ATMEGA645-16MU Equivalent & Substitute Parts

Part Overview

The ATMEGA645-16MU is an 8-bit AVR microcontroller manufactured by Microchip Technology, designed for embedded applications requiring 64KB of Flash memory and 16MHz operation. This device is currently in active production status with verified programmability through DiGi-Electronics. Finding equivalent and substitute parts is necessary to ensure design flexibility, manage supply chain continuity, and accommodate packaging or inventory preferences while maintaining functional compatibility.

Substiute Parts

ATMEGA645-16MU

Microchip TechnologyIn Stock: 2278ATMEGA645-16MU Datasheet

Current PartRFQ

ATMEGA649-16MUR

Microchip TechnologyIn Stock: 3128ATMEGA649-16MUR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ATMEGA645-16MU is determined by strict equivalence across the following critical parameters:

• Core processor architecture (AVR)
• Core size (8-Bit)
• Operating frequency (16MHz)
• Program memory capacity (64KB FLASH)
• EEPROM and RAM sizes (2K x 8 and 4K x 8 respectively)
• Supply voltage range (2.7V ~ 5.5V)
• Analog-to-digital converter specification (A/D 8x10b)
• I/O pin count (53)
• Package type (64-VFQFN Exposed Pad)
• Operating temperature range (-40°C ~ 85°C)
• Compliance certifications (ROHS3, REACH Unaffected)

The ATMEGA649-16MUR qualifies as a manufacturer-recommended substitute based on matching all critical electrical and mechanical parameters. Differences in peripheral features (such as LCD support in the substitute) do not affect core substitutability when these parameters align.

Parameter Comparison

Engineering Selection Recommendations

Both the ATMEGA645-16MU and ATMEGA649-16MUR are active production devices from Microchip Technology with full ROHS3 compliance and REACH unaffected status. Selection between these parts should be based on:

• Packaging format availability: ATMEGA645-16MU is supplied in standard packaging, while ATMEGA649-16MUR is available in Cut Tape (CT) and Digi-Reel® formats
• Inventory requirements: ATMEGA649-16MUR currently has higher stock availability (3094 Pcs vs 2200 Pcs)
• Peripheral feature requirements: ATMEGA649-16MUR includes LCD controller support, which may be beneficial for applications requiring display interfacing

Both devices maintain identical electrical specifications, memory configurations, and thermal operating ranges, ensuring functional interchangeability in designs meeting the specified parameters.

Frequently Asked Questions (FAQ)

Q: Can ATMEGA649-16MUR be used as a direct replacement for ATMEGA645-16MU?

A: Yes. Both devices share identical core processor architecture, memory capacity, operating frequency, supply voltage range, I/O count, and package specifications. The ATMEGA649-16MUR is manufacturer-recommended as a substitute.

Q: What is the difference between these two parts?

A: The primary difference is the inclusion of an LCD controller in the ATMEGA649-16MUR. Both parts maintain identical Flash memory (64KB), EEPROM (2K x 8), RAM (4K x 8), and all electrical operating parameters.

Q: Are the packages identical?

A: Yes. Both parts use the 64-VFQFN Exposed Pad package with identical pinout and mechanical dimensions (9x9mm).

Q: Do these parts have the same operating temperature range?

A: Yes. Both devices operate across -40°C to 85°C (TA), meeting identical thermal specifications.

Q: Are there any compliance differences?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical regulatory certifications (ECCN: EAR99, HTSUS: 8542.31.0001).

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: Both parts have MSL 3 (168 Hours), requiring identical moisture handling and storage protocols.