PIC18LF442-I/L - 8-bit MCU 16KB Flash 40MHz 44-PLCC | Microchip
MPN: PIC18LF442-I/L ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.85 | $9.85 |
| 10 | $8.94 | $89.40 |
| 100 | $7.92 | $792.00 |
| 500 | $7.05 | $3,525.00 |
| 1,000 | $6.28 | $6,280.00 |
PIC18LF442-I/L Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/flash), data memory (RAM), and peripherals. The PIC18F architecture is an enhanced 8-bit family within the broader PIC microcontroller hierarchy, offering 77 single-word instructions with 16-bit instruction width. PIC18LF variants are the low-power "LF" family members optimized for 2.0-5.5 V operation, while PIC18F (without the "L") targets 4.2-5.5 V. The PIC18LF442 specifically targets industrial-temperature, low-voltage designs where the 2 V minimum rail extends battery and energy-harvesting lifetime.
Key differentiating specifications include a 10-bit ADC with up to 8 channels, a USART, MSSP (SPI/I2C), capture/compare/PWM modules, dual analog comparators, and a 16-bit timer architecture. The 40 MHz oscillator drives 10 MIPS throughput, making it well-suited for control loops and serial-bus bridging. Brown-out Reset (BOR), Power-on Reset (POR), Watchdog Timer with its own on-chip RC oscillator, and In-Circuit Serial Programming (ICSP) provide robust embedded deployment.
The PIC18F core uses a Harvard architecture with separate program and data buses, plus a 32-level hardware stack. The "LF" low-power process technology provides reduced active and sleep current versus the standard "F" siblings, which is the principal differentiator from PIC18F442 in 5 V designs. Code compatibility across PIC16C5X/PIC12CXXX/PIC16CXX/PIC17CXX preserves legacy code while enabling migration to higher performance.
Typical applications include industrial automation controllers, sensor interface nodes, automotive body electronics (non-safety), HVAC control panels, smart metering, and consumer appliance control. The 44-PLCC footprint is convenient for socketed prototyping and field-replaceable modules, and the 5.5 V tolerance eases integration with legacy 5 V analog front ends.
When designing with this part, place decoupling capacitors (100 nF plus bulk) within a few millimetres of every VDD/VSS pin pair, especially because the ADC reference shares VDD. Configure CONFIG words to match oscillator mode, BOR threshold, and watchdog state before code execution - locked-out debug or wrong clock mode is the most common bring-up failure on this family.
This page consolidates distributor pricing, drop-in compatible alternatives, and practical design notes that go beyond the manufacturer datasheet to support faster design-in and sourcing decisions for the PIC18LF442-I/L.
Drop-in alternatives for PIC18LF442-I/L — 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 PIC18LF442-I/L (same form factor and footprint) — differing in Mounting Type, Operating Temperature, Package, Program Memory (Flash), Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F442-I/L
✅ Drop-In✓ In Stock
$3.75 / Unit
View Datasheet →PIC18LF442T-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF442-I/P
✅ Drop-In✓ In Stock
$5.55 / Unit
View Datasheet →PIC18LF452-I/L
✅ Drop-In✓ In Stock
$7.85 / Unit
View Datasheet →PIC18F452-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F442T-I/L
✅ Drop-In✓ In Stock
$4.61 / Unit
View Datasheet →PIC18LF442-I/L Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18F (8-bit RISC, Harvard) |
| Instruction Set Width | 16-bit |
| Program Memory (Flash) | 16 KB (8K x 16) |
| Data RAM | 768 bytes |
| Data EEPROM | 256 bytes |
| Maximum Clock Frequency | 40 MHz (10 MIPS) |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 34 |
| ADC | 10-bit, up to 8 channels |
| Timers | Timer0/1/2/3, 16-bit capable |
| Capture/Compare/PWM | Yes (CCP/ECCP modules) |
| Communication | USART, MSSP (SPI / I2C) |
| Comparators | 2 analog comparators |
| Package | 44-pin PLCC (16.59 x 16.59 mm) |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Mounting Type | Surface Mount (PLCC socket-compatible) |
| Programming/Debug | ICSP (In-Circuit Serial Programming) |
| RoHS Status | Compliant |
PIC18LF442-I/L Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (reset) input or programming voltage input |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC negative reference |
| 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 / read control / analog input 5 |
| Pin 9 | RE1/WR/AN6 — PORTE bit 1 / write control / analog input 6 |
| Pin 10 | RE2/CS/AN7 — PORTE bit 2 / chip select / analog input 7 |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 14 | OSC2/CLKOUT — Oscillator crystal 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 PWM output |
