PIC18LF442T-I/ML - 8-bit MCU, 16KB FLASH, 40MHz, 44-QFN | Microchip
Référence : PIC18LF442T-I/ML ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $6.42 | $6,42 |
| 10 | $5.78 | $57,80 |
| 100 | $5.1 | $510,00 |
| 500 | $4.55 | $2 275,00 |
| 1 000 | $4.02 | $4 020,00 |
PIC18LF442T-I/ML Présentation
What is a PIC18 microcontroller? A PIC18 is an 8-bit microcontroller from Microchip Technology's PICmicro family using a Harvard architecture RISC core with a 16-bit instruction word and 8-bit data path. The PIC18 sits at the upper tier of the 8-bit PIC family, offering enhanced peripherals, C-optimized architecture, and self-programmability. Within the broader taxonomy: PIC18 -> 8-bit MCU -> microcontroller -> embedded controller -> semiconductor IC. The 'LF' prefix designates the low-voltage, low-power variant supporting 2.0V to 5.5V operation, while 'F' variants typically require 4.2V to 5.5V.
Key features include 34 digital I/O pins, 10-bit multi-channel ADC, Capture/Compare/PWM (CCP) modules, two 8-bit and three 16-bit timers, USART, MSSP (SPI/I2C), 256 bytes of EEPROM, and an external oscillator interface up to 40MHz. The integrated nanoWatt technology provides power-managed modes for sleep, idle, and peripheral operation at microamp currents. The device supports In-Circuit Serial Programming (ICSP) and In-Circuit Debugger (ICD).
The PIC18LF442 implements a modified Harvard architecture with a 16-bit program bus and an 8-bit data bus, achieving 10 MIPS at 40MHz. The 31-level hardware stack, 32 interrupt vectors, and 75 instructions (83 with extended instruction set) provide efficient C code generation. The 44-QFN (ML) package offers compact PCB integration with an exposed thermal pad for improved thermal dissipation.
Typical applications include industrial control, low-power sensor nodes, HVAC thermostat controllers, battery chargers, automotive body electronics (non-safety), home appliances, and USB device interfaces. The wide operating voltage and low-power modes make it well-suited for energy-harvesting designs.
When designing with this MCU, ensure the ICSP programming header follows Microchip's 6-pin layout (PGM/RB7, PGC/RB6, VPP/MCLR, VDD, VSS, NC). The 44-QFN package requires careful PCB land pattern design; refer to Microchip package drawings for proper thermal pad soldering.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.
Alternatives de remplacement direct pour PIC18LF442T-I/ML — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec PIC18LF442T-I/ML (même facteur de forme et même empreinte) — différant par ADC, Package, Timers, Core Architecture, Mounting Type.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
PIC18LF442-I/ML
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
PIC18LF4420T-I/ML
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$3.79 / unité
Voir la fiche technique →PIC18LF4320T-I/ML
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$4.68 / unité
Voir la fiche technique →PIC18LF4520T-I/ML
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
PIC18LF452-I/ML
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
PIC18LF4410T-I/ML
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$3.79 / unité
Voir la fiche technique →PIC18LF442T-I/ML Valeurs maximales et caractéristiques électriques
| Core Architecture | PIC18 8-bit RISC |
| Program Memory (FLASH) | 16 KB (8K x 16) |
| RAM Size | 768 bytes |
| EEPROM Size | 256 bytes |
| Maximum CPU Frequency | 40 MHz |
| Operating Voltage (LF variant) | 2.0 V to 5.5 V |
| Number of I/O Pins | 34 |
