T89C51RC2-SLSIM Equivalent & Substitute Parts

Part Overview

The T89C51RC2-SLSIM is an 80C51-based 8-bit microcontroller manufactured by Microchip Technology, featuring 32KB FLASH program memory, 1.2KB RAM, and 32 I/O pins in a 44-PLCC surface mount package. The device operates at 40MHz with a supply voltage range of 4.5V to 5.5V and includes integrated peripherals such as SPI, UART/USART, Power-On Reset (POR), Pulse Width Modulation (PWM), and Watchdog Timer (WDT).

This part is classified as obsolete. Locating equivalent or substitute components is necessary to support legacy system maintenance, design updates, or production continuity where original inventory is depleted.

Key Parameters

Parameter	Value
Core Processor	80C51
Core Size	8-Bit
Program Memory Type	FLASH
Program Memory Size	32KB (32K x 8)
RAM Size	1.2K x 8
Number of I/O	32
Connectivity	SPI, UART/USART
Peripherals	POR, PWM, WDT
Mounting Type	Surface Mount
Package / Case	44-LCC (J-Lead)
Supplier Device Package	44-PLCC (16.6x16.6)

Substitute Part Grouping Explanation

Substitution of the T89C51RC2-SLSIM is determined by strict compatibility across the following parameters:

Core Processor Architecture: Must be 80C51-compatible
Program Memory: Must be 32KB FLASH minimum
RAM Size: Must be 1.2KB or greater
I/O Count: Must provide 32 I/O pins
Package: Must be 44-PLCC (16.6x16.6) surface mount
Connectivity: Must include SPI and UART/USART
Peripherals: Must include POR, PWM, and WDT
Operating Temperature Range: Must support -40°C to 85°C

The AT89C51RC2-SLSUM meets all mandatory compatibility criteria and is classified as an equivalent substitute.

Parameter Comparison

Parameter	T89C51RC2-SLSIM (Main Part)	AT89C51RC2-SLSUM (Substitute)
Manufacturer	Microchip Technology	Microchip Technology
Core Processor	80C51	80C51
Core Size	8-Bit	8-Bit
Speed	40MHz	60MHz
Program Memory Size	32KB (32K x 8)	32KB (32K x 8)
Program Memory Type	FLASH	FLASH
RAM Size	1.2K x 8	1.25K x 8
Number of I/O	32	32
Connectivity	SPI, UART/USART	SPI, UART/USART
Peripherals	POR, PWM, WDT	POR, PWM, WDT
Voltage - Supply (Vcc/Vdd)	4.5V ~ 5.5V	2.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	44-LCC (J-Lead)	44-LCC (J-Lead)
Supplier Device Package	44-PLCC (16.6x16.6)	44-PLCC (16.6x16.6)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)	3 (168 Hours)

Engineering Selection Recommendations

The AT89C51RC2-SLSUM is a direct functional equivalent to the T89C51RC2-SLSIM. Both devices share identical core architecture, memory configuration, I/O count, and peripheral set. The substitute part offers the following advantages:

Product Status: The AT89C51RC2-SLSUM is classified as Active, ensuring continued availability and manufacturing support, whereas the main part is Obsolete.
RoHS Compliance: The substitute meets ROHS3 compliance standards, whereas the main part is non-compliant.
Performance Headroom: The substitute operates at 60MHz versus 40MHz, providing additional processing capability without architectural changes.
Supply Voltage Range: The substitute accepts 2.7V to 5.5V, offering broader voltage compatibility compared to the main part's 4.5V to 5.5V range.
RAM Capacity: The substitute provides 1.25K x 8 RAM versus 1.2K x 8, offering marginally increased memory.

Selection of the AT89C51RC2-SLSUM is appropriate for new designs, production continuity, and legacy system updates where regulatory compliance and long-term availability are required.

Frequently Asked Questions (FAQ)

Q: Can the AT89C51RC2-SLSUM replace the T89C51RC2-SLSIM in existing designs?

A: Yes. Both devices are 80C51-compatible with identical program memory (32KB FLASH), RAM (1.2KB minimum), I/O count (32), package (44-PLCC), and peripheral configuration (SPI, UART/USART, POR, PWM, WDT). The substitute operates at higher speed (60MHz vs. 40MHz) and supports a wider supply voltage range (2.7V to 5.5V vs. 4.5V to 5.5V), making it functionally compatible without design modification.

Q: Are there package compatibility concerns?

A: No. Both parts use identical 44-PLCC (16.6x16.6) surface mount packaging with 44-LCC J-Lead configuration. PCB footprints and assembly processes are interchangeable.

Q: What is the significance of the RoHS compliance difference?

A: The main part (T89C51RC2-SLSIM) is RoHS non-compliant, while the substitute (AT89C51RC2-SLSUM) is ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, the substitute is the appropriate choice.

Q: Does the higher operating speed of the substitute affect compatibility?

A: No. The substitute's 60MHz operation is backward-compatible with designs specified for 40MHz. The higher speed provides performance headroom and does not introduce incompatibility. Existing firmware and timing-critical code will function correctly.

Q: What is the difference in Moisture Sensitivity Level (MSL)?

A: The main part has MSL 2 (1 Year shelf life), while the substitute has MSL 3 (168 Hours shelf life). This affects storage and handling procedures. MSL 3 components require more stringent moisture control during storage and assembly.

Q: Is the substitute available in the same packaging format?

A: Yes. The AT89C51RC2-SLSUM is supplied in Tube packaging, while the main part packaging is not specified. Both use identical 44-PLCC (16.6x16.6) component packaging suitable for surface mount assembly.

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