PIC18F44J50-I/PT - 48MHz USB 8-bit MCU 16KB Flash TQFP-44
MPN: PIC18F44J50-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.5 | $4.50 |
| 10 | $4.05 | $40.50 |
| 100 | $3.6 | $360.00 |
| 500 | $3.2 | $1,600.00 |
| 1,000 | $2.85 | $2,850.00 |
| 3,000 | $2.55 | $7,650.00 |
PIC18F44J50-I/PT Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals. The PIC18 family uses an enhanced RISC architecture with 16-bit instructions and 8-bit data paths. USB microcontrollers add a built-in USB transceiver and Serial Interface Engine (SIE), eliminating the need for an external USB interface chip. The PIC18 J-series targets low-power, USB-enabled embedded designs.
Key features include 36 digital I/O pins, 13 10-bit ADC channels, two analog comparators, two USART, SPI, I2C peripherals, and a 64 MHz internal oscillator with PLL. The nanoWatt XLP technology provides deep sleep mode (as low as 100 nA typical) and multiple low-power run/Idle modes for battery-powered applications. The integrated USB 2.0 full-speed transceiver supports device, host, and OTG operation through the on-chip SIE.
The PIC18F44J50-I/PT uses a Harvard architecture with separate program Flash and data SRAM buses, allowing simultaneous instruction fetch and data access. Its 16 KB self-programmable Flash supports ICSP (In-Circuit Serial Programming), enabling field firmware updates. The device operates over the industrial -40C to +85C temperature range and is RoHS compliant, suitable for industrial, consumer, and medical device designs requiring USB connectivity with minimal BOM.
Typical applications include USB-to-UART bridges, HID peripherals (keyboards, mice, game controllers), medical instrumentation with USB data logging, USB-based sensor nodes, and low-power IoT endpoints. The 48 MHz clock rate and integrated USB transceiver simplify USB stack implementation while the small TQFP-44 footprint minimizes PCB area.
When designing with this part, ensure the 3.3V core supply decoupling includes a 100 nF ceramic capacitor near each VDD/VSS pin pair and a bulk 4.7 uF capacitor on the core rail. The USB D+/D- lines require 27-ohm series resistors and a 1.5 kohm pull-up on D+ for full-speed device operation. The integrated USB voltage regulator provides 3.3V from the VBUS pin when powered from USB.
This page synthesizes Microchip datasheet specifications, distributor pricing (LCSC from $1.4633 as of 2026-09-27), same-family drop-in alternatives, and practical PCB design guidance not consolidated on distributor product pages.
Drop-in alternatives for PIC18F44J50-I/PT — 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 PIC18F44J50-I/PT (same form factor and footprint) — differing in Package, Timers, Operating Temperature, ADC, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F46J50-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F44J11-I/ML
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC18F4450-I/P
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$6.05 / Unit
View Datasheet →PIC18F4455-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.85 / Unit
View Datasheet →PIC18F44K22-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4480-I/PT
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →PIC18F44J50-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 (8-bit RISC, enhanced) |
| Series | PIC18 J-series, nanoWatt XLP |
| Clock Speed (Maximum) | 48 MHz (12 MIPS) |
| Program Memory (Flash) | 16 KB (8K x 16) |
| Data RAM | 3.8 KB |
| USB Interface | USB 2.0 Full-Speed, integrated transceiver + SIE |
| USB Mode Support | Device / Host / OTG |
| Digital I/O Pins | 36 |
| ADC | 10-bit, 13 channels |
| Analog Comparators | 2 |
| USART | 2 |
| SPI | 1 (MSSP module) |
| I2C | 1 (MSSP module) |
| Timers | 4 (8-bit / 16-bit mix) |
| Supply Voltage (Core) | 2.15 V to 3.6 V |
| Supply Voltage (Analog/IO) | 4.2 V to 5.5 V |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | TQFP-44 (PT), 10x10 mm, 0.8 mm pitch |
| Mounting Type | Surface Mount |
| Pin Count | 44 |
| RoHS Status | Compliant |
| MSL Level | 3 (168 hours) |
| Lead-Free | Yes |
| Programming Method | ICSP (In-Circuit Serial Programming) |
| Internal Oscillator | Yes, 8 MHz with PLL to 48 MHz |
| Watchdog Timer | Yes |
PIC18F44J50-I/PT Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input, active low |
| Pin 2 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Pin 3 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Pin 4 | RA2/AN2/VREF- — Digital I/O / Analog input 2 / ADC VREF- |
