PIC18F24J50T-I/ML - 8-bit USB MCU 16KB Flash 48MHz QFN-28
MPN: PIC18F24J50T-I/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.96 | $2.96 |
| 10 | $2.66 | $26.60 |
| 100 | $2.39 | $239.00 |
| 500 | $2.12 | $1,060.00 |
| 1,000 | $1.88 | $1,880.00 |
PIC18F24J50T-I/ML Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, peripherals, and I/O. 8-bit MCUs like the PIC18F24J50T-I/ML are widely used in cost-sensitive embedded designs where deterministic performance, low power consumption, and simple toolchain integration are priorities. The PIC18F24J50 belongs to the PIC18 J-series family, which combines a RISC Harvard-architecture CPU with nanoWatt XLP power management, fitting into the broader taxonomy: MCU -> microcontroller -> embedded processor -> semiconductor.
Key features include a maximum CPU clock of 48 MHz (12 MIPS), 25 programmable digital I/O pins, hardware USB 2.0 full-speed (12 Mbps) transceiver with on-chip transimpedance amplifier, two USART/UART modules, two SPI/I2C MSSP peripherals, 10-channel 10-bit ADC, and Deep Sleep mode for nanoWatt XLP standby. Operating voltage is 2.0 V to 3.6 V (typical 3.3 V) per the J-series datasheet. The QFN-28 EP package measures 6 x 6 mm and provides a low thermal resistance path through the exposed pad.
The PIC18F24J50T-I/ML is built on an enhanced PIC18 Harvard RISC core with 16-bit instructions and 8-bit data path, supporting linear addressing up to 2 MB. Internal peripherals are mapped via SFRs and configurable for DMA-style operation with interrupt-driven context. The integrated USB SIE eliminates the need for an external PHY, simplifying USB device designs.
Typical applications include USB HID/mouse/keyboard peripherals, USB-to-UART bridges, USB sensors and data loggers, low-power IoT nodes, consumer electronics, and industrial control with USB diagnostics. Designers select this part when they need USB connectivity in a small QFN footprint with low power budgets.
When designing with this part, ensure the exposed pad (EP) is soldered to a sufficiently large copper pour to meet thermal and electrical ground requirements; an unsoldered EP raises junction temperature and degrades ADC accuracy. Place the USB DP/DN traces as a 90-ohm differential pair per USB 2.0 specification.
Drop-in alternatives for PIC18F24J50T-I/ML — 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 PIC18F24J50T-I/ML (same form factor and footprint) — differing in ADC, I/O Pins, MSL Level, Timers, EEPROM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F24J50-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F25J50-I/ML
✅ Drop-In✓ In Stock
$3.04 / Unit
View Datasheet →PIC18F24J11-I/ML
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F2450-I/ML
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.65 / Unit
View Datasheet →PIC18F24J50T-I/ML Maximum Ratings & Electrical Characteristics
| Program Memory Size | 16 KB Flash |
| RAM Size | 3.8 KB |
| CPU Core | PIC18 (8-bit RISC, Harvard) |
| Maximum Clock Frequency | 48 MHz |
| Performance | 12 MIPS |
| Operating Voltage Range | 2.0 V to 3.6 V |
| I/O Pins | 25 programmable |
| USB Interface | USB 2.0 Full-Speed (12 Mbps) with on-chip transceiver |
| ADC | 10-bit, 10 channels |
| Timers | 4 (Timer0/1/2/3) plus ECCP |
| Communication Peripherals | 2x UART, 2x SPI, 2x I2C (MSSP) |
| Package Type | QFN-28 (VQFN-28 EP), 6 x 6 mm |
| Operating Temperature | -40C to +85C (industrial grade) |
| Mounting Type | Surface Mount |
| MSL Level | 3 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Series | PIC18 J-series, PIC18F24J50 family |
| Power-Saving Modes | Deep Sleep (nanoWatt XLP), Sleep, Idle, Doze |
| Programming/Debug | ICSP via PGx/PGDx, ICD support |
PIC18F24J50T-I/ML 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 — Digital I/O / Analog input channel 2 |
| Pin 4 | RA3/AN3 — Digital I/O / Analog input channel 3 |
| Pin 5 | RA4 — Digital I/O (open-drain capable) |
| Pin 6 | RA5/AN4 — Digital I/O / Analog input channel 4 |
| Pin 7 | VDD — Positive supply voltage (2.0V-3.6V) |
| Pin 8 | VSS — Ground reference |
| Pin 9 | RA7 — Digital I/O / OSC1 alternate |
| Pin 10 | RA6 — Digital I/O / OSC2 alternate |
| Pin 11 | OSC1/CLKI — Crystal oscillator input / external clock |
| Pin 12 | OSC2/CLKO — Crystal oscillator output / clock out |
| Pin 13 | RC0 — Digital I/O |
| Pin 14 | RC1 — Digital I/O |
| Pin 15 | RC2 — Digital I/O |
| Pin 16 | VUSB3V3 — Internal USB transceiver 3.3V regulator output (decouple with 220nF) |
| Pin 17 | RC4 — Digital I/O / USB D- (alternate) |
| Pin 18 | RC5 — Digital I/O / USB D+ (alternate) |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage (2.0V-3.6V) |
| Pin 21 | RB0/AN12 — Digital I/O / Analog input channel 12 |
| Pin 22 | RB1/AN10 — Digital I/O / Analog input channel 10 |
| Pin 23 | RB2/AN8 — Digital I/O / Analog input channel 8 |
| Pin 24 | RB3/AN9 — Digital I/O / Analog input channel 9 |
| Pin 25 | RB4 — Digital I/O |
| Pin 26 | RB5 — Digital I/O |
| Pin 27 | RB6/PGC — Digital I/O / ICSP clock |
| Pin 28 | RB7/PGD — Digital I/O / ICSP data |
Typical Applications
PIC18F24J50T-I/ML is suitable for 6 applications: USB HID Peripherals (Mouse, Keyboard, Custom HID), USB-to-UART Bridge / CDC Virtual COM Port, USB Data Loggers and Sensors, Low-Power IoT Nodes with USB Diagnostics, Consumer Electronics with USB Charging/Status, Industrial Control with USB Diagnostics Port.
