T89C51AC2-RLTIM Equivalent & Substitute Parts

Part Overview

The T89C51AC2-RLTIM is an 8-bit microcontroller from the 80C51/89C series manufactured by Microchip Technology. This device integrates 32KB of FLASH program memory, 1.25KB of RAM, and 2KB of EEPROM, operating at 40MHz with a supply voltage range of 3V to 5.5V. The microcontroller features 34 I/O pins, UART/USART connectivity, and integrated peripherals including Power-On Reset (POR), Pulse Width Modulation (PWM), and Watchdog Timer (WDT).

The T89C51AC2-RLTIM is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure continued design support, maintain supply chain reliability, and access components with active product status and current compliance certifications.

Key Parameters

Parameter	Value
Core Processor	80C51
Core Size	8-Bit
Speed	40MHz
Program Memory Size	32KB (32K x 8)
Program Memory Type	FLASH
EEPROM Size	2K x 8
RAM Size	1.25K x 8
Voltage - Supply (Vcc/Vdd)	3V ~ 5.5V
Number of I/O	34
Data Converters	A/D 8x10b
Connectivity	UART/USART
Peripherals	POR, PWM, WDT
Mounting Type	Surface Mount
Package / Case	44-LQFP
Operating Temperature	-40°C ~ 85°C (TA)

Substitute Part Grouping Explanation

Substitution of the T89C51AC2-RLTIM is determined by strict equivalence across the following critical parameters:

Core Processor Architecture: 80C51 instruction set compatibility
Memory Configuration: 32KB FLASH program memory, 2KB EEPROM, 1.25KB RAM
Operating Frequency: 40MHz maximum clock speed
Supply Voltage Range: 3V to 5.5V operation
I/O Count: 34 I/O pins
Peripheral Set: UART/USART, POR, PWM, WDT
Package Type: 44-LQFP (44-VQFP 10x10mm)
Temperature Range: -40°C to 85°C

The AT89C51AC2T-RLTUM meets all these parameters identically. The primary distinction is product status: the T89C51AC2-RLTIM is obsolete, while the AT89C51AC2T-RLTUM maintains active product status with current RoHS3 compliance certification.

Parameter Comparison

Parameter	T89C51AC2-RLTIM (Main)	AT89C51AC2T-RLTUM (Substitute)
Manufacturer	Microchip Technology	Microchip Technology
Core Processor	80C51	80C51
Core Size	8-Bit	8-Bit
Speed	40MHz	40MHz
Program Memory Size	32KB (32K x 8)	32KB (32K x 8)
Program Memory Type	FLASH	FLASH
EEPROM Size	2K x 8	2K x 8
RAM Size	1.25K x 8	1.25K x 8
Voltage - Supply (Vcc/Vdd)	3V ~ 5.5V	3V ~ 5.5V
Number of I/O	34	34
Data Converters	A/D 8x10b	A/D 8x10b
Connectivity	UART/USART	UART/USART
Peripherals	POR, PWM, WDT	POR, PWM, WDT
Mounting Type	Surface Mount	Surface Mount
Package / Case	44-LQFP	44-LQFP
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected
ECCN	3A991A2	3A991A2
HTSUS	8542.31.0001	8542.31.0001

Engineering Selection Recommendations

The AT89C51AC2T-RLTUM is the direct functional equivalent of the T89C51AC2-RLTIM. Selection of the AT89C51AC2T-RLTUM is supported by the following factors:

Product Status: The AT89C51AC2T-RLTUM maintains active product status, ensuring ongoing availability and manufacturer support.
Compliance Certification: The AT89C51AC2T-RLTUM is ROHS3 compliant, meeting current regulatory requirements for electronic components in restricted substance directives.
Parametric Equivalence: All electrical, memory, and functional parameters are identical to the obsolete T89C51AC2-RLTIM.
Package Compatibility: Both devices use the 44-LQFP package with identical pinout and mechanical dimensions.

Frequently Asked Questions (FAQ)

Q: Can the AT89C51AC2T-RLTUM be used as a direct replacement for the T89C51AC2-RLTIM?

A: Yes. The AT89C51AC2T-RLTUM is parametrically equivalent across all electrical, memory, and functional specifications. Both devices share identical core processor architecture, memory configuration, I/O count, peripheral set, and package type. No design modifications are required for substitution.

Q: What is the difference between the T89C51AC2-RLTIM and AT89C51AC2T-RLTUM?

A: The primary differences are product status and compliance certification. The T89C51AC2-RLTIM is classified as obsolete and is RoHS non-compliant. The AT89C51AC2T-RLTUM is an active product with ROHS3 compliance certification. All functional and electrical parameters are identical.

Q: Are the packages identical between these two parts?

A: Yes. Both the T89C51AC2-RLTIM and AT89C51AC2T-RLTUM use the 44-LQFP (44-VQFP 10x10mm) package with identical pinout, mechanical dimensions, and mounting requirements.

Q: What is the supply voltage range for these microcontrollers?

A: Both devices operate with a supply voltage range of 3V to 5.5V, providing flexibility for single-supply and dual-supply applications.

Q: How many I/O pins are available on these devices?

A: Both the T89C51AC2-RLTIM and AT89C51AC2T-RLTUM provide 34 I/O pins for interfacing with external circuits and peripherals.

Q: What memory configuration do these microcontrollers provide?

A: Both devices feature 32KB of FLASH program memory, 2KB of EEPROM, and 1.25KB of RAM, providing sufficient storage for embedded applications.

Q: What is the maximum operating frequency?

A: Both devices operate at a maximum clock speed of 40MHz, supporting real-time and time-critical applications.

Q: Are there any connectivity options available?

A: Yes. Both devices include UART/USART connectivity for serial communication with external devices and systems.

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