AT89C51AC3-SLSIM Equivalent & Substitute Parts

Part Overview

The AT89C51AC3-SLSIM is an 8-bit microcontroller from Microchip Technology's 89C series, featuring 64KB FLASH program memory, 2.25KB RAM, and 2KB EEPROM. This device implements the 80C51 core architecture with a 60MHz operating frequency and integrates UART/USART connectivity alongside peripheral functions including Power-On Reset (POR), Pulse Width Modulation (PWM), and Watchdog Timer (WDT). The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

AT89C51AC3-SLSIM

Microchip TechnologyIn Stock: 1024AT89C51AC3-SLSIM Datasheet

Current PartRFQ

AT89C51AC3-SLSUM

Microchip TechnologyIn Stock: 2556AT89C51AC3-SLSUM Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT89C51AC3-SLSIM is determined by strict equivalence across the following critical parameters:

• Core Architecture: 80C51 processor core
• Memory Configuration: 64KB FLASH program memory, 2.25KB RAM, 2KB EEPROM
• Operating Frequency: 60MHz
• Supply Voltage Range: 3V ~ 5.5V
• I/O Count: 36 pins
• Peripheral Set: UART/USART, POR, PWM, WDT
• Package Format: 44-PLCC (16.6x16.6) with 44-LCC J-Lead configuration
• Data Conversion: 8-channel 10-bit A/D converter

The AT89C51AC3-SLSUM meets all these criteria and is therefore classified as a direct functional equivalent.

Parameter Comparison

Engineering Selection Recommendations

The AT89C51AC3-SLSUM is the direct substitute for the obsolete AT89C51AC3-SLSIM. Both devices share identical electrical specifications, memory architecture, peripheral configuration, and package format, ensuring pin-for-pin and functional compatibility.

The AT89C51AC3-SLSUM offers the following advantages:

• Product Status: Active production status ensures long-term availability and supply chain continuity
• Regulatory Compliance: ROHS3 compliant, meeting current environmental and hazardous substance restrictions
• Certification Alignment: Identical ECCN and HTSUS classifications confirm regulatory equivalence

The AT89C51AC3-SLSUM is suitable for direct replacement in applications currently using the AT89C51AC3-SLSIM without circuit modification or firmware changes.

Frequently Asked Questions (FAQ)

Q: Are the AT89C51AC3-SLSIM and AT89C51AC3-SLSUM pin-compatible?

A: Yes. Both devices use the 44-PLCC (16.6x16.6) package with 44-LCC J-Lead configuration. Pin assignments, electrical characteristics, and functional behavior are identical.

Q: What is the difference between these two part numbers?

A: The primary differences are product status and regulatory compliance. The AT89C51AC3-SLSIM is obsolete and RoHS non-compliant, while the AT89C51AC3-SLSUM is in active production and ROHS3 compliant. All electrical and functional parameters are equivalent.

Q: Can I use the AT89C51AC3-SLSUM as a direct replacement on existing PCBs?

A: Yes. The AT89C51AC3-SLSUM is a direct functional and physical replacement. No PCB modifications, firmware changes, or design alterations are required.

Q: Are there any differences in memory specifications?

A: No. Both devices feature identical memory configurations: 64KB FLASH program memory, 2.25KB RAM, and 2KB EEPROM.

Q: What is the significance of the different Moisture Sensitivity Levels (MSL)?

A: The AT89C51AC3-SLSIM has MSL 2 (1 Year shelf life), while the AT89C51AC3-SLSUM has MSL 3 (168 Hours shelf life). This affects storage and handling procedures but does not impact functional performance or electrical characteristics.

Q: Are the supply voltage ranges identical?

A: Yes. Both devices operate across the same supply voltage range of 3V to 5.5V (Vcc/Vdd).

Q: Do both parts support the same operating temperature range?

A: Yes. Both devices operate across -40°C to 85°C (TA).