| ADC | 10-bit multi-channel |
| Timers | 2 x 8-bit, 3 x 16-bit |
| Communication Interfaces | USART, MSSP (SPI/I2C) |
| CCP/ECCP Modules | Yes (Capture/Compare/PWM) |
| Boîtier | 44-QFN (ML) 8x8 mm with thermal pad |
| Type de montage | Surface Mount |
| Température de fonctionnement | -40C to +85C (Industrial) |
| Statut RoHS | Compliant |
| Programming | ICSP (In-Circuit Serial Programming) |
Configuration des broches de PIC18LF442T-I/ML
| Broche 1 | OSC1/RA7 — External oscillator input / GPIO |
| Broche 2 | OSC2/RA6 — External oscillator output / GPIO |
| Broche 3 | MCLR — Master Clear (reset) input, programming voltage |
| Broche 4 | RA0/AN0 — GPIO / Analog input 0 |
| Broche 5 | RA1/AN1 — GPIO / Analog input 1 |
| Broche 6 | RA2/AN2/VREF- — GPIO / Analog input 2 / ADC VREF- |
| Broche 7 | RA3/AN3/VREF+ — GPIO / Analog input 3 / ADC VREF+ |
| Broche 8 | RA4/T0CKI — GPIO / Timer0 clock input |
| Broche 9 | RA5/AN4/SS — GPIO / Analog input 4 / SPI slave select |
| Broche 10 | VSS — Ground |
| Broche 11 | VDD — Positive supply voltage |
| Broche 12 | RB0/INT0 — GPIO / External interrupt 0 |
| Broche 13 | RB1/INT1 — GPIO / External interrupt 1 |
| Broche 14 | RB2/INT2 — GPIO / External interrupt 2 |
| Broche 15 | RB3/CCP2 — GPIO / Capture/Compare/PWM 2 |
| Broche 16 | RB4 — GPIO |
| Broche 17 | RB5/PGM — GPIO / LVP programming |
| Broche 18 | RB6/PGC — GPIO / ICSP clock |
| Broche 19 | RB7/PGD — GPIO / ICSP data |
| Broche 20 | VSS — Ground |
| Broche 21 | VDD — Positive supply voltage |
| Broche 22 | RC0/T1OSO — GPIO / Timer1 oscillator output |
| Broche 23 | RC1/T1OSI/CCP2 — GPIO / Timer1 oscillator input / CCP2 |
| Broche 24 | RC2/CCP1 — GPIO / Capture/Compare/PWM 1 |
| Broche 25 | RC3/SCK/SCL — GPIO / SPI clock / I2C clock |
| Broche 26 | RC4/SDI/SDA — GPIO / SPI data in / I2C data |
| Broche 27 | RC5/SDO — GPIO / SPI data out |
| Broche 28 | RC6/TX/CK — GPIO / USART TX / USART clock |
| Broche 29 | RC7/RX/DT — GPIO / USART RX / USART data |
| Broche 30 | VSS — Ground |
| Broche 31 | VDD — Positive supply voltage |
| Broche 32 | RD0 — GPIO |
| Broche 33 | RD1 — GPIO |
| Broche 34 | RD2 — GPIO |
| Broche 35 | RD3 — GPIO |
| Broche 36 | RD4 — GPIO |
| Broche 37 | RD5 — GPIO |
| Broche 38 | RD6 — GPIO |
| Broche 39 | RD7 — GPIO |
| Broche 40 | VSS — Ground |
| Broche 41 | VDD — Positive supply voltage |
| Broche 42 | RE0/RD — GPIO / Parallel slave port read |
| Broche 43 | RE1/WR — GPIO / Parallel slave port write |
| Broche 44 | RE2/CS — GPIO / Parallel slave port chip select |
Applications typiques
PIC18LF442T-I/ML convient pour 6 applications: Industrial Control Systems, Battery-Powered Sensor Nodes, HVAC Thermostat Controllers, Home Appliance Controllers, USB-to-Serial Bridge Devices, Automotive Body Electronics (Non-Safety).
Industrial Control Systems
The PIC18LF442T-I/ML is well-suited for industrial control applications because its 40MHz core delivers 10 MIPS, providing deterministic real-time response for PLC and motor control loops. The 16KB FLASH accommodates C-based state machine firmware while 768B RAM handles communication buffers. The wide 2.0V-5.5V supply range tolerates industrial voltage transients and 24V-referenced rails post-regulation. The 34 I/O pins drive relays, opto-isolators, and H-bridge signals directly. The 10-bit ADC with multiple channels reads sensor inputs including temperature, pressure, and current sensing. Compared to 5V-only PIC18F variants, the LF442's 2.0V minimum extends operation to 3.3V industrial backplanes without level shifters.
