PIC18F65J94-I/MR - 64-Pin 8-bit MCU with USB/LCD | Microchip
MPN: PIC18F65J94-I/MR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.32 | $5.32 |
| 10 | $4.79 | $47.90 |
| 100 | $4.25 | $425.00 |
| 500 | $3.82 | $1,910.00 |
| 1,000 | $3.4 | $3,400.00 |
PIC18F65J94-I/MR Overview
A microcontroller (MCU) is a single-chip computer that contains a processor core, non-volatile program memory (typically Flash), volatile data memory (RAM), and a rich set of peripherals. The PIC18 family is a Harvard-architecture 8-bit RISC microcontroller family by Microchip widely used in consumer, industrial, and automotive subsystems because of its deterministic instruction timing, mature toolchain, and broad peripheral integration. PIC18F65J94 belongs to the PIC18J sub-family, which adds features such as enhanced peripherals, segmented LCD drivers, and on-chip USB to the base PIC18 architecture.
Key features of this part include nanoWatt XLP sleep currents that extend battery life in Vbat-backed designs, a Charge Time Measurement Unit (CTMU) for capacitive touch and time-of-flight measurements, and a hardware Real-Time Clock/Calendar (RTCC) with its own oscillator. The integrated segmented LCD controller can directly drive up to 256 LCD segments, eliminating the need for an external LCD driver. The 64-pin QFN form factor provides a low-profile footprint suitable for space-constrained modules while exposing a large number of I/O and peripheral pins.
Typical applications include battery-backed metering devices (water, gas, electricity), USB-connected human-interface devices, industrial control panels with on-board LCDs, and portable medical instrumentation. The combination of USB, LCD, and CTMU enables single-chip designs that previously required multiple ICs, reducing both BOM cost and PCB area. The wide operating voltage range supported by the J-series (typically 2.0 V to 3.6 V) further simplifies battery-powered designs.
When designing with this MCU, designers should review the errata sheet, ensure the 3.3 V core voltage is supplied correctly on the J-series (the J devices operate from a single 2.0 V to 3.6 V supply without a built-in LDO regulator), and properly configure the LCD bias network. A unique feature on this page is a consolidated alternatives cross-reference plus practical design notes that go beyond the manufacturer datasheet.
Drop-in alternatives for PIC18F65J94-I/MR — 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 PIC18F65J94-I/MR (same form factor and footprint) — differing in Package, Operating Temperature, ADC, Core Architecture, Family.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F65J94T-I/MR
✅ Drop-In✓ In Stock
$4.78 / Unit
View Datasheet →PIC18F65J94-I/PT
✅ Drop-In✓ In Stock
$3.89 / Unit
View Datasheet →PIC18F65J94-I/PF
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F66J94-I/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F67J94-I/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F65J90-I/PT
✅ Drop-In✓ In Stock
$4.72 / Unit
View Datasheet →PIC18F65J94-I/MR Maximum Ratings & Electrical Characteristics
| Family | PIC18J |
| Core Architecture | 8-bit RISC (PIC18) |
| Program Memory (Flash) | 32 KB (16K x 16) |
| RAM | 4 KB |
| Maximum CPU Speed | 64 MHz (16 MIPS) |
| Number of Pins | 64 |
| Package | QFN-64 (9x9 mm) |
| Operating Temperature | -40 °C to +85 °C (Industrial) |
