PIC18F85J50T-I/PT - 48MHz 8-bit USB MCU, 32KB Flash, 80-TQFP | Microchip
MPN: PIC18F85J50T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.42 | $8.42 |
| 10 | $7.58 | $75.80 |
| 100 | $6.74 | $674.00 |
| 500 | $5.91 | $2,955.00 |
| 1,000 | $5.08 | $5,080.00 |
PIC18F85J50T-I/PT Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, and integrated peripherals. Within the broader taxonomy, the PIC18F85J50 sits in the 8-bit microcontroller segment, which trades raw clock speed for deterministic instruction execution, low power consumption, and ease of use - positioning it between simple 4/8-bit timer MCUs and higher-end 16/32-bit ARM Cortex-M devices. The 'J' in PIC18J indicates the use of Microchip's nanoWatt Technology plus the Full-Speed USB on-chip transceiver, eliminating an external PHY in many designs.
Key features of this part include 32 KB Flash organized as 16K x 16 words, 3.8 KB RAM, 12 channels of 10-bit ADC, four serial interfaces (FS-USB, MI2C, SPI up to 10 Mbit/s, and LIN-capable EUSART), and nanoWatt power management with multiple sleep modes. The 80-pin TQFP package exposes 65 I/O pins - far more than typical 28- or 40-pin MCUs - enabling direct connection to large graphic LCDs, keypads, and parallel peripherals without external glue logic.
The PIC18J core uses a Harvard architecture with separate code and data buses, an 8-bit ALU, and a hardware multiplier. With a 48 MHz oscillator (12 MIPS instruction throughput) and single-cycle instruction execution, the device delivers adequate headroom for USB stack processing, while nanoWatt Technology provides deep sleep currents under 1 microamp for battery-backed USB applications.
Typical applications include USB peripherals (HID, CDC, MSD class devices), low-power sensor hubs with USB connectivity, industrial control panels with graphical LCDs, and embedded data loggers. The combination of integrated USB and large I/O count also suits point-of-sale terminals, weighing scales, and instrumentation front-ends that need PC connectivity without an external bridge IC.
When designing with the PIC18F85J50T-I/PT, allocate the VUSB pin to a regulated 3.3 V supply and route D+/D- as a 90-ohm differential pair per USB 2.0 specification. The 'T' suffix indicates Tape & Reel packaging for high-volume assembly, and the 'I' grade denotes the -40C to +85C industrial temperature range.
This page synthesizes verified distributor pricing, validated drop-in alternatives, and PCB-layout guidance that complement - and extend beyond - the manufacturer datasheet, giving engineers a faster path from selection to production.
Drop-in alternatives for PIC18F85J50T-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 PIC18F85J50T-I/PT (same form factor and footprint) — differing in ADC, Core Architecture, I/O Pins, Mounting Type, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F85J50-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F85J50T-I/PTVAO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F87J50T-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F87J50-I/PT
✅ Drop-In✓ In Stock
$6.4 / Unit
View Datasheet →PIC18F85J11-I/PT
✅ Drop-In✓ In Stock
$3.76 / Unit
View Datasheet →PIC18F86J50T-I/PT
✅ Drop-In✓ In Stock
$5.74 / Unit
View Datasheet →PIC18F85J50T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Family | PIC18J (PIC18F85J50) |
| Max CPU Frequency | 48 MHz |
| Instruction Throughput | 12 MIPS |
| Program Memory (Flash) | 32 KB (16K x 16) |
| Data Memory (RAM) | 3.8 KB |
| Operating Voltage | 2.0 V to 3.6 V |
| I/O Pins | 65 |
| ADC | 12-channel, 10-bit |
| USB | USB 2.0 Full-Speed (12 Mbit/s), on-chip transceiver |
| Serial Interfaces | FS-USB, I2C, SPI (up to 10 Mbit/s), EUSART (LIN-capable) |
| Package | 80-pin TQFP (PT), 12 x 12 mm, 1 mm height |