Recommandé
Battery-Powered Sensor Nodes
The PIC18LF442T-I/ML excels in battery-powered sensor nodes due to its low-voltage 2.0V operation that allows direct connection to 2x AA alkaline or single Li-ion cells without boost converters. The nanoWatt technology provides sleep currents below 1 microamp, extending battery life to multi-year durations for intermittent-duty sensors. The integrated 10-bit ADC captures temperature, humidity, and analog sensor data without external converters. The 256-byte EEPROM stores calibration constants and node identity across power cycles. The 16KB FLASH accommodates Bluetooth/Zigbee stack code or custom Modbus RTU protocols. Compared to 5V-only PIC18F442, the LF442 saves a boost converter in 3V battery systems.
Recommandé
HVAC Thermostat Controllers
The PIC18LF442T-I/ML fits HVAC thermostat controllers with its 34 I/O pins directly driving seven-day programmable LCD interfaces, relay outputs for compressor/fan control, and triac firing circuits. The 40MHz core executes PID control loops at sub-second intervals, maintaining temperature stability within +/- 0.5C. The integrated 10-bit ADC reads thermistor inputs and the on-chip EEPROM retains user schedule settings through power interruptions. The 2.0V-5.5V range supports both 24VAC-referenced and battery backup supplies common in HVAC systems. The industrial -40C to +85C temperature rating tolerates equipment closet environments. Compared to higher-end PIC18K-series parts, the LF442 provides right-sized peripherals at lower cost.
Recommandé
Home Appliance Controllers
The PIC18LF442T-I/ML powers home appliance controllers including washing machines, dishwashers, and microwave ovens where the 8-bit PIC18 architecture provides proven reliability and cost-effectiveness. The CCP/ECCP modules generate PWM signals for motor speed control and triac phase-angle dimming. The USART interfaces to LED display drivers and mechanical encoder inputs. The 16KB FLASH holds appliance firmware with diagnostic routines while 256B EEPROM stores cycle settings and error logs. The 2.0V-5.5V supply range accommodates rectified mains-derived 5V and 3.3V rails. Compared to ARM Cortex-M0 alternatives, the LF442 offers lower cost and longer-term Microchip supply commitment for high-volume appliance production.
Recommandé
USB-to-Serial Bridge Devices
While the PIC18LF442T-I/ML itself lacks USB hardware, it functions as the UART-side controller in USB-to-serial bridge applications when paired with a USB-UART IC such as MCP2200 or MCP2221. The 40MHz core handles UART baud rate generation up to 921.6kbps with low error. The MSSP peripheral provides I2C/SPI for sensor aggregation forwarded over USB. The 16KB FLASH accommodates CDC class driver emulation firmware for non-USB PIC18 designs using bit-banged USB via the MSSP or CCP modules. The 2.0V-5.5V supply range simplifies 3.3V USB bridge designs. Compared to PIC18F4550 with native USB, this approach trades software complexity for the LF442's lower cost and wider voltage range.
