ATMEGA328PB-MBTVAO - 8-Bit AVR MCU 32KB Flash QFN-32 | Microchip
MPN: ATMEGA328PB-MBTVAO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.9 | $29.00 |
| 100 | $2.55 | $255.00 |
| 500 | $2.3 | $1,150.00 |
| 1,000 | $2.1 | $2,100.00 |
ATMEGA328PB-MBTVAO Overview
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, delivering throughput close to 1 MIPS per MHz. Within the power-management hierarchy, it combines the CPU, program Flash, SRAM, EEPROM, timers, and communication peripherals (UART, SPI, I2C) in a single IC, making it the complete embedded control element of a board-level design.
Key differentiating features include the picoPower low-power technology for battery-operated designs, an enhanced peripheral set versus the ATmega328P (two USARTs, two I2C, two SPI peripherals), and AEC-Q100 automotive qualification with Functional Safety (FuSa) support. The 105C operating rating supports under-hood and industrial environments that standard commercial-grade parts cannot survive.
Architecturally, the ATmega328PB builds on the AVR enhanced RISC core with 32 general-purpose working registers, hardware multiplier, and a rich timer suite including two 8-bit and one 16-bit timer/counters plus an RTC-capable asynchronous timer. Software is backward compatible with the popular ATmega328P, easing firmware migration.
Typical applications include automotive body and comfort modules, industrial sensor nodes, IoT end devices, and motor-control auxiliaries, where the combination of 32 KB self-programmable Flash, dual serial buses, and -40C to +105C operation is decisive.
Design consideration: if migrating from an ATmega328P in a 32-pin QFN footprint, verify the extended peripheral pin-mapping on Port E; Microchip application notes state the 328PB is software-backward-compatible but not a blind pin-for-pin drop-in in every package option.
This page synthesizes distributor inventory, cross-reference data, pinout, and design guidance not consolidated in the manufacturer datasheet.
Drop-in alternatives for ATMEGA328PB-MBTVAO — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATMEGA328PB-MBTVAO (same form factor and footprint) — differing in Package, Operating Temperature, Peripherals, RoHS Status, Core Processor.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA328P-MU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.28 / Unit
View Datasheet →ATMEGA328-MUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.84 / Unit
View Datasheet →ATMEGA168PB-MU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.31 / Unit
View Datasheet →ATMEGA168PA-MU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.72 / Unit
View Datasheet →ATMEGA8A-MU
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA328PB-MBTVAO Maximum Ratings & Electrical Characteristics
| Core Processor | AVR |
| Core Size | 8-Bit |
| Program Memory Size | 32 KB (16K x 16) Flash |
| EEPROM Size | 2 KB |
| RAM Size | 4 KB SRAM |
| Maximum Clock Frequency | 20 MHz |
| Number of I/O | 27 general-purpose I/O lines |
| Package | 32-VFQFN (5x5 mm) |
| Operating Temperature | -40C to +105C (automotive) |
| Qualification | AEC-Q100, Functional Safety (FuSa) |
| Series | AVR ATmega, picoPower |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel |
| RoHS Status | Green / RoHS compliant |
| Peripherals | Two USARTs, two I2C, two SPI, timers, ADC |
ATMEGA328PB-MBTVAO Pin Configuration
| Pin 1 | PD3 — Port D bit 3 (GPIO / INT1 / OC2B) |
| Pin 2 | PD4 — Port D bit 4 (GPIO / XCK0 / T0) |
| Pin 3 | GND — Ground |
| Pin 4 | VCC — Digital supply voltage |
| Pin 5 | GND — Ground |
| Pin 6 | VCC — Digital supply voltage |
