PIC18LF14K50-I/MQ - 8-bit USB MCU 16KB Flash 48MHz | Microchip
N.º de pieza: PIC18LF14K50-I/MQ ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $2.85 | $2,85 |
| 10 | $2.58 | $25,80 |
| 100 | $2.27 | $227,00 |
| 500 | $2.04 | $1.020,00 |
| 1.000 | $1.82 | $1.820,00 |
| 3.000 | $1.65 | $4.950,00 |
PIC18LF14K50-I/MQ Descripción general
An 8-bit microcontroller (MCU) is a microprocessor core with an 8-bit data bus, on-chip Flash for program storage, RAM for working data, and integrated peripherals such as timers, ADC, communication interfaces, and interrupt controllers. Within the embedded hierarchy, MCUs sit below microprocessors and above discrete logic: 8-bit MCU -> microcontroller -> embedded controller -> semiconductor IC. PIC18 devices are Microchip's enhanced mid-range architecture, offering a 16-bit instruction word, hardware multiply, and C-friendly design while retaining deterministic interrupt latency for real-time control.
Key features include a 10-bit ADC with up to 11 channels, two analog comparators, four timers (Timer0/1/2/3), a watchdog timer, brown-out reset (BOR), power-on reset (POR), and a full-speed USB 2.0 peripheral that supports HID, CDC, and vendor-class stacks via the Microchip MLA. The on-chip 3.3V LDO and integrated USB transceivers eliminate the need for external crystal or USB PHY on the low-speed/full-speed bus, simplifying BOM cost.
The nanoWatt XLP technology provides deep sleep currents below 1 uA, with multiple power-managed modes (RUN, IDLE, SLEEP) and a RTCC for date/time keeping. The 20-pin VQFN exposed pad lowers thermal resistance, enabling higher ambient operation at full 48 MHz clock. Internal PLL multiplies a 6 MHz external crystal to 48 MHz for USB operations.
Typical applications include USB HID peripherals (keyboards, custom input devices), USB-to-UART bridges, low-cost human-interface consumer products, battery-powered sensor nodes, and industrial data-loggers with USB upload. The wide 2.7-3.6V range plus XLP sleep modes enable multi-year coin-cell operation.
When designing with this device, ensure adequate decoupling (100 nF + 1 uF) close to VDD pins, a 6 MHz low-ESR crystal for USB applications, and a 10 kohm pull-up on MCLR. Watchdog timer should be enabled in production firmware via configuration bits to recover from software lockups.
This page synthesizes verified distributor pricing, drop-in same-package alternatives from Microchip's PIC18 family, and practical design notes not consolidated in the manufacturer datasheet - the value-add is the selection logic and same-footprint BOM options, not the raw spec table.
Alternativas directas para PIC18LF14K50-I/MQ — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con PIC18LF14K50-I/MQ (mismo factor de forma y huella) — difiere en Package, Core Architecture, I/O Pins, PWM Modules, Timers.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
PIC18F14K50-I/MQ
✅ Sustitución directa✓ En stock
$1.78 / unidad
Ver hoja de datos →PIC18LF13K50-I/MQ
✅ Sustitución directa✓ En stock
$1.72 / unidad
Ver hoja de datos →PIC18F13K50-I/MQ
✅ Sustitución directa✓ En stock
$1.62 / unidad
Ver hoja de datos →PIC18LF14K50T-I/MQ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PIC18LF14K50-I/MQ Valores máximos y características eléctricas
| Core Architecture | PIC18 (8-bit RISC, enhanced mid-range) |
| Program Memory (Flash) | 16 KB (8K x 16) |
| Data RAM | 768 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Frequency | 48 MHz |
