AT89C51RB2-3CSIM Equivalent & Substitute Parts

Part Overview

The AT89C51RB2-3CSIM is an 8-bit microcontroller from Microchip Technology's 89C series, featuring a 80C51 core processor with 16KB FLASH program memory and 1.25KB RAM. This device operates at 60MHz with integrated peripherals including SPI, UART/USART connectivity, POR, PWM, and WDT functionality across 32 I/O pins. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

AT89C51RB2-3CSIM

Microchip TechnologyIn Stock: 718AT89C51RB2-3CSIM Datasheet

Current PartRFQ

AT89C51RB2-3CSUM

Microchip TechnologyIn Stock: 1225AT89C51RB2-3CSUM Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT89C51RB2-3CSIM is determined by strict equivalence across the following critical parameters:

• Core Architecture: 80C51 processor core
• Memory Configuration: 16KB FLASH program memory, 1.25KB RAM
• Performance: 60MHz operating frequency
• I/O Count: 32 I/O pins
• Connectivity & Peripherals: SPI, UART/USART, POR, PWM, WDT
• Electrical Specifications: 2.7V ~ 5.5V supply voltage range, -40°C ~ 85°C operating temperature
• Physical Form Factor: 40-DIP package (0.600", 15.24mm)

The AT89C51RB2-3CSUM meets all substitution criteria as a direct equivalent, differing only in packaging format (Tube vs. unspecified) and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The AT89C51RB2-3CSUM is a direct functional equivalent to the AT89C51RB2-3CSIM. Both devices share identical core architecture, memory configuration, performance specifications, and physical packaging. The primary distinction lies in product lifecycle status and compliance certifications.

The AT89C51RB2-3CSIM is classified as obsolete, indicating discontinued manufacturing and limited availability. The AT89C51RB2-3CSUM maintains active product status with current manufacturing support.

From a compliance perspective, the AT89C51RB2-3CSUM provides superior environmental and regulatory positioning. It meets ROHS3 compliance requirements, whereas the AT89C51RB2-3CSIM is RoHS non-compliant. The substitute part also demonstrates improved moisture handling characteristics with MSL rating of 1 (Unlimited) compared to MSL 3 (168 Hours) for the main part.

Both devices carry identical ECCN (3A991A2) and HTSUS (8542.31.0001) classifications and maintain REACH Unaffected status.

Frequently Asked Questions (FAQ)

Q: Are AT89C51RB2-3CSIM and AT89C51RB2-3CSUM electrically interchangeable?

A: Yes. Both devices feature identical electrical specifications including 80C51 core processor, 16KB FLASH memory, 1.25KB RAM, 60MHz operation, 32 I/O pins, and 2.7V ~ 5.5V supply voltage range. They are pin-compatible in 40-DIP packaging.

Q: What is the significance of the product status difference?

A: The AT89C51RB2-3CSIM is obsolete, indicating end-of-life status with no ongoing manufacturing. The AT89C51RB2-3CSUM is active, ensuring continued availability and manufacturing support for new designs and system maintenance.

Q: How do RoHS compliance differences affect component selection?

A: The AT89C51RB2-3CSUM meets ROHS3 compliance standards, making it suitable for applications with environmental and regulatory requirements. The AT89C51RB2-3CSIM is RoHS non-compliant and may not meet modern procurement specifications for regulated industries.

Q: What does the MSL rating difference indicate?

A: MSL (Moisture Sensitivity Level) indicates moisture absorption risk during storage and handling. The AT89C51RB2-3CSUM with MSL 1 (Unlimited) has superior moisture resistance compared to AT89C51RB2-3CSIM with MSL 3 (168 Hours), reducing risk of component degradation in humid environments.

Q: Are there packaging format differences between these parts?

A: Both devices use identical 40-DIP (0.600", 15.24mm) physical packaging. The AT89C51RB2-3CSUM is supplied in Tube packaging format. Packaging format does not affect electrical or mechanical compatibility.

Q: Can I use AT89C51RB2-3CSUM as a direct replacement in existing designs?

A: Yes. The AT89C51RB2-3CSUM provides complete functional and physical compatibility with AT89C51RB2-3CSIM. No design modifications are required for component substitution.