PIC16LF77-I/ML - 8-bit MCU, 14KB Flash, 33 I/O, 44-QFN | Microchip
MPN: PIC16LF77-I/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.85 | $7.85 |
| 10 | $7.05 | $70.50 |
| 100 | $6.3 | $630.00 |
| 500 | $5.65 | $2,825.00 |
| 1,000 | $5.1 | $5,100.00 |
PIC16LF77-I/ML Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (Flash/ROM and RAM), and peripherals around an 8-bit data path. PIC microcontrollers use a Harvard RISC architecture with a 14-bit instruction word optimized for deterministic single-cycle execution. Within the broader taxonomy, PIC16F7x devices sit in the PIC16 mid-range family, which is itself a sub-family of Microchip's 8-bit PIC microcontroller portfolio (PIC10/12/16/18) under the wider class of embedded microcontrollers and semiconductors.
Key features of the PIC16LF77-I/ML include 14KB of self-programmable Flash program memory, 368 bytes of data RAM, a 10-bit successive-approximation ADC with up to 8 channels, three timer/counter modules, a synchronous serial port (SSP) supporting SPI and I2C, a USART for asynchronous serial communication, and a parallel slave port. The device operates across an industrial temperature range of -40C to +85C and supports 33 digital I/O pins, allowing direct interfacing with sensors, keypads, displays, and actuators.
The architecture combines a high-performance 14-bit RISC CPU with a 200 ns instruction cycle at 20 MHz oscillator input, Harvard bus architecture for simultaneous instruction and data fetches, and a wide operating voltage range that extends down to 2.0V. Integrated peripherals - ADC, comparators, PWM, and capture/compare modules - reduce total BOM count and PCB area in mixed-signal embedded systems.
Typical applications include industrial control and automation (sensor interfacing, motor drive logic), low-power consumer electronics (appliance controllers, battery-powered instruments), automotive body and chassis subsystems (HVAC control, instrument clusters), medical monitoring devices (portable measurement instruments), and general-purpose embedded products requiring 8-bit deterministic control. The wide I/O count and rich peripheral set also suit data acquisition front-ends and human-machine interface (HMI) panels.
When designing with the PIC16LF77-I/ML, ensure the QFN thermal pad is properly soldered to a sufficient copper pour for heat dissipation, place the decoupling capacitor pair (100 nF + 10 uF) within 5 mm of the VDD pins, and reserve MCLR pin handling with the recommended 10 kohm pull-up. Programming/debugging is supported via ICSP using MPLAB tools and the PICkit or ICD programmers.
This page synthesizes distributor stock and pricing from authorized channels, pin-compatible drop-in alternatives in the same 44-QFN footprint, and practical design notes - information engineers need that the bare datasheet does not aggregate.
Drop-in alternatives for PIC16LF77-I/ML — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC16LF77-I/ML (same form factor and footprint) — differing in Package, ADC, Family, Timers, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LF777-I/ML
✅ Drop-In✓ In Stock
$3.05 / Unit
View Datasheet →PIC16F77-I/ML
✅ Drop-In✓ In Stock
$3.95 / Unit
View Datasheet →PIC16LF74-I/ML
✅ Drop-In✓ In Stock
$5.4 / Unit
View Datasheet →PIC16LF767-I/ML
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.74 / Unit
View Datasheet →PIC16LF727-I/MV
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.85 / Unit
View Datasheet →PIC16LF77-I/ML Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit Microcontroller (MCU) |
| Core Architecture | PIC16 RISC, 14-bit instruction word |
| Family | PIC16F7x |
| Program Memory (Flash) | 14 KB |
| Data RAM | 368 bytes |
| Maximum I/O Pins | 33 |
| ADC | 10-bit, up to 8 channels |
| Timers | 3 (Timer0, Timer1, Timer2) |
| Serial Interfaces | USART, SSP (SPI / I2C) |
| Parallel Slave Port | Yes |
| Operating Voltage | 2.0 V to 5.5 V (LF variant) |
| Maximum Clock Frequency | 20 MHz (200 ns instruction cycle) |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 44-pin QFN (ML) 8x8 mm |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC16LF77-I/ML Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input, active low; connect to VDD via 10 kohm pull-up |
| Pin 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC positive reference |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| Pin 8 | RE0/RD/AN5 — PORTE bit 0 / Parallel slave port read / Analog input 5 |
| Pin 9 | RE1/WR/AN6 — PORTE bit 1 / Parallel slave port write / Analog input 6 |
| Pin 10 | RE2/CS/AN7 — PORTE bit 2 / Parallel slave port chip select / Analog input 7 |