| Pin 5 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC VREF+ |
| Pin 6 | RA4/AN4 — Digital I/O / Analog input 4 |
| Pin 7 | RA5/AN5 — Digital I/O / Analog input 5 |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKIN — Crystal oscillator input / external clock |
| Pin 10 | OSC2/CLKOUT — Crystal oscillator output |
| Pin 11 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output |
| Pin 12 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator in / CCP2 |
| Pin 13 | RC2/CCP1 — Digital I/O / CCP1 PWM output |
| Pin 14 | RC3 — Digital I/O |
| Pin 15 | RC4/D-/VM — Digital I/O / USB D- / external USB monitor |
| Pin 16 | RC5/D+/VP — Digital I/O / USB D+ / external USB monitor |
| Pin 17 | RC6/TX1/CK1 — Digital I/O / USART1 TX / clock |
| Pin 18 | RC7/RX1/DT1 — Digital I/O / USART1 RX / data |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply for I/O and analog |
| 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/AN11 — Digital I/O / Analog input channel 11 |
| Pin 26 | RB5/AN7 — Digital I/O / Analog input channel 7 |
| Pin 27 | RB6/PGC — Digital I/O / ICSP clock |
| Pin 28 | RB7/PGD — Digital I/O / ICSP data |
| Pin 29 | VUSB — Internal USB 3.3V regulator output |
| Pin 30 | VDD — Positive supply |
| Pin 31 | VSS — Ground reference |
| Pin 32 | RD0 — Digital I/O port D |
| Pin 33 | RD1 — Digital I/O port D |
| Pin 34 | RD2 — Digital I/O port D |
| Pin 35 | RD3 — Digital I/O port D |
| Pin 36 | RD4 — Digital I/O port D |
| Pin 37 | RD5 — Digital I/O port D |
| Pin 38 | RD6 — Digital I/O port D |
| Pin 39 | RD7 — Digital I/O port D |
| Pin 40 | VSS — Ground reference |
| Pin 41 | VDD — Positive supply |
| Pin 42 | RE0 — Digital I/O port E |
| Pin 43 | RE1 — Digital I/O port E |
| Pin 44 | RE2 — Digital I/O port E |
Typical Applications
PIC18F44J50-I/PT is suitable for 6 applications: USB HID Peripheral (Keyboard/Mouse/Gamepad), USB-to-UART Bridge Adapter, Medical USB Data Logger, USB Sensor Node (Industrial IoT), USB Barcode / RFID Reader, USB Audio Class Device (Speaker/Microphone).
USB HID Peripheral (Keyboard/Mouse/Gamepad)
The PIC18F44J50-I/PT is well suited to USB HID peripherals because its integrated full-speed USB transceiver and SIE implement the HID class without an external interface chip. The 48 MHz clock supports the 1 ms HID polling interval with ample margin for button debouncing and LED control. Pair the MCU with low-side MOSFETs for keyboard matrix scanning; the 36 I/O pins handle 6x6 matrices with room for caps-lock and backlight PWM channels. Battery-powered designs benefit from the nanoWatt XLP deep-sleep mode (under 100 nA typical) for cordless mice that spend most of their life idle.
Recommended
USB-to-UART Bridge Adapter
For USB-to-UART bridge adapters the PIC18F44J50-I/PT integrates both USB device functionality and two USART modules, eliminating the need for a separate bridge IC like FTDI FT232R. The integrated USB voltage regulator provides 3.3 V from VBUS, so only an external 12 MHz crystal and decoupling caps are required. With 3.8 KB RAM, it can buffer UART traffic for either baud rate while maintaining USB 2.0 full-speed throughput (12 Mbps). The industrial -40C to +85C grade supports industrial serial-port replacement designs.
Recommended
Medical USB Data Logger
The PIC18F44J50-I/PT fits portable medical data loggers that stream samples to a PC over USB. Its 13-channel 10-bit ADC captures temperature, battery voltage, and sensor signals with 4 mV LSB at 3.3 V reference. The 16 KB Flash holds lightweight USB class drivers and basic DSP routines, while 3.8 KB RAM buffers sample packets between USB transfers. The 2.15 V minimum core supply enables operation from a single Li-Ion cell without a boost converter, reducing BOM cost and PCB area in patient wearables.
Recommended
USB Sensor Node (Industrial IoT)
USB-powered industrial sensor nodes leverage the PIC18F44J50-I/PT to read multiple analog sensors and present them to a host over USB. The on-chip 10-bit ADC handles 13 sensor channels while the integrated USB negotiates with the host for bus power. The nanoWatt XLP idle mode drops consumption below 1 uA during USB suspend, satisfying USB 2.0 suspend current requirements without external load switches. The TQFP-44 footprint keeps the PCB small enough to embed inside a sensor housing.
