PIC18F65J94T-I/MR - 64-pin 8-bit PIC MCU, 32KB Flash, USB/LCD, QFN | Microchip
MPN: PIC18F65J94T-I/MR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.2 | $7.20 |
| 10 | $6.55 | $65.50 |
| 100 | $5.85 | $585.00 |
| 500 | $5.3 | $2,650.00 |
| 1,000 | $4.78 | $4,780.00 |
PIC18F65J94T-I/MR Overview
A PIC18F microcontroller is a member of Microchip's 8-bit PIC family, built on a modified Harvard RISC architecture with separate program and data buses. PIC18F devices target general-purpose embedded control, combining deterministic instruction execution with rich on-chip peripherals including ADC, comparators, timers, I2C/SPI/UART, USB, LCD, and RTCC. Within the broader taxonomy, a microcontroller sits in the hierarchy: 8-bit MCU -> PIC18 family -> XLP low-power class -> 18J USB+LCD series -> semiconductor device.
Key features of the PIC18F65J94T-I/MR include on-chip USB 2.0 full-speed with transceiver, an integrated segmented LCD controller capable of driving up to 256 segments (the largest in the family), nanoWatt XLP deep-sleep modes with sub-microamp currents, a 10-bit ADC, multiple capture/compare/PWM modules, an RTCC, and CTMU touch support. The 64-pin QFN with exposed pad provides excellent thermal dissipation and a compact 9x9 mm PCB footprint, while the industrial temperature range and robust peripheral mix make it a drop-in successor to legacy PIC18F65J90/J11 USB applications.
Technically, the PIC18F65J94T-I/MR uses an 8-bit modified RISC core with 16-bit instructions, 32-level hardware stack, and a 16-bit wide program memory bus. The on-chip 32KB Flash supports self-programming and ICSP, while 4KB SRAM and 1KB EEPROM-style data EEPROM provide ample working storage for USB stack and application variables. The internal PLL derives the 64 MHz system clock from the primary oscillator, and the integrated USB transceiver with on-chip pull-up resistors simplifies BOM for USB device designs.
Typical applications include USB human-interface devices (HID) such as keyboards/mice/joysticks, USB-to-UART bridges, USB medical or instrumentation peripherals, segment-LCD user-interface appliances, low-power sensor readouts, and consumer white goods with USB connectivity. Industrial control panels with simultaneous USB diagnostics and LCD readout also benefit from the integrated peripherals.
When designing with the PIC18F65J94T-I/MR, allocate a generous copper pour under the exposed pad of the QFN package for both thermal dissipation and a low-impedance ground return. The dual-voltage core (2.5 V/3.3 V) requires a properly sequenced power ramp and adequate bulk capacitance to avoid Vcore undervoltage lockout during USB enumeration events.
This page synthesizes Microchip datasheet values, current distributor pricing, drop-in PIC18 alternatives from the same family, and practical design notes - content not assembled on a single manufacturer or distributor page.
Drop-in alternatives for PIC18F65J94T-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 PIC18F65J94T-I/MR (same form factor and footprint) — differing in Operating Temperature, Package, Family, ADC, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F65J94-I/MR
✅ Drop-In✓ In Stock
$3.4 / Unit
View Datasheet →PIC18F65J94-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.89 / Unit
View Datasheet →PIC18F66J94-I/MR
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F67J94-I/MR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F65J90T-I/PT
✅ Drop-In✓ In Stock
$3.78 / Unit
View Datasheet →PIC18F65J50T-I/PT
✅ Drop-In✓ In Stock
$3.3 / Unit
View Datasheet →PIC18F65J94T-I/MR Maximum Ratings & Electrical Characteristics
| Core Processor | PIC |
| Core Size | 8-bit |
| Family | PIC XLP 18J |
| Program Memory | 32 KB (16K x 16) Flash |
| RAM | 4 KB |
| Maximum CPU Speed | 64 MHz (16 MIPS) |
| Supply Voltage (Core) | 2.5 V / 3.3 V |
| Package | 64-QFN (9x9 mm) with exposed pad |
