PIC18F24J50-I/SS - 48MHz USB MCU 16KB Flash 28-SSOP | Microchip
MPN: PIC18F24J50-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.96 | $5.96 |
| 10 | $5.42 | $54.20 |
| 100 | $4.78 | $478.00 |
| 500 | $4.25 | $2,125.00 |
| 1,000 | $3.85 | $3,850.00 |
PIC18F24J50-I/SS Overview
What is a PIC18 USB microcontroller? It is a low-power, high-performance 8-bit RISC microcontroller with an integrated USB 2.0 full-speed transceiver and endpoint RAM, designed to drop into embedded designs that previously required an external USB serializer. Within Microchip's taxonomy, the PIC18F24J50 belongs to the PIC18 family, then the PIC18J sub-family (3.3V core with nanoWatt XLP technology), then the PIC18F2xJ50 USB group (28/44-pin variants).
Key differentiating features include nanoWatt XLP deep-sleep modes drawing as little as 20 nA, an on-chip full-speed USB 2.0 transceiver that eliminates external PHY chips, and an internal 31 kHz to 8 MHz oscillator with PLL flexibility for either low-power crystal-free operation or 48 MHz USB-accurate timing. The 10-bit ADC with up to 13 channels and the Enhanced Capture/Compare/PWM (ECCP) module support mixed-signal and motor-control peripherals without external glue logic.
Typical applications include USB HID peripherals such as keyboards, mice, and game controllers, USB-to-UART bridges, low-power battery-powered sensor nodes leveraging XLP sleep modes, and industrial instrumentation with USB diagnostics ports. The 28-pin SSOP footprint suits compact handheld enclosures.
When designing with this device, place the 4.7uF bulk and 0.1uF decoupling capacitors as close to Vdd/Vss pairs as possible and observe the 3.3V core voltage requirement, even when I/O lines talk to 5V logic. The internal regulator must be enabled via the CONFIG3L register or the part will not start.
This page consolidates distributor pricing, drop-in SSOP-28 alternatives from the PIC18F2xJ50 family, USB-capable cross-vendor options, and practical layout notes that go beyond the manufacturer datasheet to accelerate your design.
Drop-in alternatives for PIC18F24J50-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 PIC18F24J50-I/SS (same form factor and footprint) — differing in Family, Operating Temperature, Package, ADC, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F25J50-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F26J50-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF24J50-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F24J50T-I/SS
✅ Drop-In✓ In Stock
$3.85 / Unit
View Datasheet →PIC18F24J10-I/SS
✅ Drop-In✓ In Stock
$2.45 / Unit
View Datasheet →PIC18F24J50-I/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18, 8-bit RISC |
| Family | PIC18F2xJ50 (USB, nanoWatt XLP) |
| Maximum CPU Frequency | 48 MHz (12 MIPS) |
| Program Memory (Flash) | 16 KB (8K x 16 words) |
| Data SRAM | 3.8 KB |
| USB Interface | USB 2.0 Full-Speed (12 Mbps), on-chip transceiver |
| I/O Pins | 25 |
| ADC | 10-bit, up to 13 channels |
| Core Operating Voltage (Vdd) | 2.0 V to 3.6 V |
| I/O Supply Voltage (Vddio) | 2.0 V to 3.6 V (5V tolerant inputs) |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Package | 28-pin SSOP (Shrink Small Outline Package) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited at floor life <=30C/85%RH) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC18F24J50-I/SS Pin Configuration
| Pin 1 | RA0/AN0/CVREF — Port A bit 0 / ADC channel 0 / comparator voltage reference output |
| Pin 2 | RA1/AN1 — Port A bit 1 / ADC channel 1 |
| Pin 3 | RA2/AN2/VREF- — Port A bit 2 / ADC channel 2 / ADC Vref- |
