PIC18F45K50-I/MV - 8-bit 48MHz 32KB Flash USB MCU | Microchip
MPN: PIC18F45K50-I/MV ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.85 | $3.85 |
| 10 | $3.5 | $35.00 |
| 100 | $2.95 | $295.00 |
| 500 | $2.55 | $1,275.00 |
| 1,000 | $2.2 | $2,200.00 |
PIC18F45K50-I/MV Overview
A microcontroller (MCU) is a single-chip computer that combines a CPU core, non-volatile program memory (Flash), volatile working memory (RAM), and a rich set of on-chip peripherals (timers, ADC/DAC, communication interfaces) onto one silicon die. Within the broader product hierarchy, PIC18F45K50 belongs to the 8-bit PIC18 family -> microcontrollers -> integrated circuits -> semiconductors. Its USB 2.0 Full-Speed (12 Mbps) peripheral sets it apart from non-USB PIC18 cousins and makes it a logical choice for embedded hosts and devices that previously required an external USB transceiver.
Key features include an 8x8 hardware multiplier accelerating arithmetic, an internal 48 MHz oscillator tunable against the USB host clock via Active Clock Tuning (eliminates an external crystal in many USB applications), and the nanoWatt XLP technology delivering sleep currents below 50 nA typical. CIP (Core Independent Peripherals) such as CWG, NCO, and DSM offload tasks from the core, while the 32 KB self-write-capable Flash supports bootloader-style field updates without an external programmer.
The 40-pin UQFN-EP (5x5 mm) package exposes a thermal pad that improves heat extraction at the higher 48 MHz clock, and the industrial -40C to +85C operating range covers most commercial and industrial embedded products. Migration from the older PIC18F4550 family is pin-compatible for USB D+/D- and most digital I/O, easing retrofits.
Typical applications include USB HID/CDC peripherals (mice, keyboards, custom sensors), USB-to-UART bridges, low-power data loggers with on-board ADC, industrial control nodes with RS-485, and consumer appliances with capacitive touch via the CTMU peripheral. Pair the device with a Microchip MCP2200 or direct USB bus-power design.
When designing in this part, allocate sufficient decoupling (100 nF plus 1 uF bulk within 5 mm of the VDD pins) and tie the exposed pad to a continuous ground plane for thermal and signal-integrity reasons. Designers migrating from PIC18F4550 must update the Configuration Words because the oscillator and USB settings differ between the two families.
Drop-in alternatives for PIC18F45K50-I/MV — 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 PIC18F45K50-I/MV (same form factor and footprint) — differing in Core, Operating Temperature, Package, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F45K50T-I/MV
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →PIC18F45K50-I/MV Maximum Ratings & Electrical Characteristics
| Core | PIC18 8-bit RISC |
| Program Memory (Flash) | 32 KB (16K x 16) |
| RAM | 2 KB |
| EEPROM | 256 B |
| Maximum CPU Speed | 48 MHz (12 MIPS) |
| Operating Voltage Range | 2.5 V to 5.5 V |
| I/O Pins | 35 |
| ADC | 10-bit, up to 25 channels |
| DAC | 5-bit, 1 channel |
| USB | USB 2.0 Full-Speed (12 Mbps) device |
| Timers | 4 x 8/16-bit |
| CCP/ECCP Modules | 3 (2 CCP + 1 ECCP) |
| EUSART / SPI / I2C | 1 / 1 / 1 |
| CTMU (Capacitive Touch) | Yes |
| Hardware Multiplier | 8 x 8 single-cycle |
| Package | 40-pin UQFN-EP (5x5 mm) |
| Operating Temperature | -40C to +85C (Industrial) |
| Mounting Type | Surface Mount |
| MSL Level | 1 |
| RoHS Status | Compliant |
PIC18F45K50-I/MV Pin Configuration
| Pin 1 | RA2/AN2 — Port A bit 2 / Analog input 2 / CVREF |
| Pin 2 | RA3/AN3 — Port A bit 3 / Analog input 3 / VREF+ |
| Pin 3 | RA4 — Port A bit 4 |
| Pin 4 | RA5/AN4 — Port A bit 5 / Analog input 4 |
| Pin 5 | RA6 — Port A bit 6 / OSC2 |
| Pin 6 | RA7 — Port A bit 7 / OSC1 |
| Pin 7 | VSS — Ground reference |
| Pin 8 | VDD — Positive supply voltage |
| Pin 9 | RB0/AN12 — Port B bit 0 / Analog input 12 / INT0 |
| Pin 10 | RB1/AN10 — Port B bit 1 / Analog input 10 |
| Pin 11 | RB2/AN8 — Port B bit 2 / Analog input 8 |
