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8051 Microcontrollers

Proven Technology for an Array of Embedded Applications

Protect the longevity of your 8051-based design by integrating one of our 8051 microcontrollers (MCUs) into your product. While other suppliers have exited this market, we continue to offer an extensive portfolio of proven 8051 devices. Our practice of client-driven obsolescence means that, when possible, we will continue to supply these devices for as long as you need them for use in your new designs as well as in your legacy products. From 8-bit MCUs based on the low-power, single-cycle AT89LP core, to MCS-51® industry-standard socket drop-in devices, our 8051 products all feature advanced Flash technologies and a rich set of peripherals. Whatever your design requirements are, you have access to the latest solutions for 8051 technology.

Browse by Compatibility

Choose pin-to-pin compatible members from our popular AT89LP family to replace end-of-life competitor devices. This family provides binary-code level compatibility for 80C51-based applications, low power consumption and all the modern features and peripherals that 8051 MCUs have to offer. The AT89LP devices can dramatically boost performance by a factor of 6 to 12 times, up to 30 MIPS. To speed up your development, go to the tabbed section below to download the AT89LP Developer Studio Integrated

Find Direct Replacements
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Browse by Core Application

Single-Cycle Core

Offering the latest in 8051 technology, these high-performance 8-bit MCUs execute most instructions in a single clock cycle. Application performance can be boosted to up to 30 MIPS throughput.

Flash In-System Programmable (ISP)

Offering a wide range of internal RAM configurations plus rich features such as interrupt controllers and timer/counters, the highly efficient design of these MCUs can help reduce system power consumption by bringing the clock frequency down to any value without data loss.

ROM-less

These powerful ROM-less 8051 MCUs are suitable for existing ROM-less applications that require a combination of performance, flexibility and power efficiency.

CAN MCUs

Offering the latest in 8051 technology, these high-performance 8-bit MCUs execute most instructions in a single clock cycle. Application performance can be boosted to up to 30 MIPS throughput.

USB MCUs

Offering a wide range of internal RAM configurations plus rich features such as interrupt controllers and timer/counters, the highly efficient design of these MCUs can help reduce system power consumption by bringing the clock frequency down to any value without data loss.

Lighting MCUs

These powerful ROM-less 8051 MCUs are suitable for existing ROM-less applications that require a combination of performance, flexibility and power efficiency.

