AT91M40800-33AI Equivalent & Substitute Parts

Part Overview

The AT91M40800-33AI is an ARM7® 16/32-bit microcontroller from Microchip Technology's AT91 series, operating at 33MHz with ROMless architecture. This device is classified as obsolete, making identification of compatible substitutes essential for ongoing system support, maintenance, and new design implementations where legacy compatibility is required. The ROMless configuration necessitates external program memory, distinguishing this device from ROM-equipped variants within the AT91 family.

Substiute Parts

AT91M40800-33AI

Microchip TechnologyIn Stock: 2084AT91M40800-33AI Datasheet

Current PartRFQ

AT91M40800-33AU

Microchip TechnologyIn Stock: 16172AT91M40800-33AU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT91M40800-33AI is determined by strict equivalence across the following critical parameters:

• Manufacturer & Series: Microchip Technology AT91 series
• Core Architecture: ARM7® 16/32-bit processor
• Operating Frequency: 33MHz
• Memory Configuration: ROMless architecture with 8K x 8 RAM
• Electrical Specifications: 1.8V ~ 3.6V supply voltage range
• I/O Count: 32 I/O pins
• Connectivity Interfaces: EBI/EMI and UART/USART support
• Package Format: 100-LQFP (14x14) surface mount
• Temperature Range: -40°C ~ 85°C

The AT91M40800-33AU qualifies as a direct substitute based on identical electrical, functional, and mechanical specifications. The primary distinction lies in packaging format (tray versus tape) and product status (active versus obsolete).

Parameter Comparison

Engineering Selection Recommendations

The AT91M40800-33AU is a direct functional equivalent to the AT91M40800-33AI. Selection between these parts should be based on the following criteria:

For New Designs or Active Production: The AT91M40800-33AU is the appropriate choice. This part carries active product status from Microchip Technology and meets ROHS3 compliance requirements, aligning with current environmental and regulatory standards. Tray packaging is suitable for automated assembly processes.

For Legacy System Maintenance: The AT91M40800-33AI remains viable for repair and maintenance of existing systems where the original part specification is required. However, availability is limited (2015 units in stock versus 16067 units for the -33AU variant).

Compliance Considerations: The AT91M40800-33AU's ROHS3 compliance status provides regulatory advantage for applications subject to environmental directives. The AT91M40800-33AI's RoHS non-compliant status may present restrictions in certain jurisdictions or procurement environments.

Packaging Impact: Tape packaging (AT91M40800-33AI) is standard for manual handling and lower-volume applications. Tray packaging (AT91M40800-33AU) is optimized for high-speed automated pick-and-place assembly.

Frequently Asked Questions (FAQ)

Q: Can the AT91M40800-33AU replace the AT91M40800-33AI in existing designs?

A: Yes. Both parts are electrically and functionally identical across all critical parameters: ARM7® core architecture, 33MHz operation, ROMless configuration, 8K x 8 RAM, 32 I/O pins, 100-LQFP package, and -40°C to 85°C temperature range. The substitution is direct at the functional level.

Q: What is the difference between tape and tray packaging?

A: Tape packaging (AT91M40800-33AI) presents components in continuous carrier tape, suitable for manual component handling and lower-volume assembly. Tray packaging (AT91M40800-33AU) organizes components in static-dissipative trays, optimized for automated high-speed assembly equipment. Both formats contain identical components.

Q: Does RoHS compliance affect functional compatibility?

A: No. RoHS compliance relates to material composition and environmental standards, not electrical or functional performance. Both parts operate identically within their specified parameters. ROHS3 compliance of the AT91M40800-33AU indicates adherence to current environmental directives.

Q: Are there any pin-to-pin differences between these parts?

A: No. Both parts use the 100-LQFP (14x14) package with identical pinout, I/O configuration, and electrical characteristics. PCB layout and schematic designs are directly compatible.

Q: Why is the AT91M40800-33AI classified as obsolete?

A: Microchip Technology has transitioned this product line to active status under the AT91M40800-33AU designation. The obsolete classification reflects the manufacturer's product lifecycle management and does not indicate functional deficiency.

Q: Which part should be selected for new production?

A: The AT91M40800-33AU is the recommended selection for new designs and active production. This part maintains active product status, meets current compliance standards (ROHS3), and has significantly higher inventory availability (16067 units versus 2015 units).