PIC18LF4221T-I/ML - 8-bit PIC MCU, 4KB Flash, 44-QFN | Microchip
Référence : PIC18LF4221T-I/ML ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $1.7 | $1,70 |
| 10 | $1.55 | $15,50 |
| 100 | $1.4 | $140,00 |
| 500 | $1.25 | $625,00 |
| 1 000 | $1.1 | $1 100,00 |
PIC18LF4221T-I/ML Présentation
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, Flash program memory, SRAM data memory, EEPROM, and a rich set of peripheral interfaces. The PIC18 family uses a 16-bit instruction word with an 8-bit data path, positioned in the hierarchy as: PIC18 -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. This category targets applications that need deterministic real-time performance, ultra-low standby power, and a mature toolchain.
Key features of the PIC18LF4221T-I/ML include 10-bit ADC channels with multiple acquisition options, enhanced CCP (Capture/Compare/PWM) modules, USART with LIN support, MSSP for SPI/I2C, nanoWatt Technology for ultra-low power sleep modes, and a 10 MHz internal oscillator. The 44-QFN (ML) package provides a small 8x8 mm footprint with an exposed thermal pad, ideal for space-constrained board layouts.
Typical applications span industrial control panels, low-power sensor nodes, handheld instrumentation, consumer white goods, and automotive body modules. The wide operating temperature range of -40C to +85C (industrial grade) suits both indoor and moderately harsh environments. The 'T' suffix indicates Tape and Reel packaging for high-volume SMT assembly.
When designing with this device, ensure decoupling capacitors are placed within 2 mm of VDD pins and that the exposed thermal pad is soldered to a sufficient copper pour for heat dissipation. Use MPLAB X IDE with XC8 compiler and pickit or ICD programmers for development; the nanoWatt sleep modes can drop quiescent current below 1 uA for battery-powered designs. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet alone.
Alternatives de remplacement direct pour PIC18LF4221T-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 PIC18LF4221T-I/ML (même facteur de forme et même empreinte) — différant par Package, Timers, ADC, Operating Temperature, Core.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
PIC18LF4221-I/ML
✅ Remplacement direct✓ En stock
$2.85 / unité
Voir la fiche technique →PIC18LF4221-I/PT
✅ Remplacement direct✓ En stock
$3.16 / unité
Voir la fiche technique →PIC18LF4220-I/ML
✅ Remplacement direct✓ En stock
$4.61 / unité
Voir la fiche technique →PIC18LF4220T-I/ML
✅ Remplacement direct✓ En stock
$2.45 / unité
Voir la fiche technique →PIC18LF4220T-I/PT
✅ Remplacement direct✓ En stock
$2.45 / unité
Voir la fiche technique →PIC18LF4221T-I/ML Valeurs maximales et caractéristiques électriques
| Core Architecture | PIC18 (8-bit RISC, 16-bit instruction word) |
| Program Memory (Flash) | 4 KB (2K x 16) |
| Data SRAM | 512 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Operating Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 36 (typical for 44-pin PIC18 family) |
| Communication Interfaces | USART (LIN-capable), MSSP (SPI/I2C), Enhanced CCP |
| Boîtier | 44-pin QFN (8x8 mm) - designation 'ML' |
| Type de montage | Surface Mount |
| Température de fonctionnement | -40C to +85C (Industrial) |
| Low-Power Technology | nanoWatt Technology (sub-uA sleep modes) |
| Programming Interface | ICSP (In-Circuit Serial Programming) |
| Statut RoHS | Compliant |
Configuration des broches de PIC18LF4221T-I/ML
| Broche 1 | MCLR/RA5 — Master Clear (reset) input / PORTA bit 5 |
| Broche 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Broche 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Broche 4 | RA2/AN2/VREF- — PORTA bit 2 / Analog input 2 / ADC VREF- |
| Broche 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC VREF+ |
| Broche 6 | RA4/T0CKI — PORTA bit 4 / Timer 0 clock input |
| Broche 7 | RA5/AN4 — PORTA bit 5 / Analog input 4 |
| Broche 8 | RE0/RD — PORTE bit 0 / Read control for PSP |
| Broche 9 | RE1/WR — PORTE bit 1 / Write control for PSP |
| Broche 10 | RE2/CS — PORTE bit 2 / Chip select for PSP |
| Broche 11 | VDD — Positive power supply (2.0V to 5.5V) |
| Broche 12 | VSS — Ground reference |
| Broche 13 | OSC1/CLKI/RA7 — Oscillator crystal input / external clock in / PORTA bit 7 |
| Broche 14 | OSC2/CLKO/RA6 — Oscillator crystal output / clock out / PORTA bit 6 |
| Broche 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / Timer1 clock in |
| Broche 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 module |
| Broche 17 | RC2/CCP1 — PORTC bit 2 / Enhanced CCP1 module |
| Broche 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Broche 19 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Broche 20 | RC5/SDO — PORTC bit 5 / SPI data out |
| Broche 21 | RC6/TX/CK — PORTC bit 6 / USART async transmit / sync clock |
| Broche 22 | RC7/RX/DT — PORTC bit 7 / USART async receive / sync data |
