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| PartNumber | ATTINY25-20SHR | ATTINY25-20SH | ATTINY25-20SI |
| Description | 8-bit Microcontrollers - MCU 2KB FLASH, 128B EE SRAM - 20MHz | 8-bit Microcontrollers - MCU 2KB FLASH 128B EE 128B SRAM 20MHz | IC MCU 8BIT 2KB FLASH 8SOIC |
| Manufacturer | Microchip | Microchip | - |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | - |
| RoHS | Y | Y | - |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package / Case | SOIC-8 | SOIC-8 | - |
| Series | ATtiny25 | ATtiny25 | - |
| Core | AVR | AVR | - |
| Data Bus Width | 8 bit | 8 bit | - |
| Maximum Clock Frequency | 20 MHz | 20 MHz | - |
| Operating Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | - |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Maximum Operating Temperature | + 85 C | + 85 C | - |
| Packaging | Reel | Tube | - |
| Height | 2.16 mm | 2.16 mm | - |
| Length | 5.35 mm | 5.35 mm | - |
| Product | MCU | MCU | - |
| Width | 5.4 mm | 5.4 mm | - |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | - |
| Processor Series | tinyAVR | tinyAVR | - |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | - |
| Factory Pack Quantity | 2000 | 95 | - |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | - |
| Tradename | AVR | AVR | - |
| Unit Weight | 0.019048 oz | 0.019048 oz | - |
| Program Memory Size | - | 2 kB | - |
| Data RAM Size | - | 128 B | - |
| Number of I/Os | - | 6 I/O | - |
| Program Memory Type | - | Flash | - |
| Data RAM Type | - | SRAM | - |
| Interface Type | - | SPI, USI | - |
| Moisture Sensitive | - | Yes | - |
| Number of Timers/Counters | - | 2 Timer | - |
| Supply Voltage Max | - | 5.5 V | - |
| Supply Voltage Min | - | 2.7 V | - |