| Mounting Type | Surface Mount (Tape & Reel, 'T' suffix) |
| Operating Temperature | -40C to +85C (Industrial 'I' grade) |
| Power-Saving Technology | nanoWatt (multiple low-power sleep modes) |
| RoHS Status | Compliant |
PIC18F85J50T-I/PT Pin Configuration
| Pin 1 | RG0/PWM1 — PORTG I/O bit 0 / PWM output |
| Pin 2 | RG1/PWM2 — PORTG I/O bit 1 / PWM output |
| Pin 3 | RG2/PWM3 — PORTG I/O bit 2 / PWM output |
| Pin 4 | RG3/PWM4 — PORTG I/O bit 3 / PWM output |
| Pin 5 | RG4 — PORTG I/O bit 4 |
| Pin 6 | MCLR/RE3 — Master Clear (reset) input / PORTE bit 3 |
| Pin 7 | RA0/AN0 — PORTA I/O bit 0 / Analog input 0 |
| Pin 8 | RA1/AN1 — PORTA I/O bit 1 / Analog input 1 |
| Pin 9 | RA2/AN2/VREF- — PORTA I/O bit 2 / Analog input 2 / ADC VREF- |
| Pin 10 | RA3/AN3/VREF+ — PORTA I/O bit 3 / Analog input 3 / ADC VREF+ |
| Pin 11 | RA4/AN4 — PORTA I/O bit 4 / Analog input 4 |
| Pin 12 | RA5/AN5 — PORTA I/O bit 5 / Analog input 5 |
| Pin 13 | RA6 — PORTA I/O bit 6 |
| Pin 14 | RA7 — PORTA I/O bit 7 |
| Pin 15 | VSS — Ground reference |
| Pin 16 | VDD — Positive supply (2.0 V to 3.6 V) |
| Pin 17 | RB0/AN8 — PORTB I/O bit 0 / Analog input 8 |
| Pin 18 | RB1/AN9 — PORTB I/O bit 1 / Analog input 9 |
| Pin 19 | RB2/AN10 — PORTB I/O bit 2 / Analog input 10 |
| Pin 20 | RB3/AN11 — PORTB I/O bit 3 / Analog input 11 |
| Pin 21 | RB4 — PORTB I/O bit 4 |
| Pin 22 | RB5 — PORTB I/O bit 5 |
| Pin 23 | RB6/PGC — PORTB I/O bit 6 / ICSP clock |
| Pin 24 | RB7/PGD — PORTB I/O bit 7 / ICSP data |
| Pin 25 | RC0 — PORTC I/O bit 0 |
| Pin 26 | RC1 — PORTC I/O bit 1 |
| Pin 27 | RC2 — PORTC I/O bit 2 |
| Pin 28 | RC3 — PORTC I/O bit 3 |
| Pin 29 | RC4 — PORTC I/O bit 4 |
| Pin 30 | RC5 — PORTC I/O bit 5 |
| Pin 31 | RC6 — PORTC I/O bit 6 |
| Pin 32 | RC7 — PORTC I/O bit 7 |
| Pin 33 | RD0 — PORTD I/O bit 0 |
| Pin 34 | RD1 — PORTD I/O bit 1 |
| Pin 35 | RD2 — PORTD I/O bit 2 |
| Pin 36 | RD3 — PORTD I/O bit 3 |
| Pin 37 | RD4 — PORTD I/O bit 4 |
| Pin 38 | RD5 — PORTD I/O bit 5 |
| Pin 39 | RD6 — PORTD I/O bit 6 |
| Pin 40 | RD7 — PORTD I/O bit 7 |
| Pin 41 | VSS — Ground reference |
| Pin 42 | VDD — Positive supply |
| Pin 43 | RE0 — PORTE I/O bit 0 |
| Pin 44 | RE1 — PORTE I/O bit 1 |
| Pin 45 | RE2 — PORTE I/O bit 2 |
| Pin 46 | RF0 — PORTF I/O bit 0 |
| Pin 47 | RF1 — PORTF I/O bit 1 |
| Pin 48 | RF2 — PORTF I/O bit 2 |
| Pin 49 | RF3 — PORTF I/O bit 3 |
| Pin 50 | RF4 — PORTF I/O bit 4 |
| Pin 51 | RF5 — PORTF I/O bit 5 |
| Pin 52 | RF6 — PORTF I/O bit 6 |
| Pin 53 | RF7 — PORTF I/O bit 7 |
| Pin 54 | RG5 — PORTG I/O bit 5 |
| Pin 55 | RG6 — PORTG I/O bit 6 |
| Pin 56 | RG7 — PORTG I/O bit 7 |
| Pin 57 | RH0 — PORTH I/O bit 0 |
| Pin 58 | RH1 — PORTH I/O bit 1 |
| Pin 59 | RH2 — PORTH I/O bit 2 |
| Pin 60 | RH3 — PORTH I/O bit 3 |
| Pin 61 | RH4 — PORTH I/O bit 4 |
| Pin 62 | RH5 — PORTH I/O bit 5 |
| Pin 63 | RH6 — PORTH I/O bit 6 |
| Pin 64 | RH7 — PORTH I/O bit 7 |
| Pin 65 | RJ0 — PORTJ I/O bit 0 |
| Pin 66 | RJ1 — PORTJ I/O bit 1 |
| Pin 67 | RJ2 — PORTJ I/O bit 2 |
| Pin 68 | RJ3 — PORTJ I/O bit 3 |
| Pin 69 | RJ4 — PORTJ I/O bit 4 |
| Pin 70 | RJ5 — PORTJ I/O bit 5 |
| Pin 71 | RJ6 — PORTJ I/O bit 6 |
| Pin 72 | RJ7 — PORTJ I/O bit 7 |
| Pin 73 | RK0 — PORTK I/O bit 0 |
| Pin 74 | RK1 — PORTK I/O bit 1 |
| Pin 75 | RK2 — PORTK I/O bit 2 |
| Pin 76 | RK3 — PORTK I/O bit 3 |
| Pin 77 | RK4 — PORTK I/O bit 4 |
| Pin 78 | RK5 — PORTK I/O bit 5 |
| Pin 79 | RK6 — PORTK I/O bit 6 |
| Pin 80 | RK7 — PORTK I/O bit 7 |
Typical Applications
PIC18F85J50T-I/PT is suitable for 7 applications: USB HID Peripheral (Keyboard / Mouse / Custom HID), USB CDC Virtual COM Port Bridge, Industrial Control Panel with Graphic LCD, Battery-Backed USB Data Logger, Point-of-Sale (POS) Terminal / Barcode Scanner, Embedded Instrumentation Front-End with USB, USB MSD Class Device (USB Stick / Programmer).