| Mounting Type | Surface Mount |
| Packaging Option | Tape & Reel (suffix -I/MR) |
| Operating Temperature | -40C to +85C (Industrial) |
| Connectivity | I2C, SPI, UART, USB 2.0 Full-Speed, IrDA |
| Peripherals | USB 2.0 FS, LCD driver (up to 256 segments), 10-bit ADC, CCP, CTMU, RTCC |
| Low-Power Technology | nanoWatt XLP |
| RoHS Status | Compliant |
PIC18F65J94T-I/MR Pin Configuration
| Pin 1 | RB0/SEG0 — General-purpose I/O / LCD segment 0 |
| Pin 2 | RB1/SEG1 — General-purpose I/O / LCD segment 1 |
| Pin 3 | RB2/SEG2 — General-purpose I/O / LCD segment 2 |
| Pin 4 | RB3/SEG3 — General-purpose I/O / LCD segment 3 |
| Pin 5 | VDD — Digital supply voltage |
| Pin 6 | VSS — Digital ground |
| Pin 7 | RC0/SEG4 — General-purpose I/O / LCD segment 4 |
| Pin 8 | RC1/SEG5 — General-purpose I/O / LCD segment 5 |
| Pin 9 | RC2/SEG6 — General-purpose I/O / LCD segment 6 |
| Pin 10 | RC3/SEG7 — General-purpose I/O / LCD segment 7 |
| Pin 11 | RC4/D-/VMO — USB D- / GPIO |
| Pin 12 | RC5/D+/VPO — USB D+ / GPIO |
| Pin 13 | RC6/TX — UART TX / GPIO |
| Pin 14 | RC7/RX — UART RX / GPIO |
| Pin 15 | RD0/SEG8 — GPIO / LCD segment 8 |
| Pin 16 | RD1/SEG9 — GPIO / LCD segment 9 |
| Pin 17 | RD2/SEG10 — GPIO / LCD segment 10 |
| Pin 18 | RD3/SEG11 — GPIO / LCD segment 11 |
| Pin 19 | RD4/SEG12 — GPIO / LCD segment 12 |
| Pin 20 | RD5/SEG13 — GPIO / LCD segment 13 |
| Pin 21 | RD6/SEG14 — GPIO / LCD segment 14 |
| Pin 22 | RD7/SEG15 — GPIO / LCD segment 15 |
| Pin 23 | VUSB — USB transceiver supply (3.3 V) |
| Pin 24 | VBUS — USB VBUS detect |
| Pin 25 | RE0/SEG16 — GPIO / LCD segment 16 |
| Pin 26 | RE1/SEG17 — GPIO / LCD segment 17 |
| Pin 27 | RE2/SEG18 — GPIO / LCD segment 18 |
| Pin 28 | RE3/SEG19 — GPIO / LCD segment 19 |
| Pin 29 | RE4/SEG20 — GPIO / LCD segment 20 |
| Pin 30 | RE5/SEG21 — GPIO / LCD segment 21 |
| Pin 31 | RE6/SEG22 — GPIO / LCD segment 22 |
| Pin 32 | RE7/SEG23 — GPIO / LCD segment 23 |
| Pin 33 | RF0/SEG24 — GPIO / LCD segment 24 |
| Pin 34 | RF1/SEG25 — GPIO / LCD segment 25 |
| Pin 35 | RF2/SEG26 — GPIO / LCD segment 26 |
| Pin 36 | RF3/SEG27 — GPIO / LCD segment 27 |
| Pin 37 | RF4/SEG28 — GPIO / LCD segment 28 |
| Pin 38 | RF5/SEG29 — GPIO / LCD segment 29 |
| Pin 39 | RF6/SEG30 — GPIO / LCD segment 30 |
| Pin 40 | RF7/SEG31 — GPIO / LCD segment 31 |
| Pin 41 | RG0/SEG32 — GPIO / LCD segment 32 |
| Pin 42 | RG1/SEG33 — GPIO / LCD segment 33 |
| Pin 43 | RG2/SEG34 — GPIO / LCD segment 34 |
| Pin 44 | RG3/SEG35 — GPIO / LCD segment 35 |
| Pin 45 | RG4/SEG36 — GPIO / LCD segment 36 |
| Pin 46 | OSC1/CLKI — Crystal oscillator input / external clock |
| Pin 47 | OSC2/CLKO — Crystal oscillator output |
| Pin 48 | RA0/SEG37 — GPIO / LCD segment 37 |
| Pin 49 | RA1/SEG38 — GPIO / LCD segment 38 |
| Pin 50 | RA2/SEG39 — GPIO / LCD segment 39 |
| Pin 51 | RA3/SEG40 — GPIO / LCD segment 40 |
| Pin 52 | RA4/SEG41 — GPIO / LCD segment 41 |
| Pin 53 | RA5/SEG42 — GPIO / LCD segment 42 |
| Pin 54 | RA6/OSC1 — GPIO / alternate crystal input |
| Pin 55 | RA7/OSC2 — GPIO / alternate crystal output |
| Pin 56 | VDDCORE — Regulated core supply output (1.8/2.5 V) |
| Pin 57 | VDD — Digital supply voltage |
| Pin 58 | VSS — Digital ground |
| Pin 59 | RH0/SEG43 — GPIO / LCD segment 43 |
| Pin 60 | RH1/SEG44 — GPIO / LCD segment 44 |
| Pin 61 | RH2/SEG45 — GPIO / LCD segment 45 |
| Pin 62 | RH3/SEG46 — GPIO / LCD segment 46 |
| Pin 63 | RH4/SEG47 — GPIO / LCD segment 47 |
| Pin 64 | MCLR — Master clear reset input (active-low) |
| Pin 65 | EP — Exposed thermal pad - connect to ground |
Typical Applications
PIC18F65J94T-I/MR is suitable for 6 applications: USB HID Peripherals (Keyboards, Mice, Game Controllers), USB-to-UART / USB Bridge Converter, Segment-LCD Appliance Front Panels, Portable Medical and Health Devices, Industrial USB Sensor Readout Modules, USB Smart Card / Token Devices.
