PIC18F4221T-I/ML - 8-bit PIC MCU 4KB Flash 40MHz 44-QFN | Microchip
Référence : PIC18F4221T-I/ML ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $4.2 | $4,20 |
| 10 | $3.78 | $37,80 |
| 100 | $3.36 | $336,00 |
| 500 | $2.95 | $1 475,00 |
| 1 000 | $2.55 | $2 550,00 |
PIC18F4221T-I/ML Présentation
An 8-bit microcontroller is a programmable system-on-a-chip that combines a CPU core, memory, and peripherals on a single silicon die. PIC microcontrollers (Programmable Intelligent Controllers) use a Harvard RISC architecture with only 77 single-word instructions, making them easy to program while delivering deterministic real-time performance. PIC18F family parts sit in the mid-range tier of the PIC portfolio, above baseline PIC16 and below PIC24/dsPIC, and are widely deployed in consumer, industrial, and automotive subsystems.
Key features of the PIC18F4221 include 10 MIPS throughput, self-programmable Flash, an internal oscillator block, and a 10-bit ADC with up to 13 channels. It also supports multiple communication interfaces - I2C, SPI, and UART/USART - enabling easy integration with sensors, displays, and wireless modules. The integrated nanoWatt power management reduces quiescent current in sleep modes.
The device uses Microchip's enhanced PIC18 architecture with a 16-bit wide instruction word and an 8-bit data path, providing code density comparable to 16-bit cores while preserving 8-bit pricing. The 44-QFN package exposes up to 36 I/O pins and supports in-circuit serial programming (ICSP) plus in-circuit debugging via two pins, allowing field firmware updates and on-board debug without removing the MCU.
Typical applications include industrial control systems, sensor interface modules, small appliance controls, automotive body electronics, and low-cost consumer devices. The combination of low power, ample peripherals, and the PIC18 instruction set makes it a strong fit for cost-sensitive embedded designs.
When designing with this part, plan for proper decoupling (100 nF on VDD close to each VDD pin plus a bulk 10 uF), use the internal RC oscillator when crystal accuracy is not critical, and leverage the nanoWatt sleep modes for battery-powered applications. Always reference the Microchip PIC18F4221 datasheet (DS39631) for errata and AC/DC timing.
This page synthesizes distributor pricing, parametric alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single decision-ready reference.
Alternatives de remplacement direct pour PIC18F4221T-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 PIC18F4221T-I/ML (même facteur de forme et même empreinte) — différant par Package, ADC, Core Architecture, Timers, I/O Pins.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
PIC18F4221-I/ML
✅ Remplacement direct✓ En stock
$3.5 / unité
Voir la fiche technique →PIC18F4220T-I/ML
✅ Remplacement direct✓ En stock
$3.64 / unité
Voir la fiche technique →PIC18F4221T-I/PT
✅ Remplacement direct✓ En stock
$1.82 / unité
Voir la fiche technique →PIC18F4321T-I/ML
✅ Remplacement direct✓ En stock
$4.1 / unité
Voir la fiche technique →PIC18F4421T-I/ML
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
PIC18F4520T-I/ML
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
PIC18F4221T-I/ML Valeurs maximales et caractéristiques électriques
| Core Architecture | PIC18 (8-bit, Harvard RISC) |
| Instruction Set | 77 single-word instructions |
| Max CPU Speed | 40 MHz (10 MIPS) |
| Program Memory (Flash) | 4 KB (2K x 16) |
| Data RAM | 512 bytes |
| Data EEPROM | 256 bytes |
| I/O Pins | Up to 36 |
| ADC | 10-bit, up to 13 channels |
| Communication Interfaces | I2C, SPI, UART/USART |
| Timers | Multiple 8-bit and 16-bit timers |
| Boîtier | 44-pin QFN (8x8 mm) |
| Type de montage | Surface Mount |
| Température de fonctionnement | -40C to +85C (Industrial) |
| Tension d'alimentation | 2.0 V to 5.5 V |
| ICSP / ICD | Yes (In-Circuit Serial Programming and Debug) |
| Statut RoHS | Compliant |
| Lead-Free | Yes |
Configuration des broches de PIC18F4221T-I/ML
| Broche 1 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Broche 2 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Broche 3 | RA2/AN2/VREF- — Digital I/O / Analog input / ADC VREF- |
| Broche 4 | RA3/AN3/VREF+ — Digital I/O / Analog input / ADC VREF+ |
| Broche 5 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Broche 6 | RA5/AN4/SS — Digital I/O / Analog input / SPI slave select |
| Broche 7 | RA6 — Digital I/O / oscillator pin |
| Broche 8 | OSC1/CLKI/RA7 — Crystal oscillator input / external clock in |