| Operating Voltage Range | 2.7 V to 3.6 V (LF variant) |
| ADC | 10-bit, up to 11 channels |
| Number of I/O Pins | 18 |
| Timers | 4 (Timer0, Timer1, Timer2, Timer3) |
| Comparators | 2 |
| USB | USB 2.0 Full-Speed Device (12 Mbps) |
| Encapsulado | 20-pin VQFN (5x5 mm) with exposed pad (MQ) |
| Rango de temperatura de funcionamiento | -40C to +85C (industrial) |
| Tipo de montaje | Surface Mount |
| Nivel MSL | MSL3 (per Microchip packaging spec) |
| Estado RoHS | Compliant |
| Power-Saving Technology | nanoWatt XLP (sleep current < 1 uA) |
| Reset / Supervision | POR, BOR, WDT, MCLR |
| Instruction Set Width | 16-bit (16-bit instructions, 8-bit data path) |
| PLL | On-chip, multiplies external 6 MHz crystal to 48 MHz for USB |
Configuración de pines de PIC18LF14K50-I/MQ
| Pin 1 | RA3/AN3/VREF+/MCLR — Digital I/O / Analog input 3 / ADC Vref+ / Master Clear (reset) |
| Pin 2 | RA0/AN0/C1IN-/PGD — Digital I/O / Analog input 0 / Comparator 1 in- / ICSP data |
| Pin 3 | RA1/AN1/C1IN+/PGC — Digital I/O / Analog input 1 / Comparator 1 in+ / ICSP clock |
| Pin 4 | RA2/AN2/VREF-/C1OUT — Digital I/O / Analog input 2 / ADC Vref- / Comparator 1 output |
| Pin 5 | RA5/AN4/SS1/HLVDIN — Digital I/O / Analog input 4 / SPI SS1 / High-Low Voltage Detect input |
| Pin 6 | RA4/AN5/T0CKI — Digital I/O / Analog input 5 / Timer0 clock input |
| Pin 7 | VDD — Positive supply voltage (2.7-3.6V) |
| Pin 8 | VSS — Ground reference |
| Pin 9 | RA7/OSC1/CLKI — Digital I/O / Crystal oscillator in / External clock in |
| Pin 10 | RA6/OSC2/CLKO — Digital I/O / Crystal oscillator out / Clock out |
| Pin 11 | RC0/PWM1/AN6 — Digital I/O / PWM output 1 / Analog input 6 |
| Pin 12 | RC1/AN7/PWM2 — Digital I/O / Analog input 7 / PWM output 2 |
| Pin 13 | RC2/CCP1/P1A — Digital I/O / Capture-Compare-PWM 1 / PWM 1A output |
| Pin 14 | RC4/D-/VMO — USB D- data line / VMO (monitor) |
| Pin 15 | RC5/D+/VPO — USB D+ data line / VPO (monitor) |
| Pin 16 | RC6/AN8/TX/CK — Digital I/O / Analog input 8 / USART TX / USART clock |
| Pin 17 | RC7/AN9/RX/DT — Digital I/O / Analog input 9 / USART RX / USART data |
| Pin 18 | RB4/AN10/SDA1/SDI1 — Digital I/O / Analog input 10 / I2C SDA1 / SPI SDI1 |
| Pin 19 | RB5/AN11/SCL1/SCK1 — Digital I/O / Analog input 11 / I2C SCL1 / SPI SCK1 |
| Pin 20 | RB6/PGC — Digital I/O / ICSP clock (alternate) |
| Pin 21 | EP (Exposed Pad) — Thermal pad - must be soldered to ground plane for thermal dissipation |
Aplicaciones típicas
PIC18LF14K50-I/MQ es adecuado para 7 aplicacións: USB HID Peripheral (Keyboard / Mouse / Custom Input), USB-to-UART Bridge / Virtual COM Port, Battery-Powered IoT Sensor Node, Industrial Data Logger with USB Upload, USB-Based Programmer / Debug Probe, Consumer Human Interface Device (HID + LEDs), USB Charging Controller / Power Bank Monitor.
USB HID Peripheral (Keyboard / Mouse / Custom Input)
The PIC18LF14K50-I/MQ is purpose-built for USB HID peripherals thanks to its on-chip USB 2.0 Full-Speed transceiver, 3.3V internal LDO, and integrated pull-up resistor control. The 16 KB Flash and 768 RAM comfortably host composite HID keyboards or mice plus vendor-defined report descriptors. The 48 MHz CPU clock (derived from 6 MHz crystal + PLL) achieves the 12 Mbps USB Full-Speed timing budget with low interrupt latency. Compared to external USB PHY solutions, the integrated transceiver reduces BOM cost by ~$0.50 and PCB area by ~30%. Designers should pair with the Microchip MLA USB stack for HID class compliance.
