PIC16F873A Microcontroller IC

01 January 1970 User Review

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PIC16F873A/876A devices are available only in 28-pin packages, while PIC16F874A/877A devices are available in 40-pin and 44-pin packages. All devices in the PIC16F87XA family share common architecture with the following differences:

  •  The PIC16F873A and PIC16F874A have one-half of the total on-chip memory of the PIC16F876A and PIC16F877A
  • The 28-pin devices have three I/O ports, while the 40/44-pin devices have five
  •  The 28-pin devices have fourteen interrupts, while the 40/44-pin devices have fifteen
  •  The 28-pin devices have five A/D input channels, while the 40/44-pin devices have eight
  • The Parallel Slave Port is implemented only on the 40/44-pin devices


  • Maximum CPU Frequency: 20 MHz
  • Architecture: 8 bit 
  • Program Memory (Flash): 7 kB
  • RAM: 192 byte
  • Internal Oscillator: No
  • ADC: 1 (5 channels)
  • No. of Pins: 28
  • Voltage: 2V - 5.5V


  • 100,000 erase/write cycle Enhanced Flash program memory typical
  •  1,000,000 erase/write cycle Data EEPROM memory typical
  •  Data EEPROM Retention > 40 years
  •  Self-reprogrammable under software control
  •  In-Circuit Serial Programming™ (ICSP™) via two pins
  •  Single-supply 5V In-Circuit Serial Programming
  •  Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable operation
  •  Programmable code protection
  •  Power saving Sleep mode
  •  Selectable oscillator options
  •  In-Circuit Debug (ICD) via two pins


  •  Low-power, high-speed Flash/EEPROM technology
  •  Fully static design
  •  Wide operating voltage range (2.0V to 5.5V)
  •  Commercial and Industrial temperature ranges
  •  Low-power consumption
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