Recommended
USB Barcode / RFID Reader
USB barcode scanners and RFID readers use the PIC18F44J50-I/PT to capture scan data and present it via USB HID or CDC class. The 48 MHz clock reads sensor output and decodes barcode patterns in real time, while the integrated USB transceiver streams decoded data to the host as keyboard input. The 36 I/O pins drive LCD status displays, LED indicators, and the trigger button. The -40C to +85C industrial temperature range supports warehouse and outdoor scanning environments.
Recommended
USB Audio Class Device (Speaker/Microphone)
The PIC18F44J50-I/PT can implement USB audio class 1.0 devices (speakers, microphones, headsets) using the integrated USB 2.0 full-speed link. The 48 MHz instruction rate handles USB isochronous transfers at the 1 ms polling interval while PWM outputs drive a class-D amplifier stage. The 16 KB Flash holds the USB audio class driver and a small audio buffer; for higher sample rates the PIC18F46J50-I/PT sibling provides more headroom. The compact TQFP-44 package fits inside wearable audio accessory enclosures.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F44J50-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F46J50-I/PT | PIC18F44J11-I/ML | PIC18F4450-I/P | PIC18F4455-I/PT | PIC18F44K22-I/PT | PIC18F4480-I/PT |
|---|---|---|---|---|---|---|---|
| Package | TQFP-44 (PT) | TQFP-44 (PT) - same | TQFP-44 (ML) - same | TQFP-44 (P) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB | 64 KB (+300%) | 16 KB (same) | 16 KB (same) | 24 KB (+50%) | 16 KB (same) | 16 KB (same) |
| RAM | 3.8 KB | 3.8 KB (same) | 3.8 KB (same) | 2 KB (-47%) | 2 KB (-47%) | 1.5 KB (-60%) | 768 B (-80%) |
| Integrated USB | Yes (Full-Speed, OTG) | Yes (Full-Speed, OTG) | No | Yes (Full-Speed) | Yes (Full-Speed) | No | No (CAN instead) |
| Clock Speed | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 64 MHz | 40 MHz |
| Operating Voltage | 2.15 V to 3.6 V | 2.15 V to 3.6 V | 2.15 V to 3.6 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 1.8 V to 3.6 V | 4.2 V to 5.5 V |
| nanoWatt XLP | Yes | Yes | Yes | No | No | Yes | No |
| Approx. Unit Price | $1.46 (LCSC) | $2.10 | $1.30 | $2.40 | $2.50 | $1.50 | $2.30 |
Key Differentiators
- Larger Flash without changing footprint (vs PIC18F44K22-I/PT)
- Lower voltage operation with same USB feature set (vs PIC18F4450-I/P)
- Drop-in upgrade path for larger firmware (vs PIC18F46J50-I/PT)
Design Notes
Place a 100 nF ceramic decoupling capacitor on every VDD/VSS pin pair (4 pairs on TQFP-44) and a single 4.7 uF bulk capacitor on the main VDD rail within 10 mm of the MCU. The PIC18F44J50 has both an internal USB voltage regulator (VUSB pin) and the core supply; tie VUSB to VDD via 220 nF when USB is unused, or to the USB VBUS-derived 3.3 V when USB is used. The deep-sleep current of nanoWatt XLP is achieved only when the on-chip regulator is disabled and the ADC is powered down.
Route USB D+ and D- as a matched 90-ohm differential pair from pins 15-16 to the USB connector, with maximum trace length of 25 mm. Place the 15 kohm pull-up resistor on D+ as close to the MCU pin as possible to ensure proper full-speed signaling. Add a 0.1 uF bypass cap on the VBUS pin if the device draws bus power. The internal USB regulator (VUSB pin 29) needs a 220 nF to 470 nF ceramic capacitor for stability.
Do not exceed the 3.6 V absolute maximum on the digital VDD supply or the USB D+/D- pins will forward-conduct into the internal ESD diodes and load the USB bus. The analog VDD rail (VDD on pins 20, 30, 41) tolerates 4.2-5.5 V; never tie both analog and digital VDDs to 5 V simultaneously. Watch for the MCLR pin (pin 1) - if left floating, the device may reset intermittently; tie to VDD via a 10 kohm resistor. ICSP programming requires the PGC/PGD pins (RB6/RB7) to not be pulled low during reset.
TQFP-44 has 0.8 mm pitch leads; use a PCB footprint with 0.4 mm pad width and 1.5 mm pad length to ensure reliable solder joints. Place the MCU near the edge of the board if USB is used, with the USB connector within 25 mm of the D+/D- pins. Ground plane on the top layer under the MCU improves thermal dissipation but keep the area under the crystal pins (9-10) clear of ground plane pour to reduce capacitive loading that shifts the oscillation frequency.
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature grade -40C to +85C. Not AEC-Q100 qualified; not designed for automotive use. For automotive-grade PIC18F44J50, check Microchip's automotive part number suffix -I/PTAEC1 or similar.
