ATMEGA328P-MMH Equivalent & Substitute Parts

Part Overview

The ATMEGA328P-MMH is an 8-bit AVR microcontroller manufactured by Microchip Technology, designed for embedded applications requiring moderate processing capability and integrated peripherals. This device features 32KB of FLASH program memory, 2KB of RAM, and 1KB of EEPROM, operating across a wide voltage range of 1.8V to 5.5V. The part is currently in active production status with 1888 units available in new original stock. Identifying equivalent and substitute parts is essential for supply chain continuity, design flexibility, and procurement optimization when the primary part number becomes unavailable or when alternative sourcing is required.

Substiute Parts

ATMEGA328P-MMH

Microchip TechnologyIn Stock: 1928ATMEGA328P-MMH Datasheet

Current PartRFQ

ATMEGA328-MMH

Microchip TechnologyIn Stock: 2361ATMEGA328-MMH Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ATMEGA328P-MMH is determined by strict equivalence across the following critical parameters:

Core Functional Parameters: The substitute part must maintain identical core processor architecture (AVR), core size (8-Bit), and operating speed (20MHz) to ensure software compatibility and performance characteristics.

Memory Configuration: Program memory capacity (32KB FLASH), RAM size (2K x 8), and EEPROM size (1K x 8) must be identical to preserve application code and data storage requirements.

Electrical Specifications: Voltage supply range (1.8V ~ 5.5V), number of I/O pins (23), and connectivity interfaces (I2C, SPI, UART/USART) must match exactly to ensure circuit-level compatibility.

Physical and Environmental Requirements: Package type (28-VFQFN Exposed Pad), mounting type (Surface Mount), operating temperature range (-40°C ~ 85°C), and compliance certifications (ROHS3, REACH Unaffected) must be identical.

Regulatory Compliance: RoHS3 compliance and REACH unaffected status must be maintained to meet procurement and environmental standards.

Parameter Comparison

Engineering Selection Recommendations

The ATMEGA328-MMH qualifies as a parametric equivalent to the ATMEGA328P-MMH based on complete alignment across all specified electrical, functional, and physical parameters. Both parts are manufactured by Microchip Technology, maintain identical core architecture and memory configurations, and operate within the same voltage and temperature specifications. Both parts carry active product status and maintain ROHS3 compliance with identical moisture sensitivity ratings.

Selection between these parts should be based on availability and supply chain requirements. The ATMEGA328-MMH currently has 2300 units in stock compared to 1888 units for the ATMEGA328P-MMH, providing additional procurement flexibility. Both parts are suitable for direct substitution in applications where the ATMEGA328P-MMH is specified, provided that the design does not rely on part-number-specific documentation or firmware that explicitly references the "P" variant designation.

Frequently Asked Questions (FAQ)

Q: What is the difference between ATMEGA328P-MMH and ATMEGA328-MMH?

A: Based on the provided specifications, both parts are parametrically equivalent across all electrical, functional, and physical parameters. The primary distinction is the "P" designation in the part number, which does not result in measurable differences in the specified parameters. Both parts feature identical 8-bit AVR architecture, 32KB FLASH memory, 20MHz operation, and 28-VQFN packaging.

Q: Can ATMEGA328-MMH be used as a direct replacement for ATMEGA328P-MMH in existing designs?

A: Yes. The ATMEGA328-MMH is a parametric equivalent with identical core processor, memory configuration, voltage supply range, I/O count, connectivity interfaces, and package specifications. Direct substitution is supported at the circuit and firmware level.

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

A: No. Both parts maintain identical RoHS3 compliance status, REACH unaffected designation, and moisture sensitivity level (MSL 3, 168 hours). Regulatory and environmental compliance requirements are equivalent.

Q: What packaging considerations apply to both parts?

A: Both parts use 28-VFQFN Exposed Pad surface mount packaging with 4x4mm dimensions. PCB footprints, reflow profiles, and handling procedures are identical. Moisture sensitivity level 3 applies to both parts, requiring storage in controlled humidity environments.

Q: Which part should be selected for new designs?

A: Selection should be based on current availability and supply chain strategy. The ATMEGA328-MMH currently has higher inventory (2300 units) compared to the ATMEGA328P-MMH (1888 units). Both parts are active products suitable for new designs with equivalent long-term availability expectations.