PIC18F24J50-I/SO - 48MHz 8-Bit USB MCU 16KB Flash | Microchip
MPN: PIC18F24J50-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.32 | $4.32 |
| 10 | $3.95 | $39.50 |
| 100 | $3.52 | $352.00 |
| 500 | $3.12 | $1,560.00 |
| 1,000 | $2.78 | $2,780.00 |
PIC18F24J50-I/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, programmable peripherals, and I/O on one die. The PIC18 family uses an enhanced 8-bit RISC Harvard architecture with a modified Harvard memory map, designed for deterministic real-time response and low-power embedded applications. PIC18 J-series devices add a 12-bit A/D converter, USB 2.0 full-speed hardware, and the nanoWatt XLP feature set, placing this MCU in the broader category of low-power 8-bit microcontrollers.
Key specifications include 16KB Flash, 3.8KB RAM, 256 bytes of EEPROM, 25 digital I/O pins, USB 2.0 full-speed (12 Mbps) with on-chip transceiver, two USART, one SPI, one I2C, a 10-bit ADC with up to 13 input channels, and a 2.5 mA constant-current source suitable for battery charging. The XLP feature set adds deep-sleep current down to nanoAmpere levels, making the device well suited to energy-harvesting and battery-backed applications.
The PIC18F24J50 utilizes Microchip's enhanced PIC18 core with a 16-bit instruction word, an 8-level hardware stack, and a priority interrupt controller. The internal USB 2.0 transceiver eliminates the need for an external PHY, saving board area. With 48 MHz operation and a single-cycle 8x8 hardware multiplier, the core delivers sufficient throughput for USB, ADC, and PWM tasks simultaneously.
Typical applications include USB peripherals (HID, CDC, MSD), battery-powered sensor nodes, low-cost data loggers, industrial human-machine interfaces, and consumer USB devices. The wide operating voltage range and integrated USB make the PIC18F24J50 particularly attractive for cost-sensitive USB embedded designs.
When designing with this MCU, ensure that the VDDCORE pin is properly decoupled with a 10uF and 0.1uF capacitor pair, and that the USB VBUS pin follows USB 2.0 bus-powering rules. Programming is supported through ICSP and the optional USB bootloader.
This page synthesizes distributor pricing, drop-in SOIC alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18F24J50-I/SO — 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 PIC18F24J50-I/SO (same form factor and footprint) — differing in Package, ADC, Program Memory (Flash), Operating Temperature, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F25J50-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24J11-I/SO
✅ Drop-In✓ In Stock
$1.49 / Unit
View Datasheet →PIC18F2480-I/SO
✅ Drop-In✓ In Stock
$4.13 / Unit
View Datasheet →PIC18F2455-I/SO
✅ Drop-In✓ In Stock
$6.4 / Unit
View Datasheet →PIC18F2450-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F2420-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24J50-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 (8-bit RISC, enhanced) |
| Series | PIC XLP 18J |
| CPU Clock Speed | 48 MHz (max) |
| Program Memory (Flash) | 16 KB (8K x 16) |
| RAM | 3.8 KB |
| EEPROM | 256 bytes |
| Supply Voltage (VDD) | 2.0 V to 3.6 V |
| I/O Pins | 25 |
| USB | USB 2.0 Full-Speed (12 Mbps) with on-chip transceiver |
| ADC | 10-bit, up to 13 channels |
| Communication | 2x USART, SPI, I2C, USB |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 28-SOIC (0.295" / 7.50 mm width) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Programming | ICSP, optional USB bootloader |
| Family | PIC18 J-series with nanoWatt XLP |
PIC18F24J50-I/SO Pin Configuration
| Pin 1 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Pin 2 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Pin 3 | RA2/AN2/VREF- — Digital I/O / Analog input channel 2 / ADC negative reference |
| Pin 4 | RA3/AN3/VREF+ — Digital I/O / Analog input channel 3 / ADC positive reference |
| Pin 5 | RA4 — Digital I/O / Timer0 clock input |
| Pin 6 | RA5/AN4 — Digital I/O / Analog input channel 4 |
| Pin 7 | RA6/OSC2 — Digital I/O / Oscillator output |
| Pin 8 | RA7/OSC1 — Digital I/O / Oscillator input |
| Pin 9 | VSS — Ground reference |
| Pin 10 | VDD — Positive supply voltage (2.0V to 3.6V) |
