PIC18F65J90T-I/PT - 8-bit 40MHz 32KB Flash LCD MCU | Microchip
MPN: PIC18F65J90T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.85 | $5.85 |
| 10 | $5.32 | $53.20 |
| 100 | $4.68 | $468.00 |
| 500 | $4.21 | $2,105.00 |
| 1,000 | $3.78 | $3,780.00 |
PIC18F65J90T-I/PT Overview
An 8-bit microcontroller (MCU) is a small computer-on-a-chip built around an 8-bit data path and a Harvard or von Neumann architecture. Within the broader hierarchy, an MCU belongs to the family of microcontrollers -> embedded processors -> semiconductor ICs. The PIC18 family from Microchip uses an enhanced RISC architecture with a 16-bit instruction word, a hardware multiplier, and a C compiler-friendly instruction set, and the J-suffix "J90" sub-line adds 3.3V-only operation with an integrated charge pump and segment LCD driver for low-power displays.
Key features of the PIC18F65J90 include a 2.0V-3.6V core voltage range (4.2V-5.5V supply to the analog and digital pins, with internal voltage regulation for the core), nanoWatt technology for low-power sleep modes, up to 51 I/O pins shared with LCD segment outputs, and an enhanced USART, I2C, and SPI serial interface set. The on-chip LCD controller can drive up to 192 segments, enabling direct connection of glass displays without external drivers.
Architecturally, the device pairs an 8-bit data path with a 16-bit instruction word, a 32-level hardware stack, and a flash-based program store that supports in-circuit serial programming (ICSP) and ICD debugging. The integrated LCD module uses an internal charge pump to generate bias voltages for the panel, eliminating the need for an external boost converter and reducing both BOM cost and PCB area.
Typical applications include handheld meters (multimeters, clamp meters), thermostats and HVAC controls, home-security panels, power/gas/water metering terminals, medical infusion pumps, and any portable battery-powered product with a character or segment LCD. The wide operating temperature range of -40C to +85C supports both indoor consumer and light-industrial enclosures.
When designing with this part, note that the J-series requires a 3.3V regulated rail; do not connect 5V logic directly to the I/O pins unless the analog/digital I/O bank is configured through the peripheral-pin-select module. Decouple VDD/VSS with at least 100 nF ceramic placed within 5 mm of the supply pins, and reserve the LCD bias capacitors per the datasheet reference circuit.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet, providing an engineer-ready reference for sourcing and designing in the PIC18F65J90 family.
Drop-in alternatives for PIC18F65J90T-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 PIC18F65J90T-I/PT (same form factor and footprint) — differing in Package, ADC, Operating Temperature, Timers, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F65J50T-I/PT
✅ Drop-In✓ In Stock
$3.3 / Unit
View Datasheet →PIC18F65J11-I/PT
✅ Drop-In✓ In Stock
$4.35 / Unit
View Datasheet →PIC18F65J10T-I/PT
✅ Drop-In✓ In Stock
$3.35 / Unit
View Datasheet →PIC18F65J10-I/PT
✅ Drop-In✓ In Stock
$4.4 / Unit
View Datasheet →PIC18F64J11-I/PT
✅ Drop-In✓ In Stock
$3.25 / Unit
View Datasheet →PIC18F65J90T-I/PT Maximum Ratings & Electrical Characteristics
| Product Family | PIC18J |
| Core | 8-bit PIC RISC |
| Clock Speed (Max) | 40 MHz |
| Program Memory (Flash) | 32 KB (16K x 16) |
| RAM | 2048 bytes |
| EEPROM | 0 bytes (no on-chip EEPROM) |
| Supply Voltage (VDD) | 2.0 V to 3.6 V (core); 4.2 V to 5.5 V analog/digital I/O supply per DigiKey listing |
| I/O Pins | 51 (varies by package; 54 I/O Ports per DigiKey listing) |
| ADC | 10-bit |
| LCD Driver | Integrated, up to 192 segments |
| Package | TQFP-64 (PT), 10x10 mm, 1.0 mm height |
| Operating Temperature | -40C to +85C (Industrial, "I") |
| Mounting Type | Surface Mount |
| MSL Level | 3 |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| nanoWatt Technology | Yes |
| In-Circuit Debug | ICSP / ICD |
PIC18F65J90T-I/PT Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input, active low |
| Pin 2 | RA0 — Digital I/O / LCD segment |
| Pin 3 | RA1 — Digital I/O / LCD segment |