Recommandé
Automotive Body Electronics (Non-Safety)
The PIC18LF442T-I/ML fits non-safety automotive body electronics including seat controllers, mirror adjusters, and interior lighting where the -40C to +85C industrial temperature range matches cabin environments. The 34 I/O pins drive multiple LED strings, H-bridge motor drivers, and CAN/LIN transceivers via MSSP or USART. The wide 2.0V-5.5V supply tolerates 12V automotive battery transients after regulation. The 16KB FLASH holds body controller firmware with LIN slave protocol stacks. Note that this is the non-Q100 part; for safety-critical applications, use AEC-Q100-qualified variants from the PIC18F family. Compared to AEC-Q100 parts, the LF442 saves cost for non-safety body modules.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour PIC18LF442T-I/ML — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | PIC18LF442-I/ML | PIC18LF4420T-I/ML | PIC18LF4320T-I/ML | PIC18LF4520T-I/ML |
|---|---|---|---|---|---|
| Package | 44-QFN (ML) 8x8 mm | 44-QFN (ML) 8x8 mm - same | 44-QFN (ML) 8x8 mm - same | 44-QFN (ML) 8x8 mm - same | 44-QFN (ML) 8x8 mm - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| FLASH Memory | 16 KB | 16 KB | 16 KB | 8 KB (-50%) | 32 KB (+100%) |
| RAM Size | 768 bytes | 768 bytes | 768 bytes | 512 bytes (-33%) | 1536 bytes (+100%) |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Maximum Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| I/O Pins | 34 | 34 | 36 | 34 | 34 |
| CAN Bus Support | No | No | No | No | Yes |
Principaux différenciateurs
- Low-voltage 2.0V operation with nanoWatt power management (vs PIC18F442 (5V-only variant))
- Industry-standard PIC18 instruction set with extensive toolchain support (vs PIC18F4550 (with USB))
- Pin-compatible upgrade path to enhanced PIC18LF4520 (vs PIC18LF4320T-I/ML (8KB FLASH variant))
- No CAN bus peripheral - requires external MCP2515 for CAN networks (vs PIC18LF452 (with CAN))
Notes de conception
The PIC18LF442T-I/ML supports 2.0V-5.5V operation, but decoupling must be placed within 5mm of each VDD/VSS pair. Use a 100nF ceramic capacitor on each VDD pin plus a single 10uF bulk capacitor near the package. For battery applications, add a 100kohm pull-down on MCLR to prevent leakage through the internal weak pull-up during sleep modes. The nanoWatt sleep current is below 1uA but only when peripherals are properly disabled in firmware before executing the SLEEP instruction.
The 44-QFN (ML) package has an exposed thermal pad on the bottom that MUST be soldered to the PCB ground plane for mechanical reliability and thermal dissipation. The land pattern should follow Microchip package drawing C04-148 for 8mm QFN with 0.4mm pitch. Use a via array (0.3mm vias on 1mm grid) under the thermal pad to conduct heat to internal ground planes. Solder paste stencil aperture should be 1:1 to land pattern with the thermal pad aperture reduced to ~50% to prevent solder starvation.
Do not confuse PIC18LF442 with PIC18F442 - the LF variant requires 2.0V minimum while F variant requires 4.2V minimum. Configuring a 3.3V system with F442 will cause erratic FLASH writes. When migrating firmware from PIC18F452 to PIC18LF442, verify the CONFIG register low-voltage programming (LVP) bit setting. Additionally, ensure the ICSP header connects PGC (RB6) and PGD (RB7) correctly - swapped connections appear as a working programmer that fails verification mid-flash. Always include a 10kohm pull-up on MCLR.
Route the oscillator traces (OSC1/OSC2) with ground guarding and keep traces under 10mm to minimize EMI and crosstalk. For 40MHz operation, place a series damping resistor (100-470 ohm) close to the MCU on OSC2 if EMI is observed. Separate analog AVdd/AVss pins (shared with VDD/VSS on this package) require a ferrite bead or pi-filter when ADC is used in noisy environments. The CCP/PWM outputs can drive triacs directly but require 100 ohm series resistors for gate protection.
When using the MSSP peripheral in SPI mode at high speeds (above 5MHz), ensure SCK trace length matches the data trace lengths to within 5mm to prevent skew. For I2C, calculate the pull-up resistor value based on bus capacitance: R_pullup <= 1.8us / (C_bus * 1.2) for standard mode. The USART in synchronous mode requires separate routing for TX/RX/CLK with ground guards for noise immunity at baud rates above 115.2kbps.
Informations de conformité
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - choose PIC18F452-I/ML automotive variants for AEC-Q100 requirements. Lead-free and halogen-free per Microchip material declaration.
