendly

Reliable long-term supply from Microchip and broad second-source options

Compact 32-pin packages for tight PCB layouts

Industrial and automotive grade variants for demanding environments

Packaging

Type: Surface-mount ICs commonly supplied in Tape & Reel for automated assembly; Tray options available

Material: Molded epoxy package with copper lead frame; lead-free, RoHS compliant

Size (typical by package family):

- TQFP-32 about 7 x 7 mm body, ~0.8 mm lead pitch

- QFN/VQFN-32 about 5 x 5 mm body, ~0.5 mm lead pitch

Pin configuration: 32 pins with general-purpose I/O across Port B, Port C, and Port D; pins multiplexed for USART, TWI/I2C, SPI, ADC inputs, PWM, and oscillator

Thermal characteristics:

- Operating temperature: -40 to +85°C (industrial), -40 to +105°C (automotive variants)

- Typical thermal resistance values vary by package (QFN lower than TQFP); refer to datasheet for exact numbers

Electrical properties (high-level):

- Supply voltage: 1.8–5.5 V

- CPU frequency up to 20 MHz

- 10-bit ADC with multiple channels

- Multiple low-power sleep modes; brown-out and watchdog for reliability

Package / Case: 1057 (internal package/case reference; contact us if you need the exact mechanical code matched to your order)

Lifecycle

Status: Active. Not nearing discontinuation based on current Microchip guidance.

Common equivalents and alternatives:

- ATmega328P series (ATmega328P-AU TQFP-32, ATmega328P-MU QFN-32, ATmega328P-PU 28-DIP). Note: 328PB adds extra peripherals (for example, dual USART and dual TWI/I2C), so check pin/peripheral differences.

- ATmega168PB (smaller Flash, similar peripherals) for cost-sensitive designs

- ATmega32U4 (adds USB, different pinout and peripherals)

- ATmega4809 (newer AVR with more capability; used on newer Arduino boards; different architecture details and pinout)

- PIC alternatives from Microchip: PIC16F18855 and PIC18F26K22 (architecture change; performance and peripherals differ)

If you need exact drop-in or pin-to-pin substitutes for your PCB and firmware, contact our sales team on the Y-IC website for a verified cross-reference and availability.

Key Application Areas

Arduino-compatible boards and maker projects

IoT sensor nodes and gateways

Wearables and portable devices

Home automation and smart lighting

Small motor control and power management

Industrial controllers, HMIs, and data loggers

Automotive body electronics (with automotive-grade variants)

Datasheet

Y-IC hosts the most authoritative datasheet and technical resources for ATMEGA328PB on our product page. We recommend downloading the datasheet here now for exact specifications, pin mapping, timing, thermal data, and application guidance.

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