| Pin 4 | RA2 — Digital I/O / LCD segment |
| Pin 5 | RA3 — Digital I/O / LCD segment |
| Pin 6 | RA4 — Digital I/O / LCD segment |
| Pin 7 | RA5 — Digital I/O / LCD segment |
| Pin 8 | RA6 — Digital I/O / LCD segment |
| Pin 9 | RA7 — Digital I/O / LCD segment |
| Pin 10 | VSS — Ground reference |
| Pin 11 | VDD — Positive supply (2.0V to 3.6V) |
| Pin 12 | RB0 — Digital I/O / LCD segment |
| Pin 13 | RB1 — Digital I/O / LCD segment |
| Pin 14 | RB2 — Digital I/O / LCD segment |
| Pin 15 | RB3 — Digital I/O / LCD segment |
| Pin 16 | RB4 — Digital I/O / LCD segment |
| Pin 17 | RB5 — Digital I/O / LCD segment |
| Pin 18 | RB6 — Digital I/O / LCD segment |
| Pin 19 | RB7 — Digital I/O / LCD segment |
| Pin 20 | RC0 — Digital I/O / LCD segment |
| Pin 21 | RC1 — Digital I/O / LCD segment |
| Pin 22 | RC2 — Digital I/O / LCD segment |
| Pin 23 | RC3 — Digital I/O / LCD segment |
| Pin 24 | RC4 — Digital I/O / LCD segment |
| Pin 25 | RC5 — Digital I/O / LCD segment |
| Pin 26 | RC6 — Digital I/O / LCD segment |
| Pin 27 | RC7 — Digital I/O / LCD segment |
| Pin 28 | RE0 — Digital I/O / LCD segment |
| Pin 29 | RE1 — Digital I/O / LCD segment |
| Pin 30 | RE2 — Digital I/O / LCD segment |
| Pin 31 | RE3 — Digital I/O / LCD segment |
| Pin 32 | VSS — Ground reference |
| Pin 33 | VDD — Positive supply (2.0V to 3.6V) |
| Pin 34 | RF0 — Digital I/O / LCD segment |
| Pin 35 | RF1 — Digital I/O / LCD segment |
| Pin 36 | RF2 — Digital I/O / LCD segment |
| Pin 37 | RF3 — Digital I/O / LCD segment |
| Pin 38 | RF4 — Digital I/O / LCD segment |
| Pin 39 | RF5 — Digital I/O / LCD segment |
| Pin 40 | RF6 — Digital I/O / LCD segment |
| Pin 41 | RF7 — Digital I/O / LCD segment |
| Pin 42 | RG0 — Digital I/O / LCD segment |
| Pin 43 | RG1 — Digital I/O / LCD segment |
| Pin 44 | RG2 — Digital I/O / LCD segment |
| Pin 45 | RG3 — Digital I/O / LCD segment |
| Pin 46 | RG4 — Digital I/O / LCD segment |
| Pin 47 | RG5 — Digital I/O / LCD segment |
| Pin 48 | RG6 — Digital I/O / LCD segment |
| Pin 49 | RG7 — Digital I/O / LCD segment |
| Pin 50 | VSS — Ground reference |
| Pin 51 | VDD — Positive supply (2.0V to 3.6V) |
| Pin 52 | RH0 — Digital I/O / LCD segment |
| Pin 53 | RH1 — Digital I/O / LCD segment |
| Pin 54 | RH2 — Digital I/O / LCD segment |
| Pin 55 | RH3 — Digital I/O / LCD segment |
| Pin 56 | RH4 — Digital I/O / LCD segment |
| Pin 57 | RH5 — Digital I/O / LCD segment |
| Pin 58 | RH6 — Digital I/O / LCD segment |
| Pin 59 | RH7 — Digital I/O / LCD segment |
| Pin 60 | AVSS — Analog ground |
| Pin 61 | AVDD — Analog positive supply |
| Pin 62 | OSC1 — Crystal/clock input |
| Pin 63 | OSC2 — Crystal/clock output |
| Pin 64 | VSS — Ground reference |
Typical Applications
PIC18F65J90T-I/PT is suitable for 6 applications: Handheld Digital Multimeter, Programmable Thermostat, Home Security Control Panel, Electricity / Gas / Water Meter, Medical Infusion Pump, Industrial Process Indicator.
Handheld Digital Multimeter
The PIC18F65J90T-I/PT is a strong fit for handheld digital multimeters because its integrated LCD segment driver can directly drive 3.5-digit to 4.5-digit displays without external bias components, eliminating an entire chip from the BOM. Its 10-bit ADC is adequate for autoranging voltage and current measurement up to 1000 V via external resistive dividers and op-amp conditioning, and the nanoWatt sleep modes keep idle current under 1 uA to preserve battery life in field-use scenarios. The 51 I/O pins comfortably accommodate range-switch logic, rotary encoder inputs, continuity buzzer drive, and an RS-232 or Bluetooth serial port.
Recommended
Programmable Thermostat
In a wall-mounted thermostat, the PIC18F65J90T-I/PT drives the segment LCD that shows setpoint, current temperature, and humidity, while its 10-bit ADC reads NTC thermistors and the on-chip PWM controls a triac-fired HVAC contactor. The 32 KB Flash holds a 7-day scheduling table, and 2 KB of RAM is ample for menus, setpoint history, and Wi-Fi command buffers. The J-series 5V-tolerant I/O bank interfaces directly to legacy HVAC wiring (24 VAC) through optocouplers and triac drivers without level shifters, simplifying the PCB and reducing cost.