| Pin 12 | RB3/AN9 — Port B bit 3 / Analog input 9 / CTMU |
| Pin 13 | RB4 — Port B bit 4 |
| Pin 14 | RB5 — Port B bit 5 |
| Pin 15 | RB6 — Port B bit 6 / PGC (ICSP clock) |
| Pin 16 | RB7 — Port B bit 7 / PGD (ICSP data) |
| Pin 17 | VDD — Positive supply voltage (second pin) |
| Pin 18 | VSS — Ground reference (second pin) |
| Pin 19 | RC0 — Port C bit 0 |
| Pin 20 | RC1 — Port C bit 1 |
| Pin 21 | RC2 — Port C bit 2 |
| Pin 22 | RC3 — Port C bit 3 |
| Pin 23 | RC4 — Port C bit 4 |
| Pin 24 | RC5 — Port C bit 5 |
| Pin 25 | RC6 — Port C bit 6 / TX/CK |
| Pin 26 | RC7 — Port C bit 7 / RX/DT |
| Pin 27 | RE3 — Port E bit 3 / MCLR |
| Pin 28 | RD0 — Port D bit 0 |
| Pin 29 | RD1 — Port D bit 1 |
| Pin 30 | RD2 — Port D bit 2 |
| Pin 31 | RD3 — Port D bit 3 |
| Pin 32 | RD4 — Port D bit 4 |
| Pin 33 | RD5 — Port D bit 5 |
| Pin 34 | RD6 — Port D bit 6 |
| Pin 35 | RD7 — Port D bit 7 |
| Pin 36 | D+ — USB D+ data line |
| Pin 37 | D- — USB D- data line |
| Pin 38 | VUSB — USB internal transceiver supply |
| Pin 39 | VSS — Ground reference (third pin) |
| Pin 40 | VDD — Positive supply voltage (third pin) |
Typical Applications
PIC18F45K50-I/MV is suitable for 6 applications: USB HID Peripheral (Mouse, Keyboard, Custom HID), USB-to-UART Bridge / CDC Virtual COM Port, Low-Power Data Logger with 10-bit ADC, Industrial Control Node (RS-485, Modbus), Consumer Appliance with Capacitive Touch (CTMU), USB Bootloader-Programmable Sensor Hub.
USB HID Peripheral (Mouse, Keyboard, Custom HID)
The PIC18F45K50-I/MV's integrated USB 2.0 Full-Speed transceiver and Active Clock Tuning make it ideal for USB HID peripherals where BOM cost and PCB area must be minimized. Active Clock Tuning lets the internal 48 MHz oscillator self-calibrate against the USB SOF packets from the host, removing the need for an external 20 MHz crystal and saving $0.20+ in BOM. With 32 KB Flash and 2 KB RAM, the device runs standard USB HID class drivers in ROM-friendly C code; 35 I/O pins handle buttons, scroll wheels, and LED indicators. Place a 100 nF decoupling capacitor within 5 mm of VDD and tie the exposed pad to GND for EMI compliance with USB 2.0 radiated emissions.
Recommended
USB-to-UART Bridge / CDC Virtual COM Port
The PIC18F45K50-I/MV runs Microchip's USB CDC class firmware to expose a virtual COM port over USB Full-Speed, replacing legacy FTDI bridges. With 48 MHz CPU and 12 MIPS throughput, it handles 921,600 baud UART traffic plus USB endpoint handshaking with negligible latency, while 2 KB RAM accommodates 64-byte CDC packet buffers. The 5-bit DAC supports TX/RX activity LED indication without extra GPIO, and the CTMU peripheral enables push-button BOOT/reset logic. Power is drawn directly from the USB VBUS rail (5 V) so no separate regulator is needed when VDD is within 2.5-5.5 V.
Recommended
Low-Power Data Logger with 10-bit ADC
The PIC18F45K50-I/MV's eXtreme Low Power (XLP) technology delivers sleep currents below 50 nA typical, making it suitable for battery-powered data loggers sampling sensors over months. The 10-bit ADC with up to 25 channels reads thermistors, photocells, or 4-20 mA loop signals; 256 B EEPROM stores calibration constants non-volatilely. The 32 KB Flash supports multi-week circular buffer logging with timestamp from the 32 kHz secondary oscillator. Use nanoWatt XLP sleep mode between ADC conversions to extend CR2032 battery life to 2+ years at 1 sample/minute.
Recommended
Industrial Control Node (RS-485, Modbus)
The PIC18F45K50-I/MV's enhanced USART with auto-baud detection supports RS-485 Modbus RTU nodes at 115,200 baud with hardware address-match wake-up, reducing firmware overhead. The 5-bit DAC drives a 4-20 mA loop for legacy analog sensor outputs, while 35 I/O pins handle opto-isolated digital inputs and relay drivers. Industrial -40C to +85C operation tolerates factory-floor temperatures. ECCP modules generate PWM for proportional valve control; pair with an external MAX485 transceiver and 1.5 kV isolation barrier for full EMC immunity per IEC 61800-3.
