AT80C31X2-3CSUL Equivalent & Substitute Parts

Part Overview

The AT80C31X2-3CSUL is an 8-bit ROMless microcontroller from the 80C series manufactured by Microchip Technology. This device operates at 30/20MHz with a 40-PDIL package and features 128 x 8 bytes of RAM, UART/USART connectivity, and Power-On Reset (POR) peripheral support. The part is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

AT80C31X2-3CSUL

Microchip TechnologyIn Stock: 748AT80C31X2-3CSUL Datasheet

Current PartRFQ

AT80C51RD2-3CSUM

Microchip TechnologyIn Stock: 1181AT80C51RD2-3CSUM Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT80C31X2-3CSUL is determined by the following critical parameters:

• Core Processor Architecture: Both parts must use the 80C51 core to ensure instruction set compatibility
• Program Memory Type: ROMless configuration must be maintained
• Package / Case: 40-DIP form factor ensures mechanical and pin compatibility
• Voltage Supply Range: 2.7V ~ 5.5V compatibility required for power supply interchangeability
• Number of I/O: 32 I/O pins must be preserved for circuit board integration
• Mounting Type: Through Hole mounting type must remain consistent
• Operating Temperature Range: -40°C ~ 85°C specification must be met or exceeded

The AT80C51RD2-3CSUM qualifies as a substitute based on matching all critical parameters while offering enhanced specifications in speed, RAM capacity, and peripheral integration.

Parameter Comparison

Engineering Selection Recommendations

The AT80C51RD2-3CSUM is a direct substitute for the AT80C31X2-3CSUL based on matching core architecture, package form factor, voltage specifications, and I/O configuration. The substitute part offers the following advantages:

• Active Product Status: The AT80C51RD2-3CSUM maintains active production status, ensuring long-term availability and supply chain continuity
• Enhanced Performance: Operating speed increased to 40MHz provides headroom for timing-critical applications
• Expanded Memory: RAM capacity increased from 128 x 8 to 1K x 8 bytes supports more complex firmware implementations
• Additional Peripherals: Integrated PWM and Watchdog Timer (WDT) functionality extends application capability
• Improved Moisture Handling: MSL rating of 1 (Unlimited) compared to MSL 3 (168 Hours) reduces moisture-related reliability concerns
• Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status

Frequently Asked Questions (FAQ)

Q: Can the AT80C51RD2-3CSUM be used as a direct replacement for the AT80C31X2-3CSUL?

A: Yes. Both parts share the 80C51 core processor, identical 40-DIP package dimensions, matching voltage supply range (2.7V ~ 5.5V), and equivalent I/O count (32 pins). Pin-to-pin compatibility is maintained, allowing direct socket substitution.

Q: What are the key differences between these two parts?

A: The AT80C51RD2-3CSUM operates at 40MHz versus the AT80C31X2-3CSUL's 30/20MHz, provides 1K x 8 RAM versus 128 x 8, includes PWM and Watchdog Timer peripherals, and maintains active product status versus obsolete classification.

Q: Are there any package or mounting considerations?

A: Both parts use identical 40-DIP (0.600", 15.24mm) packaging with Through Hole mounting. No PCB layout modifications are required for substitution.

Q: Do both parts operate within the same voltage range?

A: Yes. Both the AT80C31X2-3CSUL and AT80C51RD2-3CSUM operate across the 2.7V ~ 5.5V supply voltage range, ensuring compatibility with existing power supply designs.

Q: What is the significance of the MSL rating difference?

A: The AT80C51RD2-3CSUM has an MSL rating of 1 (Unlimited) compared to the AT80C31X2-3CSUL's MSL 3 (168 Hours). This indicates superior moisture resistance and reduced risk of moisture-induced failures during storage and handling.

Q: Are both parts RoHS compliant?

A: Yes. Both the AT80C31X2-3CSUL and AT80C51RD2-3CSUM are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.