PIC18LF4423T-I/ML - 8-bit 40MHz 16KB Flash MCU | Microchip
MPN: PIC18LF4423T-I/ML ✓ פעילPIC18LF4423T-I/ML סקירה
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals. The PIC18 family is Microchip's enhanced 8-bit architecture, sitting between the baseline PIC10/12/16 families and the 16-bit PIC24/dsPIC line in Microchip's taxonomy (8-bit MCU -> PIC18 -> enhanced FLASH microcontroller -> semiconductor). The LF sub-family specifically targets battery-powered and energy-conscious designs with extended low-voltage operation.
Key features include 16 KB (8K x 16) Flash, 768 bytes SRAM, 256 bytes EEPROM, 10-bit A/D converter with up to 13 input channels, 2 capture/compare/PWM modules, a USART, MSSP (SPI/I2C), 2 analog comparators, and nanoWatt technology that drops supply current below 1 microampere in sleep mode. The 44-pin QFN package has an exposed thermal pad for improved heat dissipation.
The PIC18LF4423 architecture uses a Harvard design with separate program and data buses, an 8-bit ALU with hardware multiply support, and a 16-bit instruction word. The wide supply range (2.0 V to 5.5 V for the LF core, with the part characterized at 2.5 V / 3.3 V / 5 V) makes it suitable for both 3.3 V and 5 V systems. The nanoWatt power-management features include multiple idle modes, peripheral disable controls, and a real-time clock calibration circuit.
Typical applications include industrial control panels, low-power sensor nodes, home appliances, automotive body electronics, HVAC controls, and USB/HID human-interface devices. The wide operating voltage makes the part especially attractive for battery-backed or unregulated-supply designs where the source voltage varies with load.
When designing with this part, ensure the QFN exposed pad is soldered to the ground plane to meet thermal specifications. The device operates from -40 C to +85 C in the Industrial temperature range and supports in-circuit serial programming (ICSP) via two pins, enabling firmware updates in the field without removing the MCU.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes drawn from the manufacturer datasheet and authorized distributor listings - information not aggregated in any single manufacturer or distributor source.
חלופות תחליף ישיר עבור PIC18LF4423T-I/ML — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם PIC18LF4423T-I/ML (אותו גורם צורה וטביעת רגל) — שונים ב Package, Program Memory (Flash), ADC, Operating Temperature, Timers.
PIC18LF4423-I/ML
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PIC18LF4420T-I/ML
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18LF4410T-I/ML
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18LF4523T-I/ML
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18LF2523T-I/ML
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18LF4423T-I/ML דירוגים מרביים ומאפיינים חשמליים
| Core Architecture | 8-bit PIC18 enhanced RISC |
| Program Memory (Flash) | 16 KB (8K x 16) |
| Data SRAM | 768 bytes |
| Data EEPROM | 256 bytes |
| Maximum Clock Speed | 40 MHz |
| Supply Voltage Range | 2.5 V / 3.3 V / 5 V (2.0 V - 5.5 V LF core) |
| I/O Pins | 34 |
| ADC | 10-bit, up to 13 channels |
| PWM Modules (CCP) | 2 |
| Communication Peripherals | 1x USART, 1x MSSP (SPI/I2C) |
| Analog Comparators | 2 |
| Timers | 1x 8-bit, 3x 16-bit |
| טמפרטורת פעולה | -40 C to +85 C (Industrial) |
| מארז | 44-pin QFN with exposed pad (8x8 mm) |
| סוג הרכבה | Surface Mount |
| Power-Saving Features | nanoWatt technology, multiple idle/sleep modes |
| Programming | ICSP (In-Circuit Serial Programming) |
| סטטוס RoHS | Compliant |
תצורת פינים של PIC18LF4423T-I/ML
| פין 1 | MCLR/VPP/RE3 — Master Clear (reset) input / programming voltage / PORTE bit 3 |
| פין 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| פין 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| פין 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC VREF- |
| פין 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC VREF+ |
| פין 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| פין 7 | RA5/AN4 — PORTA bit 5 / analog input 4 |
| פין 8 | OSC1/CLKI — Oscillator crystal input / external clock input |
| פין 9 | OSC2/CLKO — Oscillator crystal output / clock output |
| פין 10 | RC0/T1OSO — PORTC bit 0 / Timer1 oscillator output |
| פין 11 | RC1/T1OSI — PORTC bit 1 / Timer1 oscillator input |
| פין 12 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| פין 13 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| פין 14 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| פין 15 | RC5/SDO — PORTC bit 5 / SPI data out |
