PIC16F676-I/ML
PIC16F676-I/ML - 8-bit MCU, 1.75KB Flash, 10-bit ADC, QFN-14 | Microchip
The Microchip Technology PIC16F676-I/ML is a 14-pin CMOS Flash-based 8-bit PIC microcontroller with 1.75KB (1K x 14) of program memory, 64 bytes of SRAM, and 128 bytes of EEPROM, housed in a 4x4 mm QFN-14 (ML) package. It executes instructions in a 200 ns cycle at 20 MHz and features 8 channels of 10-bit Analog-to-Digital conversion, 12 I/O pins, an enhanced USART (enhanced universal asynchronous/synchronous receiver-transmitter), one 8-bit and one 16-bit timer, an internal 4 MHz precision oscillator, an analog comparator, and an on-chip programmable pull-up resistors. The device operates from 2.0V to 5.5V across an industrial -40C to +85C temperature range and is targeted at cost-sensitive embedded designs that need integrated ADC, EEPROM, and ultra-low sleep current. The "-I" suffix denotes the industrial temperature grade and the "/ML" suffix denotes the QFN-14 (4x4 mm) lead-free package.
A PIC microcontroller is a compact, low-power programmable processor built around a Harvard architecture, where program and data memories are physically separated and accessed through independent buses. PIC MCUs belong to the broader 8-bit microcontroller category and are widely used in applications requiring deterministic timing, simple programming models, and robust peripheral integration. Within Microchip's portfolio, the PIC16F family is positioned as a mid-range 8-bit line that balances code density, peripheral set, and cost. The PIC16F676 specifically adds an on-board 10-bit ADC, internal voltage reference, comparator, and EEPROM, making it a versatile workhorse for sensor interfacing, simple closed-loop control, and battery-powered designs.
Key features that distinguish the PIC16F676-I/ML include 35 single-word instructions, a programmable code protection scheme, in-circuit serial programming (ICSP) via two pins, ultra-low sleep current of approximately 1 nA typical, and wide operating voltage tolerance suitable for both 3.3V and 5V rails. The internal 4 MHz oscillator with software-selectable calibration removes the need for an external crystal in many designs, while the analog comparator with programmable on-chip reference supports low-cost analog front ends.
Architecturally, the PIC16F676 uses a 14-bit instruction word RISC (reduced instruction set computer) core with a hardware stack depth of 8 and direct, indirect, and relative addressing modes. The 10-bit ADC supports up to 8 analog inputs with sequential or triggered conversion, and the enhanced USART enables RS-232/RS-485 communication with autobaud detection. Together these features enable the MCU to perform sensor signal acquisition, simple protocol bridging, and low-speed logic replacement in a single chip.
Typical applications include smoke detectors, LED lighting controls, battery chargers, sensor interfaces, smart energy meters, small appliance controllers, and general-purpose logic replacement in industrial and consumer designs. The QFN-14 footprint enables compact PCB layouts where 14-pin SOIC or PDIP would not fit.
When designing with the PIC16F676-I/ML, ensure decoupling is placed close to VDD and that unused I/O pins are configured as outputs to minimize current consumption. Engineers evaluating new designs should also consider PIC16F18324, which Microchip recommends as a newer functionally similar replacement with extended peripherals, more memory, and active lifecycle support.
This page synthesizes distributor pricing, drop-in alternatives, pinout diagrams, and practical design notes that complement the manufacturer datasheet with engineering judgement for real-world designs.
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