| Pin 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 19 | RD0/PSP0 — PORTD bit 0 / parallel slave port data |
| Pin 20 | RD1/PSP1 — PORTD bit 1 / parallel slave port data |
| Pin 21 | RD2/PSP2 — PORTD bit 2 / parallel slave port data |
| Pin 22 | RD3/PSP3 — PORTD bit 3 / parallel slave port data |
| 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 TX / USART clock |
| Pin 26 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Pin 27 | RD4/PSP4 — PORTD bit 4 / parallel slave port data |
| Pin 28 | RD5/PSP5 — PORTD bit 5 / parallel slave port data |
| Pin 29 | RD6/PSP6 — PORTD bit 6 / parallel slave port data |
| Pin 30 | RD7/PSP7 — PORTD bit 7 / parallel slave port data |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply voltage |
| Pin 33 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Pin 34 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Pin 35 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Pin 36 | RB3/CCP2 — PORTB bit 3 / CCP2 output (alternate) |
| Pin 37 | RB4 — PORTB bit 4 |
| Pin 38 | RB5/PGM — PORTB bit 5 / LVP programming |
| Pin 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 40 | RB7/PGD — PORTB bit 7 / ICSP data |
| 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
PIC18LF442-I/L is suitable for 6 applications: Industrial Automation Controllers, Smart Metering and Energy Monitoring, HVAC Control Panels, Automotive Body Electronics, Consumer Appliance Control, Sensor Interface and Data Acquisition Nodes.
Industrial Automation Controllers
The PIC18LF442-I/L is a strong fit for industrial automation controllers thanks to its 34 digital I/O lines and 2.0-5.5 V wide supply range that tolerates 24 V-sourced rails after regulation. The 10-bit ADC (up to 8 channels) handles analog sensor inputs like temperature, pressure, and flow without an external ADC, and the on-chip USART plus MSSP (SPI/I2C) talk directly to industrial sensor modules, EEPROMs, and HMI displays. The 10 MIPS throughput drives PID control loops at multi-kHz rates, and the 40 MHz clock supports deterministic CAN-style timing when used with external transceivers. Industrial-temperature grade (-40 C to +85 C) ensures reliable operation in factory cabinets, while ICSP enables firmware updates on the production line.
Recommended
Smart Metering and Energy Monitoring
For smart metering, the PIC18LF442-I/L combines 16 KB flash for metering firmware, 768 bytes RAM for buffer and tariff logic, and 256 bytes EEPROM for non-volatile register storage (kWh, peak demand, time-of-use data). The extended 2.0 V minimum VDD allows direct operation from lithium-thionyl-chloride primary cells without a boost converter, increasing battery life for AMR (Automatic Meter Reading) endpoints. The 10-bit ADC samples current transformers and voltage dividers with adequate resolution for Class 1 metering when paired with appropriate CT conditioning. The USART interfaces with PLC modems or RF modules like Sub-GHz transceivers for AMI backhaul, and ICSP permits field firmware upgrades across utility fleet deployments.
Recommended
HVAC Control Panels
The PIC18LF442-I/L is well-suited to HVAC control panel controllers because the 34 I/O lines drive multiplexed seven-segment or LCD displays, keypads, and multiple relay outputs for fan, compressor, and damper control. The Capture/Compare/PWM modules generate control signals for variable-speed blower motors and triac-fired heater stages, while the analog comparators provide zero-crossing detection for synchronous triac triggering that minimizes EMI. The 16 KB flash holds control logic plus lookup-table-based temperature compensation, and the USART bridges to wireless thermostats or building-automation networks. Wide supply tolerance (2.0-5.5 V) simplifies 24 VAC-derived power designs after rectification, and the industrial temperature grade tolerates rooftop and basement equipment environments.
Recommended
Automotive Body Electronics
In non-safety automotive body electronics such as seat controllers, mirror adjusters, ambient lighting drivers, and body control modules, the PIC18LF442-I/L offers 34 I/O lines for motor drivers and switch inputs, plus PWM for lighting dimming and mirror positioning. The 10-bit ADC reads battery voltage (through a divider) and current sense for actuator feedback, while the USART interfaces with LIN bus transceivers for body networks. The -40 C to +125 C extended temperature variant (PIC18LF442-I/L is industrial -40 to +85 C; for full AEC-Q100 automotive grade, the PIC18F442-I/L or PIC18F452 family is preferred) is suitable for cabin-mounted modules. The 44-PLCC socketed package allows depot-level repair and module replacement without board-level rework.