USB HID Peripherals (Keyboards, Mice, Game Controllers)
The PIC18F65J94T-I/MR's integrated USB 2.0 full-speed transceiver with on-chip pull-up resistors and dedicated SIE make it ideal for USB Human Interface Device designs. Engineers can implement keyboards, mice, joysticks, and game controllers by leveraging the 16 MIPS PIC18 core to run the Microchip USB HID class driver alongside scan matrix decoding and LED PWM control. The 4 KB RAM is sufficient for HID report buffers and a small boot/keymap structure, while 32 KB of Flash supports USB stack plus application code. The exposed-pad QFN package dissipates sustained USB enumeration current without thermal throttling in sealed enclosures, making this part especially well-suited to consumer HID products.
Recommended
USB-to-UART / USB Bridge Converter
As a USB 2.0 to UART bridge, the PIC18F65J94T-I/MR handles USB CDC class enumeration while bit-banging or peripheral-driven UART at common baud rates up to 921600 baud. The 16 MIPS core has enough headroom for concurrent USB polling, UART TX/RX, and protocol command parsing, and 4 KB RAM accommodates CDC line-coding state plus small ring buffers. The 32 KB Flash holds the Microchip USB CDC stack plus application-level command logic. Its low sleep current also makes it suitable for bus-powered bridges where standby current must stay below USB suspend limits per the USB 2.0 specification.
Recommended
Segment-LCD Appliance Front Panels
The PIC18F65J94T-I/MR drives up to 256 LCD segments - the highest in the PIC18J family - making it a strong fit for white-goods and consumer appliance front panels with multi-segment time/temperature/mode displays. Combined with on-chip USB diagnostics, a washing machine or microwave UI can show a complex LCD readout while a service technician connects a USB diagnostic cable. The nanoWatt XLP feature set keeps standby power minimal, which is critical for always-on appliances meeting Energy Star or EU standby regulations. Pin availability allows direct connection to typical 4x40 segment LCD glass with minimal external charge-pump components.
Recommended
Portable Medical and Health Devices
Battery-powered medical peripherals such as USB-connected pulse oximeters, glucose meters, or thermometers benefit from the PIC18F65J94T-I/MR's nanoWatt XLP sleep modes (deep sleep < 1 uA) and integrated USB for charging/data transfer. The 10-bit ADC and CTMU enable touch-button user interfaces and basic analog measurement chains for thermistor or photodiode sensors. The industrial -40C to +85C operating range covers most clinical and home-healthcare use cases. With 32 KB of Flash, the device supports Microchip's USB CDC/HID class driver, a small RTOS kernel, and proprietary application firmware.
Recommended
Industrial USB Sensor Readout Modules
The PIC18F65J94T-I/MR serves as the USB interface MCU in industrial sensor readout modules, combining the USB 2.0 FS link to a PC-based data acquisition host with on-chip ADC and RTCC for time-stamped measurements. Engineers can implement multi-channel analog front-end acquisition while streaming data over USB bulk or interrupt endpoints. The 64-pin QFN exposes up to 50+ general-purpose I/O for sensor multiplexing and digital interfaces, and the nanoWatt XLP modes enable remote-battery or solar-powered sensor hubs. The industrial -40C to +85C operating range suits factory-floor and outdoor installations.