| פין 16 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| פין 17 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| פין 18 | VSS — Ground reference |
| פין 19 | VDD — Positive supply voltage |
| פין 20 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| פין 21 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| פין 22 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| פין 23 | RB3/CCP2 — PORTB bit 3 / CCP2 PWM output |
| פין 24 | RB4 — PORTB bit 4 |
| פין 25 | RB5 — PORTB bit 5 |
| פין 26 | RB6/PGC — PORTB bit 6 / ICSP clock |
| פין 27 | RB7/PGD — PORTB bit 7 / ICSP data |
| פין 28 | VSS — Ground reference |
| פין 29 | VDD — Positive supply voltage |
| פין 30 | RD0 — PORTD bit 0 |
| פין 31 | RD1 — PORTD bit 1 |
| פין 32 | RD2 — PORTD bit 2 |
| פין 33 | RD3 — PORTD bit 3 |
| פין 34 | RD4 — PORTD bit 4 |
| פין 35 | RD5 — PORTD bit 5 |
| פין 36 | RD6 — PORTD bit 6 |
| פין 37 | RD7 — PORTD bit 7 |
| פין 38 | VSS — Ground reference |
| פין 39 | VDD — Positive supply voltage |
| פין 40 | RE0/RD — PORTE bit 0 / parallel slave port read |
| פין 41 | RE1/WR — PORTE bit 1 / parallel slave port write |
| פין 42 | RE2/CS — PORTE bit 2 / parallel slave port chip select |
| פין 43 | AVSS — Analog ground reference |
| פין 44 | AVDD — Analog positive supply voltage |
יישומים טיפוסיים
PIC18LF4423T-I/ML מתאים עבור 6 יישוםs: Industrial Control Panels, Battery-Powered Sensor Nodes, Home Appliance Control, Automotive Body Electronics, USB Human Interface Devices, HVAC and Building Automation.
Industrial Control Panels
The PIC18LF4423T-I/ML's wide 2.0 V to 5.5 V supply range and 40 MHz / 10 MIPS core make it ideal for industrial control panels where the supply may come from an unregulated 24 V bus dropped to 5 V or 3.3 V via a simple LDO. Its 34 I/O pins drive keypads, LED indicators, character LCDs, and relay banks, while the 10-bit ADC reads analog sensor inputs such as temperature, pressure, and 4-20 mA loop signals. Compared to a baseline PIC16, the enhanced PIC18 core provides hardware multiply and a 16-bit instruction word that simplifies the C-generated state machines used for menu navigation and fault handling. nanoWatt power-saving features reduce standby current below 1 microampere, allowing battery-backed panels to ride out power interruptions gracefully.
מומלץ
Battery-Powered Sensor Nodes
The 'LF' wide-voltage core and nanoWatt power-management technology make the PIC18LF4423T-I/ML a strong fit for battery-powered sensor nodes running from 2x AA cells (3 V nominal) or single-cell Li-Ion packs. In sleep mode the part draws less than 1 microampere, allowing years of operation on a small primary cell when the wake interval is several seconds. The integrated 10-bit ADC samples temperature, humidity, or gas-sensor outputs directly, while the USART links to a low-power radio module such as the MRF89XA or RN2483 LoRa transceiver. Compared to a 32-bit Cortex-M0 alternative, the PIC18F4423 delivers adequate MIPS at lower active current and at lower cost, which is decisive for high-volume wireless sensor deployments.
מומלץ
Home Appliance Control
The PIC18LF4423T-I/ML is well matched to home appliance control boards - washing machines, dishwashers, microwave ovens, and HVAC thermostats - where it must drive triac-controlled AC loads, read thermistor inputs, and manage user keypads and 7-segment or character LCD displays. Its 34 I/O pins handle multiple relays and capacitive-touch inputs through the CTMU peripheral, while the 10-bit ADC captures thermistor and mains-voltage zero-cross signals for phase-angle dimming. The 40 MHz instruction rate supports software UART baud-rate generation for legacy appliance buses. Compared to a smaller-pin PIC16, the 4423 provides enough memory and peripherals to host a state-machine UI plus a safety watchdog on a single chip.
מומלץ
Automotive Body Electronics
The PIC18LF4423T-I/ML's industrial -40 C to +85 C temperature range and wide 2.0 V to 5.5 V supply tolerance suit non-safety automotive body electronics such as interior lighting controllers, seat-position memory modules, mirror adjusters, and HVAC blend-door actuators. The PIC18 enhanced core handles LIN-based communication stacks via the integrated USART plus an external LIN transceiver, while the 10-bit ADC reads potentiometer feedback for motor-position sensing. Note that this part is not AEC-Q100 qualified; for safety-critical or under-hood designs, choose a Q1/AEC-Q100 part such as the PIC18F46K22-I/ML instead. The 4423's 16 KB Flash provides headroom for LIN diagnostic services and OBD-II support.
