| PartNumber | PIC16F639-I/SS | PIC16F636T-I/ST | PIC16F639-E/P |
| Description | 8-bit Microcontrollers - MCU 4kb 128 RAM 12 I/O | 8-bit Microcontrollers - MCU 4kb 128 RAM 12 I/O | 8-bit Microcontrollers - MCU 4kb 128 RAM 12 I/O |
| Manufacturer | Microchip | Microchip | Microchip |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| RoHS | Y | Y | Y |
| Mounting Style | SMD/SMT | SMD/SMT | Through Hole |
| Package / Case | SSOP-20 | TSSOP-14 | PDIP-14 |
| Series | PIC16F639 | PIC16F636 | PIC16F639 |
| Core | PIC | PIC | PIC |
| Data Bus Width | 8 bit | 8 bit | 8 bit |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz |
| Program Memory Size | 2 kB | 3.5 kB | 3.5 kB |
| Data RAM Size | 128 B | 128 B | 128 B |
| ADC Resolution | No ADC | No ADC | No ADC |
| Number of I/Os | 12 I/O | 12 I/O | 12 I/O |
| Operating Supply Voltage | 2 V to 5.5 V | 2 V to 5.5 V | 2 V to 5.5 V |
| Minimum Operating Temperature | - 40 C | - 40 C | - 40 C |
| Maximum Operating Temperature | + 85 C | + 85 C | + 125 C |
| Packaging | Tube | Reel | - |
| Height | 1.75 mm | 0.9 mm | 3.3 mm |
| Length | 7.2 mm | 5 mm | 26.16 mm |
| Product | MCU | MCU | MCU |
| Program Memory Type | Flash | Flash | Flash |
| Width | 5.3 mm | 4.4 mm | 6.35 mm |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Data RAM Type | SRAM | - | - |
| Data ROM Size | 256 B | 256 B | 128 B |
| Data ROM Type | EEPROM | Flash | Flash |
| Interface Type | SPI | RS-232, SPI, USB | SPI |
| Number of Timers/Counters | 2 Timer | 2 Timer | 2 Timer |
| Processor Series | PIC16 | PIC16 | PIC16 |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| Factory Pack Quantity | 67 | 2500 | 22 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Supply Voltage Max | 5.5 V | 5.5 V | 5.5 V |
| Supply Voltage Min | 2 V | 2 V | 2 V |
| Tradename | PIC | PIC | PIC |
| Unit Weight | 0.016000 oz | 0.004949 oz | 0.057144 oz |