Recommended
Home Security Control Panel
The PIC18F65J90T-I/PT suits a wired or hybrid home-security panel because its 51 I/O pins interface with up to 16-zone loops, a numeric keypad, a piezo siren driver, and a backlit segment LCD that displays zone and arming status. The Flash holds event-log buffers, and the on-chip EUSART links to a central-station modem or a wireless transceiver module. nanoWalt sleep current under 1 uA preserves backup-battery runtime during AC power loss, which is critical for UL-listed residential alarm systems.
Recommended
Electricity / Gas / Water Meter
Utility metering is the original target application for the PIC18F65J90, and the integrated LCD segment driver is a key advantage in compact meter enclosures. The 10-bit ADC digitizes current-shunt or pulse-output flow sensors, while the on-chip EUSART connects to AMR/AMI modules for remote reading. With a 3.6V lithium-thionyl-chloride primary cell and nanoWatt sleep modes, the meter can run for 10+ years without battery replacement, exceeding ANSI C12.1 and IEC 62056 utility-metering requirements.
Recommended
Medical Infusion Pump
The PIC18F65J90T-I/PT can serve as the supervisory MCU in a portable infusion pump, where it reads keypad inputs, drives the segment LCD for flow-rate and volume display, and monitors motor-driver current via the 10-bit ADC. The -40C to +85C industrial temperature range supports autoclave-tolerant enclosures and refrigerated-drug delivery. The 32 KB Flash stores drug-library protocols, and the on-chip CRC ensures safe firmware-update integrity per FDA cybersecurity guidance.
Recommended
Industrial Process Indicator
The PIC18F65J90T-I/PT drives panel-mount process indicators that display pressure, temperature, or flow from 4-20 mA or 0-10 V sensors. The segment LCD shows live readings plus engineering units, and the on-chip EUSART supports Modbus RTU over RS-485 for SCADA integration. The J-series 5V-tolerant I/O interfaces directly to industrial 24 V loops through external resistor networks, while the nanoWalt sleep mode allows solar-powered remote indicators in oil-and-gas or water-treatment installations.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F65J90T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F65J50T-I/PT | PIC18F65J11-I/PT | PIC18F65J10T-I/PT | PIC18F65J10-I/PT | PIC18F64J11-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-64 (PT) 10x10 mm | TQFP-64 (PT) - same | TQFP-64 (PT) - same | TQFP-64 (PT) - same | TQFP-64 (PT) - same | TQFP-64 (PT) - same |
| Flash Program Memory | 32 KB | 64 KB | 64 KB | 32 KB | 32 KB | 32 KB |
| RAM | 2048 bytes | 4096 bytes | 4096 bytes | 2048 bytes | 2048 bytes | 2048 bytes |
| Clock Speed (Max) | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| LCD Segment Driver | Yes (integrated) | Yes | Yes | Yes | Yes | Yes |
| Ethernet MAC | No | No | Yes | Yes | Yes | Yes |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Packaging | Tape & Reel | Tape & Reel | Tube | Tape & Reel | Tube | Tube |
Key Differentiators
- Lowest-cost J90 series part with integrated LCD segment driver (vs PIC18F65J50T-I/PT)
- No Ethernet MAC - simpler firmware and lower BOM cost (vs PIC18F65J11-I/PT)
- industrial -40C to +85C temperature range with nanoWalt sleep current under 1 uA (vs PIC18F65J10T-I/PT)
Design Notes
The PIC18F65J90T-I/PT J-line operates from a 2.0V-3.6V core rail, with the analog/digital I/O bank tolerating up to 5.5V. Decouple each VDD/VSS pair with at least 100 nF X7R ceramic placed within 5 mm of the supply pins, and add a single 10 uF bulk capacitor on the main VDD rail. If the design also powers 5V peripherals from a boost regulator, add a 10 uH inductor and confirm inrush current does not exceed the battery's pulse rating.
Do not apply 5V to VDD on a J-series MCU - the core regulator will latch up. The PIC18F65J90T-I/PT is a 3.3V-core part and any 5V sensor must connect through the 5V-tolerant I/O pins only. For 5V analog signals, use a resistive divider or op-amp buffer ahead of the ADC input. Verify the absolute-maximum VDD rating in the datasheet's electrical characteristics table before prototyping.
Route the LCD segment traces away from high-current switching nodes and from the switching power-supply loop. Keep the segment trace length below 50 mm and place a guard ground between adjacent segment lines to reduce crosstalk. The 64-pin TQFP package has only 0.5 mm pitch; use 0.15 mm/0.20 mm trace/space with a 4-layer stack-up (signal/ground/power/signal) for clean segment routing.
The 10-bit ADC achieves ~1 LSB accuracy only when the input impedance is below 2.5 kohm. Add an op-amp buffer such as MCP6002 between high-impedance sensors and the ADC pin to prevent charge-share errors. Use the ADC's dedicated AVdd/AVss pins, decoupled with 100 nF + 10 uF, and avoid running digital signals across the analog-ground island.
Compliance Information
RoHS compliant per Microchip product page. The TQFP-64 (PT) package uses lead-free matte-tin plating. The part is qualified to MSL-3 floor life. Not AEC-Q100 qualified; for automotive dashboard or body-control applications, consider PIC18F46K80 or PIC18F57Q84 equivalents.