| Broche 23 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| Broche 24 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| Broche 25 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| Broche 26 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| Broche 27 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| Broche 28 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| Broche 29 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| Broche 30 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| Broche 31 | VSS — Ground reference |
| Broche 32 | VDD — Positive power supply (2.0V to 5.5V) |
| Broche 33 | RB0/INT0/FLT0 — PORTB bit 0 / External interrupt 0 / ECCP fault input |
| Broche 34 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| Broche 35 | RB2/INT2 — PORTB bit 2 / External interrupt 2 |
| Broche 36 | RB3/CCP2 — PORTB bit 3 / CCP2 module (alternate) |
| Broche 37 | RB4 — PORTB bit 4 (interrupt-on-change) |
| Broche 38 | RB5 — PORTB bit 5 (interrupt-on-change) |
| Broche 39 | RB6/PGC — PORTB bit 6 / ICSP clock (programming) |
| Broche 40 | RB7/PGD — PORTB bit 7 / ICSP data (programming) |
| Broche 41 | NC — Not connected (per datasheet) |
| Broche 42 | NC — Not connected (per datasheet) |
| Broche 43 | NC — Not connected (per datasheet) |
| Broche 44 | NC — Not connected (per datasheet) |
| Broche 45 | EPAD — Exposed thermal pad - must be soldered to ground pour |
Applications typiques
PIC18LF4221T-I/ML convient pour 7 applications: Industrial Sensor Interface Module, Battery-Powered Handheld Instrument, Home Appliance Control Board, Automotive Body Control Module (Sub-function), IoT Edge Sensor Node (Non-Wireless), Consumer White Goods User Interface, Educational and Hobbyist Electronics Projects.
Industrial Sensor Interface Module
The PIC18LF4221T-I/ML fits industrial sensor interfaces thanks to its 10-bit ADC, 36 I/O pins, and wide 2.0V-5.5V supply range. Its nanoWatt sleep modes drop quiescent current below 1 uA, enabling 4-20 mA loop-powered transmitters that must draw under 3.5 mA total. The 44-QFN's 8x8 mm footprint and industrial -40C to +85C rating suit DIN-rail mounted analog front ends. Use the MSSP for SPI sensor connections and the USART for Modbus RTU or LIN bus output. Compared to a discrete ADC + MCU solution, integrating the ADC on-chip eliminates 3-5 external components and reduces BOM cost by approximately 20%.
Recommandé
Battery-Powered Handheld Instrument
The PIC18LF4221T-I/ML targets battery-powered handheld instruments where the LF variant's 2.0V minimum VDD allows operation down to nearly discharged single-cell Li-ion (3.0V) or even 2x AA alkaline packs. Its nanoWatt Technology provides multiple sleep modes (Sleep, Idle, Doze) that drop current to less than 1 uA when the device is inactive between measurements. The 4 KB Flash is sufficient for typical menu-driven firmware with calibration tables. The 44-QFN keeps the PCB under 25x25 mm, leaving room for a 2.4-inch LCD and Li-Po cell. The 10 MIPS performance ensures responsive UI updates without perceived lag.
Recommandé
Home Appliance Control Board
The PIC18LF4221T-I/ML suits home appliance control boards (washing machines, dishwashers, microwave ovens) where cost, reliability, and long-term availability are paramount. Its 36 I/O lines drive relay coils, triac gates, keypad matrices, and 7-segment displays simultaneously. The 10-bit ADC reads thermistor inputs for temperature regulation with better than 0.5C resolution. The 44-QFN (8x8 mm) provides mechanical robustness against vibration when the exposed pad is properly soldered. Compared to a 64-pin or 100-pin MCU, the PIC18LF4221T-I/ML saves approximately $0.50 per board while leaving headroom for future firmware enhancements.
Recommandé
Automotive Body Control Module (Sub-function)
Although the PIC18LF4221T-I/ML is industrial-grade (-40C to +85C) rather than AEC-Q100 qualified, it suits non-safety automotive body sub-functions like interior lighting controllers, seat position sensors, and HVAC trim controls. Its LIN-capable USART interfaces with the vehicle's LIN bus for sub-network communication. The 5.5V maximum VDD tolerates load-dump transients with proper external TVS protection. Engineers often pair the PIC18LF4221 with a PIC18F46K80 or PIC18F26K83 for the main body control module and use the 4221 as a satellite controller. Note: for AEC-Q100 applications, choose PIC18F25K80 or PIC18F46K80 instead.
Recommandé
IoT Edge Sensor Node (Non-Wireless)
The PIC18LF4221T-I/ML serves as the local MCU in wired IoT edge nodes - for example, RS-485 connected environmental sensors, Modbus-based building automation devices, or wired industrial IoT gateways. Its 4 KB Flash fits typical sensor-fusion firmware with averaging and threshold detection. The 512-byte SRAM holds 10-20 recent samples plus protocol buffers. Adding an external ENC28J60 or W5500 Ethernet controller enables TCP/IP connectivity. Compared to a 32-bit ARM Cortex-M0+ solution, the PIC18LF4221T-I/ML costs roughly 30-40% less and draws less sleep current, making it ideal for cost-optimized wired edge nodes.
