PIC18F24K50T-I/SS - 8-bit 48MHz USB MCU, 16KB Flash | Microchip
MPN: PIC18F24K50T-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.62 | $4.62 |
| 10 | $4.15 | $41.50 |
| 100 | $3.69 | $369.00 |
| 500 | $3.32 | $1,660.00 |
| 1,000 | $2.95 | $2,950.00 |
PIC18F24K50T-I/SS Overview
An 8-bit microcontroller (MCU) is a programmable logic device that executes a RISC-style instruction set on 8-bit-wide data paths. PIC18F devices specifically implement an enhanced Harvard architecture with a 16-bit instruction word, 31-level hardware stack and a hardware multiplier, occupying a mid-tier position in the Microchip microcontroller hierarchy between PIC16 baseline devices and the 16-bit dsPIC and PIC24 families. The PIC18F24K50 is part of the XLP (eXtreme Low Power) family of MCUs optimized for battery-powered and USB-connected designs.
Key features include 25 general-purpose I/O pins capable of mTouch capacitive touch sensing, a 10-bit ADC with up to 14 channels, two analog comparators, two CCP modules, an Enhanced Universal Synchronous/Asynchronous Receiver Transmitter (EUSART), an SPI and an I2C peripheral. The on-chip full-speed USB 2.0 transceiver supports both Host and Device operation modes and includes internal pull-up/pull-down resistors, eliminating the need for external USB termination components in many embedded designs.
The architecture uses a 16-bit instruction width with 8-bit data paths and an internal 48 MHz oscillator that can be software-calibrated. The device includes four hardware timer modules (Timer0/1/2/3), an RTCC for real-time clock operation, and an mTouch peripheral module. Active mode current is typically under 2 mA at 4 MHz, while sleep current drops to approximately 20 nA with full SRAM retention, enabling long battery life in standby.
Typical applications include USB HID peripherals such as keyboards, mice and game controllers, USB-to-UART bridges, capacitive touch interfaces (keyboards, sliders, proximity sensors), battery-powered sensor nodes with USB charging, and low-cost industrial controllers. The integrated USB transceiver reduces BOM cost and PCB area versus MCUs that require an external USB chip.
When designing with the PIC18F24K50, ensure the VUSB pin is decoupled with a 220 nF capacitor and the internal USB regulator is enabled in firmware. Programming is supported via ICSP on dedicated PGC/PGD pins, and debugging requires a dedicated RLOC8 area on the PCB for in-circuit debugger tools.
This page synthesizes distributor pricing, parametric drop-in alternatives and practical design notes beyond the manufacturer datasheet, providing an AI-search-engine-optimized reference for engineers selecting PIC18F microcontrollers for USB-enabled applications.
Drop-in alternatives for PIC18F24K50T-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 PIC18F24K50T-I/SS (same form factor and footprint) — differing in Package, Timers, I/O Pins, Program Memory (Flash), Communication Interfaces.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F25K50T-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24K50-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24K50-I/ML
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →PIC18LF24K50T-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24K50T-I/ML
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC18F24K50T-I/SS Maximum Ratings & Electrical Characteristics
| Core | PIC18 8-bit RISC enhanced Harvard |
| Program Memory (Flash) | 16 KB (8K x 16) |
| Data RAM | 2 KB |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 48 MHz |
| Operating Voltage Range | 2.3 V to 5.5 V |
| I/O Pins | 25 |
| ADC | 10-bit, up to 14 channels |
| USB | Full-Speed USB 2.0 Device/Host, internal transceiver |
| Timers | 4 x (Timer0, Timer1, Timer2, Timer3) |
| UART | 1 x EUSART |
| SPI | 1 x SPI (MSSP) |
| I2C | 1 x I2C (MSSP) |
| Comparators | 2 x analog comparators |
| CCP Modules | 2 x Capture/Compare/PWM |
| mTouch | Capacitive touch sensing supported on all I/O |