| USB | USB 2.0 Full-Speed (Device/Host/OTG) |
| LCD | Segmented LCD driver, up to 256 segments |
| Low-Power Feature | nanoWatt XLP technology |
| CTMU | Yes (Charge Time Measurement Unit) |
| RTCC | Yes (hardware Real-Time Clock/Calendar) |
| Vbat Backup | Yes (battery backup domain) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (per Abacus EU RoHS) |
PIC18F65J94-I/MR Pin Configuration
| Pin 1 | RF0/PMP0 — Digital I/O / Parallel Master Port bit 0 |
| Pin 2 | RF1/PMP1 — Digital I/O / Parallel Master Port bit 1 |
| Pin 3 | RF2/PMP2 — Digital I/O / Parallel Master Port bit 2 |
| Pin 4 | RF3/PMP3 — Digital I/O / Parallel Master Port bit 3 |
| Pin 5 | RF4/PMP4 — Digital I/O / Parallel Master Port bit 4 |
| Pin 6 | RF5/PMP5 — Digital I/O / Parallel Master Port bit 5 |
| Pin 7 | RF6/PMP6 — Digital I/O / Parallel Master Port bit 6 |
| Pin 8 | RF7/PMP7 — Digital I/O / Parallel Master Port bit 7 |
| Pin 9 | GND — Ground reference |
| Pin 10 | VDD — Positive supply (2.0 V - 3.6 V for J-series) |
| Pin 11 | RA0/AN0 — PORTA bit 0 / ADC channel 0 |
| Pin 12 | RA1/AN1 — PORTA bit 1 / ADC channel 1 |
| Pin 13 | RA2/AN2 — PORTA bit 2 / ADC channel 2 |
| Pin 14 | RA3/AN3 — PORTA bit 3 / ADC channel 3 |
| Pin 15 | RA4 — PORTA bit 4 |
| Pin 16 | RA5 — PORTA bit 5 |
| Pin 17 | RA6 — PORTA bit 6 |
| Pin 18 | RA7 — PORTA bit 7 |
| Pin 19 | GND — Ground reference |
| Pin 20 | VDD — Positive supply |
| Pin 21 | RB0 — PORTB bit 0 (interrupt-on-change capable) |
| Pin 22 | RB1 — PORTB bit 1 |
| Pin 23 | RB2 — PORTB bit 2 |
| Pin 24 | RB3 — PORTB bit 3 |
| Pin 25 | RB4 — PORTB bit 4 |
| Pin 26 | RB5 — PORTB bit 5 |
| Pin 27 | RB6 — PORTB bit 6 (ICSP clock) |
| Pin 28 | RB7 — PORTB bit 7 (ICSP data) |
| Pin 29 | RC0 — PORTC bit 0 |
| Pin 30 | RC1 — PORTC bit 1 |
| Pin 31 | RC2 — PORTC bit 2 |
| Pin 32 | RC3 — PORTC bit 3 |
| Pin 33 | RC4 — PORTC bit 4 |
| Pin 34 | RC5 — PORTC bit 5 |
| Pin 35 | RC6 — PORTC bit 6 |
| Pin 36 | RC7 — PORTC bit 7 |
| Pin 37 | RD0 — PORTD bit 0 |
| Pin 38 | RD1 — PORTD bit 1 |
| Pin 39 | RD2 — PORTD bit 2 |
| Pin 40 | RD3 — PORTD bit 3 |
| Pin 41 | RD4 — PORTD bit 4 |
| Pin 42 | RD5 — PORTD bit 5 |
| Pin 43 | RD6 — PORTD bit 6 |
| Pin 44 | RD7 — PORTD bit 7 |
| Pin 45 | RE0 — PORTE bit 0 |
| Pin 46 | RE1 — PORTE bit 1 |
| Pin 47 | RE2 — PORTE bit 2 |
| Pin 48 | RE3 — PORTE bit 3 |
| Pin 49 | RE4 — PORTE bit 4 |
| Pin 50 | RE5 — PORTE bit 5 |
| Pin 51 | RE6 — PORTE bit 6 |
| Pin 52 | RE7 — PORTE bit 7 |
| Pin 53 | Vbat — Battery backup supply for RTCC |
| Pin 54 | VDD — Positive supply |
| Pin 55 | GND — Ground reference |
| Pin 56 | VBUS — USB VBUS sense |
| Pin 57 | VDDUSB — USB transceiver supply (3.3 V) |
| Pin 58 | D+ — USB D+ data line |
| Pin 59 | D- — USB D- data line |
| Pin 60 | SOSCO/RTCC — Secondary oscillator output / RTCC |
| Pin 61 | SOSCI — Secondary oscillator input |
| Pin 62 | OSC1/CLKI — Primary oscillator input / external clock |
| Pin 63 | OSC2/CLKO — Primary oscillator output / clock out |
| Pin 64 | MCLR/RESET — Master Clear / Reset (active-low) |
Typical Applications
PIC18F65J94-I/MR is suitable for 7 applications: Battery-Backed Utility Metering, USB Human-Interface Devices, Industrial Control Panels with LCD, Portable Medical Instrumentation, Capacitive Touch User Interfaces, Automotive Aftermarket Accessories, Data-Acquisition Modules.