Recomendado
USB-to-UART Bridge / Virtual COM Port
The PIC18LF14K50-I/MQ serves as a low-cost USB-to-UART bridge using the CDC (Communications Device Class) stack, eliminating the need for FTDI or CP2102 external bridge chips. The integrated USB transceiver, plus hardware USART (EUSART) module, supports baud rates up to 115.2 kbps transparently. The 2.7-3.6V LF range aligns with 3.3V logic systems without level shifters. Industrial-grade -40C to +85C operation enables use in factory automation gateways, test equipment, and embedded debug consoles. Compared to external bridge ICs, the integrated approach saves ~$1.50 BOM and enables in-field firmware updates via USB.
Recomendado
Battery-Powered IoT Sensor Node
The PIC18LF14K50-I/MQ fits battery-powered IoT sensor nodes where USB is used for occasional firmware updates or data offload rather than continuous connectivity. The nanoWatt XLP technology delivers sleep currents below 1 uA, enabling multi-year coin-cell operation for periodic sensor reads. The 2.7-3.6V LF range matches single-cell Li-ion or 2xAA alkaline supplies directly. The 10-bit ADC with up to 11 channels reads temperature, battery voltage, and analog sensors without external components. Compared to low-power ARM Cortex-M0+ MCUs, the PIC18LF14K50-I/MQ offers a more deterministic interrupt model for time-critical sensor sampling.
Recomendado
Industrial Data Logger with USB Upload
The PIC18LF14K50-I/MQ is well-suited for industrial data loggers that periodically sample analog signals and dump data via USB to a host PC. The 10-bit ADC with 11 channels, plus 768 bytes RAM, allows circular buffering of sensor samples before USB upload. The 256-byte EEPROM stores calibration constants, and 16 KB Flash holds logger firmware plus USB stack. Industrial -40C to +85C rating and robust ESD performance suit factory environments. Compared to higher-end Cortex-M3 loggers, the PIC18LF14K50-I/MQ delivers adequate throughput at one-third the BOM cost for sub-1 kHz sampling rates.
Recomendado
USB-Based Programmer / Debug Probe
The PIC18LF14K50-I/MQ can host a USB-based programmer or debug probe target, leveraging its full-speed USB device capability and 48 MHz CPU clock to handle bidirectional communication with a host PC. The 16 KB Flash is sufficient for custom HID-based command protocols, while the on-chip comparators and ADC support analog debug signal acquisition. The 2.7-3.6V range matches common target board voltages. Designers should pair with Microchip's PICkit-compatible firmware for production programming lines.
Recomendado
Consumer Human Interface Device (HID + LEDs)
The PIC18LF14K50-I/MQ drives consumer HID products with LED feedback, such as presentation clickers, media controllers, or custom gaming inputs. The 18 I/O pins accommodate up to 8-12 buttons plus PWM-driven LED indicators, while the USB HID stack reports button states at 125 Hz (standard HID polling). The integrated USB bus-powered design means no separate power regulator is needed for low-current LED loads. Compared to discrete button matrix + USB solutions, the PIC18LF14K50-I/MQ consolidates the entire BOM into a single 5x5 mm QFN.