| Broche 9 | OSC2/CLKO/RA6 — Crystal oscillator output |
| Broche 10 | VSS — Ground reference |
| Broche 11 | VDD — Positive supply (2.0 V to 5.5 V) |
| Broche 12 | RB0/INT0 — Digital I/O / External interrupt 0 |
| Broche 13 | RB1/INT1 — Digital I/O / External interrupt 1 |
| Broche 14 | RB2/INT2 — Digital I/O / External interrupt 2 |
| Broche 15 | RB3/INT3 — Digital I/O / External interrupt 3 |
| Broche 16 | RB4 — Digital I/O / interrupt-on-change |
| Broche 17 | RB5 — Digital I/O / interrupt-on-change |
| Broche 18 | RB6/PGC — Digital I/O / ICSP clock |
| Broche 19 | RB7/PGD — Digital I/O / ICSP data |
| Broche 20 | VSS — Ground reference |
| Broche 21 | VDD — Positive supply (2.0 V to 5.5 V) |
| Broche 22 | RC0/T1OSO — Digital I/O / Timer1 oscillator output |
| Broche 23 | RC1/T1OSI — Digital I/O / Timer1 oscillator input |
| Broche 24 | RC2/CCP1 — Digital I/O / Capture/Compare/PWM 1 |
| Broche 25 | RC3/SCL — Digital I/O / I2C clock |
| Broche 26 | RC4/SDA — Digital I/O / I2C data |
| Broche 27 | RC5 — Digital I/O |
| Broche 28 | RC6/TX/CK — Digital I/O / UART TX / USART clock |
| Broche 29 | RC7/RX/DT — Digital I/O / UART RX / USART data |
| Broche 30 | VSS — Ground reference |
| Broche 31 | VDD — Positive supply (2.0 V to 5.5 V) |
| Broche 32 | RD0 — Digital I/O / Parallel port bit 0 |
| Broche 33 | RD1 — Digital I/O / Parallel port bit 1 |
| Broche 34 | RD2 — Digital I/O / Parallel port bit 2 |
| Broche 35 | RD3 — Digital I/O / Parallel port bit 3 |
| Broche 36 | RD4 — Digital I/O / Parallel port bit 4 |
| Broche 37 | RD5 — Digital I/O / Parallel port bit 5 |
| Broche 38 | RD6 — Digital I/O / Parallel port bit 6 |
| Broche 39 | RD7 — Digital I/O / Parallel port bit 7 |
| Broche 40 | VSS — Ground reference |
| Broche 41 | VDD — Positive supply (2.0 V to 5.5 V) |
| Broche 42 | RE0/RD — Digital I/O / Parallel port read control |
| Broche 43 | RE1/WR — Digital I/O / Parallel port write control |
| Broche 44 | RE2/CS — Digital I/O / Parallel port chip select |
Applications typiques
PIC18F4221T-I/ML convient pour 7 applications: Industrial Sensor Interface Module, Small Appliance Control Board, Automotive Body Electronics, IoT Edge Sensor Node, HMI Keypad and LCD Front Panel, Battery Charging Controller, Educational Trainer Board.
Industrial Sensor Interface Module
The PIC18F4221T-I/ML fits industrial sensor interfaces because it integrates a 10-bit ADC with up to 13 channels, I2C/SPI/UART peripherals for digital sensors, and runs at 10 MIPS for real-time filtering. Its 4 KB Flash stores small protocol stacks, while 512 B RAM is ample for buffer and state. The -40C to +85C industrial temperature rating covers factory environments, and the 44-QFN 8x8 mm footprint fits compact DIN-rail sensor boards. Pair it with a 4-20 mA current loop driver and an RS-485 transceiver for a complete analog front end.
Recommandé
Small Appliance Control Board
Household appliances like coffee machines, washing machines, and induction cooktops benefit from the PIC18F4221T-I/ML's 36 I/O pins for keypad, LED, relay, and triac control. Its 40 MHz speed runs PID loops for temperature regulation at 100 Hz update rates. The 256-byte EEPROM stores user preferences (brew strength, cycle count) across power cycles. nanoWatt sleep modes drop quiescent current below 1 uA in standby, helping meet energy-star idle targets. The 44-QFN package enables compact PCB designs that fit behind control panels.
Recommandé
Automotive Body Electronics
Body control modules for seat position, mirror adjustment, and interior lighting use the PIC18F4221T-I/ML for its CAN-equivalent UART communication to other ECUs and its PWM-capable I/O for motor drive. Although not AEC-Q100 qualified at the 4221 variant, the industrial temperature range handles most cabin environments. The wide 2.0 V to 5.5 V supply tolerates 12 V battery transients after regulator conditioning. Use it for non-safety functions like window lift control or ambient lighting color mixing.
Recommandé
IoT Edge Sensor Node
For low-power IoT edge sensors (temperature, humidity, occupancy), the PIC18F4221T-I/ML handles sensor polling, local averaging, and packet formatting before forwarding to a paired radio module. Its nanoWatt sleep draws less than 1 uA, enabling multi-year battery life on 2x AA cells for sensors reporting every 5 minutes. The I2C and SPI peripherals connect directly to digital sensors like the SHT30 or BME280. A UART link bridges to a Wi-Fi or LoRa module for backhaul.
