| Picture | ES Part No. | Part No | Stock | Price | Datasheet | Pb Free | RoHS | Description | Vendor | Case Style | Number of I/O | Core Processor | Program Memory Size (Bytes) | Non-Volatile Memory Size(Bytes-Data EE,Data Flash) | RAM Size (Bytes) | Package / Case | Mounting Type | ADC Bits/Channel | Communication | Core Sizes (Bits) | Max. Speed |
| | | | | | | | | | | | | | | | | | | | | |
 | 0065-0195-9 | AT89S8253-24AU | 3 | 133.00 |  | PB-Free | | 8-Bit MCS-51 MCU Flash 12KBytes,RAM 256 Bytes EEPROM 2KBytes, 24MHz | ATMEL | QFP | 32 | MCS51 | 12K | 2K | 256 | TQFP-44 | Surface Mount | - | 1 UART,1 SPI | 8 | 24MHz |
 | 0065-0197-5 | AT89C2051-24PU | 3,476 | 87.69 | | PB-Free | | 8-Bit MCS-51 MCU Flash 2KBytes,RAM 128 Bytes,24MHz | ATMEL | DIP | 15 | MCS51 | 2K | - | 128 | PDIP-20 | Through Hole | - | 1 UART | 8 | 24MHz |
 | 1522-0092-6 | AT89S52-24PU | 1,339 | 155.90 | | PB-Free | RoHS | 8-Bit MCS-51 MCU, Flash 8KBytes, 256Bytes, Speed 24MHz | MICROCHIP | DIP | 32 | MCS51 | 8K | - | 256 | PDIP-40 | Through Hole | - | 1 UART | 8 | 24MHz |
| 0065-0393-7 | AT89S52-24PU-T | 0 | 146.30 | | PB-Free | RoHS | 8-Bit MCS-51MCU ISP Flash 8KBytes,RAM 256 Bytes 24MHz | ATMEL | DIP | 32 | MCS51 | 8K | - | 256 | PDIP-40 | Through Hole | - | 1 UART | 8 | 24MHz |
| 0065-0247-0 | AT89S51-24PU | 1,171 | 135.60 | | PB-Free | | 8-Bit MCS-51 MCU ISP Flash 4KBytes,RAM 128Bytes 24MHz | ATMEL | DIP | 32 | MCS51 | 4K | - | 128 | PDIP-40 | Through Hole | - | 1 UART | 8 | 24MHz |
| 1522-0039-2 | AT89S8253-24PU | 0 | 260.40 | | PB-Free | RoHS | 8-Bit MCS-51 MCU Flash 12KBytes, RAM 256 Bytes EEPROM 2KBytes, 24MHz | MICROCHIP | DIP | 32 | MCS51 | 12K | 2K | 256 | PDIP-40 | Through Hole | - | 1 UART,1 SPI | 8 | 24MHz |
| 0065-0377-9 | AT89S8253-24PU-T | 0 | 190.70 | | PB-Free | RoHS | 8-Bit MCS-51 MCU ISP Flash 12KBytes,RAM 256 Bytes EEPROM 2KBytes,Speed 24MHz SPI,UART Interface | ATMEL | DIP | 32 | MCS51 | 12K | 2K | 256 | PDIP-40 | Through Hole | - | 1 UART,1 SPI | 8 | 24MHz |
 | 0065-0368-8 | AT89C2051-12SU | 530 | 70.86 | | PB-Free | RoHS | 8-Bit MCS-51 MCU Flash 2KBytes,RAM 128 Bytes,12MHz | ATMEL | SOIC | 15 | MCS51 | 2K | - | 128 | SOIC-20 | Surface Mount | - | 1 UART | 8 | 12MHz |
| 0065-0251-6 | AT89C51RC-24PU | 302 | 258.40 | | PB-Free | | 8-Bit MCS-51 MCU Flash 32KBytes,RAM 512Bytes,24MHz | ATMEL | DIP | 32 | MCS51 | 32K | - | 512 | PDIP-40 | Through Hole | - | 1 UART | 8 | 24MHz |
 | 0065-0360-2 | AT89C4051-24SU-T | 7 | 56.43 | | PB-Free | | 8-Bit MCS-51 MCU,Flash 4KBytes,RAM 128 Bytes,24MHz | ATMEL | SOIC | 15 | MCS51 | 4K | - | 128 | SOIC-20 | Surface Mount | - | 1 UART | 8 | 24MHz |
| 0035-1342-2 | SST89E516RD-40-C-PIE | 0 | 133.90 | | PB-Free | RoHS | 8-Bit 8051 MCU Flash 72KBytes,RAM 1024 Bytes EEPROM 64KBytes,Speed 40MHz UART,SPI Interface,Brown-out Detection | MICROCHIP | DIP | 32 | MCS51 | 72K | 64 | 1K | PDIP-40 | Through Hole | - | 1 UART,1 SPI | 8 | 40MHz |
 | 0035-2613-4 | AT89C51ED2T-RLTUM | 0 | 403.00 | | PB-Free | RoHS | 8-Bit MCS-51 MCU, Flash 64KBytes, RAM 2048Bytes, EEPROM 2048Bytes, Speed 60MHz | MICROCHIP | QFP | 34 | MCS51 | 64K | 2K | 2K | QFP-44 | Surface Mount | - | 1 UART,1 SPI | 8 | 60MHz |
| 0035-2650-1 | AT89C55WD-24AU | 300 | 163.00 | | PB-Free | RoHS | 8-Bit MCS-51 MCU, Flash 20KBytes, RAM 256Bytes, Speed 24MHz | MICROCHIP | QFP | 32 | MCS51 | 20K | - | 256 | QFP-44 | Surface Mount | - | 1 UART | 8 | 24MHz |
| 0035-2288-9 | AT89C51AC3-RLTUM | 0 | 541.80 | | PB-Free | RoHS | 8-Bit MCS-51 MCU Flash 64 KBytes,RAM 256 Bytes EEPROM 2KBytes,60MHz,10-Bit A/D Converter | MICROCHIP | QFP | 36 | MCS51 | 64K | 2K | 256 | QFP-44 | Surface Mount | 10/8 | 1 UART,1 SPI | 8 | 60MHz |
 | 0035-2383-3 | AT89S8253-24JU-T | 0 | 220.60 | | PB-Free | | 8-Bit MCS-51 MCU ISP Flash 12KBytes, 24MHz RAM 256 Bytes,EEPROM 2KBytes | MICROCHIP | LCC | 32 | MCS51 | 12K | 2K | 256 | PLCC-44 | Surface Mount | - | 1 UART,1 SPI | 8 | 24MHz |
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