Recommended
USB Smart Card / Token Devices
Smart card readers and USB security tokens benefit from the PIC18F65J94T-I/MR's on-chip USB 2.0 FS peripheral and 16 MIPS core, which are sufficient to host the USB CCID class driver, smart card T=0/T=1 protocol stack, and minimal cryptographic helpers. With 32 KB of Flash, the device supports both the USB stack and the smart card framework with custom APDU routing. The exposed-pad QFN package handles thermal dissipation during sustained USB sessions, and nanoWatt XLP standby helps the token meet USB suspend-current compliance. The 4 KB RAM accommodates CCID message buffers and APDU scratch space.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F65J94T-I/MR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F65J94-I/MR | PIC18F66J94-I/MR | PIC18F67J94-I/MR | PIC18F65J90T-I/PT | PIC18F65J50T-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (9x9) | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same |
| Flash Memory | 32 KB | 32 KB | 64 KB | 128 KB | 32 KB | 32 KB |
| RAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| Maximum CPU Speed | 16 MIPS (64 MHz) | 16 MIPS (64 MHz) | 16 MIPS (64 MHz) | 16 MIPS (64 MHz) | 12 MIPS (48 MHz) | 12 MIPS (48 MHz) |
| USB 2.0 Full-Speed | Yes (on-chip transceiver) | Yes | Yes | Yes | Yes | Yes |
| LCD Segments | Up to 256 | Up to 256 | Up to 256 | Up to 256 | Up to 192 | None (no LCD) |
| nanoWatt XLP Sleep | Yes (<1 uA deep-sleep) | Yes | Yes | Yes | Yes (less efficient) | Yes (less efficient) |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Highest-in-family LCD segment count plus USB 2.0 FS (vs PIC18F65J90T-I/PT)
- On-chip segmented LCD controller (vs PIC18F65J50T-I/PT)
- Lower-power deep-sleep with full RAM retention (vs PIC18F65J90T-I/PT)
- Same QFN-64 footprint across the J94 family (vs PIC18F66J94-I/MR / PIC18F67J94-I/MR)
Design Notes
The PIC18F65J94T-I/MR 64-QFN package has a center exposed pad (EP) that serves as the primary thermal and electrical ground return. Solder the EP to a PCB pad that is connected to the digital ground plane via a stitched thermal via array - typically 9 to 25 thermal vias in a 3x3 to 5x5 grid - to keep junction temperature below 85C during sustained USB enumeration and high-throughput streaming. Without proper EP soldering, the device derates significantly at higher ambient temperatures. Estimated: at 64 MHz, 3.3 V core, and full USB activity, continuous current is roughly 25-30 mA from VDD, requiring the EP for heat dissipation.
For USB 2.0 full-speed signal integrity, route the D+ and D- lines as a 90-ohm differential pair with controlled impedance, keeping length matching within 150 mils and avoiding vias or sharp bends. Place the 0.1 uF ceramic decoupling capacitor as close as possible to the VDD pin and a 4.7 uF bulk capacitor on VUSB. Per the USB 2.0 specification, keep the D+/D- trace length under 50 mm to minimize reflections, and isolate the USB bus from noisy switching nodes such as LCD charge pumps. The exposed pad connects to ground with stitched vias placed in a grid pattern under the package.
Do not tie the MCLR pin directly to VDD without a pull-up; the PIC18F65J94T-I/MR datasheet recommends a 10 kohm pull-up to VDD plus a 100 nF cap to ground for proper reset behavior. Avoid using port pins RB0/RB1/RB2/RB3 for digital I/O when the segmented LCD is enabled, because they share pins with SEG0-SEG3 - the LCD controller takes precedence. The internal 2.5 V core regulator requires a minimum 4.7 uF low-ESR capacitor on VDDCORE to avoid core undervoltage lockout during USB suspend/resume transitions. Per Microchip datasheet guidance, also ensure VDDCORE startup time does not exceed the configured PLL lock window.
The PIC18F65J94T-I/MR supports both 2.5 V and 3.3 V VDD operation, but the internal voltage regulator generates the core supply on-chip from the VDD pin. For USB applications, VDD must be 3.3 V (not 2.5 V) to meet USB signalling levels on D+ and D-. Use a low-dropout regulator such as Microchip MCP1700 or similar upstream of VDD, sized for 100 mA peak to support USB inrush. Add a 1 uF + 100 nF bypass network on VDD and a 4.7 uF bulk on VUSB. Battery-powered designs should enable the nanoWatt XLP deep-sleep mode to keep quiescent current below the USB suspend-current threshold of 2.5 mA.
Keep the LCD segment traces routed away from the USB differential pair and from any high-frequency oscillator traces, as capacitive coupling can introduce segment flicker and degrade USB signal integrity. Place the crystal or external oscillator traces (OSC1/OSC2) within 5 mm of the chip and shield them with a grounded guard trace. For high-segment LCD designs, use a star-ground topology connecting the EP ground, digital VSS, and analog AVSS only at a single point near the EP. Use 4-layer PCB stack-up with a dedicated ground plane on layer 2 and a power plane on layer 3 to minimize EMI and improve USB compliance.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - this is a commercial/industrial grade part. For automotive applications a different Microchip part with the -E (extended) suffix and AEC-Q100 qualification is required.