Recommandé
HMI Keypad and LCD Front Panel
Human-machine interface front panels with 4x4 keypads, character LCDs, or LED indicators are well-served by the PIC18F4221T-I/ML. The 36 I/O pins handle matrix keypad scanning (8 pins), a 16x2 character LCD in 4-bit mode (6 pins), and status LEDs (8 pins) with room to spare. The 10 MIPS throughput executes debounce, key mapping, and menu navigation without latency. The compact 44-QFN package is ideal for slimmer front-panel PCBs behind glass overlays.
Recommandé
Battery Charging Controller
The PIC18F4221T-I/ML can implement CC/CV charging profiles for lead-acid, NiMH, or Li-ion packs using its ADC to monitor voltage and current. Its PWM peripherals drive a buck or synchronous rectifier topology. The 256-byte EEPROM saves charge profiles for multiple battery chemistries, and nanoWatt sleep preserves battery when the charger is idle. The 2.0 V minimum supply allows operation down to deeply discharged cells for safe recovery charging.
Recommandé
Educational Trainer Board
Universities and training centers use the PIC18F4221T-I/ML on development boards to teach embedded programming. The 77-instruction RISC core is easy to learn, ICSP debugging allows step-through code execution, and the 44-QFN provides enough I/O for student-led peripheral expansions. The wide supply range (2.0 V to 5.5 V) lets students experiment with both 3.3 V and 5 V peripherals on the same board. The PIC18 heritage means abundant example code and MPLAB X IDE support.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour PIC18F4221T-I/ML — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | PIC18F4221-I/ML | PIC18F4220T-I/ML | PIC18F4321T-I/ML | PIC18F4421T-I/ML | PIC18F4520T-I/ML |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-QFN (8x8 mm) | 44-QFN (8x8 mm) | 44-QFN (8x8 mm) | 44-QFN (8x8 mm) | 44-QFN (8x8 mm) | 44-QFN (8x8 mm) |
| Program Flash | 4 KB | 4 KB | 2 KB | 8 KB | 4 KB | 32 KB |
| Data RAM | 512 B | 512 B | 512 B | 512 B | 768 B | 1536 B |
| Data EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| Max CPU Speed | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) |
| I/O Pins | Up to 36 | Up to 36 | Up to 36 | Up to 36 | Up to 36 | Up to 36 |
| ADC | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 14 channels | 10-bit, 13 channels |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Supply 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 | 2.0 V to 5.5 V |
Principaux différenciateurs
- Compact 44-QFN 8x8 mm with industrial temp range (vs PIC18F4520T-I/ML)
- 4 KB Flash is the sweet-spot density (vs PIC18F4220T-I/ML)
- 10 MIPS is fast enough for most control loops (vs PIC18F4221T-I/PT (TQFP-44))
Notes de conception
Decouple each VDD pin with a 100 nF ceramic capacitor placed within 5 mm of the pin, plus a single 10 uF bulk capacitor at the IC's main supply entry. The 44-QFN has multiple VDD/VSS pairs (pins 11/10, 21/20, 31/30, 41/40) - all must be connected even if some peripheral blocks are unused. Estimated: VDD rise time should stay below 50 ms for proper POR; adding a 10 kohm pull-up on MCLR ensures clean reset behavior.
Route the ICSP pins RB6/PGC and RB7/PGD away from switching nodes and high-current traces to avoid programming glitches. Place the MCLR pull-up (typically 10 kohm to VDD) close to the pin. The QFN44 thermal pad (pin 45, central pad) MUST be soldered to a ground copper pour for mechanical integrity and thermal dissipation. Use at least 4 thermal vias in the central pad for 0.5 W or higher dissipation cases.
Do not configure RA4 as a digital output while the internal comparator is active - RA4 is an open-drain output and requires a pull-up. The 10-bit ADC requires acquisition time (Tacq) of at least 2.45 us at 5 V with a 10 kohm source impedance - configure ADCON2 properly or readings will be inaccurate. When using the internal RC oscillator, the factory calibration constant in Flash location 0x3FFF (or last word of Flash) must be loaded to OSCCAL at startup for accurate frequency.
I2C lines SCL/SCL (RC3/RC4) require pull-up resistors; 4.7 kohm is typical for 100 kHz, 2.2 kohm for 400 kHz. UART TX/RX lines should be series-terminated with 100 ohm if the cable length exceeds 20 cm to suppress ringing. The ICSP clock (PGC) line should not exceed 30 cm to maintain debug signal integrity.
Informations de conformité
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - choose PIC18F2520/4520 automotive variants (I/PT or -E versions) for automotive designs. Lead-free and halogen-free per Microchip environmental certification.
