PIC18F14K50-I/SS - 8-bit USB MCU, 16KB Flash, 48MHz | Microchip
MPN: PIC18F14K50-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.45 | $3.45 |
| 10 | $3.1 | $31.00 |
| 100 | $2.74 | $274.00 |
| 500 | $2.4 | $1,200.00 |
| 1,000 | $2.15 | $2,150.00 |
PIC18F14K50-I/SS Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash/ROM), data memory (RAM), and peripherals such as timers, ADC, communication interfaces, and I/O pins. MCUs sit at the heart of nearly every embedded system, from USB peripherals to IoT sensor nodes, and belong to the broader hierarchy of microprocessors, embedded controllers, and integrated circuits (semiconductors). The PIC18 family is Microchip's 8-bit mainstream line, designed for deterministic interrupt-driven firmware development in C or assembly.
Key features of the PIC18F14K50-I/SS include 16 I/O pins, 15 channels of 10-bit ADC, a USB 2.0 full-speed transceiver with on-chip 3.3V regulator, two comparators, one enhanced capture/compare/PWM (ECCP) module, two standard CCP modules, EUSART, and an MSSP (SPI/I2C). The XLP technology provides nanoWatt sleep currents as low as 20 nA in sleep mode, making it suitable for battery-powered USB devices.
Architecturally, the PIC18F14K50 uses a 16-bit instruction word with an 8-bit data path, 31-level hardware stack, and deterministic interrupt latency. The internal USB transceiver automatically switches between a 48MHz USB clock and the system clock when VBUS is detected, enabling firmware to remain in low-power state until a host is connected. This is a meaningful design simplification compared to external USB interface ICs (like FTDI or MCP2200) that require additional components and PCB area.
Typical applications include low-cost USB HID peripherals (keyboards, mice, custom input devices), USB-to-UART bridges, USB sensors, low-cost data loggers, USB charging controllers, and battery-powered USB dongles. The 20-pin SSOP footprint offers a compact solution for USB device designs where PCB space is constrained.
When designing with the PIC18F14K50-I/SS, place a 200-ohm ferrite bead and decoupling capacitors in series with VUSB, and ensure the 3.3V USB regulator output is bypassed with at least 0.1uF and 10uF ceramic capacitors as specified in the Microchip datasheet. Forgetting these components is a common cause of USB enumeration failures in first-time designs.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the standalone manufacturer datasheet, helping engineers compare candidates and source reliably.
Drop-in alternatives for PIC18F14K50-I/SS — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC18F14K50-I/SS (same form factor and footprint) — differing in Package, ADC, Operating Temperature, Core Architecture, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F13K50-I/SS
✅ Drop-In✓ In Stock
$1.65 / Unit
View Datasheet →PIC18F14K50-I/MQ
✅ Drop-In✓ In Stock
$1.78 / Unit
View Datasheet →PIC18F14K50-I/SO
✅ Drop-In✓ In Stock
$1.45 / Unit
View Datasheet →PIC18LF14K50T-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F14K22-I/SS
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →PIC18F14K50-I/SS Maximum Ratings & Electrical Characteristics
| Core | PIC18 8-bit |
| Family | PIC XLP 18K |
| Program Memory (Flash) | 16 KB (8K x 16) |
| RAM | 768 bytes |
| Maximum CPU Clock | 48 MHz |
| Supply Voltage | 4.2 V to 5.5 V |
| I/O Pins | 16 |
| ADC | 10-bit, up to 15 channels |
| USB Interface | USB 2.0 Full-Speed (12 Mbps), on-chip transceiver |
| Comparators | 2 |
| CCP/ECCP Modules | 1 ECCP + 2 CCP |
| Communication Peripherals | EUSART, MSSP (SPI/I2C) |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 20-SSOP (5.30 mm body width) |
| Mounting Type | Surface Mount |
| Low-Power Technology | nanoWatt XLP |
