ATMEGA324PB-MBTES Microchip Integrated Circuit (Quad Flat No-Lead) In Stock
Microchip ATMEGA324PB-MBTES is an 8-bit AVR RISC microcontroller running up to 16 MHz with 32 KB flash, 2 KB SRAM, and rich peripherals including ADC, UART, SPI, I2C, and PWM timers in a compact QFN package. The ATmega324PB adds enhanced peripheral sets and two additional UART and TWI interfaces compared to the ATmega324P, making it ideal for connectivity-rich embedded designs. Available in moisture-barrier tape-and-reel packaging with worldwide shipping for industrial and consumer production.
- Manufacturer
- Microchip
- Package
- Quad Flat No-Lead
- Pin Count
- 45
- Lifecycle
- ACTIVE
- Datasheet
- ATMEGA324PB-MBTES Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 105.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8-bit AVR RISC core running up to 16 MHz with 32 KB in-system programmable flash and 2 KB SRAM for code-intensive embedded applications
- Enhanced peripheral set including 2x UART, 3x SPI, 2x TWI (I2C), and up to 8-channel 10-bit ADC versus the ATmega324P baseline
- Boundary scan (JTAG) support enables in-circuit debugging and testing without removing the QFN device from the PCB
- Compact QFN package reduces PCB footprint compared to TQFP alternatives while maintaining full 32 I/O pin accessibility
Applications
The ATMEGA324PB-MBTES is suited for industrial sensor nodes, home automation controllers, and motor-drive applications that require multiple serial communication interfaces and a capable 10-bit ADC within a single low-power 8-bit microcontroller. Its dual UART and enhanced TWI peripherals make it well-matched to embedded gateways that bridge RS-232/RS-485 sensor buses with I2C peripheral networks, a common requirement in building automation and HVAC control units. The 16 MHz AVR core with boundary-scan capability also suits firmware development boards and automated in-circuit testing environments where JTAG access to all I/O is needed during production validation.
Specifications
| Date Of Intro | 2017-05-31 |
| YTEOL | 7.2 |
| Has ADC | YES |
| Bit Size | 8 |
| Boundary Scan | YES |
| CPU Family | AVR RISC |
| Clock Frequency-Max | 16MHz |
| DAC Channels | NO |
| DMA Channels | NO |
| Format | FIXED POINT |
| Integrated Cache | NO |
| JESD-30 Code | S-XQCC-N44 |
| Low Power Mode | YES |
| Number of I/O Lines | 39 |
| Number of Timers | 5 |
| On Chip Data RAM Width | 8 |
| On Chip Program ROM Width | 16 |
| PWM Channels | YES |
| Package Body Material | UNSPECIFIED |
| Package Equivalence Code | LCC44,.28SQ,20 |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| RAM (bytes) | 2048 |
| RAM (words) | 1024 |
| ROM (words) | 16384 |
| ROM Programmability | FLASH |
| Screening Level | AEC-Q100; TS 16949 |
| Speed | 16MHz |
| Supply Current-Max | 8mA |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 2.7V |
| Supply Voltage-Nom | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| Time-Min | SECONDS |
| uPs/uCs/Peripheral ICs Type | MICROCONTROLLER, RISC |
| ## ATMEGA324PB-MBTES Alternates Showing results | Image |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.31.00.01 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for ATMEGA324PB-MBTES:
RISC Microcontroller, 8-Bit, FLASH, AVR RISC CPU, 20MHz, CMOS, PQCC44
Frequently Asked Questions
How does the ATMEGA324PB-MBTES differ from the ATmega324P in peripheral count, and why does this matter for multi-bus embedded designs?
The ATMEGA324PB-MBTES provides 2 UART channels, 3 SPI interfaces, and 2 TWI (I2C) interfaces compared to the ATmega324P which offers only 1 UART, 1 SPI, and 1 TWI. This doubles the serial communication bandwidth available to firmware without requiring external UART or I2C expander ICs, saving at least 2 components and reducing BOM cost in designs that bridge multiple sensor buses. The 8-bit AVR core, 16 MHz clock, and 32 KB flash remain identical between the two variants, so the 324PB is a near pin-compatible upgrade path.
What ADC capability does the ATMEGA324PB-MBTES provide, and which sensor interface applications benefit most?
The ATMEGA324PB-MBTES includes an 8-channel 10-bit successive-approximation ADC with a sample rate up to approximately 76.9 kSPS at 16 MHz clock. This 10-bit resolution provides 1024 discrete levels per channel, suitable for reading thermistors, pressure sensors, potentiometers, and light sensors with measurement accuracy of roughly 0.1% full-scale. Applications such as HVAC temperature controllers, liquid-level monitors, and industrial 4-20 mA loop receivers benefit from this ADC by directly digitising analogue transducer outputs without an external ADC IC.
What does the QFN package of the ATMEGA324PB-MBTES offer in terms of PCB footprint versus a TQFP package option?
The QFN (Quad Flat No-Lead) package of the ATMEGA324PB-MBTES occupies a smaller PCB area than an equivalent TQFP package because the leads are flush with the package body rather than extending outward as gull-wing pins. A 32-pin QFN typically measures 5 mm x 5 mm compared to a 44-pin TQFP that is 10 mm x 10 mm, saving 75 mm² of PCB area. The exposed thermal pad on the QFN bottom also improves heat dissipation into the PCB copper, lowering the junction temperature when the AVR core is running at full 16 MHz throughput.
Why does boundary scan (JTAG) support in the ATMEGA324PB-MBTES simplify production testing on a densely populated PCB?
Boundary scan via JTAG allows automated test equipment to read and drive each of the 32 I/O pins of the ATMEGA324PB-MBTES directly through the 4-wire JTAG port without physical probing of individual pads, which is impractical on fine-pitch QFN boards with 0.5 mm pad pitch. During production testing, a boundary-scan test pattern can verify open and shorted solder joints on the microcontroller and adjacent passive components in seconds, reducing test fixture cost and fault-isolation time from minutes to seconds. JTAG also supports in-circuit programming of the 32 KB flash via AVR JTAG-compatible programmers such as the MPLAB PICkit or Atmel-ICE.
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