מומלץ
USB Human Interface Devices
The PIC18LF4423T-I/ML, paired with Microchip's free USB stack, implements low-speed USB 1.1 human-interface devices such as keyboards, mice, game pads, and custom HID controllers. The 40 MHz core and 16 KB Flash accommodate the USB interrupt service routine plus HID report parsing, while the 10-bit ADC handles analog joystick axes. Although this part lacks an integrated USB SIE (the PIC18F2550/4550 family has it on-chip), external USB connectivity via the MCP2200 bridge is straightforward and keeps the 4423 design low-risk. The 34 I/O pins drive mechanical switches, LEDs, and PWM-controlled haptic feedback motors.
מומלץ
HVAC and Building Automation
The PIC18LF4423T-I/ML is well suited to HVAC zone controllers, smart thermostats, and building-automation nodes that interface with BACnet or Modbus field buses. The 16 KB Flash hosts a Modbus RTU slave stack plus scheduling logic, while the 10-bit ADC reads thermistor temperature sensors and humidity probes. The wide supply range tolerates long 24 VAC wiring runs after rectification. The 40 MHz core handles PID loops for damper and valve control at adequate update rates. Compared to a basic 8-pin PIC, the 4423's 34 I/O pins drive character LCDs, keypads, and multi-stage relays without external I/O expanders, reducing BOM cost in volume deployments.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור PIC18LF4423T-I/ML — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | PIC18LF4423-I/ML | PIC18LF4420T-I/ML | PIC18LF4410T-I/ML | PIC18LF4523T-I/ML | PIC18LF2523T-I/ML |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin QFN (8x8 mm) | 44-pin QFN (8x8 mm) - same | 44-pin QFN (8x8 mm) - same | 44-pin QFN (8x8 mm) - same | 44-pin QFN (8x8 mm) - same | 44-pin QFN (8x8 mm) - same |
| Integrated ADC | 10-bit, 13 channels | 10-bit, 13 channels | None (no ADC) | 10-bit (channels vary) | 10-bit, 13 channels | 10-bit, reduced channels |
| Supply Voltage Range | 2.0 V - 5.5 V | 2.0 V - 5.5 V | 2.0 V - 5.5 V | 2.0 V - 5.5 V | 2.0 V - 5.5 V | 2.0 V - 5.5 V |
מבדילים עיקריים
- Wide 2.0 V to 5.5 V LF core voltage range (לעומתPIC18F4423 (non-LF variant))
- Integrated 10-bit ADC with 13 input channels (לעומתPIC18LF4420T-I/ML)
- nanoWatt power-saving technology (לעומתPIC18LF4515T-I/ML)
הערות תכנון
The 44-pin QFN package has an exposed thermal pad on the underside that MUST be soldered to a ground plane for mechanical reliability and thermal dissipation. Per the Microchip datasheet, missing the exposed-pad solder connection reduces the part's ability to dissipate the ~100 mA peak current and can trigger thermal shutdown under load. Use at least five thermal vias in the exposed-pad land pattern to conduct heat into inner PCB copper layers.
Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of each VDD pin (the 44-pin QFN has multiple VDD pins at pins 19, 29, 39 and AVDD at pin 44). Add a bulk 10 uF tantalum or ceramic capacitor on the main supply rail. Estimated: total inrush during ICSP programming can reach 30 mA; the bulk capacitor must recharge between ISP cycles without collapsing the rail below 2.0 V.
Do not confuse the LF (wide-voltage 2.0-5.5 V) PIC18LF4423 with the PIC18F4423 (4.2-5.5 V only). Operating the F variant below 4.2 V causes Flash programming failure and erratic ADC readings. Also note that the 44-pin QFN is not hand-solderable; plan for reflow or hot-air rework from the start of the design. The MCLR pin (pin 1) requires a 10 kohm pull-up to VDD for normal operation.
Keep traces to the OSC1/OSC2 crystal pins (pins 8 and 9) short (under 5 mm) and guard them with a ground pour to minimize stray capacitance. For 40 MHz operation use a fundamental-mode crystal with load capacitance matching the datasheet specification (typically 15-20 pF). If you route the ICSP signals PGC (pin 26) and PGD (pin 27) away from high-frequency switching nodes, in-circuit programming will be reliable even on production boards with populated peripherals.
מידע על תאימות
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - this is the I (Industrial) grade only. For AEC-Q100 automotive designs, choose a Q1 part from the PIC18F family.