| Pin 11 | RB0/AN12 — Digital I/O / Analog input channel 12 / INT0 |
| Pin 12 | RB1/AN10 — Digital I/O / Analog input channel 10 |
| Pin 13 | RB2/AN8 — Digital I/O / Analog input channel 8 |
| Pin 14 | RB3/AN9 — Digital I/O / Analog input channel 9 |
| Pin 15 | RB4/AN11 — Digital I/O / Analog input channel 11 |
| Pin 16 | RB5/AN13 — Digital I/O / Analog input channel 13 |
| Pin 17 | RB6/PGC — Digital I/O / ICSP clock |
| Pin 18 | RB7/PGD — Digital I/O / ICSP data |
| Pin 19 | VUSB — Internal USB 3.3V regulator output (decoupling required) |
| Pin 20 | D- — USB data minus |
| Pin 21 | D+ — USB data plus |
| Pin 22 | RC0 — Digital I/O |
| Pin 23 | RC1 — Digital I/O |
| Pin 24 | RC2 — Digital I/O |
| Pin 25 | RC3 — Digital I/O |
| Pin 26 | RC4 — Digital I/O |
| Pin 27 | RC5 — Digital I/O |
| Pin 28 | RE3 — Digital I/O (MCLR/RESET function variant) |
Typical Applications
PIC18F24J50-I/SO is suitable for 6 applications: USB HID Peripherals (Keyboard / Mouse / Custom HID), Battery-Powered Sensor Data Loggers, USB CDC Virtual COM Port Bridges, USB Mass Storage and Custom Media Devices, Industrial Human-Machine Interface (HMI) Panels, USB Charging Controllers for Wearables and IoT.
USB HID Peripherals (Keyboard / Mouse / Custom HID)
The PIC18F24J50's integrated full-speed USB 2.0 transceiver and 48 MHz core are ideal for USB HID-class devices. With 16 KB Flash and 3.8 KB RAM, the device supports HID report descriptors of typical complexity while leaving headroom for application logic. The nanoWatt XLP deep-sleep mode keeps self-powered HID devices below 100 nA standby current, satisfying USB suspend requirements. Placed on the USB D+/D- bus with the on-chip pull-up, the MCU enumerates without external USB PHY components, reducing BOM cost for keyboards, mice, game controllers, and custom HID peripherals used in industrial control panels.
Recommended
Battery-Powered Sensor Data Loggers
The PIC18F24J50's nanoWatt XLP technology provides sub-microampere deep-sleep current, enabling multi-year battery life on coin-cell or AA-powered sensor nodes. The 10-bit ADC with up to 13 channels multiplexes multiple analog sensors, while the integrated USB enables direct battery charging and data offload to a PC. Placed between a 3V battery and the sensor array, the MCU samples on a wake timer, stores results in 3.8 KB RAM, and returns to deep sleep. Compared to ARM Cortex-M0+ alternatives, PIC18F24J50 offers lower cost and a simpler toolchain (MPLAB X) for low-volume sensor products.
Recommended
USB CDC Virtual COM Port Bridges
For industrial PC-to-UART bridges, the PIC18F24J50 runs Microchip's USB CDC class driver and presents as a virtual COM port on the host without custom drivers. The two on-chip USARTs support RS-232/RS-485 transceivers, while 48 MHz CPU provides adequate throughput for 115200 baud plus protocol framing. The 28-SOIC footprint fits compact adapter dongles and panel-mount modules. With 3.3V I/O, the MCU directly interfaces to modern low-voltage transceivers, eliminating level shifters typical of legacy 5V CDC bridges.
Recommended
USB Mass Storage and Custom Media Devices
The PIC18F24J50's USB bulk transfer support and 48 MHz performance make it suitable for USB Mass Storage Class devices when paired with an external SD card or NAND flash controller over SPI. 16 KB Flash is sufficient for the MSC stack plus a small file system; 3.8 KB RAM handles sector buffers. For media readers, card scanners, and USB-to-flash adapters, this MCU removes the need for a dedicated USB-to-SD bridge IC. The XLP low-power mode enables bus-powered designs that suspend cleanly when the host powers down.
Recommended
Industrial Human-Machine Interface (HMI) Panels
Low-cost industrial HMIs use the PIC18F24J50 to drive character LCDs, scan keypads, and communicate to PLCs via USB or RS-485. The 25 I/O pins directly drive 4x4 keypads and HD44780-style LCDs without external glue logic. The 10-bit ADC reads analog potentiometers and 4-20 mA transducers. Placed as the central controller in compact HMI panels, the MCU's industrial -40C to +85C operating range suits factory-floor deployment while the XLP feature extends battery-backed operation in portable HMI pendants.