| Pin 7 | PB6 — Port B bit 6 (GPIO / XTAL1 / TOSC1) |
| Pin 8 | PB7 — Port B bit 7 (GPIO / XTAL2 / TOSC2) |
| Pin 9 | PD5 — Port D bit 5 (GPIO / XCK1 / OC0B / T1) |
| Pin 10 | PD6 — Port D bit 6 (GPIO / AIN0 / OC0A) |
| Pin 11 | PD7 — Port D bit 7 (GPIO / AIN1 / OC2B-ALT) |
| Pin 12 | PB0 — Port B bit 0 (GPIO / XCK0-ALT / T0-ALT) |
| Pin 13 | PB1 — Port B bit 1 (GPIO / OC1A) |
| Pin 14 | PB2 — Port B bit 2 (GPIO / SS / OC1B) |
| Pin 15 | PB3 — Port B bit 3 (GPIO / MOSI / OC2A) |
| Pin 16 | PB4 — Port B bit 4 (GPIO / MISO) |
| Pin 17 | PB5 — Port B bit 5 (GPIO / SCK) |
| Pin 18 | AVCC — Analog supply voltage for ADC |
| Pin 19 | PE0 / ADC6 — Port E bit 0 / ADC channel 6 (328PB-specific) |
| Pin 20 | AREF — Analog reference for ADC |
| Pin 21 | GND — Ground |
| Pin 22 | PE1 / ADC7 — Port E bit 1 / ADC channel 7 (328PB-specific) |
| Pin 23 | PC0 — Port C bit 0 (GPIO / ADC8 / SCL1) |
| Pin 24 | PC1 — Port C bit 1 (GPIO / ADC9 / SDA1) |
| Pin 25 | PC2 — Port C bit 2 (GPIO / ADC10) |
| Pin 26 | PC3 — Port C bit 3 (GPIO / ADC11) |
| Pin 27 | PC4 — Port C bit 4 (GPIO / ADC12 / SDA) |
| Pin 28 | PC5 — Port C bit 5 (GPIO / ADC13 / SCL) |
| Pin 29 | PC6 — Port C bit 6 / RESET (active low) |
| Pin 30 | PD0 — Port D bit 0 (GPIO / RXD0 / RXD1-ALT) |
| Pin 31 | PD1 — Port D bit 1 (GPIO / TXD0 / TXD1-ALT) |
| Pin 32 | PD2 — Port D bit 2 (GPIO / RXD1 / INT0) |
Typical Applications
ATMEGA328PB-MBTVAO is suitable for 6 applications: Automotive Body and Comfort Modules, IoT Sensor Nodes, Industrial Sensor and Actuator Control, Arduino-Compatible Development Boards, Home Appliance Control Panels, Motor Control Auxiliary Systems.
Automotive Body and Comfort Modules
The ATMEGA328PB-MBTVAO fits automotive body and comfort modules because it is AEC-Q100 qualified with Functional Safety (FuSa) support and rated -40C to +105C, temperatures typical of passenger-compartment and near-engine electronics. Its 27 GPIO lines drive window, seat, and lighting loads through external drivers, while the dual USART and dual I2C buses connect LIN transceivers and multiple sensor slaves concurrently. In circuit terms, the MCU sits between the KL15 supply rail and load drivers, with its picoPower sleep modes keeping key-off battery drain minimal - a quantified benefit for quiescent-current budgets typically specified under a few hundred microamps.
Recommended
IoT Sensor Nodes
For battery-powered IoT sensor nodes, the ATMEGA328PB-MBTVAO combines picoPower sleep technology, dual I2C, and dual SPI, letting a single MCU poll several environmental sensors while independently controlling a radio module such as an SPI transceiver. The 32 KB Flash and 4 KB SRAM hold protocol handling plus calibration code without external memory, and the 32-pin VQFN 5x5 mm footprint keeps the node PCB compact. A common topology places the MCU between a low-dropout regulator and sensor bus with 100 nF decoupling per rail; power-gating sensors between 8-second readings extends coin-cell life substantially versus always-on operation.
Recommended
Industrial Sensor and Actuator Control
In industrial control panels, the ATMEGA328PB-MBTVAO withstands the -40C to +105C extremes found near motors and power electronics, an advantage over commercial-grade 328P parts. The dual USARTs isolate a Modbus RTU field bus from a local debug console, while 16-bit timer PWM channels drive actuator drivers or valve solenoids. Its 10-bit ADC reads 4-20 mA loop signals via a sense resistor, and the hardware SPI connects an external EEPROM for parameter storage. Typical deployments pair the MCU with optocoupler-isolated inputs so that 24 V industrial signals never reach the 5 V MCU domain directly.