8051 Microcontrollers

View All Parametrics
Product Status 5K Pricing CPU Type Architecture Family Program Memory Size (KB) Program Memory Size (KWords) Bootload capable SRAM (Bytes) Emulated EEPROM in Flash Max I/O Pins Pin count Max CPU Speed (MHz) Peripheral Pin Select / Pin Muxing Vbat/Vddbu battery backup Brown-Out Reset Low Voltage Detection Power On Reset Internal Oscillator Hardware RTCC/RTC Watch Dog Timer Number of Comparators Number of Op Amps Number of ADCs ADC Input Max ADC Resolution (Bits) Max ADC Sampling Rate (ksps) ADC with Computation Number of DACs DAC Outputs Max DAC Resolution (Bits) Internal Voltage Reference (Bandgap) Zero Cross detect Slope Compensation / Programmable Ramp Generator Data Signal Modulator CTMU Max 8-Bit Digital Timers Max 16-Bit Digital Timers Signal Measurement Timer Hardware Limit Timer Stand alone PWMs Capture / Compare/PWM (CCP) Enhanced Capture/Compare/PWM (ECCP) Max PWM outputs (including complementary) Number of PWM Time Bases PWM Max Resolution (Bits) Quadrature Encoder Interface Angular Timer Math Accelerator UART SPI I2C Number of USB Modules USB Interface USB Active Clock Tuning Number of CAN Modules CAN Transmit Buffers CAN Receive Buffers Ethernet LIN IrDA Parallel Port Class B Support CRC Configurable Logic Cell (CLC/CCL) Complementary Waveform Generator / Complementary Output Generator Numerically Controlled Oscillator Programmable Switched Mode Controller Hardware Cap Voltage Divider Cap. Touch Channels Segmented LCD Keeloq Hardware Crypto Engine JTAG Temp Range Min Temp Range Max Operation Voltage Min (V) Operation Voltage Max (V) High Voltage Capable Packages
AT80C51RD2 In Production $1.08 8-bit 8051 MCU 8 8-bit MCU 0 0 No 1 0 32 44 60 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 0 0 None No 0 0 0 None Yes No No No No 0 0 0 0 No 0 0 No No None 0 0 2.7 5.5 No 44/LQFP, 44/PLCC, 40/PDIP
AT89C2051 In Production $0.76 8-bit 8051 MCU 8 8-bit MCU 2 2 No 0 0 15 20 24 No No No No N/A No 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 0 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None -55 125 2.7 6 No 20/SOIC, 20/PDIP
AT89C4051 In Production $0.80 8-bit 8051 MCU 8 8-bit MCU 4 4 No 0 0 15 20 24 No No No No N/A No 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 0 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.7 6 No 20/SOIC, 20/PDIP
AT89C51IC2 In Production $4.43 8-bit 8051 MCU 8 8-bit MCU 32 32 API 1 0 34 44 60 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 1 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.7 5.5 No 44/LQFP, 44/PLCC
AT89C51RB2 In Production $3.78 8-bit 8051 MCU 8 8-bit MCU 16 16 API 1 0 32 44 60 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.7 5.5 No 44/LQFP, 44/PLCC, 40/PDIP
AT89C51RC In Production $1.52 8-bit 8051 MCU 8 8-bit MCU 32 32 No 0 0 32 44 24 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 0 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 4 6 No 44/TQFP, 44/PLCC, 40/PDIP
AT89C51RC2 In Production $4.33 8-bit 8051 MCU 8 8-bit MCU 32 32 API 1 0 32 44 60 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.7 5.5 No 44/LQFP, 44/PLCC, 40/PDIP
AT89C51RD2 In Production $4.54 8-bit 8051 MCU 8 8-bit MCU 64 64 API 2 0 32 44 60 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.7 5.5 No 44/LQFP, 64/LQFP, 44/PLCC
AT89C55WD In Production $1.53 8-bit 8051 MCU 8 8-bit MCU 20 20 No 0 0 32 44 24 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 0 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 4 6 No 44/TQFP, 44/PLCC, 40/PDIP
AT89LP2052 In Production $1.04 8-bit 8051 MCU 8 8-bit MCU 2 2 No 0 0 15 20 20 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.4 5.5 No 20/TSSOP, 20/SOIC, 20/PDIP
AT89LP213 In Production $1.06 8-bit 8051 MCU 8 8-bit MCU 2 2 No 0 0 14 14 20 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 0 1 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.4 5.5 No 14/TSSOP, 14/PDIP
AT89LP214 In Production $1.06 8-bit 8051 MCU 8 8-bit MCU 2 2 No 0 0 12 14 20 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.4 5 No 14/TSSOP, 14/PDIP
AT89LP216 In Production $1.02 8-bit 8051 MCU 8 8-bit MCU 2 2 No 0 0 14 16 20 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.4 5.5 No 16/SOIC
AT89LP4052 In Production $1.22 8-bit 8051 MCU 8 8-bit MCU 4 4 No 0 0 15 20 20 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.4 5.5 No 20/TSSOP, 20/SOIC, 20/PDIP
AT89LP51IC2 In Production $2.50 8-bit 8051 MCU 8 8-bit MCU 32 32 API 1 0 42 44 20 No No No No N/A Yes 0 0 0 7 10 153 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 1 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.4 5.5 No 44/LQFP, 44/VQFN, 44/PLCC