USB HID Peripherals (Mouse, Keyboard, Custom HID)
The PIC18F24J50T-I/ML is well-suited for USB HID devices such as mice, keyboards, game controllers, and custom HID peripherals because it integrates a USB 2.0 full-speed transceiver and SIE directly on-chip, eliminating external PHY components. Its 48 MHz system clock precisely derives the 12 Mbps USB bit rate, while 16 KB Flash supports full HID descriptor and report handling plus a USB HID bootloader. The 25 available I/O pins connect directly to switches, encoders, sensors, and LED indicators. Compared to discrete USB solutions, this part reduces BOM by ~$0.50 and PCB area by 50%. Designers can use the Microchip USB Framework or MCHPUSB stack for rapid HID development.
Recommended
USB-to-UART Bridge / CDC Virtual COM Port
The PIC18F24J50T-I/ML functions as a USB-to-UART bridge implementing the CDC (Communications Device Class) class driver to appear as a virtual COM port on a host PC. Its integrated USB SIE handles enumeration and bulk transfers while the hardware UART module drives RS-232/RS-485 transceivers externally. The 48 MHz clock and 16 KB Flash are sufficient for full CDC-ACM stack plus bootloader. At 3.3 V operation, the part pairs directly with low-voltage transceivers such as the MAX3232 or SP3232. This application is common in industrial debug ports, firmware update channels, and legacy equipment modernization where USB replaces RS-232.
Recommended
USB Data Loggers and Sensors
The PIC18F24J50T-I/ML serves as the controller in USB-attached data loggers and sensors, streaming readings via USB bulk or interrupt endpoints to a host PC. Its 10-channel 10-bit ADC samples up to 8 analog sensors (temperature, pressure, voltage, current) while the USB interface provides both power and high-speed data transfer. The 3.8 KB RAM buffers multi-channel acquisition, and the 16 KB Flash holds the USB stack plus acquisition logic. NanoWatt XLP Deep Sleep mode reduces idle current below 100 nA, enabling battery-powered USB sensors that wake on demand. Compared to external ADC + USB MCU solutions, this part integrates both functions on one die.
Recommended
Low-Power IoT Nodes with USB Diagnostics
The PIC18F24J50T-I/ML fits battery-powered IoT nodes that include a USB port for firmware updates, configuration, and diagnostics. NanoWatt XLP Deep Sleep mode draws less than 100 nA, enabling multi-year battery life on coin cells when most activity is sleep, while the USB port provides instant wake and high-speed data transfer during service windows. The 3.3 V native supply matches Li-Ion or 2xAA battery chemistries without LDO losses. The integrated USB SIE avoids the BOM cost of an external PHY or FTDI chip, which is critical at $2-3 BOM targets. Common implementations include wireless sensor base stations, BLE gateway controllers, and field-tunable instrumentation.
Recommended
Consumer Electronics with USB Charging/Status
The PIC18F24J50T-I/ML provides cost-effective USB interfacing in consumer products such as toys, gaming accessories, personal care devices, and smart home peripherals. Its small 6x6 mm QFN-28 footprint fits inside compact enclosures, while the integrated USB handles battery charging status (BC 1.2), firmware updates, and host PC connectivity. The 25 I/O pins drive LEDs, motor PWM (via ECCP), buttons, and displays, replacing multiple discrete components. Industrial temperature grade (-40C to +85C) ensures operation across consumer product environmental requirements. The PIC18 J-series stability and long product lifecycle support 5-10 year consumer product programs.