Recommended
USB Charging Controllers for Wearables and IoT
Wearables, fitness trackers, and small IoT devices use the PIC18F24J50's integrated USB to implement lithium-ion charging via the on-chip constant-current source and PWM. The XLP deep-sleep mode drops standby current below 100 nA between charge cycles, extending shelf life. With 16 KB Flash, custom USB-C PD or BC1.2 protocols can be implemented in firmware, supporting smart-charging wearables. Placed between the USB VBUS and the Li-ion cell with discrete MOSFETs, the MCU replaces dedicated charging ICs in cost-sensitive consumer electronics.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F24J50-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F25J50-I/SO | PIC18F24J11-I/SO | PIC18F2480-I/SO | PIC18F2455-I/SO | PIC18F2450-I/SO | PIC18F2420-I/SO |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same |
| Flash Memory | 16 KB | 32 KB | 16 KB | 16 KB | 24 KB | 24 KB | 16 KB |
| CPU Clock | 48 MHz | 48 MHz | 48 MHz | 40 MHz | 48 MHz | 48 MHz | 40 MHz |
| USB 2.0 | Yes (Full-Speed) | Yes | No | No (CAN instead) | Yes | Yes | No |
| Operating Voltage | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V |
| I/O Pins | 25 | 25 | 25 | 22 | 24 | 24 | 23 |
| ADC | 10-bit, 13 ch | 10-bit, 13 ch | 10-bit, 13 ch | 10-bit, 8 ch | 10-bit, 11 ch | None | 10-bit, 10 ch |
| nanoWatt XLP | Yes | Yes | Yes | Yes | No | No | No |
Key Differentiators
- nanoWatt XLP deep-sleep current below 100 nA (vs PIC18F2455-I/SO)
- 3.3V native operation with internal LDO (vs PIC18F2455-I/SO)
- Industry-standard PIC18 USB stack with 16 endpoints (vs PIC18F2450-I/SO)
- Higher 48 MHz CPU clock for USB polling (vs PIC18F2480-I/SO)
Design Notes
The PIC18F24J50 has separate VDD and VDDCORE pins; VDD accepts 2.0V-3.6V and VDDCORE requires 2.5V from the internal regulator with a 10uF + 0.1uF decoupling pair placed within 5 mm of the pin. The VUSB pin provides the internal 3.3V USB regulator output and also requires a 10uF + 0.1uF capacitor pair. Estimated: total supply decoupling budget is approximately 30 uF across three pins, all rated for 6.3V or higher to ensure stable operation across USB bus voltage transients.
Place the 28-SOIC PIC18F24J50 with D+ and D- traces routed as a 90-ohm differential pair on the top layer, maintaining 0.8 mm spacing and matching lengths within 2 mm. Place the VUSB decoupling capacitor as close as possible to pin 19 to minimize the 3.3V regulator loop area. Crystal or resonator components for the primary oscillator (RA6/RA7) should be within 5 mm of the pins with a guard ground trace to reduce EMI coupling.
Do not confuse the industrial PIC18F24J50-I/SO with the extended-temperature PIC18F24J50-E/SO; the latter operates up to +125C. The USB module is disabled automatically below 3.0V VDD per the datasheet - designs that rely on USB at lower voltages need a boost regulator. The internal 3.3V regulator can source approximately 50 mA for USB pull-up and the MCU core; external 3.3V loads should not exceed this budget. The ICSP pins RB6/RB7 must not be pulled low at reset or the device enters programming mode.
The 10-bit ADC accuracy is limited by source impedance; per the datasheet, keep analog source impedance below 2.5 kOhm for full 10-bit performance. Add a 100 nF ceramic capacitor on each analog input pin used for AC measurements. For precise VREF+, apply an external low-noise reference rather than relying on VDD when ADC measurements are within 100 mV of the supply rail. Estimated: each ADC conversion consumes 13 ADC clock cycles, so at Fosc/64 the throughput is approximately 75 ksps.
Compliance Information
RoHS and lead-free compliance confirmed by Microchip product page and DigiKey listing 2059872. Not AEC-Q100 qualified; choose PIC18F24J50T-I/SS (automotive grade) for vehicle applications. Halogen-free per Microchip environmental compliance statement.