Recommended
Consumer Appliance Control
Consumer appliances such as washing machines, dishwashers, ovens, and refrigerators use the PIC18LF442-I/L as the central controller where the 16 KB flash holds user-interface logic plus motor-control algorithms and the 768 byte RAM buffers sensor data and user settings. The 10-bit ADC reads temperature (NTC thermistors), water level, motor current, and door-switch state, while the PWM outputs drive triacs for heater elements, triac-fired valves, and brushless-DC motor drivers. The 2.0 V minimum VDD is useful for low-voltage standby rails that keep the RTC running during mains brownouts. ICSP support allows factory calibration plus field firmware updates for brand differentiation and post-launch bug fixes.
Recommended
Sensor Interface and Data Acquisition Nodes
The PIC18LF442-I/L serves as a sensor hub in distributed data-acquisition systems, where its 8-channel 10-bit ADC digitizes multiple sensors (temperature, humidity, pressure, gas) and its I2C/SPI MSSP port collects digital sensor data from external modules like accelerometers or CO2 sensors. The 768 byte RAM buffers sensor bursts before USART transmission to a host controller or wireless module, and the 2.0 V minimum VDD enables 3.3 V battery operation with months of battery life thanks to the PIC18LF sleep modes. The 40 MHz clock supports 100 kHz I2C Fast-mode and SPI up to several MHz, while the industrial temperature range handles outdoor and factory deployments.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF442-I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F442-I/L | PIC18LF442T-I/L | PIC18LF452-I/L | PIC18F452-I/L |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same |
| Flash Memory | 16 KB | 16 KB | 16 KB | 32 KB (+100%) | 32 KB (+100%) |
| RAM | 768 bytes | 768 bytes | 768 bytes | 1536 bytes (+100%) | 1536 bytes (+100%) |
| Maximum Clock | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Supply Voltage | 2.0 V to 5.5 V (LF) | 4.2 V to 5.5 V (F) | 2.0 V to 5.5 V (LF) | 2.0 V to 5.5 V (LF) | 4.2 V to 5.5 V (F) |
| I/O Pins | 34 | 34 | 34 | 34 | 34 |
| ADC | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels |
| Packaging Format | Tube | Tube | Tape & Reel | Tube | Tube |
Key Differentiators
- Wider low-voltage operating range (vs PIC18F442-I/L)
- More flash and RAM than other 44-PLCC 442 siblings (vs PIC18LF442T-I/L (same 16 KB flash / 768 B RAM))
- 44-PLCC socketed package enables field replacement (vs Tighter footprint PIC18LF26K22-I/SO (SOIC-28))
Design Notes
Place 100 nF ceramic decoupling capacitors within 5 mm of each VDD/VSS pair (pins 11/12 and 31/32) to suppress switching noise from the core. Add a bulk 10 uF tantalum or aluminum electrolytic capacitor near the PLCC socket for transient load handling, especially when driving high-current loads through PORTB or PORTD. The wide 2.0-5.5 V supply range of the LF variant enables direct battery operation, but verify BOR threshold (BOREN bit) matches the lowest expected battery voltage to avoid spurious resets during brownout.
For 44-PLCC designs, use a through-hole PLCC socket (e.g., 3M 8444-21B1-RK-TP) to enable socketed prototyping, field replacement, and easy in-circuit programming. If surface-mount is required, use a 44-PLCC SMT pad pattern that matches standard PLCC land geometry. Keep the oscillator traces (OSC1/OSC2, pins 13/14) short and isolated from digital switching lines; place the crystal or resonator within 10 mm of the OSC pins and guard the traces with a ground pour to reduce EMI susceptibility.
The most common bring-up failures on PIC18F devices are (1) CONFIG word mismatches where oscillator mode (HS vs XT vs RC) is incorrect for the chosen crystal, (2) MCLR/VPP pin left floating instead of pulled high with a 10 kohm resistor (or direct to VDD for non-reset designs), and (3) PGC/PGD pins (RB6/RB7) used as outputs before disabling Low-Voltage Programming in CONFIG4L. Always program CONFIG words first in MPLAB X before any code execution, and verify ICSP connection during prototype bring-up with a known-good programmer like PICkit 4.
Separate analog and digital ground planes when using the 10-bit ADC, with a single-point connection (star ground) near the MCU VSS pin to avoid digital return currents corrupting the analog reference. Use AVREF+ and AVREF- (RA3/RA2 or dedicated pins) for the ADC reference rather than VDD when high absolute accuracy is required, especially if VDD is shared with switching loads. The ADC sample-and-hold acquisition time must be calculated using TACQ from the datasheet, typically requiring ADCON2 to be set correctly for the chosen ADC clock source.
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature grade (-40 C to +85 C) only - not AEC-Q100 qualified for automotive safety applications; for AEC-Q100 designs use PIC18F family variants qualified for automotive.