| Pin 11 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKI — Oscillator input / external clock input |
| Pin 14 | OSC2/CLKO — Oscillator output / clock output |
| Pin 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| Pin 17 | RC2/CCP1 — PORTC bit 2 / CCP1 output |
| Pin 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 19 | RD0/PSP0 — PORTD bit 0 / Parallel slave port data bit 0 |
| Pin 20 | RD1/PSP1 — PORTD bit 1 / Parallel slave port data bit 1 |
| Pin 21 | RD2/PSP2 — PORTD bit 2 / Parallel slave port data bit 2 |
| Pin 22 | RD3/PSP3 — PORTD bit 3 / Parallel slave port data bit 3 |
| Pin 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 25 | RC6/TX/CK — PORTC bit 6 / USART async transmit / sync clock |
| Pin 26 | RC7/RX/DT — PORTC bit 7 / USART async receive / sync data |
| Pin 27 | RD4/PSP4 — PORTD bit 4 / Parallel slave port data bit 4 |
| Pin 28 | RD5/PSP5 — PORTD bit 5 / Parallel slave port data bit 5 |
| Pin 29 | RD6/PSP6 — PORTD bit 6 / Parallel slave port data bit 6 |
| Pin 30 | RD7/PSP7 — PORTD bit 7 / Parallel slave port data bit 7 |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
| Pin 33 | RB0/INT — PORTB bit 0 / External interrupt input |
| Pin 34 | RB1 — PORTB bit 1 |
| Pin 35 | RB2 — PORTB bit 2 |
| Pin 36 | RB3/PGM — PORTB bit 3 / Low-voltage ICSP programming input |
| Pin 37 | RB4 — PORTB bit 4 |
| Pin 38 | RB5/PGM — PORTB bit 5 / Low-voltage ICSP programming input |
| Pin 39 | RB6/PGC — PORTB bit 6 / ICSP clock (programming/debug) |
| Pin 40 | RB7/PGD — PORTB bit 7 / ICSP data (programming/debug) |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC16LF77-I/ML is suitable for 6 applications: Industrial Sensor Monitoring, Battery-Powered Consumer Appliance, Automotive Body and HVAC Control, Portable Medical Monitoring Device, Human-Machine Interface (HMI) Panel, Data Acquisition Front End.
Industrial Sensor Monitoring
The PIC16LF77-I/ML's 10-bit ADC with 8 channels and 33 I/O pins make it ideal for industrial sensor monitoring nodes that read multiple analog transducers (temperature, pressure, flow) and report back over UART or SPI. The 2.0 V minimum VDD supports 3.3 V operation common in industrial field instrumentation, while the 14 KB Flash accommodates calibration tables and linearization firmware. Placed on a sensor interface board with a 4-20 mA loop driver or RS-485 transceiver, the MCU performs signal conditioning and protocol framing deterministically at 5 MIPS. Its wide -40C to +85C industrial temperature range matches factory floor environments without derating.
Recommended
Battery-Powered Consumer Appliance
The LF (low-power) silicon process gives the PIC16LF77-I/ML a sleep current in the microamp range while retaining the full 14 KB Flash and 33 I/O of the F77 family, enabling years of battery life in portable appliances such as handheld meters or remote controls. Operating down to 2.0 V extends usable battery life from a 3 V coin cell below 10% remaining capacity. The integrated 10-bit ADC monitors battery voltage and sensor inputs without external components. Combined with a low-dropout regulator and a low-quiescent sensor, the MCU provides deterministic control for keypad scanning, display driving, and wireless transmit scheduling via SPI-attached radio.
Recommended
Automotive Body and HVAC Control
Automotive body controllers and HVAC modules use the PIC16LF77-I/ML for fan-speed PWM control, temperature sensing, and switch-matrix input handling. The 33 I/O pins support direct connection to a keypad/button matrix, LED drivers, and BLDC fan tachometer inputs, while the 14 KB Flash holds HVAC state-machine firmware. Operating up to 5.5 V tolerates the 12 V automotive rail after local regulation, and the -40C to +85C industrial range covers cabin environments. The parallel slave port enables connection to a host ECU for shared-display data, and the 10-bit ADC reads multiple thermistors and potentiometers for setpoint control.
Recommended
Portable Medical Monitoring Device
The PIC16LF77-I/ML fits portable medical monitors (pulse oximeters, glucose meters, digital thermometers) where low-voltage operation, deterministic control, and reliable Flash storage of calibration data are critical. The 10-bit ADC captures amplified photodiode or electrochemical-sensor signals, and 14 KB Flash stores patient-record buffers and look-up tables for non-linear sensor compensation. The wide operating voltage (2.0-5.5 V) supports direct Li-ion battery connection with a simple LDO, while the low-power sleep modes extend battery life between measurements. USART and SSP peripherals link to BLE or USB-CDC modules for data upload to a clinician's dashboard.