Recommended
Industrial Control with USB Diagnostics Port
The PIC18F24J50T-I/ML is well-suited to industrial controllers, sensors, and HMIs that need a USB diagnostics/commissioning port. Industrial users can connect a laptop via USB to read parameters, upload firmware, dump logs, and configure settings without opening the enclosure. The 25 I/O pins drive industrial peripherals (relays, optocouplers, 4-20 mA loops, encoder inputs), while the 10-bit ADC reads sensor signals. Industrial temperature grade and robust QFN packaging survive factory floor environments. The USB port enables compliance with Industry 4.0 service and diagnostics requirements that demand digital access.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F24J50T-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F24J50-I/ML | PIC18F25J50-I/ML | PIC18F24J11-I/ML | PIC18F2450-I/ML |
|---|---|---|---|---|---|
| Package | QFN-28 (VQFN-28 EP) 6x6 mm | QFN-28 (VQFN-28 EP) 6x6 mm - same | QFN-28 (VQFN-28 EP) 6x6 mm - same | QFN-28 (VQFN-28 EP) 6x6 mm - same | QFN-28 (VQFN-28 EP) 6x6 mm - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Flash Memory | 16 KB | 16 KB (same die) | 32 KB (+100%) | 16 KB (same) | 16 KB (same) |
| RAM | 3.8 KB | 3.8 KB (same) | 3.8 KB (same) | 3.8 KB (same) | 768 B (-80%) |
| Maximum CPU Clock | 48 MHz (12 MIPS) | 48 MHz (same) | 48 MHz (same) | 48 MHz (same) | 48 MHz (same) |
| USB Interface | USB 2.0 Full-Speed integrated SIE | USB 2.0 Full-Speed integrated (same) | USB 2.0 Full-Speed integrated (same) | No USB (external PHY required) | USB 2.0 Full-Speed integrated (same) |
| I/O Pins | 25 | 25 (same) | 25 (same) | 25 (same) | 23 (-2) |
| Operating Voltage | 2.0 V to 3.6 V | 2.0 V to 3.6 V (same) | 2.0 V to 3.6 V (same) | 2.0 V to 3.6 V (same) | 2.0 V to 5.5 V (wider) |
| ADC | 10-bit, 10 channels | 10-bit, 10 channels (same) | 10-bit, 10 channels (same) | 10-bit, 10 channels (same) | 10-bit, 8 channels (-2) |
| Packaging Form | Tape & Reel ('T' suffix) | Tube/Tray (no 'T') | Tube/Tray (no 'T') | Tube/Tray (no 'T') | Tube/Tray (no 'T') |
Key Differentiators
- Doubled Flash for future-proofing USB stack + bootloader (vs PIC18F25J50-I/ML)
- Industrial temperature grade in compact QFN-28 (vs PIC18F24J50-I/ML)
- Integrated USB 2.0 SIE removes external PHY (vs PIC18F24J11-I/ML)
Design Notes
Solder the QFN-28 exposed pad (EP) to a continuous copper ground pour of at least 25 mm x 25 mm on the top or bottom layer with thermal vias to inner planes. An unsoldered EP raises junction-to-ambient thermal resistance to >80 C/W and degrades ADC accuracy by 1-2 LSB at full USB throughput. Reference Microchip AN1267 'QFN Package Mounting Guidelines' for stencil/via patterns.
Route the USB DP/DN signals (RC4/RC5 in USB mode) as a 90-ohm differential pair with continuous ground reference beneath. Keep trace lengths matched within 150 mil (3.8 mm) and avoid sharp 90-degree bends. Place the 15 kohm pull-down on D- and 1.5 kohm pull-up on D+ only when the part is configured for full-speed device mode; remove them for bus-powered designs.
Do not power VDD at 5 V; the PIC18F24J50T-I/ML is NOT 5V-tolerant on I/O. Use a 3.3 V LDO or DC-DC converter from any 5 V source, and add a 100 nF + 4.7 uF ceramic bulk capacitor near the VDD pins (7 and 20). Failing to bypass both VDD pins causes brown-outs during USB enumeration. Also note that VUSB3V3 (pin 16) requires a 220 nF decoupling capacitor to VSS per the datasheet; omitting this prevents USB transceiver startup.
Estimate: at 48 MHz CPU clock and active USB, the PIC18F24J50T-I/ML draws approximately 12-15 mA from VDD. Add 4.7 uF bulk + 100 nF ceramic at each VDD pin. To enable nanoWatt XLP Deep Sleep mode (<100 nA), set all peripherals to off, disable the system clock, and use INT0/RB0 wake-up. This can extend battery life from months to years in duty-cycled sensor applications.
Compliance Information
RoHS and REACH compliant per Microchip product page. Industrial temperature grade -40C to +85C. AEC-Q100 not applicable (consumer/industrial MCU, not automotive qualified). Halogen-free status not explicitly stated in provided data.
