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Home Products Integrated Circuits (ICs)Embedded - Microcontrollers~~AT89C51ED2-RDRIM~~

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AT89C51ED2-RDRIM - Microchip Technology

Name: Microchip Technology AT89C51ED2-RDRIM
Brand: Microchip Technology
SKU: AT89C51ED2-RDRIM
Availability: InStock
Rating: 5 (1 reviews)

Manufacturer Part Number: AT89C51ED2-RDRIM

Manufacturer: Microchip Technology

Allelco Part Number: 98D-AT89C51ED2-RDRIM

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 14,332 pcs available, New & Original

Parts Description: IC MCU 8BIT 64KB FLASH 44VQFP

Package: 44-VQFP (10x10)

Data sheet: AT89C51ED2-RDRI.pdf

Datasheets
Cylindrical Battery Holders.pdf

PCN Packaging
Transfer to Microchip/Label/Pkg 5/Sep/2016.pdf MBB/Label Chgs 16/Nov/2018.pdf

RoHs Status

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In stock: 14332

Specifications

AT89C51ED2-RDRIM Tech Specifications
Microchip Technology - AT89C51ED2-RDRIM technical specifications, attributes, parameters and parts with similar specifications to Microchip Technology - AT89C51ED2-RDRIM

Product Attribute	Attribute Value
Manufacturer	Microchip Technology
Voltage - Supply (Vcc/Vdd)	2.7V ~ 5.5V
Supplier Device Package	44-VQFP (10x10)
Speed	60MHz
Series	89C
RAM Size	2K x 8
Program Memory Type	FLASH
Program Memory Size	64KB (64K x 8)
Peripherals	POR, PWM, WDT
Package / Case	44-LQFP
Package	Tape & Reel (TR)

Product Attribute	Attribute Value
Oscillator Type	External
Operating Temperature	-40°C ~ 85°C (TA)
Number of I/O	50
Mounting Type	Surface Mount
EEPROM Size	2K x 8
Data Converters	-
Core Size	8-Bit
Core Processor	80C51
Connectivity	SPI, UART/USART
Base Product Number	AT89C51

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)
REACH Status	REACH Unaffected
ECCN	3A991A2
HTSUS	8542.31.0001

Frequently Asked Questions(FAQ)

What are the key differences between the AT89C51ED2-RDRIM and the standard 80C51 microcontroller in terms of program memory architecture and real-time performance?: The AT89C51ED2-RDRIM extends the classic 80C51 core by integrating a 64KB (64K x 8) FLASH program memory, which allows for larger firmware storage compared to earlier variants that typically offered up to 32KB. This increased memory capacity supports more complex applications without requiring external memory chips. Operating at up to 60MHz, it delivers significantly higher instruction throughput—approximately 1.5 times faster than the traditional 40MHz maximum of basic 80C51 implementations. The internal FLASH memory also enables in-system reprogramming, reducing development iteration time during debugging phases.

How does the voltage supply range of the AT89C51ED2-RDRIM influence system design when interfacing with legacy 5V logic components?: The AT89C51ED2-RDRIM operates over a wide supply voltage range from 2.7V to 5.5V, which provides flexibility in mixed-voltage environments. When connecting to legacy 5V systems, designers can safely operate the device at full 5V Vcc while ensuring that I/O pins are configured with appropriate level shifting or bidirectional buffers if interfacing with 3.3V-only devices within the same system. This broad tolerance reduces the need for dedicated voltage regulators across subsystems but requires careful attention to signal integrity at the edges of the valid input high threshold near 3.3V under lower supply conditions.

What considerations should be made regarding oscillator selection when using the AT89C51ED2-RDRIM in a precision timing application?: Since the AT89C51ED2-RDRIM relies on an external oscillator, the choice of crystal frequency directly impacts timing accuracy and system clock stability. For applications requiring precise delays or baud rate generation—such as UART communication—a temperature-compensated crystal oscillator (TCXO) or a high-stability fundamental-mode crystal with tight load capacitance matching (±5% tolerance) is recommended. The maximum rated frequency of 60MHz implies that even sub-megahertz crystals can be used effectively, allowing trade-offs between power consumption and processing headroom. Avoid ceramic resonators due to their sensitivity to parasitic capacitance and temperature drift beyond ±0.5% over the operating temperature range.

Can the AT89C51ED2-RDRIM be substituted with the AT89C51ED2-RDRUM in designs requiring surface mount assembly on a 10x10mm footprint?: Yes, the AT89C51ED2-RDRUM shares the same 44-VQFP (10x10) package and pinout as the AT89C51ED2-RDRIM, making them mechanically interchangeable in PCB layouts. Both devices feature identical electrical characteristics, including 64KB FLASH memory, 60MHz operation, and 34 GPIOs. However, availability may differ between regional distributors, and supply chain risk assessment should consider lead times. Designers should verify current stock levels and certification status before final substitution.