AT89LP51RB2 In Production $2.04 8-bit 8051 MCU 8 8-bit MCU 0 0 API 1 0 42 44 20 No No No No N/A Yes 0 0 0 7 10 153 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 1 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.4 5.5 No 44/LQFP, 44/TQFP, 44/VQFN, 44/PLCC
AT89LP51RC2 In Production $2.25 8-bit 8051 MCU 8 8-bit MCU 32 32 API 1 0 42 44 20 No No No No N/A Yes 0 0 0 7 10 153 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 1 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.4 5.5 No 44/LQFP, 44/TQFP, 44/VQFN, 44/PLCC
AT89LP51RD2 In Production $2.70 8-bit 8051 MCU 8 8-bit MCU 64 64 API 2 0 42 44 20 No No No No N/A Yes 0 0 0 7 10 153 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 1 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.4 5.5 No 44/LQFP, 44/TQFP, 44/VQFN, 44/PLCC, 40/PDIP
AT89LS51 In Production $1.13 8-bit 8051 MCU 8 8-bit MCU 4 4 No 0 0 32 44 16 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 0 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.7 4 No 44/TQFP, 44/PLCC, 40/PDIP
AT89LS52 In Production $1.23 8-bit 8051 MCU 8 8-bit MCU 8 8 No 0 0 32 44 16 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 0 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.7 4 No 44/TQFP, 44/PLCC, 40/PDIP
AT89S2051 In Production $1.39 8-bit 8051 MCU 8 8-bit MCU 2 2 No 0 0 15 20 24 No No No No N/A No 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 0 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.7 5.5 No 20/SOIC, 20/PDIP
AT89S4051 In Production $1.19 8-bit 8051 MCU 8 8-bit MCU 4 4 No 0 0 15 20 24 No No No No N/A No 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 0 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.7 5.5 No 20/SOIC, 20/PDIP
AT89S51 In Production $1.13 8-bit 8051 MCU 8 8-bit MCU 4 4 No 0 0 32 44 24 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 0 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 4 5.5 No 44/TQFP, 44/PLCC, 40/PDIP
AT89S52 In Production $1.22 8-bit 8051 MCU 8 8-bit MCU 8 8 No 0 0 32 44 24 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 0 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 4 5.5 No 44/TQFP, 44/PLCC, 40/PDIP
AT89C5130A-M In Production $3.24 8-bit 8051 MCU 8 8-bit MCU 16 16 API 1 1024 34 64 48 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 1 1 Full Speed No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.7 5.5 No 52/PLCC, 32/VQFN, 64/LQFP
AT89C5131A-L In Production $4.11 8-bit 8051 MCU 8 8-bit MCU 32 32 API 1 1024 34 64 48 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 1 1 Full Speed No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 3 3.6 No 52/PLCC, 64/LQFP, 28/SOIC
AT89C5131A-M In Production $4.00 8-bit 8051 MCU 8 8-bit MCU 32 32 API 1 1024 34 64 48 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 1 1 Full Speed No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.7 5.5 No 52/PLCC, 32/VQFN, 64/LQFP
AT89LP828 In Production $1.57 8-bit 8051 MCU 8 8-bit MCU 8 8 IAP 0 1024 30 32 25 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 2.4 5.5 No 32/TQFP, 28/SPDIP
AT89C5115 In Production $4.86 8-bit 8051 MCU 8 8-bit MCU 16 16 API 0 2048 20 32 40 No No No No N/A Yes 0 0 0 8 10 62 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 0 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 3 5.5 No 32/LQFP, 28/PLCC, 28/SOIC
AT89C51AC2 In Production $5.19 8-bit 8051 MCU 8 8-bit MCU 32 32 API 1 2048 34 44 40 No No No No N/A Yes 0 0 0 8 10 62 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 0 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 3 5.5 No 44/LQFP, 44/PLCC
AT89C51AC3 In Production $5.41 8-bit 8051 MCU 8 8-bit MCU 64 64 API 2 2048 32 64 60 No No No No N/A Yes 0 0 0 8 10 62 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 0 0 None No 0 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 3 5.5 No 44/LQFP, 52/PLCC, 64/LQFP, 44/PLCC
AT89C51CC01 In Production $4.81 8-bit 8051 MCU 8 8-bit MCU 32 32 API 1 2048 34 44 40 No No No No N/A Yes 0 0 0 8 10 62 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 0 0 0 None No 1 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 3 5.5 No 44/LQFP, 44/PLCC
AT89C51CC02 In Production $4.33 8-bit 8051 MCU 8 8-bit MCU 16 16 API 0 2048 20 32 40 No No No No N/A Yes 0 0 0 8 10 62 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 0 0 0 None No 1 0 0 None No No No No No 0 0 0 0 No 0 0 No No None -40 85 3 5.5 No 32/LQFP, 28/PLCC, 28/SOIC
AT89C51CC03 In Production $5.66 8-bit 8051 MCU 8 8-bit MCU 64 64 API 2 2048 37 64 40 No No No No N/A Yes 0 0 0 8 10 62 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1 1 0 0 None No 1 0 0 None No No No No No 0 0 0 0 No 0 0 No No None 0 0 3 5.5 No 44/LQFP, 52/PLCC, 64/LQFP, 44/PLCC
AT89C51ED2 In Production $5.19 8-bit 8051 MCU 8 8-bit MCU 64 64 API 2 2048 32 44 60 No No No No N/A Yes 0 0 0 0 0 0 No 0 0 0 No No 0 0 No 0 0 0 0 0 0 0 0 0 0 0 No No 1