Battery-Backed Utility Metering
The PIC18F65J94-I/MR is purpose-built for battery-backed metering thanks to nanoWatt XLP deep-sleep currents, the integrated Vbat backup domain, and a hardware RTCC that keeps time and tamper registers alive on a coin cell for years. Its on-chip segmented LCD driver supports up to 256 segments, enough to display multi-tariff readings, units, status icons, and bar graphs without an external LCD driver. The 12-bit ADC reads sensor outputs such as current shunts or pulse counters with adequate resolution for residential and light-commercial metering. Use this part when a single-chip BOM matters more than raw throughput.
Recommended
USB Human-Interface Devices
With on-chip full-speed USB 2.0 (device/host/OTG), the PIC18F65J94-I/MR eliminates an external USB controller in custom HID, CDC, and proprietary USB products. The 64-pin QFN-64 form factor leaves plenty of I/O for buttons, encoders, LEDs, and indicator LCD panels, while the 16 MIPS throughput is sufficient for HID report rates up to 1000 Hz and CDC throughput for diagnostics. Engineers often pair it with a USB-C connector and a single 3.3 V LDO to build evaluation, training, and reference designs without needing a separate microcontroller plus USB bridge chip.
Recommended
Industrial Control Panels with LCD
When a control panel needs a numeric or segment LCD plus a USB service port and a handful of digital I/O, PIC18F65J94-I/MR is a strong single-chip solution. The CTMU enables capacitive touch keys for glass-front panels, the RTCC timestamps event logs, and the 12-bit ADC reads analogue panel signals such as temperature or pressure. Compared to using a host MCU plus separate LCD driver plus separate USB chip, this part shrinks the BOM, reduces firmware complexity, and helps meet long-life industrial certifications where component count is a design risk.
Recommended
Portable Medical Instrumentation
Battery-powered medical devices such as pulse oximeters, glucose meters, and handheld diagnostic probes benefit from PIC18F65J94-I/MR's nanoWatt XLP sleep behaviour, integrated LCD, and CTMU for touch-sense user interfaces. The 32 KB Flash accommodates mid-complexity application code with safety margins for revision histories, while the 4 KB RAM handles buffer averages and signal-conditioning pipelines. Use this part where deterministic 8-bit execution and long battery life outweigh the benefits of a Cortex-M core, and where the LCD integration cuts component count and PCB real estate.
Recommended
Capacitive Touch User Interfaces
The PIC18F65J94 family integrates a Charge Time Measurement Unit (CTMU) and mTouch sensing logic that turn any standard I/O pin into a capacitive touch electrode. Designers can build glass-front panels with sliders, wheels, and buttons without dedicated touch ICs. Pair the PIC18F65J94-I/MR with a segmented LCD driven by the same chip for an industrial-style HMI with both touch and visual feedback in one MCU. The 64-pin QFN provides enough pins for 16-32 touch channels plus LCD segment lines simultaneously.
Recommended
Automotive Aftermarket Accessories
For non-safety automotive accessories such as USB-programmable trip computers, USB-charging hubs with status displays, or 12 V-powered multi-function gauges, PIC18F65J94-I/MR delivers USB, segmented LCD, and battery-backup RTCC in a compact QFN footprint. Designers should be aware that this is the industrial (-40 °C to +85 °C) grade, not AEC-Q100 qualified; for under-hood or safety-relevant parts, an automotive-grade PIC18 K-series variant is required. Always validate against the application temperature profile before committing to production.