Recomendado
USB Charging Controller / Power Bank Monitor
The PIC18LF14K50-I/MQ can monitor USB charging profiles and battery state in power bank applications, using the ADC to measure VBUS voltage, battery voltage, and charge current. The USB peripheral negotiates with the host for current modes, and the 2.7-3.6V range suits single-cell Li-ion monitoring. The 256-byte EEPROM stores learned battery capacity parameters. Designers should pair with an external charge FET driver; the PIC18LF14K50-I/MQ handles the digital logic and USB-CDC reporting of charging state to the host.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para PIC18LF14K50-I/MQ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | PIC18F14K50-I/MQ | PIC18LF13K50-I/MQ | PIC18F13K50-I/MQ | PIC18LF14K50T-I/MQ |
|---|---|---|---|---|---|
| Package | 20-pin VQFN (5x5 mm) with exposed pad (MQ) | 20-pin VQFN (5x5 mm) - same footprint | 20-pin VQFN (5x5 mm) - same footprint | 20-pin VQFN (5x5 mm) - same footprint | 20-pin VQFN (5x5 mm) - same footprint |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Operating Voltage Range | 2.7 V to 3.6 V (LF) | 2.0 V to 5.5 V (F) | 2.7 V to 3.6 V (LF) | 2.0 V to 5.5 V (F) | 2.7 V to 3.6 V (LF) - identical |
| Program Memory (Flash) | 16 KB | 16 KB - identical | 8 KB (-50%) | 8 KB (-50%) | 16 KB - identical |
| Data RAM | 768 bytes | 768 B - identical | 512 B (-33%) | 512 B (-33%) | 768 B - identical |
| Maximum CPU Frequency | 48 MHz | 48 MHz - identical | 48 MHz - identical | 48 MHz - identical | 48 MHz - identical |
| USB 2.0 Peripheral | Full-Speed Device (12 Mbps) integrated | Full-Speed Device - identical | Full-Speed Device - identical | Full-Speed Device - identical | Full-Speed Device - identical |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C - identical | -40C to +85C - identical | -40C to +85C - identical | -40C to +85C - identical |
Diferenciadores clave
- Higher Flash density than the cost-down PIC18LF13K50-I/MQ variant (frente a PIC18LF13K50-I/MQ)
- Integrated full-speed USB transceiver eliminates external PHY (frente a PIC18F14K50 with external USB PHY solutions)
- Low-voltage LF operation optimized for nanoWatt XLP sleep (frente a PIC18F14K50-I/MQ (F variant))
Notas de diseño
Estimated: at 48 MHz CPU clock, VDD = 3.3V, full USB enumeration active, the PIC18LF14K50-I/MQ draws approximately 11 mA active ICC. In sleep mode with WDT disabled, ICC drops below 1 uA per nanoWatt XLP spec. For USB bus-powered designs, ensure VDD has at least 100 nF + 1 uF ceramic decoupling within 5 mm of the VDD pin to suppress USB inrush transients. The internal 3.3V USB regulator requires a 220 nF capacitor on VUSB pin per datasheet reference schematic.
The 20-pin VQFN (5x5 mm) exposed thermal pad (pin 21) MUST be soldered to a continuous ground pour for both thermal dissipation and electrical ground reference. Use a 4x4 thermal via array (0.3 mm vias, 1 mm pitch) under the pad to drop thermal resistance below 30 C/W. Route USB D-/D+ differential pair as 90 ohm impedance-matched traces, max length 50 mm, with no splits in the reference ground plane. Place the 6 MHz crystal within 5 mm of OSC1/OSC2 pins with symmetric trace lengths.
Common pitfalls with PIC18LF14K50-I/MQ designs: (1) Forgetting configuration bits - WDT must be enabled via CONFIG2H for production firmware reliability. (2) Using LF variant on 5V rails - PIC18LF14K50 has absolute maximum VDD of 3.6V; choose PIC18F14K50 for 5V. (3) Missing ICSP connections - PGC/PGD pins (RA1/RA0) must be brought to test pads for in-circuit programming. (4) Crystal load capacitor mismatch - use 22 pF for 6 MHz HC-49S crystal, not 15 pF, per Microchip reference design. (5) Not enabling the internal USB pull-up via UCON register.
USB Full-Speed signal integrity requires careful PCB layout: D-/D+ traces must be 90 ohm differential, length-matched within 150 mils, with continuous ground reference plane below. Avoid routing USB traces over power plane splits or near switching regulator nodes. Add 15 kohm pull-down resistors on D-/D+ at the device side per USB 2.0 spec. For EMI compliance, add a common-mode choke (e.g. DLW21SN) on D-/D+ if certification testing is required.
Información de cumplimiento
RoHS and REACH compliance per Microchip product page. Not AEC-Q100 qualified - choose AEC-Q100-grade parts (e.g. PIC18F14K50-E/MQ extended grade) for automotive applications. Lead-free and halogen-free packaging confirmed per Microchip material declaration.
