PIC18LF4321-I/P - 8-Bit MCU, 8KB Flash, 40MHz | Microchip
Teilenummer: PIC18LF4321-I/P ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $7.2 | $7,20 |
| 10 | $6.48 | $64,80 |
| 100 | $5.95 | $595,00 |
| 500 | $5.42 | $2.710,00 |
| 1.000 | $4.98 | $4.980,00 |
PIC18LF4321-I/P Übersicht
A microcontroller (MCU) is a single-chip computer that integrates a CPU, program and data memory, and programmable I/O peripherals onto one die, enabling standalone embedded control. PIC18F devices sit in Microchip's 8-bit enhanced architecture family, between the baseline PIC16F and the 16-bit dsPIC/PIC24 families, optimized for low-power, deterministic, interrupt-driven applications such as motor control, industrial sensing, and consumer appliances. The enhanced 16-bit instruction set and 31-level hardware stack balance C-compiler friendliness with predictable real-time response.
Key features include 10-bit ADC with up to 13 input channels, two analog comparators, an Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART), two MSSP (I²C/SPI) modules, two Capture/Compare/PWM (CCP) modules plus an Enhanced CCP for motor-control PWMs, two 8-bit timers and three 16-bit timers, and a 10-bit ADC. The LF core supports software-selectable oscillator modes including INTOSC (up to 8 MHz), HS, XT, LP, EC, and PLL with x4, providing flexible clocking for low-EMI and battery-powered designs.
Typical applications include industrial control panels, white goods and major-appliance user interfaces, low-cost remote sensor nodes, HVAC thermostat control, automotive body and lighting peripherals (non-safety), USB-to-UART bridges when paired with a PIC18LF2550, and battery-powered handheld instrumentation where the 2.0 V min supply extends usable runtime from partially-depleted cells. The 40-PDIP footprint enables breadboard-friendly prototyping and reworkable through-hole assembly.
When designing with the PIC18LF4321-I/P, ensure that VDDCORE decoupling (0.1 µF + 10 µF bulk) is placed within 6 mm of the dedicated VDDCORE/VSS pairs and respect the 50-pin microcontroller ESD precautions. Designers migrating from PIC16F should budget for the larger Flash-to-RAM ratio and 16-bit instruction word when estimating code density.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in-Alternativen für PIC18LF4321-I/P – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit PIC18LF4321-I/P (gleiche Bauform und Footprint) – abweichend in ADC, Timers, Core Architecture, Package, Mounting Type.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
PIC18F4321-I/P
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
PIC18LF4320-I/P
✅ Drop-In ⚠️ Spezifikationen ungeprüft✓ Auf Lager
$4.76 / Stück
Datenblatt ansehen →PIC18LF4221-I/PT
✅ Drop-In ⚠️ Spezifikationen ungeprüft✓ Auf Lager
$3.16 / Stück
Datenblatt ansehen →PIC18LF4331-I/P
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
PIC18LF4321-I/ML
✅ Drop-In✓ Auf Lager
$4.43 / Stück
Datenblatt ansehen →PIC18LF4321-I/P Grenzwerte & elektrische Eigenschaften
| Core Architecture | PIC18F (8-bit enhanced) |
| CPU Core | RISC 8-bit |