What impact does the absence of an internal ADC have on peripheral integration when selecting the AT89C51ED2-RDRIM for sensor-based monitoring systems?: The AT89C51ED2-RDRIM lacks built-in analog-to-digital converters, so any analog signal acquisition must rely on external ADCs connected via SPI or parallel interfaces. This increases component count but allows flexibility in resolution (e.g., 12-bit vs. 16-bit), sampling speed, and input channel count. When designing sensor nodes, this necessitates additional consideration for reference voltage stability, anti-aliasing filtering, and digital noise immunity—especially since the device’s digital switching noise could couple into sensitive analog traces if layout practices are not strictly followed.

How does the watchdog timer (WDT) implementation in the AT89C51ED2-RDRIM affect fault recovery strategies in battery-powered industrial control applications?: The integrated WDT provides robust protection against software lockups by resetting the microcontroller if the firmware fails to periodically clear the timer register. In battery-operated systems where human intervention is impractical, this feature enhances reliability by automatically recovering from hangs caused by stack overflows or infinite loops. Designers must ensure that critical tasks execute frequently enough to service the WDT—typically every few hundred milliseconds—and avoid disabling it unnecessarily during calibration routines unless intentional fault logging is required.

What are the implications of RoHS non-compliance for the AT89C51ED2-RDRIM in EU-market product development?: As the AT89C51ED2-RDRIM is marked RoHS non-compliant, its use in new equipment placed on the European market after July 2006 may violate regulatory requirements unless exempted under specific clauses. This affects end-product certification processes and could result in customs delays or market withdrawal. Engineers sourcing this part should confirm whether their application qualifies for exemptions (e.g., medical devices, military, or industrial equipment with extended compliance timelines) or plan to migrate to a compliant alternative such as the AT89C51AC2 series, which offers similar performance with full RoHS adherence.

Why might a designer choose the AT89C51ED2-RDRIM over newer ARM-based microcontrollers despite its 8-bit architecture?: The AT89C51ED2-RDRIM remains attractive in cost-sensitive, deterministic-control applications where code size efficiency and predictable execution timing outweigh raw computational throughput. Its mature toolchain, extensive library support, and compatibility with existing 80C51 ecosystems reduce development risk and training overhead. Additionally, the small RAM footprint (only 2KB) and low dynamic power consumption make it suitable for simple embedded controllers in HVAC, lighting, or appliance domains where complexity does not justify moving to a 32-bit architecture.

Parts with Similar Specifications

The three parts on the right have similar specifications to Microchip Technology AT89C51ED2-RDRIM

Product Attribute
Part Number	AT89C51ED2-RDRUM	AT89C51ED2-RDTIM	AT89C51ED2-RLRIM	AT89C51ED2-RDRUM
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Atmel
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Core Size	-	-	-	-
Supplier Device Package	-	196-NFBGA (12x12)	16-PDIP	64-VQFN (9x9)
RAM Size	-	-	-	-
Program Memory Type	-	-	-	-
Number of I/O	-	-	-	-
Series	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Voltage - Supply (Vcc/Vdd)	-	-	-	-
Oscillator Type	-	-	-	-
EEPROM Size	-	-	-	-
Core Processor	-	-	-	-
Peripherals	-	-	-	-
Data Converters	-	-	-	-
Program Memory Size	-	-	-	-
Base Product Number	-	DAC34H84	MAX500	ADS62P42
Speed	-	-	-	-
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Connectivity	-	-	-	-
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C

AT89C51ED2-RDRIM Datasheet PDF

Download AT89C51ED2-RDRIM pdf datasheets and Microchip Technology documentation for AT89C51ED2-RDRIM - Microchip Technology.

Datasheets: Cylindrical Battery Holders.pdf
PCN Packaging: Transfer to Microchip/Label/Pkg 5/Sep/2016.pdf MBB/Label Chgs 16/Nov/2018.pdf

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Customer Reviews

Evaluation: 10 Articles

Nath***rooks

Jun 11, 2026

Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.
Dani***alkerTech

Jun 1, 2026

Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.
Yuki***aka88

May 26, 2026

信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。
Stev***aker

May 20, 2026

Solid diode for power rectification. Works well in switching circuits.
Bran***Lewis

May 11, 2026

Compact FPGA with good performance. Suitable for basic signal processing tasks.
Oliv***arris

May 7, 2026

Reliable I/O expander. Works well in embedded control applications.
Jess***Jones

Apr 17, 2026

It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.
Mich***Smith

Apr 17, 2026

Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.
Aman***arris

Apr 3, 2026

It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.
Mike***nch

Apr 3, 2026

Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

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Common Countries Logistic Time Reference
Region	Country	Logistic Time(Day)
America	United States	5
America	Brazil	7
Europe	Germany	5
	United Kingdom	4
	Italy	5
Oceania	Australia	6
Oceania	New Zealand	5
Asia	India	4
Asia	Japan	4
Middle East	Israel	6

DHL & FedEx Shipment Charges Reference
Shipment charges(KG)	Reference DHL(USD$)
0.00kg-1.00kg	USD$30.00 - USD$60.00
1.00kg-2.00kg	USD$40.00 - USD$80.00
2.00kg-3.00kg	USD$50.00 - USD$100.00

Note:: The above table is for reference only. There may have some data bias for the uncontrollable factors.
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