AT91M42800A-33AI Equivalent & Substitute Parts

Part Overview

The AT91M42800A-33AI is an ARM7® 16/32-bit microcontroller from Microchip Technology's AT91 series, operating at 33MHz with ROMless architecture. This device integrates 8K x 8 RAM, 54 I/O pins, and core peripherals including UART/USART, SPI, and watchdog timer functionality in a 144-LQFP surface mount package. The part is classified as obsolete, making identification of active equivalent substitutes essential for ongoing design support and procurement continuity.

Substiute Parts

AT91M42800A-33AI

Microchip TechnologyIn Stock: 1054AT91M42800A-33AI Datasheet

Current PartRFQ

AT91M42800A-33AU

Microchip TechnologyIn Stock: 2172AT91M42800A-33AU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT91M42800A-33AI is determined by strict alignment across the following critical parameters:

• Core Architecture: ARM7® 16/32-bit processor
• Operating Frequency: 33MHz
• Memory Configuration: ROMless with 8K x 8 RAM
• I/O Count: 54 pins
• Package Format: 144-LQFP (20x20) surface mount
• Voltage Range: 2.7V ~ 3.6V
• Temperature Range: -40°C ~ 85°C
• Connectivity Interfaces: EBI/EMI, SPI, UART/USART
• Peripheral Set: Watchdog Timer

The AT91M42800A-33AU qualifies as a direct substitute based on identical electrical specifications, core architecture, memory configuration, I/O count, package format, and operating conditions. Differences in oscillator type (internal vs. external) and product status do not affect functional substitutability in applications where external oscillator configuration is available.

Parameter Comparison

Engineering Selection Recommendations

The AT91M42800A-33AU is the active equivalent for the obsolete AT91M42800A-33AI. Selection between these parts should be based on the following factors:

Product Status: The AT91M42800A-33AU carries Active status with confirmed inventory availability (2100 pcs), whereas the AT91M42800A-33AI is classified as Obsolete. For new designs or long-term production requirements, the AT91M42800A-33AU is the appropriate choice.

Compliance Posture: The AT91M42800A-33AU meets ROHS3 compliance requirements, while the AT91M42800A-33AI is RoHS non-compliant. Applications subject to RoHS directives or customer compliance mandates require the AT91M42800A-33AU.

Oscillator Configuration: The AT91M42800A-33AI integrates an internal oscillator, while the AT91M42800A-33AU requires external oscillator configuration. Design implementations must accommodate external oscillator circuitry when transitioning to the substitute part.

Electrical and Functional Equivalence: Both parts maintain identical core specifications across processor architecture, clock frequency, memory configuration, I/O count, voltage range, temperature range, and peripheral set. Pin-for-pin compatibility and functional behavior are preserved.

Frequently Asked Questions (FAQ)

Q: Are the AT91M42800A-33AI and AT91M42800A-33AU pin-compatible?

A: Yes. Both devices use the 144-LQFP (20x20) package with identical pin assignments, I/O count (54 pins), and functional connectivity (EBI/EMI, SPI, UART/USART). Direct socket substitution is supported.

Q: What is the primary difference between these two parts?

A: The AT91M42800A-33AU features external oscillator configuration, whereas the AT91M42800A-33AI integrates an internal oscillator. Additionally, the AT91M42800A-33AU is Active status with ROHS3 compliance, while the AT91M42800A-33AI is Obsolete and RoHS non-compliant.

Q: Can I use the AT91M42800A-33AU as a direct replacement in existing designs?

A: Yes, provided your PCB design accommodates external oscillator circuitry. The electrical specifications, memory configuration, I/O functionality, and thermal operating range are identical. Oscillator circuit modifications are required.

Q: What are the inventory implications of this substitution?

A: The AT91M42800A-33AI has 1009 pcs available (Obsolete status). The AT91M42800A-33AU has 2100 pcs available (Active status). For production continuity, the AT91M42800A-33AU is the recommended choice.

Q: Are there any compliance considerations for this substitution?

A: Yes. The AT91M42800A-33AU is ROHS3 compliant and REACH unaffected. The AT91M42800A-33AI is RoHS non-compliant. Applications requiring RoHS compliance must use the AT91M42800A-33AU.

Q: Do both parts operate within the same voltage and temperature ranges?

A: Yes. Both parts operate at 2.7V ~ 3.6V supply voltage and -40°C ~ 85°C operating temperature range. Electrical stress conditions and thermal management requirements are equivalent.