Recommended
Data-Acquisition Modules
Module makers integrating multi-channel analogue data acquisition benefit from the PIC18F65J94-I/MR's 12-bit ADC, USB connectivity for streaming to a host PC, and segmented LCD for local read-out. The 32 KB Flash accommodates calibration tables and DSP-style filtering, while 4 KB RAM buffers multi-kilosample streams before USB transmits them. With nanoWatt XLP, the module drops into deep sleep between scans, drawing microamps. This part is a good fit for handheld loggers, environmental sensors, and laboratory bench instruments where an 8-bit MCU is sufficient.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F65J94-I/MR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F65J94T-I/MR | PIC18F65J94-I/PT | PIC18F66J94-I/MR | PIC18F67J94-I/MR | PIC18F65J90-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | QFN-64 (9x9) | QFN-64 (9x9) - same | TQFP-64 (10x10) - different footprint, pin-compatible | QFN-64 (9x9) - same | QFN-64 (9x9) - same | TQFP-64 (10x10) - different footprint |
| Flash Memory | 32 KB | 32 KB (same die) | 32 KB (same die) | 64 KB (+100%) | 128 KB (+300%) | Smaller (J90 family) |
| Maximum CPU Speed | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) | 40 MHz (typical J90) |
| USB | Full-Speed USB 2.0 | Full-Speed USB 2.0 | Full-Speed USB 2.0 | Full-Speed USB 2.0 | Full-Speed USB 2.0 | No |
| LCD Segments | Up to 256 | Up to 256 | Up to 256 | Up to 256 | Up to 256 | Up to 192 (typical J90) |
| ADC | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit | 10-bit or 12-bit (variant-dependent) |
| Low-Power Feature | nanoWatt XLP + Vbat | nanoWatt XLP + Vbat | nanoWatt XLP + Vbat | nanoWatt XLP + Vbat | nanoWatt XLP + Vbat | nanoWatt XLP + Vbat |
| Temperature Range | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) |
Key Differentiators
- Single-chip USB + LCD + RTCC + CTMU solution (vs PIC18F46K22-I/P)
- QFN-64 with larger Flash density in same footprint (vs PIC18F65J94T-I/MR)
- Drop-in QFN-64 with same peripherals (vs PIC18F65J94-I/PT (TQFP-64))
Design Notes
The PIC18F65J94-I/MR is a J-series device without an internal voltage regulator, so it requires a clean external 3.3 V supply (typical operating range 2.0 V to 3.6 V). Add 100 nF decoupling close to every VDD pin, plus a bulk 1-10 uF on the main rail, to handle USB inrush currents and segmented LCD switching transients. For Vbat backup, route a coin-cell through a low-leakage diode or load switch; nanoWatt XLP keeps Vbat current in the nano-amp range with the RTCC running.
At 64 MHz full throughput the PIC18F65J94-I/MR dissipates well under 100 mW and does not require a heatsink. However, the QFN-64 exposed thermal pad MUST be soldered to a grounded copper pour to achieve the rated thermal resistance and to provide a low-impedance ground return. Without a proper thermal pad connection the die temperature rises under sustained USB traffic, which can degrade ADC accuracy over time.
Route D+ and D- as a 90-ohm differential pair with continuous reference ground, keep the pair as short as possible, and avoid stubs. Place the USB DP pull-up resistor (if used in device mode) close to the D+ pin. Place the 12 MHz primary crystal (or resonator) within a few millimetres of OSC1/OSC2 with short traces and a guarded ground pour. Avoid routing LCD segments across noisy digital traces to keep display contrast clean.
Always consult the PIC18F65J94 device errata before finalising firmware - known silicon anomalies include ADC and CTMU behaviour that may require work-arounds. Do not assume the I-temp grade suits under-hood automotive use; for AEC-Q100 applications, choose an automotive-grade variant. Remember that RTCC and Vbat backup require proper VBAT pin handling - leaving VBAT floating can cause unpredictable power-up behaviour.
Compliance Information
RoHS and REACH compliance per Abacus Technologies listing (EU RoHS Compliant, DRC Conflict Free). AEC-Q100 NOT qualified - industrial (-40 to +85 °C) grade only. For automotive, select an AEC-Q100-qualified PIC18 variant.
