ATMEGA324A-MUR Equivalent & Substitute Parts

Part Overview

The ATMEGA324A-MUR is an 8-bit AVR microcontroller from Microchip Technology's ATmega series, featuring 32KB FLASH program memory, 2KB RAM, and 1KB EEPROM. This device operates at 20MHz with integrated peripherals including I2C, SPI, and UART/USART connectivity, along with brown-out detection, power-on reset, PWM, and watchdog timer functionality. The part is actively produced and widely used in embedded applications requiring moderate processing capability with low power consumption across industrial and commercial temperature ranges. Identifying equivalent substitute parts is essential for supply chain continuity, inventory optimization, and design flexibility when the primary part number becomes unavailable or when alternative packaging options are required.

Substiute Parts

ATMEGA324A-MUR

Microchip TechnologyIn Stock: 895ATMEGA324A-MUR Datasheet

Current PartRFQ

ATMEGA324PA-MUR

Microchip TechnologyIn Stock: 8343ATMEGA324PA-MUR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ATMEGA324A-MUR are determined by strict equivalence across all critical electrical and mechanical parameters. The substitution logic is based on the following key criteria:

Electrical Equivalence: Core processor architecture (AVR), core size (8-Bit), clock speed (20MHz), memory configuration (32KB FLASH, 2KB RAM, 1KB EEPROM), I/O count (32 pins), voltage supply range (1.8V ~ 5.5V), integrated peripherals (I2C, SPI, UART/USART, brown-out detection, POR, PWM, WDT), and analog-to-digital converter specifications (8x10-bit) must remain identical.

Mechanical Equivalence: Package type (44-VFQFN Exposed Pad), mounting method (Surface Mount), and physical dimensions (7x7mm) must match exactly to ensure PCB compatibility without layout modifications.

Compliance Equivalence: RoHS3 compliance, moisture sensitivity level (MSL 3), and regulatory classifications (ECCN, HTSUS) must be maintained.

Product Status: Only active, currently manufactured parts qualify as substitutes. Obsolete or end-of-life parts are excluded.

The ATMEGA324PA-MUR meets all substitution criteria and is classified as a parametric equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both the ATMEGA324A-MUR and ATMEGA324PA-MUR are active products manufactured by Microchip Technology and maintain full compliance with ROHS3 and REACH regulations. The parts are electrically and mechanically identical across all functional parameters, memory configurations, peripheral sets, and operating specifications.

The primary distinction between these parts is packaging format. The ATMEGA324A-MUR is supplied in Tape & Reel (TR) format, while the ATMEGA324PA-MUR is available in Cut Tape (CT) and Digi-Reel® formats. Selection between these options depends on procurement volume requirements and assembly line compatibility. Both packaging formats contain the identical die and are suitable for automated pick-and-place assembly processes.

Inventory availability should be considered in component selection. The ATMEGA324PA-MUR currently maintains higher stock levels (8300 pcs) compared to the ATMEGA324A-MUR (823 pcs), which may influence lead time and supply chain planning decisions.

Frequently Asked Questions (FAQ)

Q: Are ATMEGA324A-MUR and ATMEGA324PA-MUR pin-for-pin compatible?

A: Yes. Both parts use the 44-VFQFN Exposed Pad package with identical pinout, voltage specifications, and functional I/O assignments. Direct substitution on the PCB is possible without layout modifications.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on continuous carrier tape wound on reels, optimized for high-volume automated assembly. Cut Tape (CT) and Digi-Reel® packaging provide smaller quantities on cut tape segments, suitable for lower-volume production or prototyping. Both formats contain identical components and are compatible with standard pick-and-place equipment.

Q: Can I use ATMEGA324PA-MUR as a direct replacement for ATMEGA324A-MUR in production?

A: Yes. The parts are parametric equivalents with identical electrical specifications, memory configurations, peripheral sets, and operating ranges. No firmware, schematic, or PCB modifications are required for substitution.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both parts maintain identical RoHS3 compliance, REACH status, ECCN classification (EAR99), and HTSUS codes. Regulatory and environmental certifications are equivalent.

Q: What is the moisture sensitivity level, and how does it affect handling?

A: Both parts carry MSL 3 rating with a 168-hour floor life. This indicates standard moisture sensitivity requiring storage in dry conditions and adherence to standard moisture control procedures during assembly. No special handling beyond industry-standard practices is necessary.

Q: Are both parts actively manufactured?

A: Yes. Both ATMEGA324A-MUR and ATMEGA324PA-MUR maintain active product status with Microchip Technology and are currently in production.