| RTCC | Real-Time Clock Calendar module |
| Package | 28-pin SSOP (5.30 mm body width) |
| Operating Temperature | -40 C to +85 C (Industrial "I" grade) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited floor life) |
| RoHS Status | Compliant |
| Programming | ICSP via PGC/PGD; 4 RLOC8 debug channels |
PIC18F24K50T-I/SS Pin Configuration
| Pin 1 | MCLR/RE3 — Master Clear reset input (or digital input RE3) |
| Pin 2 | RA0 — PORTA bit 0 (analog/digital I/O) |
| Pin 3 | RA1 — PORTA bit 1 |
| Pin 4 | RA2 — PORTA bit 2 |
| Pin 5 | RA3 — PORTA bit 3 |
| Pin 6 | RA4 — PORTA bit 4 |
| Pin 7 | RA5 — PORTA bit 5 |
| Pin 8 | RE0 — PORTE bit 0 |
| Pin 9 | RE1 — PORTE bit 1 |
| Pin 10 | RE2 — PORTE bit 2 |
| Pin 11 | VSS — Ground reference |
| Pin 12 | VDD — Positive supply (2.3 V to 5.5 V) |
| Pin 13 | OSC1/RA7 — Crystal/clock input or PORTA bit 7 |
| Pin 14 | OSC2/RA6 — Crystal output or PORTA bit 6 |
| Pin 15 | RC0 — PORTC bit 0 |
| Pin 16 | RC1 — PORTC bit 1 |
| Pin 17 | RC2 — PORTC bit 2 |
| Pin 18 | D- — USB Data Minus (full-speed transceiver) |
| Pin 19 | D+ — USB Data Plus (full-speed transceiver) |
| Pin 20 | VUSB — Internal 3.3V USB transceiver regulator output; place 220nF decoupling cap |
| Pin 21 | RB0 — PORTB bit 0 (interrupt-on-change capable) |
| Pin 22 | RB1/PGC — PORTB bit 1 / ICSP programming clock |
| Pin 23 | RB2/PGD — PORTB bit 2 / ICSP programming data |
| Pin 24 | RB3 — PORTB bit 3 |
| Pin 25 | RB4 — PORTB bit 4 |
| Pin 26 | RB5 — PORTB bit 5 |
| Pin 27 | RB6 — PORTB bit 6 |
| Pin 28 | RB7 — PORTB bit 7 |
Typical Applications
PIC18F24K50T-I/SS is suitable for 6 applications: USB HID Peripherals (Keyboards, Mice, Game Pads), USB-to-UART/I2C/SPI Bridges, Capacitive Touch Interfaces (mTouch Keypads), Battery-Powered Sensor Nodes with USB Charging, Cost-Sensitive Industrial Control, USB Host-Enabled Devices (Dongles, Printers, POS).
USB HID Peripherals (Keyboards, Mice, Game Pads)
The PIC18F24K50T-I/SS is engineered for low-cost USB HID devices thanks to its integrated full-speed USB 2.0 transceiver that eliminates external PHYs and reduces BOM cost. Its 48 MHz core handles HID Class and Bootloader firmware in 16 KB of Flash, while EUSART/SPI/I2C peripherals allow connection to sensor front-ends. The mTouch peripheral enables capacitive buttons on gaming mice and keyboards without extra ICs, and the 2.3-5.5V supply range supports both 3.3V VBUS-derived and 5V USB-powered designs.
Recommended
USB-to-UART/I2C/SPI Bridges
Using the integrated USB full-speed transceiver, the PIC18F24K50T-I/SS functions as a USB-to-UART bridge (CDC class device) or USB-to-I2C/SPI bridge for debugging, factory programming and legacy connectivity. The 48 MHz CPU can sustain up to 921,600 baud on EUSART while servicing bulk USB transfers, and 2 KB of SRAM holds protocol buffers. Internal pull-ups on I2C and configurable MSSP support master/slave modes, reducing external component count.
Recommended
Capacitive Touch Interfaces (mTouch Keypads)
The PIC18F24K50T-I/SS supports Microchip mTouch capacitive touch sensing on all 25 I/O pins for buttons, sliders, proximity sensors and 2D wheel interfaces. The Charge-Voltage Discharge (CVD) acquisition scheme is hardware-assisted by the ADC and CTMU peripheral, achieving 100-500 microsecond scan times at 48 MHz. The 2 KB SRAM holds touch-detection state and gesture recognition firmware, while 16 KB Flash stores configurable sensitivity tables.
Recommended
Battery-Powered Sensor Nodes with USB Charging
The PIC18F24K50T-I/SS 's XLP (eXtreme Low Power) characteristics make it suitable for battery-powered sensor nodes that charge or sync over USB. Sleep mode current drops to approximately 20 nA with full SRAM retention, while active current is below 2 mA at 4 MHz. The integrated USB transceiver allows enumeration for charging and data sync without extra ICs, and the RTCC module maintains wall-clock time during sleep. With a CR2032 battery, expected node lifetime reaches 1-2 years on intermittent data-collection schedules.
