PIC18F45J50T-I/PT - 48MHz USB 8-bit MCU 32KB Flash | Microchip
MPN: PIC18F45J50T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.36 | $336.00 |
| 500 | $3.02 | $1,510.00 |
| 1,000 | $2.69 | $2,690.00 |
PIC18F45J50T-I/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, RAM, and peripheral interfaces into one package. In the broader hierarchy, this part is a member of the 8-bit microcontroller class, which sits below 32-bit ARM Cortex-M devices but above simple logic ICs in computational capability. 8-bit MCUs remain preferred for cost-sensitive, low-power, and USB-connected embedded designs where the silicon area and BOM cost of a 32-bit part are not required.
Key features of the PIC18F45J50T-I/PT include deep-sleep nanoWatt XLP technology drawing sub-1uA quiescent current, peripheral pin select (PPS) for flexible I/O mapping, 36 digital I/O pins, an integrated USB 2.0 full-speed transceiver with on-chip voltage regulator, and 256 bytes of EEPROM data memory. The 32KB self-programmable Flash supports in-application programming via USB or ICSP, eliminating external bootloaders.
The device uses a modified Harvard RISC architecture with a 16-bit instruction word and 8-bit data path, executed from a single-cycle pipeline. The CTMU allows touch buttons, sliders, and proximity sensing with no external components beyond the sensor electrodes, and the integrated USB PHY eliminates the need for external transceivers, making the part attractive for HID peripherals, instrumentation, and industrial control nodes.
Typical applications include USB HID devices such as keyboards and mice, USB-to-UART bridges, capacitive touch user interfaces, low-power sensor nodes, and small industrial control boards. The wide operating range and robust peripheral set also suit portable medical accessories, point-of-sale terminals, and educational platforms.
When designing with this part, ensure the USB D+/D- traces are routed as a 90-ohm differential pair and that VUSB decoupling complies with the USB 2.0 specification. The internal voltage regulator requires a single bulk capacitor on VDD; consult the datasheet for the exact capacitance value.
This page synthesizes distributor pricing, drop-in alternative MPNs, and practical design notes not found in the manufacturer datasheet, providing engineers a faster path from selection to prototype.
Drop-in alternatives for PIC18F45J50T-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 PIC18F45J50T-I/PT (same form factor and footprint) — differing in ADC, Operating Temperature, Package, USB, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F44J50T-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.55 / Unit
View Datasheet →PIC18F46J50T-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.42 / Unit
View Datasheet →PIC18F45J50-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F47J53T-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.3 / Unit
View Datasheet →PIC18F4550T-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F45J50T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC18 enhanced Harvard RISC |
| Series | PIC XLP 18J |
| Instruction Set | 16-bit instruction word, 8-bit data path |
| Maximum Clock Speed | 48 MHz |
| Performance | 10 MIPS |
| Program Memory (Flash) | 32 KB (16K x 16) |
| RAM | 4 KB |
| EEPROM | 256 bytes |
| Supply Voltage (VDD) | 2.0 V to 3.6 V |
| I/O Pins | 36 |
| USB Interface | USB 2.0 Full-Speed (12 Mbps), on-chip transceiver |
| ADC | 12-bit, up to 13 channels |
| Analog Comparators | 2 |
| UART | 2 |
| SPI | 2 |
| I2C | 2 (MSSP) |
| Timers | 5 (8/16-bit) |
| PWM Channels | 5 (ECCP + CCP) |
| CTMU | Yes (capacitive touch) |
| Peripheral Pin Select (PPS) | Yes |
| Package | 44-pin TQFP (PT) 10x10 mm |
| Operating Temperature | -40C to +85C (Industrial) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC18F45J50T-I/PT Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input, drive low to reset |
| Pin 2 | RA0/AN0 — Port A bit 0 / analog input 0 / RP0 |
| Pin 3 | RA1/AN1 — Port A bit 1 / analog input 1 / RP1 |
| Pin 4 | RA2/AN2 — Port A bit 2 / analog input 2 / RP2 |
| Pin 5 | RA3/AN3 — Port A bit 3 / analog input 3 / VREF+ / RP3 |
| Pin 6 | RA4/AN4 — Port A bit 4 / analog input 4 / RP4 |
| Pin 7 | RA5/AN5 — Port A bit 5 / analog input 5 / RP5 |
| Pin 8 | RE0/P2D — Port E bit 0 / PWM2 output D |
| Pin 9 | RE1/P2C — Port E bit 1 / PWM2 output C |
| Pin 10 | RE2/P2B — Port E bit 2 / PWM2 output B |
| Pin 11 | VDD — Positive supply voltage (2.0-3.6V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKI/RA7 — External clock input / crystal oscillator input |