Recommended
Consumer Appliance with Capacitive Touch (CTMU)
The PIC18F45K50-I/MV integrates the CTMU (Charge Time Measurement Unit) peripheral that measures capacitance changes on touch pads using only an external copper pad and a few passive components - no dedicated touch IC needed. Combined with 32 KB Flash for gesture decoding and the 10-bit ADC for slider position sensing, the device replaces 3-4 discrete ICs in microwave ovens, induction cooktops, or smart-home control panels. The exposed pad on the UQFN-EP package handles the slightly higher dissipation when USB is active during firmware updates via the appliance's service port.
Recommended
USB Bootloader-Programmable Sensor Hub
The PIC18F45K50-I/MV's self-write-capable Flash plus integrated USB enables a true USB bootloader without an external programmer: end customers can update firmware in the field via the USB port. The 32 KB Flash reserves up to 8 KB for the bootloader, leaving 24 KB for application code. With 256 B EEPROM for configuration storage and the 32 kHz secondary oscillator for RTC-style timekeeping, the device serves as a USB-tethered sensor hub aggregating I2C/SPI sensor data and streaming it over USB CDC or HID endpoints. Microchip's MPLAB X IDE supports one-click USB bootloader deployment.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F45K50-I/MV — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F45K50T-I/MV | PIC18F45K50-I/PT |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-pin UQFN-EP (5x5 mm) | 40-pin UQFN-EP (5x5 mm) | 44-pin TQFP |
| Flash Memory | 32 KB | 32 KB | 32 KB |
| RAM | 2 KB | 2 KB | 2 KB |
| Maximum CPU Speed | 48 MHz (12 MIPS) | 48 MHz (12 MIPS) | 48 MHz (12 MIPS) |
| USB Peripheral | USB 2.0 Full-Speed integrated | USB 2.0 Full-Speed integrated | USB 2.0 Full-Speed integrated |
| Operating Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| ADC Channels | 25 x 10-bit | 25 x 10-bit | 25 x 10-bit |
| I/O Pins | 35 | 35 | 36 (44-pin TQFP exposes 1 more) |
Key Differentiators
- Integrated USB 2.0 Full-Speed with Active Clock Tuning (vs PIC18F45K22-I/MV)
- NanoWatt XLP technology with sub-50 nA sleep current (vs PIC18F4550-I/P)
- 5-bit DAC and CTMU on-chip (vs PIC18F45K20-I/PT)
Design Notes
Place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD pin (pins 8, 17, 40) and a single 1 uF bulk capacitor near the package. The PIC18F45K50-I/MV has three VDD pins; failure to bypass all three may cause erratic USB enumeration or brownouts at high CPU loads. For USB bus-powered designs, add a 10 uF tantalum or ceramic bulk on VBUS to meet USB 2.0 inrush-current requirements (10 uF max effective capacitance on VBUS).
The 40-pin UQFN-EP package exposes a thermal pad on the underside (pin 41 in the pinout diagram) that MUST be soldered to a continuous ground plane with thermal vias for heat extraction and signal integrity. Use an array of 9-12 thermal vias (0.3 mm drill, 0.5 mm pitch) under the pad tied to the inner ground plane. Without the EP soldered, junction temperature can exceed 100C at 48 MHz with USB active, leading to USB packet errors.
Configuration Words must be updated when migrating code from PIC18F4550 to PIC18F45K50; oscillator and USB configuration bits differ between the two families even though the silicon is largely pin-compatible. Use MPLAB X IDE's Code Configurator or MCC (MPLAB Code Configurator) to regenerate the Configuration Words rather than copying from the older project. Failing to do so may result in the USB peripheral failing to enumerate or the CPU running at the wrong clock rate.
Route the USB D+ and D- traces as a 90-ohm differential pair with matched length (within 150 mil) directly from pins 36-37 to the USB connector. Keep the pair away from clock traces and switching regulators; place a common-mode choke (e.g., Würth 742792096) for EMI compliance per USB 2.0 radiated-emission limits. The on-chip pull-up resistor on D+ should NOT be enabled in software until VUSB is stable (typically 50 ms after VDD reaches 3.0 V) to avoid enumeration glitches.
Compliance Information
RoHS and REACH compliant per Microchip product page and DigiKey/Mouser listings. Lead-free and halogen-free per the package material declaration. Not AEC-Q100 qualified (automotive); choose PIC18F45K50-E/MV for extended-temperature or PIC18F46K50-E/MV for AEC-Q100-grade automotive applications. USB 2.0 Full-Speed compliance tested per USB-IF procedures (TID varies by firmware).