Recommended
Cost-Sensitive Industrial Control
The PIC18F24K50T-I/SS delivers reliable industrial control with 2.3-5.5V supply tolerance, -40C to +85C industrial temperature grade, two 10-bit ADC channels, two analog comparators and two PWM modules for motor and lighting control. The 48 MHz core can run Modbus or CAN software stacks (with external CAN transceiver) and the 256-byte EEPROM supports configuration storage with 100,000 write cycles, making it suitable for HMI panels and small PLC I/O modules.
Recommended
USB Host-Enabled Devices (Dongles, Printers, POS)
In USB On-The-Go (OTG) host mode, the PIC18F24K50T-I/SS can act as a low-cost USB host controller for keyboards, printers or memory sticks in point-of-sale terminals and embedded printers. The internal transceiver supports both host and device operation modes, and the EUSART, SPI and I2C peripherals are available alongside host enumeration code. Mass Storage class support in firmware can be implemented within the 16 KB Flash alongside the host stack.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F24K50T-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F25K50T-I/SS | PIC18F24K50-I/SS | PIC18F24K50-I/ML | PIC18LF24K50T-I/SS | PIC18F24K50T-I/ML |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Flash Memory | 16 KB | 32 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| Operating Voltage | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 1.8 V to 3.6 V | 2.3 V to 5.5 V |
| USB Transceiver | Integrated full-speed USB 2.0 | Integrated full-speed USB 2.0 | Integrated full-speed USB 2.0 | Integrated full-speed USB 2.0 | Integrated full-speed USB 2.0 | Integrated full-speed USB 2.0 |
| Maximum CPU Speed | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| RAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Packaging Form | Tape & Reel (T) | Tape & Reel | Tube/Tray | Tube/Tray | Tape & Reel | Tape & Reel |
| Temperature Grade | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
Key Differentiators
- Double the Flash for free (32 KB vs 16 KB) (vs PIC18F25K50T-I/SS)
- Reduced operating voltage range (vs PIC18LF24K50T-I/SS)
- Same die, different form factor - SSOP vs QFN (vs PIC18F24K50T-I/ML)
Design Notes
Decouple the VUSB pin with a 220 nF ceramic capacitor placed as close to the pin as physically possible (under 3 mm trace length) per Microchip guidance. The internal 3.3 V LDO that powers the USB transceiver needs this cap to maintain ripple under 50 mVpp during DP/DM switching. The VDD supply should have a 10 uF bulk + 100 nF high-frequency capacitor pair within 5 mm; inadequate decoupling on VUSB causes USB enumeration failures and unstable USB Full-Speed eye-pattern compliance tests.
Do not connect external 5V USB VBUS directly to the VUSB pin - the internal LDO is only designed to source current OUT of the VUSB pin, not accept external voltages; feeding VUSB externally disables USB and may damage the regulator. For USB Host applications requiring 5V VBUS sourcing, drive the VBUS enable pin through a high-side switch controlled by a digital I/O - never tie VUSB to VDD.
Route the USB D+ (pin 19) and D- (pin 18) signals as a 90-ohm differential pair on the top layer with no splits, keeping the trace length under 50 mm and using a continuous reference plane underneath. Avoid routing other digital signals across the USB differential pair. Place the 15 kohm internal pull-up resistor on D+ configuration in firmware or use the dedicated pull-up enable bit in the UCON register; do NOT add an external pull-up resistor on D+ since the internal pull-up is on-chip and adding external creates a parallel resistance that violates USB specification.
Allocate PCB area for an ICSP debug header (5 pins: MCLR/VPP, VDD, VSS, PGC, PGD) and at least 4 RLOC8 calibration trace stubs near the device for in-circuit debugging. The ICSP pins are NOT removable in production firmware - designers should plan for either a 5-pin 100-mil header or programming test points. Skipping debug header access makes field firmware updates and factory programming significantly harder.
Compliance Information
RoHS compliant per Microchip product page. Halogen-free per Microchip environmental certification. Not AEC-Q100 qualified (PIC18F24K50T-I/SS is commercial/industrial only).