| Pin 14 | OSC2/CLKO/RA6 — Crystal oscillator output / clock output |
| Pin 15 | RC4/D+/RP11 — USB D+ data line / Port C bit 4 / RP11 |
| Pin 16 | RC5/D-/RP17 — USB D- data line / Port C bit 5 / RP17 |
| Pin 17 | RC6/TX1/CK1 — USART1 transmit / Port C bit 6 |
| Pin 18 | RC7/RX1/DT1 — USART1 receive / Port C bit 7 |
| Pin 19 | RD0/PSP0 — Port D bit 0 / parallel slave port bit 0 |
| Pin 20 | RD1/PSP1 — Port D bit 1 / parallel slave port bit 1 |
| Pin 21 | RD2/PSP2 — Port D bit 2 / parallel slave port bit 2 |
| Pin 22 | RD3/PSP3 — Port D bit 3 / parallel slave port bit 3 |
| Pin 23 | RC0/T1CKI — Timer1 clock input / Port C bit 0 |
| Pin 24 | RC1/SOSCI — Secondary oscillator input / Port C bit 1 |
| Pin 25 | RC2/SOSCO — Secondary oscillator output / Port C bit 2 |
| Pin 26 | RC3/SCL — I2C clock / Port C bit 3 |
| Pin 27 | RB0/INT0/FLT0 — External interrupt 0 / Port B bit 0 |
| Pin 28 | RB1/INT1 — External interrupt 1 / Port B bit 1 |
| Pin 29 | RB2/INT2 — External interrupt 2 / Port B bit 2 |
| Pin 30 | RB3/INT3 — External interrupt 3 / Port B bit 3 |
| Pin 31 | VSS — Ground reference (second bond pad) |
| Pin 32 | VDD — Positive supply voltage (second bond pad) |
| Pin 33 | RB4/KBI0 — Port B bit 4 / keyboard interrupt 0 |
| Pin 34 | RB5/KBI1 — Port B bit 5 / keyboard interrupt 1 |
| Pin 35 | RB6/KBI2/PGC — Port B bit 6 / ICSP clock / keyboard interrupt 2 |
| Pin 36 | RB7/KBI3/PGD — Port B bit 7 / ICSP data / keyboard interrupt 3 |
| Pin 37 | RD4/PSP4 — Port D bit 4 / parallel slave port bit 4 |
| Pin 38 | RD5/PSP5 — Port D bit 5 / parallel slave port bit 5 |
| Pin 39 | RD6/PSP6 — Port D bit 6 / parallel slave port bit 6 |
| Pin 40 | RD7/PSP7 — Port D bit 7 / parallel slave port bit 7 |
| Pin 41 | RE3/P3C — Port E bit 3 / PWM3 output C (input only) |
| Pin 42 | RE4/P3B — Port E bit 4 / PWM3 output B (input only) |
| Pin 43 | RE5/P1C — Port E bit 5 / PWM1 output C (input only) |
| Pin 44 | RE6/P1B — Port E bit 6 / PWM1 output B (input only) |
Typical Applications
PIC18F45J50T-I/PT is suitable for 6 applications: USB HID Keyboard and Mouse, USB-to-UART Bridge, Capacitive Touch User Interface, Industrial Sensor Node, Portable Medical Accessory, Educational Development Platform.
USB HID Keyboard and Mouse
The PIC18F45J50T-I/PT is purpose-built for USB HID peripherals such as keyboards, mice, and game controllers. Its integrated USB 2.0 full-speed PHY eliminates external transceiver cost, while 32 KB of Flash comfortably holds the HID class driver plus scan-matrix firmware. The CTMU module enables capacitive-touch keypads without external components, and the 48 MHz clock delivers 10 MIPS, enough headroom for 8 kHz USB polling plus debounced matrix scanning. Typical designs use 5 mA active and drop to under 1 uA in deep sleep, extending battery life on wireless HID dongles.
Recommended
USB-to-UART Bridge
The PIC18F45J50T-I/PT serves as a low-cost USB-to-UART bridge (CDC class device) for debugging, field-service consoles, and industrial gateways. The integrated USB PHY plus two hardware UARTs let one MCU handle both the USB CDC stack and one or two serial ports simultaneously. At 48 MHz, sustained 921600 baud throughput is achievable with negligible CPU load. The deep-sleep nanoWatt XLP mode lets the bridge idle under 1 uA when the host PC is suspended, meeting USB suspend-current requirements of 2.5 mA maximum with massive margin.
Recommended
Capacitive Touch User Interface
The PIC18F45J50T-I/PT on-chip CTMU module delivers capacitive touch sensing for buttons, sliders, and wheels without external charge-pump ICs. Combined with the Peripheral Pin Select (PPS) routing, capacitive electrodes can be placed on virtually any GPIO pin, simplifying PCB layout and reducing BOM cost. The 12-bit ADC quantizes touch capacitance changes with sufficient resolution for reliable proximity detection through 3 mm acrylic overlays. With 32 KB of Flash, designers can implement multi-zone touch panels plus USB reporting in a single chip.
Recommended
Industrial Sensor Node
The PIC18F45J50T-I/PT fits cost-sensitive industrial sensor nodes that periodically wake, sample analog sensors via the 12-bit ADC, and report over USB or UART. nanoWatt XLP deep sleep draws less than 100 nA, enabling multi-year battery life on duty-cycled measurements. The wide -40C to +85C industrial temperature range supports factory-floor deployment. With 36 GPIO and PPS, designers can map UART, SPI, and I2C sensors to any convenient pin, simplifying PCB routing in dense instrument enclosures.