| Sleep Current | approx. 20 nA (XLP typical) |
| RoHS Status | Compliant |
PIC18F14K50-I/SS Pin Configuration
| Pin 1 | RA5/D+/VBUS — I/O / USB D+ / VBUS sense |
| Pin 2 | RA4/D- — I/O / USB D- |
| Pin 3 | RA3/MCLR/VPP — I/O / Master Clear (Reset) / Programming voltage |
| Pin 4 | RA2/T0CKI/AN2 — I/O / Timer0 clock / Analog input 2 |
| Pin 5 | RA1/AN1 — I/O / Analog input 1 |
| Pin 6 | RA0/AN0 — I/O / Analog input 0 |
| Pin 7 | VSS — Ground |
| Pin 8 | VDD — Positive supply (4.2 V to 5.5 V) |
| Pin 9 | RB7/PGD/TX/CK — I/O / ICSP data / EUSART TX |
| Pin 10 | RB6/PGC/RX/DT — I/O / ICSP clock / EUSART RX |
| Pin 11 | RB5/AN11 — I/O / Analog input 11 |
| Pin 12 | RB4/AN10/SDI/SDA — I/O / Analog / SPI SDI / I2C SDA |
| Pin 13 | RB3/CCP2/AN9 — I/O / CCP2 / Analog input 9 |
| Pin 14 | RB2/CCP1/AN8 — I/O / CCP1 / Analog input 8 |
| Pin 15 | RB1/AN7/SDO — I/O / Analog / SPI SDO |
| Pin 16 | RB0/AN4/FLT0/INT0/SS — I/O / Analog / Fault / External int / SPI SS |
| Pin 17 | RC7/AN6 — I/O / Analog input 6 |
| Pin 18 | RC6/AN5 — I/O / Analog input 5 |
| Pin 19 | RC3/AN12 — I/O / Analog input 12 |
| Pin 20 | VUSB — USB 3.3V regulator output (bypass required) |
Typical Applications
PIC18F14K50-I/SS is suitable for 6 applications: USB HID Peripheral Devices, USB-to-UART Bridge Adapter, USB Sensor Dongle / Data Logger, USB Charging Controller / Power Bank Interface, Custom USB Vendor-Class Device, Low-Cost USB Audio Class Device.
USB HID Peripheral Devices
The PIC18F14K50-I/SS is ideal for low-cost USB HID peripherals such as custom keyboards, mice, game controllers, and barcode scanners. Its on-chip USB 2.0 full-speed transceiver eliminates the need for external PHY ICs, while 16 KB of Flash comfortably fits the Microchip USB HID stack with feature reports. At 48 MHz the MCU services 1 ms USB polls without CPU saturation. Compared to external USB bridge solutions like the MCP2200, the 14K50 reduces BOM count by 4-5 components and PCB area by roughly 30 percent.
Recommended
USB-to-UART Bridge Adapter
For USB-to-UART bridge designs, the PIC18F14K50-I/SS provides a single-chip solution integrating the USB transceiver, EUSART, and voltage regulation. Designers can implement a CDC class device that emulates a COM port using the Microchip USB CDC stack, eliminating the FTDI FT232R and reducing system cost to under USD 3. The 768-byte RAM and 48 MHz performance handle full UART throughput up to 921600 baud with DMA-assisted ring buffers. This is widely used in industrial debug ports, IoT gateways, and firmware update channels.
Recommended
USB Sensor Dongle / Data Logger
The PIC18F14K50-I/SS is well-suited for USB sensor dongles and small data loggers because the nanoWatt XLP technology holds sleep current at roughly 20 nA, preserving battery life between measurements. The 10-bit ADC with 15 input channels captures temperature, voltage, and analog sensor data, while USB VBUS detection automatically wakes the device only when plugged in. This avoids the typical drawback of always-on sensor sticks that drain coin cells in weeks. Typical products include USB temperature loggers and portable environmental monitors.
Recommended
USB Charging Controller / Power Bank Interface
USB charging controllers benefit from the PIC18F14K50-I/SS through its integrated 3.3V regulator, USB VBUS sensing, and PWM-capable ECCP module for voltage/current regulation loops. Designers can implement proprietary USB fast-charge protocols or vendor-class devices that report battery telemetry to a host application. Compared to dedicated charging ICs, the 14K50 offers user-configurable behavior, display driving, and OTA firmware updates via the USB bootloader, useful in custom power bank products.