| Max CPU Speed | 40 MHz (10 MIPS) |
| Instruction Set | 77 instructions, 16-bit opcodes |
| Program Memory | 8 KB (4K × 16 words) Flash |
| SRAM | 512 bytes |
| EEPROM | 256 bytes |
| Operating Voltage Range | 2.0 V to 5.5 V (LF variant) |
| Betriebstemperaturbereich | -40 °C to +85 °C (Industrial) |
| Package / Pin Count | 40-PDIP (DIP-40, through-hole) |
| Montageart | Through-Hole |
| ADC | 10-bit, multi-channel |
| Timers | 2 × 8-bit + 3 × 16-bit |
| Communication Modules | EUSART, 2 × MSSP (I²C/SPI) |
| PWM Modules | 2 × CCP + 1 × ECCP |
| Analog Comparators | 2 |
| MSL-Level | Not applicable (through-hole) |
PIC18LF4321-I/P Pin-Konfiguration
| Pin 1 | RA0/AN0 — I/O port A bit 0 / analog input 0 |
| Pin 2 | RA1/AN1 — I/O port A bit 1 / analog input 1 |
| Pin 3 | RA2/AN2/VREF- — I/O port A bit 2 / analog input 2 / VREF- |
| Pin 4 | RA3/AN3/VREF+ — I/O port A bit 3 / analog input 3 / VREF+ |
| Pin 5 | RA4/T0CKI — I/O port A bit 4 / Timer0 clock input |
| Pin 6 | RA5/AN4 — I/O port A bit 5 / analog input 4 |
| Pin 7 | RE0/RD/AN5 — I/O port E bit 0 / read control / analog input 5 |
| Pin 8 | RE1/WR/AN6 — I/O port E bit 1 / write control / analog input 6 |
| Pin 9 | RE2/CS/AN7 — I/O port E bit 2 / chip select / analog input 7 |
| Pin 10 | VDD — Main power supply |
| Pin 11 | VSS — Ground reference |
| Pin 12 | OSC1/CLKI/RA7 — Crystal oscillator input / external clock in |
| Pin 13 | OSC2/CLKO/RA6 — Crystal oscillator output / clock out |
| Pin 14 | RC0/T1OSO/T13CKI — I/O port C bit 0 / Timer1 oscillator output / Timer1 clock |
| Pin 15 | RC1/T1OSI/CCP2 — I/O port C bit 1 / Timer1 oscillator input / CCP2 output |
| Pin 16 | RC2/CCP1 — I/O port C bit 2 / CCP1 output |
| Pin 17 | RC3/SCK/SCL — I/O port C bit 3 / SPI clock / I²C clock |
| Pin 18 | RC4/SDI/SDA — I/O port C bit 4 / SPI data in / I²C data |
| Pin 19 | RC5/SDO — I/O port C bit 5 / SPI data out |
| Pin 20 | RC6/TX/CK — I/O port C bit 6 / EUSART TX / EUSART clock |
| Pin 21 | RC7/RX/DT — I/O port C bit 7 / EUSART RX / EUSART data |
| Pin 22 | RB0/INT0 — I/O port B bit 0 / external interrupt 0 |
| Pin 23 | RB1/INT1 — I/O port B bit 1 / external interrupt 1 |
| Pin 24 | RB2/INT2 — I/O port B bit 2 / external interrupt 2 |
| Pin 25 | RB3/CCP2 — I/O port B bit 3 / CCP2 |
| Pin 26 | RB4 — I/O port B bit 4 |
| Pin 27 | RB5 — I/O port B bit 5 |
| Pin 28 | RB6/PGC — I/O port B bit 6 / ICSP clock |
| Pin 29 | RB7/PGD — I/O port B bit 7 / ICSP data |
| Pin 30 | VDD — Main power supply |
| Pin 31 | VSS — Ground reference |
| Pin 32 | RD0 — I/O port D bit 0 |
| Pin 33 | RD1 — I/O port D bit 1 |
| Pin 34 | RD2 — I/O port D bit 2 |
| Pin 35 | RD3 — I/O port D bit 3 |
| Pin 36 | RD4 — I/O port D bit 4 |
| Pin 37 | RD5 — I/O port D bit 5 |
| Pin 38 | RD6 — I/O port D bit 6 |
| Pin 39 | RD7 — I/O port D bit 7 |
| Pin 40 | AVDD — Analog power supply |
Typische Anwendungen
PIC18LF4321-I/P ist geeignet für 6 Anwendungs: Industrial Control Panels, White Goods / Major Appliances, HVAC Thermostat Control, Battery-Powered Sensor Node, USB-to-UART Bridge Module, Automotive Body/Lighting Controller (Non-Safety).