Recommended
Portable Medical Accessory
The PIC18F45J50T-I/PT powers portable medical accessories such as USB-connected spirometers, pulse-oximeter dongles, and hearing-aid programmers. Its nanoWatt XLP technology meets IEC 60601-1-8 low-power alarm requirements, and the integrated USB PHY simplifies the medical-device EMC certification path by reducing radiated emissions from external clock sources. The 32 KB Flash holds the USB CDC stack plus clinical measurement algorithms, while 4 KB RAM buffers waveform samples between host reads.
Recommended
Educational Development Platform
The PIC18F45J50T-I/PT is widely used in university embedded-systems courses thanks to its integrated USB, free MPLAB X IDE support, and the XC8 compiler's generous optimization mode. The 44-TQFP package is breadboard-friendly via breakout boards, and the PIC18 instruction set is well documented in textbooks dating to the 1990s. Students learn USB enumeration, A/D conversion, PWM motor control, and I2C sensor integration on a single chip without needing external peripherals, accelerating time-to-first-project.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F45J50T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F44J50T-I/PT | PIC18F46J50T-I/PT | PIC18F47J53T-I/PT | PIC18F45J50T-I/ML | PIC18F45J50-I/PT | PIC18F4550T-I/PT |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-QFN (8x8 mm) - different | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same |
| Flash Memory | 32 KB | 16 KB (-50%) | 64 KB (+100%) | 128 KB (+300%) | 32 KB (identical) | 32 KB (identical) | 32 KB (identical) |
| RAM | 4 KB | 4 KB (identical) | 4 KB (identical) | 4 KB (identical) | 4 KB (identical) | 4 KB (identical) | 2 KB (-50%) |
| Maximum Clock Speed | 48 MHz | 48 MHz (identical) | 48 MHz (identical) | 48 MHz (identical) | 48 MHz (identical) | 48 MHz (identical) | 48 MHz (identical) |
| Operating Voltage | 2.0-3.6 V | 2.0-3.6 V (identical) | 2.0-3.6 V (identical) | 2.0-3.6 V (identical) | 2.0-3.6 V (identical) | 2.0-3.6 V (identical) | 4.2-5.5 V (5V variant) |
| USB Interface | USB 2.0 Full-Speed | USB 2.0 Full-Speed (identical) | USB 2.0 Full-Speed (identical) | USB 2.0 Full-Speed (identical) | USB 2.0 Full-Speed (identical) | USB 2.0 Full-Speed (identical) | USB 2.0 Full-Speed (identical) |
| ADC | 12-bit, 13 channels | 12-bit, 13 channels (identical) | 12-bit, 13 channels (identical) | 12-bit, 13 channels (identical) | 12-bit, 13 channels (identical) | 12-bit, 13 channels (identical) | 12-bit, 13 channels (identical) |
| Series | PIC XLP 18J (3.3V) | PIC XLP 18J | PIC XLP 18J | PIC XLP 18J | PIC XLP 18J | PIC XLP 18J | PIC 18F (5V F-series) |
Key Differentiators
- Highest Flash density in PIC18F45J50 family at the lowest cost (vs PIC18F46J50T-I/PT)
- 3.3V nanoWatt XLP deep sleep draws less than 100 nA (vs PIC18F4550T-I/PT)
- CTMU capacitive touch sensing on-chip (vs PIC18F4455T-I/PT)
Design Notes
Route the USB D+ (pin 15) and D- (pin 16) traces as a 90-ohm differential pair with characteristic impedance matched to the USB 2.0 specification. Maximum trace length should not exceed 50 mm on standard FR-4, and keep the pair away from switching regulators or high-frequency clock traces. Place the VUSB decoupling capacitor within 5 mm of the USB connector shell to meet radiated emissions requirements.
The PIC18F45J50T-I/PT must be powered from a 3.3V rail (2.0-3.6V); applying 5V will damage the part. If migrating from a PIC18F4455 5V design, add an MCP1700 or equivalent 3.3V LDO and verify the existing decoupling capacitance is compatible with the lower voltage. The on-chip 3.3V USB voltage regulator derives its power from VBUS and only supplies the USB transceiver, not the core logic.
Do not leave MCLR floating - tie it to VDD through a 10 kohm pull-up resistor, or the device may randomly reset in noisy environments. The Peripheral Pin Select (PPS) registers must be unlocked via EECON2 before configuration; failing to do so silently locks out remapped peripherals. For capacitive touch, calibrate CTMU current source per the datasheet's temperature compensation procedure to avoid baseline drift across -40C to +85C operation.
At 48 MHz clock with active USB and ADC, the PIC18F45J50T-I/PT typically dissipates around 60 mW. The 44-TQFP package has a thermal resistance (theta_JA) of approximately 50 C/W, giving a junction temperature rise of about 3C above ambient - well within the 125C junction limit. No heatsink is required for normal USB-HID duty cycles, but airflow should be considered if the device is sealed inside an enclosure with other heat sources.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - the PIC18F45J50 family targets consumer/industrial use, not automotive. Lead-free matte-tin plating on TQFP pins. Halogen-free status not specified in retrieved data.