| Pin 4 | RA3/AN3/VREF+ — Port A bit 3 / ADC channel 3 / ADC Vref+ |
| Pin 5 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input |
| Pin 6 | RA5/AN4 — Port A bit 5 / ADC channel 4 |
| Pin 7 | RA6 — Port A bit 6 |
| Pin 8 | RA7 — Port A bit 7 |
| Pin 9 | Vss — Ground reference |
| Pin 10 | VDD — Positive supply voltage (3.3V typical) |
| Pin 11 | RB0/AN12/INT0 — Port B bit 0 / ADC channel 12 / external interrupt 0 |
| Pin 12 | RB1/AN10/INT1 — Port B bit 1 / ADC channel 10 / external interrupt 1 |
| Pin 13 | RB2/AN8 — Port B bit 2 / ADC channel 8 |
| Pin 14 | RB3/AN9 — Port B bit 3 / ADC channel 9 |
| Pin 15 | RB4/AN11 — Port B bit 4 / ADC channel 11 |
| Pin 16 | RB5/CCP5 — Port B bit 5 / CCP5 module |
| Pin 17 | RB6/PGC — Port B bit 6 / ICSP clock input |
| Pin 18 | RB7/PGD — Port B bit 7 / ICSP data input/output |
| Pin 19 | VUSB — USB transceiver 3.3V supply (must be decoupled with 4.7uF + 0.1uF) |
| Pin 20 | D+ — USB D+ data line (27 ohm series resistor to connector) |
| Pin 21 | D- — USB D- data line (27 ohm series resistor to connector) |
| Pin 22 | RC0 — Port C bit 0 |
| Pin 23 | RC1 — Port C bit 1 |
| Pin 24 | RC2 — Port C bit 2 |
| Pin 25 | RC6 — Port C bit 6 |
| Pin 26 | RC7 — Port C bit 7 |
| Pin 27 | RC4 — Port C bit 4 |
| Pin 28 | RC5 — Port C bit 5 |
Typical Applications
PIC18F24J50-I/SS is suitable for 6 applications: USB HID Peripherals (Keyboard/Mouse/Gamepad), USB-to-UART Serial Bridge, Battery-Powered Sensor Node with USB Diagnostics, USB Foot Pedal / Industrial Hand Switch, USB Programmer / Debug Probe Target Board, USB LED Lighting Controller (DMX-over-USB).
USB HID Peripherals (Keyboard/Mouse/Gamepad)
The PIC18F24J50-I/SS is engineered for USB Human Interface Device peripherals thanks to its integrated USB 2.0 full-speed transceiver, 1.5 KB endpoint RAM, and 16 KB Flash that comfortably hosts HID class drivers. At 48 MHz the part delivers 12 MIPS, enough to debounce a 104-key mechanical keyboard matrix at 1 kHz polling rate. The on-chip 10-bit ADC scans analog joysticks or trigger potentiometers in the same scan loop. Deep-sleep at 100 nA extends battery life on wireless HID dongles.
Recommended
USB-to-UART Serial Bridge
Use the PIC18F24J50-I/SS as a USB CDC bridge to expose a virtual COM port over USB, eliminating external UART-USB ICs such as FTDI chips. The 48 MHz CPU, 3.8 KB RAM, and full-speed USB handle 921600 baud transparently. The 25 I/O pins allow breakout of TX/RTS/CTS handshaking alongside status LEDs. With nanoWatt XLP at 100 nA idle, the bridge draws negligible current when the host is suspended.
Recommended
Battery-Powered Sensor Node with USB Diagnostics
The PIC18F24J50-I/SS powers battery-operated sensor nodes with intermittent USB diagnostics, leveraging nanoWalt XLP deep-sleep at 20 nA and 2.0-3.6V core Vdd to run directly from a CR2032 or 2x AA alkaline stack. Wake from sleep via WDT or external interrupt, sample with the 10-bit ADC at 13-channel resolution, then enumerate as a USB CDC device only when a service cable is attached. The integrated USB transceiver saves the $0.50-$1 cost of an external PHY chip.
Recommended
USB Foot Pedal / Industrial Hand Switch
Pair the PIC18F24J50-I/SS with mechanical foot switches or hand triggers in industrial automation, where the integrated USB-HID stack reports keystrokes without custom PC drivers. The 28-SSOP package fits inside an IP65 sealed enclosure; the 5V-tolerant I/O accept industrial 24V signals via external resistor dividers. The 16 KB Flash hosts the HID stack plus application-specific debounce and press-and-hold logic with room to spare for factory-test routines.