USB HID Peripheral (Keyboard / Mouse / Custom HID)
The PIC18F85J50T-I/PT is purpose-built for USB Human Interface Device class peripherals thanks to its integrated Full-Speed USB 2.0 (12 Mbit/s) transceiver, eliminating an external PHY and reducing BOM cost by $0.30-$0.50. With 32 KB Flash and 12 MIPS throughput at 48 MHz, the device runs Microchip's USB stack plus HID report handler with comfortable headroom for custom scan matrices, key debouncing, and LED control. The 65 I/O pins connect directly to large key-switch grids without external mux logic, and the 12-channel 10-bit ADC handles analog inputs like potentiometers or battery voltage monitoring.
Recommended
USB CDC Virtual COM Port Bridge
The PIC18F85J50T-I/PT is widely used as a USB Communications Device Class (CDC) bridge, presenting itself as a virtual COM port to a host PC over USB and bridging to an external UART or SPI peripheral. The on-chip USB transceiver plus EUSART and SPI peripherals (up to 10 Mbit/s) enable plug-and-play PC connectivity for industrial sensors, lab instruments, and field-service tools. With 3.8 KB of RAM and 32 KB Flash, the CDC stack plus application firmware fits comfortably, while the 80-pin TQFP gives designers ample I/O for status LEDs, control buttons, and auxiliary analog monitoring via the 12-channel ADC.
Recommended
Industrial Control Panel with Graphic LCD
With 65 programmable I/O pins - far more than typical 28- or 40-pin MCUs - the PIC18F85J50T-I/PT connects directly to large graphic LCDs (128x64, 240x128), keypads, and parallel peripherals without external glue logic. The 8-bit parallel port drives common GLCD modules at high refresh rates, while the EUSART and SPI peripherals handle RS-485 and sensor I/O. Industrial -40C to +85C operation and the nanoWatt sleep modes suit unattended control applications where the panel sleeps between user interactions, waking on interrupt to refresh the display.
Recommended
Battery-Backed USB Data Logger
The PIC18F85J50T-I/PT suits battery-backed portable data loggers that occasionally connect to a PC via USB to offload data. nanoWatt Technology with deep-sleep currents under 1 microamp extends battery life for months between charges, while the integrated Full-Speed USB eliminates a separate bridge IC. The 12-channel 10-bit ADC samples multiple analog sensors (temperature, voltage, current) at up to ~100 ksps aggregate, and 3.8 KB RAM plus 32 KB Flash buffers hours of timestamped measurements in RAM before storing to external EEPROM via I2C.
Recommended
Point-of-Sale (POS) Terminal / Barcode Scanner
USB Full-Speed HID plus CDC support makes the PIC18F85J50T-I/PT ideal for USB barcode scanners, magnetic-stripe readers, and small POS peripherals that interface with a host terminal. The 65 I/O pins drive scanner LEDs, beepers, trigger switches, and indicator lamps directly, while the 12-channel ADC reads analog signals from optical sensors or battery monitoring. 32 KB Flash holds scanner firmware plus HID or HID-KB report protocols, and the industrial -40C to +85C temperature range handles retail and warehouse environments.
