PIC18F8390T-I/PT - 8KB Flash 8-bit MCU with LCD Driver | Microchip
MPN: PIC18F8390T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.85 | $6.85 |
| 10 | $6.12 | $61.20 |
| 100 | $5.4 | $540.00 |
| 500 | $4.78 | $2,390.00 |
| 1,000 | $4.2 | $4,200.00 |
PIC18F8390T-I/PT Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory and peripherals onto one silicon die. Within the broader taxonomy, the PIC18F family sits in Microchip's high-performance 8-bit line, above the baseline PIC10/12/16 families, and is positioned alongside 16-bit PIC24 and dsPIC devices as well as 32-bit ARM Cortex-M parts in the wider microcontroller market. This product's specific role is as a low-power, peripheral-rich node for human-machine interface applications.
Key features include an integrated LCD driver capable of multiplexing up to 192 segments, nanoWatt power management for ultra-low standby current, and 70 I/O pins for external interfacing. The device supports 16-bit wide data bus architecture and offers up to 10 MIPS throughput at 40 MHz, providing substantial headroom for control loops and UI rendering. It includes multiple communication peripherals (I2C, SPI, USART) plus 12-bit ADC channels for sensor acquisition.
The PIC18F8390 uses a modified Harvard architecture with a 16-bit instruction word and 8-bit data path, optimized for C compiler efficiency and deterministic interrupt handling. The integrated LCD driver eliminates the need for an external display controller chip, reducing BOM cost and PCB area in meter and panel designs.
Typical applications include handheld meters, thermostats, home security panels, and power/gas/water metering products where segment LCDs and low standby current are critical. The wide I/O count also suits industrial control panels and medical dosing devices requiring multiple buttons and indicator LEDs.
When designing with this device, ensure the LCD bias network matches the expected number of segments and multiplexing level to achieve optimal contrast. Use the nanoWatt sleep modes during idle periods to extend battery life in portable meters. Pins assigned to analog functions must be configured correctly to avoid parasitic current draw.
This page synthesizes distributor availability, drop-in PIC18 family alternatives, and practical design notes not found in the bare datasheet, giving engineers a one-stop reference for design-in and sourcing decisions.
Drop-in alternatives for PIC18F8390T-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 PIC18F8390T-I/PT (same form factor and footprint) — differing in Package, ADC, Operating Temperature, Core Architecture, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F8390-I/PT
✅ Drop-In✓ In Stock
$6.21 / Unit
View Datasheet →PIC18F8490-I/PT
✅ Drop-In✓ In Stock
$5.55 / Unit
View Datasheet →PIC18F8590-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F67J90-I/PT
✅ Drop-In✓ In Stock
$5.64 / Unit
View Datasheet →PIC18F67K90-I/PT
✅ Drop-In✓ In Stock
$7.55 / Unit
View Datasheet →PIC18F65K90T-I/MRRSL
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →PIC18F8390T-I/PT Maximum Ratings & Electrical Characteristics
| Architecture | 8-bit PIC18 RISC (modified Harvard) |
| Program Memory (Flash) | 8 KB |
| Data RAM | 768 bytes |
| Maximum Clock Frequency | 40 MHz |
| Performance | 10 MIPS |
| Supply Voltage | 4.2 V to 5.5 V |
| I/O Pins | 70 |
| Data Bus Width | 16-bit (instruction word) |
| LCD Driver | Integrated, up to 192 segments |
| ADC | 12-bit, multi-channel |
| Communication Peripherals | I2C, SPI, USART (Enhanced) |
| Power-Saving Technology | nanoWatt (multiple idle/sleep modes) |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | TQFP-80 (PT), 12 x 12 mm, 1 mm height |
| Mounting Type | Surface Mount |
| Lead-Free / RoHS | Per Microchip product page |
PIC18F8390T-I/PT tqfp-80 (pt), 12 x 12 mm, 1 mm height Pin Configuration Guide
Pin configuration for PIC18F8390T-I/PT (tqfp-80 (pt), 12 x 12 mm, 1 mm height package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for PIC18F8390T-I/PT.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC18F8390T-I/PT is suitable for 6 applications: Handheld Utility Meters, Thermostat Control Panels, Home Security Panels, Industrial Operator Panels, Medical Infusion Pumps, Automotive Dashboard Sub-Displays.
Handheld Utility Meters
The PIC18F8390T-I/PT is well matched to handheld utility meters thanks to its integrated LCD driver for 192 segments and 8 KB Flash for metering algorithms. The nanoWatt sleep modes drop standby current into the microampere range, extending battery life in portable water, gas or electric meters. The 70 I/O lines accommodate pulse inputs from flow sensors, optical encoder interfaces, and tamper-detection switches without an external I/O expander.
Recommended
Thermostat Control Panels
The PIC18F8390T-I/PT fits wall-mount thermostat panels because the integrated LCD driver drives multi-digit temperature, humidity, and status displays without an external controller. The 12-bit ADC captures thermistor or analog sensor inputs, while the 70 I/O pins manage keypad scanning, relay drivers and backlight PWM. The 40 MHz core provides ample headroom for PID loops driving HVAC actuators and Compressor timing.