Industrial Control Panels
The PIC18LF4321-I/P fits industrial control panels because its 2.0 V to 5.5 V supply range tolerates wide 24 V-bus-derived rails after regulation, while the 10-bit ADC with dedicated analog reference reads 4-20 mA current loop signals from field transmitters with 1 mV resolution. Two CCP modules plus ECCP drive relay coils and contactor coils directly via optocoupled transistor interfaces, and the EUSART links to RS-485 transceivers for Modbus RTU communication. The 40-PDIP package supports through-hole PCB assembly that withstands vibration in factory-floor enclosures better than surface-mount parts, and the 77-instruction RISC core plus 8 KB Flash accommodates complete PID loop and Modbus stack implementations without external memory.
Empfohlen
White Goods / Major Appliances
Consumer washing machines, dishwashers, and refrigerators fit the PIC18LF4321-I/P because the 8 KB Flash stores motor-control PID tables and user-interface state machines, while the ECCP generates 4-channel PWM with programmable dead-band for driving washing-machine drum or compressor BLDC motors. The 2.0 V to 5.5 V supply range and 31 kHz low-power oscillator let the MCU monitor door switches and pushbutton presses at average current below 30 µA in standby mode, extending ENERGY STAR compliance. The integrated 10-bit ADC reads thermistor divider and water-level sensors simultaneously with sample-and-hold scanning at the 40 MHz core rate, achieving a one-second ADC throughput that satisfies appliance controller response requirements.
Empfohlen
HVAC Thermostat Control
Wall-mounted HVAC thermostats fit the PIC18LF4321-I/P because the LF variant's 2.0 V minimum supply matches common 24 VAC transformer-derived regulated rails with extra headroom, while the 40-MIPS performance runs the PI loop at 1 Hz without CPU saturation. The integrated 10-bit ADC multiplexes four 10 kΩ NTC thermistor dividers for indoor, outdoor, supply-air, and humidity probe, while the EUSART links the controller to Wi-Fi or sub-GHz wireless module over UART for smartphone integration. The 40-PDIP through-hole format allows large-pad solder-friendly rework during field service, while the -40 °C to +85 °C industrial grade supports unheated attic enclosure environments.
Empfohlen
Battery-Powered Sensor Node
Wireless IoT sensor nodes operating from a single-cell Li-ion or alkaline pair fit the PIC18LF4321-I/P because the LF supply range extends usable runtime down to 2.0 V when the cell is partially depleted, and the 31 kHz INTOSC consumes only microamp current in Sleep mode while still waking the MCU on UART activity or ADC-comparator interrupt. The 8 KB Flash stores MB-connected Zigbee or LoRa register configurations and 8-bit trimmed ADC coefficients, while the 256-byte EEPROM retains calibration constants across battery replacement. The EUSART plus MSSP drives a LoRa transceiver and a SPI flash simultaneously with deterministic interrupt latency, and the 40-PDIP footprint simplifies robotic assembly on legacy through-hole sensor boards.
Empfohlen
USB-to-UART Bridge Module
USB-to-UART bridge modules using a PIC18LF2550 companion with the PIC18LF4321-I/P for monitoring fit the part family because the LF supply matches 3.3 V USB regulated rails and the 40-pin DIP exposes the full set of peripheral functions for serial protocol debugging. When used as a debug sink, the PIC18LF4321-I/P receives bytes from the PIC18LF2550's UART, decodes them with the EUSART DMA-style interrupt service, and reflects status on its 5 timers, while the SPI MSSP drives an SSD1306 OLED display at 4 MHz without CPU overhead. The 8 KB Flash holds small command parsers and 16-bit cyclic-redundancy-check validators for industrial UART protocols like BACnet or Modbus ASCII.