Recommended
Arduino-Compatible Development Boards
The ATmega328 family is the classic engine of Arduino-compatible boards, and the ATMEGA328PB extends this ecosystem with two USARTs, two I2C, and two SPI buses - valuable for boards that need a USB bridge on one UART while reserving the second for application use. Code and fuses are backward compatible with ATmega328P sketches, so existing bootloaders and the Arduino IDE toolchain apply with a board-definition update. On a Nano-class board the 32-pin QFN sits under the pin headers with a 16 MHz crystal; the extra Port E and PB-peripheral pins can be broken out on proprietary form factors for additional I/O.
Recommended
Home Appliance Control Panels
Appliance control panels benefit from the ATMEGA328PB-MBTVAO's 105C rating near cooktops, dryers, and dishwashers, where enclosure temperatures exceed commercial limits. The 16-bit timer generates PWM for triac-based heater or motor control, the dual I2C bus separates a capacitive-touch controller from an EEPROM for cycle storage, and the 10-bit ADC reads NTC thermistor dividers for multi-point temperature monitoring. picoPower modes support standby clock/timer display operation within appliance standby-power regulations, and the QFN-32 package's exposed pad provides solid grounding for EMI-heavy environments near mains switching circuitry.
Recommended
Motor Control Auxiliary Systems
As an auxiliary controller in motor-drive systems, the ATMEGA328PB-MBTVAO handles housekeeping tasks - fan supervision, fault logging, and communication - while a dedicated driver manages power stages. The dual SPI connects a rotary encoder interface and a monitoring ADC simultaneously, and the 16-bit timer PWM output adjusts driver reference levels. Its 105C rating matches enclosure conditions near drive electronics, and the hardware UART reports status over RS-485 through a transceiver. Because the MCU runs isolated from power stages via optocouplers, its 5 V domain remains robust against switching transients generated by the drive.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA328PB-MBTVAO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA328P-MU | ATMEGA328-MUR | ATMEGA168PB-MU |
|---|---|---|---|---|
| Package | 32-VFQFN (5x5 mm) | VQFN-32 (5x5 mm) - same | VQFN-32 (5x5 mm) - same | VQFN-32 (5x5 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Flash | 32 KB | 32 KB | 32 KB | 16 KB |
| SRAM | 4 KB | 2 KB | 2 KB | 1 KB |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Serial Peripherals | 2x USART, 2x I2C, 2x SPI | 1x USART, 1x I2C, 1x SPI | 1x USART, 1x I2C, 1x SPI | 2x USART, 1x I2C, 2x SPI (per PB family) |
| Operating Temperature | -40C to +105C (automotive) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) |
| AEC-Q100 Qualification | Yes (automotive, FuSa) | No (standard grade) | No (standard grade) | No (standard grade) |
Key Differentiators
- Doubled serial connectivity (vs ATMEGA328P-MU)
- Automotive qualification with 105C rating (vs ATMEGA328-MUR)
- Double program and SRAM versus 168PB (vs ATMEGA168PB-MU)
Design Notes
Migrating from ATmega328P to ATMEGA328PB is software-backward-compatible but not blindly pin-identical: the PB routes its second I2C, second SPI, and Port E functions to pins that do not exist on some 328P package pinouts. Before swapping on an existing QFN-32 PCB, run the Microchip migration application note checklist and verify that your firmware does not rely on 328P-only fuse defaults; community reports confirm code and fuse compatibility once hardware pins are accounted for.
Decouple each VCC pin (pins 4 and 6) and AVCC (pin 18) with 100 nF ceramic capacitors placed within 2 mm of the pin, plus one bulk 10 uF capacitor per supply rail. Tie AVCC to VCC through an LC filter (10 uH + 10 uF) when ADC accuracy matters, keeping the analog reference (AREF, pin 20) decoupled with 100 nF. Estimate: with 20 MHz operation at 5 V, active current is on the order of 10 mA per picoPower family characteristics - confirm against datasheet electrical characteristics.
The 32-pin VQFN 5x5 mm has an exposed die pad on the underside that must be soldered to a grounded thermal Via array (typically a 3x3 pattern of 0.3 mm vias) for reliable ground return and heat dissipation. Define the QFN footprint per the Microchip landing-pattern recommendation and inspect paste stencil thickness (100-125 um recommended) - insufficient pad solder on the exposed pad is the most common rework cause for QFN assemblies.
Compliance Information
Mouser listing describes the part as Green (RoHS-compliant, lead-free) and automotive AEC-Q100 with Functional Safety (FuSa) support. REACH and halogen-free status not stated in provided data.