Recommended
Home Security Panels
The PIC18F8390T-I/PT serves home security panels by combining its 70 I/O pins for zone monitoring, integrated LCD for status display, and USART for cellular or RF module connectivity. The 8 KB Flash accommodates event-logging firmware and keypad debouncing, while nanoWatt sleep maintains a multi-year backup-battery life during mains outages. The industrial temperature grade supports garage and unconditioned-space installations.
Recommended
Industrial Operator Panels
The PIC18F8390T-I/PT drives industrial operator panels where a segment LCD displays machine status, counts, and alarms. The 70 I/O lines handle push-button matrices, encoder feedback and digital outputs to PLCs, while the 12-bit ADC monitors analog sensors such as pressure or temperature transducers. The wide 4.2 V to 5.5 V supply range tolerates noisy 24 V industrial rails after regulation.
Recommended
Medical Infusion Pumps
The PIC18F8390T-I/PT supports portable medical infusion pumps where its LCD driver shows dosage and battery status, the 12-bit ADC reads flow-rate sensors, and the USART links to wireless nurse-call modules. The nanoWatt sleep extends battery life between charges, while the 8 KB Flash implements safety interlocks and audible alarm sequencing. Industrial temperature grade ensures reliable operation in clinical environments.
Recommended
Automotive Dashboard Sub-Displays
The PIC18F8390T-I/PT powers secondary automotive dashboard sub-displays such as trip computers, gear position indicators, or maintenance reminders using the integrated LCD driver. CAN or LIN connectivity is available through the USART, while the 70 I/O pins drive segmented indicator lamps and button backlighting. The 40 MHz throughput renders multi-digit mileage and timer updates smoothly without flicker.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F8390T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F8390-I/PT | PIC18F8490-I/PT | PIC18F8590-I/PT | PIC18F67J90-I/PT | PIC18F67K90-I/PT | PIC18F65K90T-I/MRRSL |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-80 (PT) | TQFP-80 (PT) - same | TQFP-80 (PT) - same | TQFP-80 (PT) - same | TQFP-80 (PT) - same | TQFP-80 (PT) - same | TQFP-80 (PT) - same |
| Flash Memory | 8 KB | 8 KB | 16 KB | 48 KB | 64 KB | 64 KB | 32 KB |
| RAM | 768 bytes | 768 bytes | 1.5 KB | 3.5 KB | 3.9 KB | 3.9 KB | 2 KB |
| Maximum Clock | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 64 MHz | 64 MHz |
| Supply Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 3.6 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| I/O Pins | 70 | 70 | 70 | 70 | 67 | 67 | 67 |
| LCD Driver | Yes, 192 segments | Yes, 192 segments | Yes, 192 segments | Yes, 192 segments | Yes | Yes | Yes |
| Temperature Grade | Industrial (-40C to +85C) | Industrial | Industrial | Industrial | Industrial | Industrial | Industrial |
| Approx Unit Price (USD, qty 1) | 6.85 | 6.85 | 7.50 | 8.90 | 7.10 | 6.95 | 7.20 |
Key Differentiators
- Integrated LCD driver for 192 segments at 5 V (vs PIC18F67K90-I/PT)
- Largest memory in 80-pin TQFP family at this position (vs PIC18F8390-I/PT)
- Same package as higher-memory PIC18F8490/8590 (vs PIC18F8490-I/PT)
Design Notes
The PIC18F8390T-I/PT operates from 4.2 V to 5.5 V; supply noise above 50 mVpp can couple into the LCD charge pump and degrade segment contrast. Decouple VDD with a 100 nF ceramic plus 10 uF bulk capacitor within 5 mm of the supply pins. For battery-backed metering, switch to nanoWatt sleep mode (IDLE or SLEEP) during idle windows to drop current below 100 nA typical, and use the on-chip low-power Timer1 oscillator (32 kHz) for RTC wake-up.
Route the LCD segment and common lines as parallel traces with consistent spacing to maintain balanced capacitance across the glass. Place the bias resistors and capacitors (typically 100 kohm and 0.1 uF) close to the VLCD pin. Avoid routing digital signals under the LCD connector area to prevent ghosting. Use a guard trace tied to VSS around high-impedance analog inputs to reduce leakage and crosstalk.
Do not configure pins as analog inputs by default - they default to digital on reset and must be explicitly set to analog via ANSEL registers to avoid parasitic current draw from floating digital inputs. Always set the oscillator configuration bits (CONFIG1H) before enabling the PLL or switching to HS mode. The ICSP/ICD pins (RB6/RB7) must be left unused or pulled in a way that does not interfere with in-circuit programming or debugging.
Compliance Information
Lead-free matte-tin finish per Microchip product page; PT suffix TQFP is RoHS compliant. Industrial temperature grade only; not AEC-Q100 qualified for automotive - choose PIC18F66K80 family for AEC-Q100 applications.