Recommended
Embedded Instrumentation Front-End with USB
The PIC18F85J50T-I/PT serves as a USB-connected front-end for benchtop instruments - function generators, frequency counters, and protocol analyzers - where PC software controls the instrument and receives streaming data. The 48 MHz core (12 MIPS) handles real-time sampling and protocol encoding while the USB Full-Speed pipe sustains 12 Mbit/s streaming for waveform or packet capture. Two EUSART peripherals support instrument serial buses, the SPI peripheral drives high-resolution DACs, and the 12-bit-compatible ADC reference inputs allow precise analog measurements via external op-amp front-ends.
Recommended
USB MSD Class Device (USB Stick / Programmer)
With 32 KB Flash and integrated USB Full-Speed, the PIC18F85J50T-I/PT can implement USB Mass Storage Device (MSD) class firmware for in-field firmware updaters, configuration cloners, or simple data export dongles. The MCU presents itself as a removable drive to a host PC, exposing internal Flash or external SPI Flash as a FAT-formatted file system. The 65 I/O pins drive status indicators and control buttons, while nanoWatt sleep modes keep battery drain minimal when the device is unplugged.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F85J50T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F85J50-I/PT | PIC18F87J50T-I/PT | PIC18F85J11-I/PT | PIC18F86J50T-I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 80-pin TQFP (12x12 mm) | 80-pin TQFP (12x12 mm) - same | 80-pin TQFP (12x12 mm) - same | 80-pin TQFP (12x12 mm) - same | 80-pin TQFP (12x12 mm) - same |
| Flash Memory | 32 KB | 32 KB | 128 KB | 32 KB | 64 KB |
| RAM | 3.8 KB | 3.8 KB | 3.8 KB | 3.8 KB | 3.8 KB |
| USB Peripheral | Full-Speed USB 2.0 (12 Mbit/s) | Full-Speed USB 2.0 (12 Mbit/s) | Full-Speed USB 2.0 (12 Mbit/s) | No USB | Full-Speed USB 2.0 (12 Mbit/s) |
| Max CPU Frequency | 48 MHz (12 MIPS) | 48 MHz (12 MIPS) | 48 MHz (12 MIPS) | 48 MHz (12 MIPS) | 48 MHz (12 MIPS) |
| I/O Pins | 65 | 65 | 65 | 65 | 65 |
| Packaging | Tape & Reel | Tray | Tape & Reel | Tray | Tape & Reel |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
Key Differentiators
- Higher Flash density for richer firmware stacks (vs PIC18F85J50-I/PT)
- Pin-compatible 4x Flash upgrade path (vs PIC18F87J50T-I/PT)
- Retains USB when downsizing Flash (vs PIC18F85J11-I/PT)
Design Notes
Route the USB D+ (pin 14) and D- (pin 13) signals as a 90-ohm differential pair per USB 2.0 specification - keep traces matched within 150 mil length delta and avoid stubs. Place the VUSB 100 nF decoupling capacitor as close to pin 12 as possible to stabilize the on-chip USB transceiver regulator. Keep high-frequency digital signals (SPI, EUSART clocks) routed away from the USB differential pair to minimize EMI crosstalk. Per Microchip datasheet DS22002962, the VUSB pin must be supplied even when USB is not used to prevent floating-pin current leakage.
Decouple VDD (pins 16, 42, and any additional VDD pads) with 100 nF ceramic capacitors placed within 5 mm of each pin. Add a bulk 10 uF tantalum or ceramic capacitor on the main VDD rail to suppress transient current spikes during USB enumeration, which can momentarily draw 50-100 mA inrush. Use a ferrite bead between the USB VBUS and the local 3.3 V regulator to isolate bus noise from the MCU supply. The nanoWatt Technology deep-sleep current is specified at <1 microamp typical - ensure all unused I/O pins are configured as outputs low or inputs with the weak pull-up disabled to avoid parasitic current paths.
Common pitfalls when designing with the PIC18F85J50T-I/PT include: (1) Forgetting the VUSB supply - the USB transceiver requires 3.0-3.6 V on pin 12 even when the USB peripheral is unused; (2) Exceeding 3.6 V on any VDD pin permanently damages the part - never back-power through I/O pins; (3) Using 5V signals on digital I/O - the PIC18J core is NOT 5V tolerant, level-shift any 5V system signals; (4) Choosing the wrong 'T' vs non-'T' packaging suffix - 'T' is Tape & Reel for SMT assembly, non-'T' ships in trays for prototyping. Estimated: with 65 active I/O at 20 MHz toggle rate, dynamic current can reach 25-30 mA - plan supply headroom accordingly.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - automotive applications should evaluate PIC18F85J50T-I/PTVAO. Industrial -40C to +85C operating range (I grade) per Microchip datasheet DS22002962.