Recommended
Custom USB Vendor-Class Device
For proprietary USB vendor-class devices (industrial instruments, programming tools, custom test fixtures), the PIC18F14K50-I/SS supplies enough Flash (16 KB) and CPU performance (48 MHz) to implement bulk, interrupt, and isochronous endpoints with custom protocols. The MSSP peripheral adds SPI/I2C master capability, letting the same MCU drive external EEPROM, ADC, or display peripherals over a single USB cable. Microchip provides a free USB stack and example projects to shorten development cycles.
Recommended
Low-Cost USB Audio Class Device
The PIC18F14K50-I/SS can drive basic USB Audio Class 1.0 devices such as USB speakers, headsets, or audio adapters when paired with an external DAC. Its 16 KB Flash hosts the USB Audio class driver, while the ECCP module generates PWM audio at modest fidelity, or SPI drives an external DAC for higher quality. Sleep current around 20 nA enables always-connected USB audio dongles without draining the host. This is a budget alternative to USB audio codecs for educational and hobby markets.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F14K50-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F13K50-I/SS | PIC18LF14K50T-I/SS | PIC18F14K22-I/SS |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SSOP | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same |
| Program Memory (Flash) | 16 KB | 8 KB | 16 KB | 16 KB |
| RAM | 768 bytes | 512 bytes | 768 bytes | 512 bytes |
| USB Interface | USB 2.0 Full-Speed (on-chip) | USB 2.0 Full-Speed (on-chip) | USB 2.0 Full-Speed (on-chip) | No USB |
| Supply Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 1.8 V to 3.6 V | 1.8 V to 5.5 V |
| Maximum CPU Clock | 48 MHz | 48 MHz | 48 MHz | 64 MHz |
| ADC | 10-bit, 15 channels | 10-bit, 11 channels | 10-bit, 15 channels | 10-bit, 15 channels |
| I/O Pins | 16 | 14 | 16 | 16 |
Key Differentiators
- Integrated USB 2.0 full-speed transceiver with on-chip 3.3V regulator (vs PIC18F14K22-I/SS)
- 16 KB Flash vs 8 KB Flash in same package (vs PIC18F13K50-I/SS)
- nanoWatt XLP technology with ~20 nA sleep current (vs PIC18F4550)
Design Notes
USB enumeration failure is the most common first-time design issue with the PIC18F14K50-I/SS. Place a 200-ohm ferrite bead in series with VUSB from VBUS, and bypass the VUSB3V3 pin with at least 0.1uF and 10uF ceramic capacitors as specified in the Microchip datasheet. Also configure the USBTRIM register correctly to compensate for oscillator variation; leaving it at default can cause marginal signal integrity on some hosts.
When designing battery-powered USB devices using the PIC18F14K50-I/SS, leverage the on-chip VBUS detection by routing VBUS to an I/O pin and using interrupt-on-change to wake the MCU from sleep. This prevents the USB regulator and transceiver from drawing current until a host is connected. Combined with nanoWatt XLP sleep currents around 20 nA, coin-cell USB dongles can last multiple years on standby. Add a Schottky diode on VDD to prevent backfeed from the USB rail when running on battery.
Keep the D+ and D+ trace lengths matched and as short as possible from the PIC18F14K50-I/SS to the USB connector. Maintain 90-ohm differential impedance per USB 2.0 full-speed spec. Place the VUSB bypass capacitors within 2 mm of the VUSB3V3 pin and the VDD decoupling within 2 mm of pin 8. Route the crystal or external clock traces away from the USB differential pair to avoid coupling noise into the eye diagram.
For reliable USB communication with the PIC18F14K50-I/SS, ensure the 48 MHz USB clock source is stable before USB attach. The HFINTOSC accuracy is typically 1-2 percent which is acceptable for full-speed USB, but for high-volume production consider an external 12 MHz crystal to meet USB-IF compliance. Always check the USB eye diagram with a USB analyzer during qualification to catch signal-integrity issues early.
Compliance Information
RoHS and REACH compliant per Microchip product page. Industrial -40C to +85C temperature range. Not AEC-Q100 qualified; for automotive USB designs, consider PIC18F14K50-E/SS extended grade parts.