Empfohlen
Automotive Body/Lighting Controller (Non-Safety)
Non-safety automotive body modules such as interior lighting, mirror adjustment, and seat-position memory fit the PIC18LF4321-I/P because the industrial -40 °C to +85 °C range withstands cabin temperatures, while the LF supply operates directly from a 5 V regulated body-control rail. The ECCP provides PWM dimming for LED interior and instrument-cluster illumination, and the 10-bit ADC multiplexes photodiode sense inputs for auto-headlamp and twilight detection. The EUSART connects the module to a CAN-MCP2551 CAN bridge chip via SPI-over-MSSP at 1 Mb/s, while the 40-PDIP package is preferred for low-volume body-module prototypes sold in garages rather than OEM production lines.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für PIC18LF4321-I/P – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | PIC18F4321-I/P | PIC18LF4320-I/P | PIC18LF4331-I/P | PIC18LF4221-I/P | PIC18LF4321-I/ML |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-PDIP (through-hole) | 40-PDIP (through-hole) | 40-PDIP (through-hole) | 40-PDIP (through-hole) | 40-PDIP (through-hole) | 44-QFN (SMD) |
| Operating Voltage Range | 2.0 V to 5.5 V | 4.2 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 |
| Max CPU Frequency | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) |
| ADC Resolution | 10-bit | 10-bit | 10-bit | 12-bit | 10-bit | 10-bit |
| ECCP Module | Yes (1× ECCP + 2× CCP) | Yes (1× ECCP + 2× CCP) | Yes (1× ECCP + 2× CCP) | Yes (motor-control optimized) | Yes (1× ECCP + 2× CCP) | Yes (1× ECCP + 2× CCP) |
Wichtigste Unterscheidungsmerkmale
- Low-voltage 2.0 V minimum supply (vs. PIC18F4321-I/P)
- Enhanced CCP module for motor control (vs. PIC18F4331-I/P)
- Through-hole 40-PDIP form factor (vs. PIC18LF4321-I/ML)
Designhinweise
Place a 0.1 µF ceramic decoupling capacitor within 6 mm of every VDD/VSS pair, plus a 10 µF bulk tantalum or aluminum-polymer capacitor on the main VDD rail. The PIC18LF4321-I/P can operate from 2.0 V to 5.5 V, so for 5 V systems use a common MCP1700 or 7805 LDO. For battery-powered 2-3 cell packs, the LF variant extends usable runtime by 30-40% versus the standard PIC18F4321, which requires 4.2 V minimum to start up.
When migrating from PIC16F to PIC18LF4321-I/P, do not assume Flash page size is identical: PIC18 uses 64-word (128-byte) Flash erase pages versus 2 KB on PIC16F1xx. Also, the configuration bits register is at address 0x300000, not at the end of Flash as on PIC16F. Always run the FRM 'Migration to PIC18F' guidelines when porting C code; firmware compiled for PIC16F873 will not directly run on PIC18F4321. The Analog Comparator CVREF reference voltage at FVR is ~1.2 V, not 2.5 V as on PIC18F older silicon revisions.
The 40-PDIP package leaves 0.1 inch pin pitch which is breadboard-friendly but requires through-hole PCB mounting. Route analog signals RA0-RA5 away from digital switching traces like RC0-RC7 (EUSART / MSSP) to minimize ADC-induced noise; add a guard ring around AVdd and place the FVR bypass cap adjacent to pin 11 (VSS). For high-impedance sensors, enable the ADC's acquisition time extension in ADCON1 to 4 Tad or higher to avoid sampling-capacitor charge sharing errors.
Compliance-Informationen
RoHS compliance confirmed by Microchip product page; industrial temperature rating (I-suffix) supports -40 °C to +85 °C; not AEC-Q100 qualified - for automotive safety-critical use, select PIC18F4321-I/PT automotive-grade variant instead.