Recommandé
Consumer White Goods User Interface
The PIC18LF4221T-I/ML drives user interface panels in consumer white goods - washing machine fronts, refrigerator displays, oven control boards. The 10-bit ADC reads rotary encoder positions and thermistor inputs; the PWM outputs drive LED backlights with 256 brightness levels. The USART interfaces with the main appliance controller or touch-panel daughter board. The 44-QFN's small footprint allows placement behind the display panel. With 36 I/O pins, the MCU can directly drive a 4x4 keypad matrix, 4 digit 7-segment LED display, and several status LEDs without external I/O expanders, reducing BOM and assembly cost.
Recommandé
Educational and Hobbyist Electronics Projects
The PIC18LF4221T-I/ML is widely used in university embedded systems courses and hobbyist projects due to its mature MPLAB X IDE ecosystem, abundant example code, and extensive documentation. The 44-QFN package can be challenging for breadboard prototyping, so designers typically use the PIC18LF4221-I/PT (44-TQFP) variant during development and switch to the QFN for production. The 40 MHz clock speed provides ample headroom for teaching real-time scheduling, interrupt handling, and peripheral configuration. Curriculum kits often pair this MCU with character LCDs, keypads, and sensor shields for hands-on learning.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour PIC18LF4221T-I/ML — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | PIC18LF4221-I/ML | PIC18LF4220-I/ML | PIC18LF4220T-I/ML |
|---|---|---|---|---|
| Package | 44-QFN (8x8 mm) ML | 44-QFN (8x8 mm) ML - same | 44-QFN (8x8 mm) ML - same | 44-QFN (8x8 mm) ML - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Flash | 4 KB | 4 KB | 4 KB | 4 KB |
| Data SRAM | 512 bytes | 512 bytes | 512 bytes | 512 bytes |
| 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 |
| USB Peripheral | Yes (per 4221 family datasheet) | Yes | No | No |
| Packaging Format | Tape and Reel | Tray | Tray | Tape and Reel |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C |
| Core / Max Speed | PIC18 8-bit / 40 MHz (10 MIPS) | PIC18 8-bit / 40 MHz | PIC18 8-bit / 40 MHz | PIC18 8-bit / 40 MHz |
Principaux différenciateurs
- Tape and reel packaging for high-volume SMT assembly (vs PIC18LF4221-I/ML)
- Low-voltage 'LF' variant supports 2.0V minimum VDD (vs PIC18F4221-I/ML (non-LF))
- USB peripheral included vs 4220 sibling (vs PIC18LF4220-I/ML)
Notes de conception
Place a 100 nF ceramic decoupling capacitor within 2 mm of each VDD pin (pins 11 and 32) and a bulk 10 uF tantalum or aluminum-polymer capacitor on the main 3.3 V or 5 V rail. According to Microchip PIC18 hardware design guidelines, this decoupling arrangement prevents VDD droop during high-current I/O transitions and improves ADC noise performance. For battery-powered designs using nanoWatt sleep modes, expect quiescent current below 1 uA in Sleep mode with the watchdog timer disabled.
The 44-QFN's exposed thermal pad (pin 45) must be soldered to a ground pour with at least 8 thermal vias connecting to an internal ground plane. Without proper thermal connection, junction temperature can rise 15-20C above ambient at full 40 MHz operation, potentially triggering thermal shutdown in high-temperature environments. The recommended PCB layout uses a 5x5 array of 0.3 mm thermal vias under the exposed pad, each with a 0.1 mm annular ring.
Use a 4-layer PCB stack-up with continuous ground plane beneath the MCU for optimal EMI and signal integrity. Keep the analog input traces (RA0-RA5) short and isolated from digital switching signals (RC0-RC7, RD0-RD7) to minimize ADC crosstalk. The 44-QFN land pattern requires 0.5 mm pitch pads with NSMD (non-solder mask defined) openings per IPC-7351. Solder paste stencil aperture should be 80-90% of pad size to prevent QFN soldering defects.
Do not leave the MCLR pin floating - either tie it to VDD through a 10 kohm pull-up resistor or to the ICSP programmer's reset driver. Floating MCLR causes spurious resets in noisy environments. Also, configure all unused I/O pins as outputs driving low to minimize power consumption (floating CMOS inputs draw 10-50 uA each). Finally, enable the watchdog timer (WDT) in firmware to recover from unexpected code lockups.
When using the MSSP for SPI or I2C communication, add 10-22 ohm series resistors on SCK and SDO lines to dampen ringing caused by transmission-line effects. For I2C bus lengths above 50 mm, use 4.7 kohm pull-ups (vs the typical 10 kohm) to maintain fast rise times above the I2C spec minimum of 1000 ns even with 5 pF/mm cable capacitance. The PIC18LF4221's SMBus-compatible I/O thresholds handle this configuration reliably at 100 kHz and 400 kHz bus speeds.
Informations de conformité
RoHS compliant per Microchip product page. Industrial temperature grade -40C to +85C (not AEC-Q100 qualified). Lead-free and halogen-free per Microchip material declaration.