Recommended
Human-Machine Interface (HMI) Panel
The PIC16LF77-I/ML drives small HMI panels combining character LCDs, seven-segment displays, and matrix keypads in industrial equipment. With 33 I/O pins it directly multiplexes up to a 4x5 keypad and 8-digit seven-segment display without external I/O expanders, while the parallel slave port allows a host processor to update display contents via a high-speed 8-bit bus. The 14 KB Flash holds the menu navigation and debouncing logic, and the SSP peripheral drives SPI-attached graphical or character OLEDs. The industrial temperature rating makes it suitable for factory-floor operator panels.
Recommended
Data Acquisition Front End
The PIC16LF77-I/ML acts as a low-cost data-acquisition front end in test-and-measurement systems, scanning up to 8 analog channels with its 10-bit ADC, buffering samples in 368 B RAM, and streaming them out via USART to a PC or higher-tier processor. The 20 MHz clock enables sampling rates up to ~50 kSPS aggregate, sufficient for low-bandwidth instrumentation. The wide 2.0-5.5 V operating range simplifies dual-supply analog designs, and the integrated SSP supports SPI-attached external ADCs when higher resolution is required. Industrial temperature rating and the 44-QFN's compact footprint suit dense multi-channel DAQ boards.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LF77-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LF777-I/ML | PIC16F77-I/ML | PIC16LF74-I/ML | PIC16LF767-I/ML | PIC16LF727-I/MV |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-QFN (ML) 8x8 mm | 44-QFN (ML) - same | 44-QFN (ML) - same | 44-QFN (ML) - same | 44-QFN (ML) - same | 44-QFN (MV) - same footprint family |
| Program Flash | 14 KB | 14 KB | 14 KB | 7 KB (-50%) | 14 KB | 14 KB |
| Data RAM | 368 bytes | 368 bytes | 368 bytes | 192 bytes (-48%) | 368 bytes | 368 bytes |
| I/O Pins | 33 | 33 | 33 | 33 | 36 | 36 |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 4.0 V to 5.5 V (no LF) | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 1.8 V to 3.6 V |
| Max Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 10 MHz | 32 MHz (XLP) |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Low-voltage 2.0 V minimum VDD enables battery-powered 3.3 V designs (vs PIC16F77-I/ML)
- Same 44-QFN footprint as enhanced successors for drop-in upgradability (vs PIC16LF727-I/MV)
- 33 I/O pins with parallel slave port for host-MCU bus interfaces (vs PIC16LF767-I/ML)
Design Notes
The PIC16LF77-I/ML accepts 2.0 V to 5.5 V on VDD (pins 11 and 32) with VSS on pins 12 and 31. Place a 100 nF decoupling capacitor within 5 mm of each VDD pin and a bulk 10 uF tantalum or ceramic at the board supply entry. For analog reference stability, add a 10 uF + 100 nF pair at AVdd/AVss if the part is configured for separate analog supply. Inductive loads driven by I/O pins require flyback diodes to prevent latch-up; high-side MOSFET switches should include gate-source pull-downs to define the off-state.
The 44-pin QFN (ML) package has an exposed thermal pad (EP) that must be soldered to a copper pour on the PCB for heat dissipation. At maximum 20 MHz operation with all 33 I/O pins toggling at 50% duty, the MCU dissipates approximately 100 mW - well within QFN ratings - but a thermal pad pour of at least 25 mm^2 on top and inner PCB layers is recommended to keep junction temperature below 70C at 25C ambient. Without the thermal pad connection, theta_JA rises sharply and long-term reliability degrades.
Route the oscillator traces (OSC1/OSC2) as short as possible and guard them with a ground pour to minimize EMI pickup. Keep the MCLR trace short and isolate it from switching signal traces; place the 10 kohm pull-up resistor within 3 mm of the MCLR pin. If using ICSP for in-circuit programming, dedicate pins RB6/PGC and RB7/PGD in your schematic with a 4.7 kohm series resistor on each line to allow programming without removing the MCU from board. Use a star-ground topology with separate analog and digital grounds joined at a single point near the MCU's VSS pin.
Do not leave the MCLR pin floating - even brief voltage spikes below Vih can trigger spurious resets. Always populate the recommended 10 kohm pull-up to VDD. The LF (low-voltage) variants only operate down to 2.0 V; do not substitute an LF part in a design that needs 5 V tolerance beyond VDD+0.3 V on any pin, as I/O pin voltage tolerance is VDD-referenced. Finally, ensure the CONFIG words are set correctly for the oscillator mode (HS, XT, LP, RC) to match your crystal or resonator - a mismatch causes the device to fail to start or run at the wrong frequency.
Compliance Information
RoHS and lead-free status per Microchip product page; AEC-Q100 automotive qualification not listed for the I (industrial) grade. For automotive applications requiring AEC-Q100, consider PIC16F77-E/ML or PIC16LF77-I/ML variants qualified to automotive standards - confirm with Microchip.