Recommended
USB Programmer / Debug Probe Target Board
OEMs building USB programmers and debug probes use the PIC18F24J50-I/SS as the target MCU on development boards, where its 28-SSOP footprint is easy to hand-solder and its 16 KB Flash is large enough for bootloader + application demos. ICSP via PGD/PGC pins supports in-circuit programming without removing the part. The 48 MHz operation demonstrates the practical limits of an 8-bit USB stack with CDC, HID, and vendor-class endpoints coexisting.
Recommended
USB LED Lighting Controller (DMX-over-USB)
Stage lighting designers adopt the PIC18F24J50-I/SS for DMX-over-USB dongles where the integrated USB full-speed and 48 MHz clock drive a DMX512 transmitter via software bit-banging or via the ECCP module. The 10-bit ADC can sample ambient light for auto-dimming, while nanoWalt XLP keeps standby current below 100 nA when the host PC is off. The 28-SSOP footprint allows the dongle to fit inside an XLR-connector shell.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F24J50-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F25J50-I/SS | PIC18F26J50-I/SS | PIC18LF24J50-I/SS | PIC18F24J50T-I/SS | PIC18F24J10-I/SS |
|---|---|---|---|---|---|---|
| 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 |
| Program Flash | 16 KB | 32 KB | 64 KB | 16 KB | 16 KB | 16 KB |
| Data RAM | 3.8 KB | 3.8 KB | 3.8 KB | 3.8 KB | 3.8 KB | 3.8 KB |
| USB 2.0 Full-Speed | Yes (integrated) | Yes (integrated) | Yes (integrated) | Yes (integrated) | Yes (integrated) | No (USB absent) |
| Maximum CPU Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Core Voltage | 2.0V to 3.6V | 2.0V to 3.6V | 2.0V to 3.6V | 2.0V to 3.6V (LF process, lower Iq) | 2.0V to 3.6V | 2.0V to 3.6V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Integrated USB 2.0 Full-Speed transceiver with 1.5 KB endpoint RAM (vs PIC18F24J10-I/SS)
- 16 KB Flash is smallest in PIC18F2xJ50 family but offers lowest unit cost (vs PIC18F26J50-I/SS)
- Industrial -40C to +85C operating range with nanoWatt XLP deep-sleep (vs PIC18F4550-I/P (40-pin DIP, 5V native))
Design Notes
Place a 4.7uF tantalum or ceramic capacitor plus a 0.1uF decoupling cap directly at the Vdd/Vss pair (pins 10/9). The VUSB pin (pin 19) requires its own 4.7uF plus 0.1uF network to stabilize the internal USB 3.3V regulator. Without these local caps, the USB transceiver may fail USB compliance tests for inrush current and droop.
Enable the internal 3.3V regulator in CONFIG3L (ENVREG = 1) before the part will start. With the regulator disabled, the device sits in reset indefinitely because the USB transceiver and digital core have no rail. Also remember that VDDIO and VDD share the same 3.3V rail on the 28-pin device; there is no separate 5V-tolerant rail to bias.
Route the USB D+ and D- traces as a 90-ohm differential pair with matched length to within 50 mils. Keep the 27-ohm series resistors within 5 mm of the MCU pins. Add a 15 kohm pull-down on D- and a 1.5 kohm pull-up on D+ (software-controlled via the USB module) so the device enumerates correctly in USB Full-Speed mode.
When migrating from PIC18F4550 designs, note that the PIC18F24J50 lacks a separate Vbus pin and uses VUSB instead. USB bus-powered designs must add a 470uF bulk capacitor at the upstream VBUS node per USB 2.0 spec section 7.1.5.1, plus a current-limiting circuit because the 24J50 cannot source 100 mA directly to the bus.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified (consumer/industrial grade, not automotive). Lead-free SSOP package is MSL-1 rated. Conflict-minerals declaration available from Microchip.
